diff --git a/adb/Android.bp b/adb/Android.bp
index 9db151d..dcd2648 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -124,11 +124,12 @@
         "libadbd_core",
         "libadbconnection_server",
         "libasyncio",
+        "libbase",
         "libbrotli",
         "libcutils_sockets",
         "libdiagnose_usb",
         "libmdnssd",
-        "libbase",
+        "libzstd",
 
         "libadb_protos",
         "libapp_processes_protos_lite",
@@ -351,6 +352,7 @@
         "liblog",
         "libziparchive",
         "libz",
+        "libzstd",
     ],
 
     // Don't add anything here, we don't want additional shared dependencies
@@ -483,6 +485,7 @@
         "libbrotli",
         "libdiagnose_usb",
         "liblz4",
+        "libzstd",
     ],
 
     shared_libs: [
@@ -586,6 +589,7 @@
         "libdiagnose_usb",
         "liblz4",
         "libmdnssd",
+        "libzstd",
     ],
 
     visibility: [
@@ -636,16 +640,14 @@
             ],
         }
     },
-
-    required: [
-        "libadbd_auth",
-        "libadbd_fs",
-    ],
 }
 
 phony {
-    name: "adbd_system_binaries",
+    // Interface between adbd in a module and the system.
+    name: "adbd_system_api",
     required: [
+        "libadbd_auth",
+        "libadbd_fs",
         "abb",
         "reboot",
         "set-verity-state",
@@ -653,8 +655,10 @@
 }
 
 phony {
-    name: "adbd_system_binaries_recovery",
+    name: "adbd_system_api_recovery",
     required: [
+        "libadbd_auth",
+        "libadbd_fs",
         "reboot.recovery",
     ],
 }
diff --git a/adb/client/commandline.cpp b/adb/client/commandline.cpp
index eaa32e5..43772ba 100644
--- a/adb/client/commandline.cpp
+++ b/adb/client/commandline.cpp
@@ -1336,6 +1336,8 @@
         return CompressionType::Brotli;
     } else if (str == "lz4") {
         return CompressionType::LZ4;
+    } else if (str == "zstd") {
+        return CompressionType::Zstd;
     }
 
     error_exit("unexpected compression type %s", str.c_str());
diff --git a/adb/client/file_sync_client.cpp b/adb/client/file_sync_client.cpp
index 7185939..8bbe2a8 100644
--- a/adb/client/file_sync_client.cpp
+++ b/adb/client/file_sync_client.cpp
@@ -240,6 +240,7 @@
             have_sendrecv_v2_ = CanUseFeature(*features, kFeatureSendRecv2);
             have_sendrecv_v2_brotli_ = CanUseFeature(*features, kFeatureSendRecv2Brotli);
             have_sendrecv_v2_lz4_ = CanUseFeature(*features, kFeatureSendRecv2LZ4);
+            have_sendrecv_v2_zstd_ = CanUseFeature(*features, kFeatureSendRecv2Zstd);
             have_sendrecv_v2_dry_run_send_ = CanUseFeature(*features, kFeatureSendRecv2DryRunSend);
             std::string error;
             fd.reset(adb_connect("sync:", &error));
@@ -268,13 +269,16 @@
     bool HaveSendRecv2() const { return have_sendrecv_v2_; }
     bool HaveSendRecv2Brotli() const { return have_sendrecv_v2_brotli_; }
     bool HaveSendRecv2LZ4() const { return have_sendrecv_v2_lz4_; }
+    bool HaveSendRecv2Zstd() const { return have_sendrecv_v2_zstd_; }
     bool HaveSendRecv2DryRunSend() const { return have_sendrecv_v2_dry_run_send_; }
 
     // Resolve a compression type which might be CompressionType::Any to a specific compression
     // algorithm.
     CompressionType ResolveCompressionType(CompressionType compression) const {
         if (compression == CompressionType::Any) {
-            if (HaveSendRecv2LZ4()) {
+            if (HaveSendRecv2Zstd()) {
+                return CompressionType::Zstd;
+            } else if (HaveSendRecv2LZ4()) {
                 return CompressionType::LZ4;
             } else if (HaveSendRecv2Brotli()) {
                 return CompressionType::Brotli;
@@ -374,6 +378,10 @@
                 msg.send_v2_setup.flags = kSyncFlagLZ4;
                 break;
 
+            case CompressionType::Zstd:
+                msg.send_v2_setup.flags = kSyncFlagZstd;
+                break;
+
             case CompressionType::Any:
                 LOG(FATAL) << "unexpected CompressionType::Any";
         }
@@ -421,6 +429,10 @@
                 msg.recv_v2_setup.flags |= kSyncFlagLZ4;
                 break;
 
+            case CompressionType::Zstd:
+                msg.recv_v2_setup.flags |= kSyncFlagZstd;
+                break;
+
             case CompressionType::Any:
                 LOG(FATAL) << "unexpected CompressionType::Any";
         }
@@ -631,7 +643,8 @@
         syncsendbuf sbuf;
         sbuf.id = ID_DATA;
 
-        std::variant<std::monostate, NullEncoder, BrotliEncoder, LZ4Encoder> encoder_storage;
+        std::variant<std::monostate, NullEncoder, BrotliEncoder, LZ4Encoder, ZstdEncoder>
+                encoder_storage;
         Encoder* encoder = nullptr;
         switch (compression) {
             case CompressionType::None:
@@ -646,6 +659,10 @@
                 encoder = &encoder_storage.emplace<LZ4Encoder>(SYNC_DATA_MAX);
                 break;
 
+            case CompressionType::Zstd:
+                encoder = &encoder_storage.emplace<ZstdEncoder>(SYNC_DATA_MAX);
+                break;
+
             case CompressionType::Any:
                 LOG(FATAL) << "unexpected CompressionType::Any";
         }
@@ -928,6 +945,7 @@
     bool have_sendrecv_v2_;
     bool have_sendrecv_v2_brotli_;
     bool have_sendrecv_v2_lz4_;
+    bool have_sendrecv_v2_zstd_;
     bool have_sendrecv_v2_dry_run_send_;
 
     TransferLedger global_ledger_;
@@ -1133,7 +1151,8 @@
     uint64_t bytes_copied = 0;
 
     Block buffer(SYNC_DATA_MAX);
-    std::variant<std::monostate, NullDecoder, BrotliDecoder, LZ4Decoder> decoder_storage;
+    std::variant<std::monostate, NullDecoder, BrotliDecoder, LZ4Decoder, ZstdDecoder>
+            decoder_storage;
     Decoder* decoder = nullptr;
 
     std::span buffer_span(buffer.data(), buffer.size());
@@ -1150,6 +1169,10 @@
             decoder = &decoder_storage.emplace<LZ4Decoder>(buffer_span);
             break;
 
+        case CompressionType::Zstd:
+            decoder = &decoder_storage.emplace<ZstdDecoder>(buffer_span);
+            break;
+
         case CompressionType::Any:
             LOG(FATAL) << "unexpected CompressionType::Any";
     }
diff --git a/adb/client/incremental.cpp b/adb/client/incremental.cpp
index a8b0ab3..3033059 100644
--- a/adb/client/incremental.cpp
+++ b/adb/client/incremental.cpp
@@ -42,7 +42,7 @@
     struct stat st;
     if (stat(signature_file.c_str(), &st)) {
         if (!silent) {
-            fprintf(stderr, "Failed to stat signature file %s. Abort.\n", signature_file.c_str());
+            fprintf(stderr, "Failed to stat signature file %s.\n", signature_file.c_str());
         }
         return {};
     }
@@ -50,11 +50,21 @@
     unique_fd fd(adb_open(signature_file.c_str(), O_RDONLY));
     if (fd < 0) {
         if (!silent) {
-            fprintf(stderr, "Failed to open signature file: %s. Abort.\n", signature_file.c_str());
+            fprintf(stderr, "Failed to open signature file: %s.\n", signature_file.c_str());
         }
         return {};
     }
 
+    std::vector<char> invalid_signature;
+
+    if (st.st_size > kMaxSignatureSize) {
+        if (!silent) {
+            fprintf(stderr, "Signature is too long. Max allowed is %d. Abort.\n",
+                    kMaxSignatureSize);
+        }
+        return {std::move(fd), std::move(invalid_signature)};
+    }
+
     auto [signature, tree_size] = read_id_sig_headers(fd);
     if (auto expected = verity_tree_size_for_file(file_size); tree_size != expected) {
         if (!silent) {
@@ -62,7 +72,7 @@
                     "Verity tree size mismatch in signature file: %s [was %lld, expected %lld].\n",
                     signature_file.c_str(), (long long)tree_size, (long long)expected);
         }
-        return {};
+        return {std::move(fd), std::move(invalid_signature)};
     }
 
     return {std::move(fd), std::move(signature)};
@@ -72,9 +82,11 @@
 static std::pair<unique_fd, std::string> read_and_encode_signature(Size file_size,
                                                                    std::string signature_file,
                                                                    bool silent) {
+    std::string encoded_signature;
+
     auto [fd, signature] = read_signature(file_size, std::move(signature_file), silent);
-    if (!fd.ok()) {
-        return {};
+    if (!fd.ok() || signature.empty()) {
+        return {std::move(fd), std::move(encoded_signature)};
     }
 
     size_t base64_len = 0;
@@ -82,9 +94,10 @@
         if (!silent) {
             fprintf(stderr, "Fail to estimate base64 encoded length. Abort.\n");
         }
-        return {};
+        return {std::move(fd), std::move(encoded_signature)};
     }
-    std::string encoded_signature(base64_len, '\0');
+
+    encoded_signature.resize(base64_len, '\0');
     encoded_signature.resize(EVP_EncodeBlock((uint8_t*)encoded_signature.data(),
                                              (const uint8_t*)signature.data(), signature.size()));
 
@@ -109,7 +122,7 @@
         }
 
         auto [signature_fd, signature] = read_and_encode_signature(st.st_size, file, silent);
-        if (!signature_fd.ok()) {
+        if (signature_fd.ok() && signature.empty()) {
             return {};
         }
 
@@ -138,9 +151,12 @@
             return false;
         }
 
-        auto [fd, _] = read_signature(st.st_size, file, true);
-        if (!fd.ok()) {
-            return false;
+        if (android::base::EndsWithIgnoreCase(file, ".apk")) {
+            // Signature has to be present for APKs.
+            auto [fd, _] = read_signature(st.st_size, file, /*silent=*/true);
+            if (!fd.ok()) {
+                return false;
+            }
         }
     }
     return true;
@@ -164,7 +180,7 @@
     int print_fds[2];
     if (adb_socketpair(print_fds) != 0) {
         if (!silent) {
-            fprintf(stderr, "Failed to create socket pair for child to print to parent\n");
+            fprintf(stderr, "adb: failed to create socket pair for child to print to parent\n");
         }
         return {};
     }
@@ -191,10 +207,15 @@
     Result result = wait_for_installation(pipe_read_fd);
     adb_close(pipe_read_fd);
 
-    if (result == Result::Success) {
-        // adb client exits now but inc-server can continue
-        serverKiller.release();
+    if (result != Result::Success) {
+        if (!silent) {
+            fprintf(stderr, "adb: install command failed");
+        }
+        return {};
     }
+
+    // adb client exits now but inc-server can continue
+    serverKiller.release();
     return child;
 }
 
diff --git a/adb/client/incremental_server.cpp b/adb/client/incremental_server.cpp
index bfe18c0..0654a11 100644
--- a/adb/client/incremental_server.cpp
+++ b/adb/client/incremental_server.cpp
@@ -171,6 +171,8 @@
 
     const std::vector<BlockIdx>& PriorityBlocks() const { return priority_blocks_; }
 
+    bool hasTree() const { return tree_fd_.ok(); }
+
     std::vector<bool> sentBlocks;
     NumBlocks sentBlocksCount = 0;
 
@@ -349,6 +351,9 @@
 
 bool IncrementalServer::SendTreeBlocksForDataBlock(const FileId fileId, const BlockIdx blockIdx) {
     auto& file = files_[fileId];
+    if (!file.hasTree()) {
+        return true;
+    }
     const int32_t data_block_count = numBytesToNumBlocks(file.size);
 
     const int32_t total_nodes_count(file.sentTreeBlocks.size());
@@ -670,7 +675,8 @@
 
     unique_fd fd(adb_open(signature_file.c_str(), O_RDONLY));
     if (fd < 0) {
-        error_exit("inc-server: failed to open file '%s'.", signature_file.c_str());
+        D("No signature file found for '%s'('%s')", filepath, signature_file.c_str());
+        return {};
     }
 
     auto [tree_offset, tree_size] = skip_id_sig_headers(fd);
diff --git a/adb/client/incremental_utils.h b/adb/client/incremental_utils.h
index fe2914d..4ad60dd 100644
--- a/adb/client/incremental_utils.h
+++ b/adb/client/incremental_utils.h
@@ -33,6 +33,7 @@
 constexpr int kBlockSize = 4096;
 constexpr int kSha256DigestSize = 32;
 constexpr int kDigestSize = kSha256DigestSize;
+constexpr int kMaxSignatureSize = 8096;  // incrementalfs.h
 
 constexpr std::string_view IDSIG = ".idsig";
 
diff --git a/adb/compression_utils.h b/adb/compression_utils.h
index a0c48a2..a747108 100644
--- a/adb/compression_utils.h
+++ b/adb/compression_utils.h
@@ -25,6 +25,7 @@
 #include <brotli/decode.h>
 #include <brotli/encode.h>
 #include <lz4frame.h>
+#include <zstd.h>
 
 #include "types.h"
 
@@ -381,3 +382,105 @@
     std::unique_ptr<LZ4F_cctx, LZ4F_errorCode_t (*)(LZ4F_cctx*)> encoder_;
     IOVector output_buffer_;
 };
+
+struct ZstdDecoder final : public Decoder {
+    explicit ZstdDecoder(std::span<char> output_buffer)
+        : Decoder(output_buffer), decoder_(ZSTD_createDStream(), ZSTD_freeDStream) {
+        if (!decoder_) {
+            LOG(FATAL) << "failed to initialize Zstd decompression context";
+        }
+    }
+
+    DecodeResult Decode(std::span<char>* output) final {
+        ZSTD_inBuffer in;
+        in.src = input_buffer_.front_data();
+        in.size = input_buffer_.front_size();
+        in.pos = 0;
+
+        ZSTD_outBuffer out;
+        out.dst = output_buffer_.data();
+        // The standard specifies size() as returning size_t, but our current version of
+        // libc++ returns a signed value instead.
+        out.size = static_cast<size_t>(output_buffer_.size());
+        out.pos = 0;
+
+        size_t rc = ZSTD_decompressStream(decoder_.get(), &out, &in);
+        if (ZSTD_isError(rc)) {
+            LOG(ERROR) << "ZSTD_decompressStream failed: " << ZSTD_getErrorName(rc);
+            return DecodeResult::Error;
+        }
+
+        input_buffer_.drop_front(in.pos);
+        if (rc == 0) {
+            if (!input_buffer_.empty()) {
+                LOG(ERROR) << "Zstd stream hit end before reading all data";
+                return DecodeResult::Error;
+            }
+            zstd_done_ = true;
+        }
+
+        *output = std::span<char>(output_buffer_.data(), out.pos);
+
+        if (finished_) {
+            return input_buffer_.empty() && zstd_done_ ? DecodeResult::Done
+                                                       : DecodeResult::MoreOutput;
+        }
+        return DecodeResult::NeedInput;
+    }
+
+  private:
+    bool zstd_done_ = false;
+    std::unique_ptr<ZSTD_DStream, size_t (*)(ZSTD_DStream*)> decoder_;
+};
+
+struct ZstdEncoder final : public Encoder {
+    explicit ZstdEncoder(size_t output_block_size)
+        : Encoder(output_block_size), encoder_(ZSTD_createCStream(), ZSTD_freeCStream) {
+        if (!encoder_) {
+            LOG(FATAL) << "failed to initialize Zstd compression context";
+        }
+        ZSTD_CCtx_setParameter(encoder_.get(), ZSTD_c_compressionLevel, 1);
+    }
+
+    EncodeResult Encode(Block* output) final {
+        ZSTD_inBuffer in;
+        in.src = input_buffer_.front_data();
+        in.size = input_buffer_.front_size();
+        in.pos = 0;
+
+        output->resize(output_block_size_);
+
+        ZSTD_outBuffer out;
+        out.dst = output->data();
+        out.size = static_cast<size_t>(output->size());
+        out.pos = 0;
+
+        ZSTD_EndDirective end_directive = finished_ ? ZSTD_e_end : ZSTD_e_continue;
+        size_t rc = ZSTD_compressStream2(encoder_.get(), &out, &in, end_directive);
+        if (ZSTD_isError(rc)) {
+            LOG(ERROR) << "ZSTD_compressStream2 failed: " << ZSTD_getErrorName(rc);
+            return EncodeResult::Error;
+        }
+
+        input_buffer_.drop_front(in.pos);
+        output->resize(out.pos);
+
+        if (rc == 0) {
+            // Zstd finished flushing its data.
+            if (finished_) {
+                if (!input_buffer_.empty()) {
+                    LOG(ERROR) << "ZSTD_compressStream2 finished early";
+                    return EncodeResult::Error;
+                }
+                return EncodeResult::Done;
+            } else {
+                return input_buffer_.empty() ? EncodeResult::NeedInput : EncodeResult::MoreOutput;
+            }
+        } else {
+            return EncodeResult::MoreOutput;
+        }
+    }
+
+  private:
+    std::unique_ptr<ZSTD_CStream, size_t (*)(ZSTD_CStream*)> encoder_;
+};
diff --git a/adb/daemon/file_sync_service.cpp b/adb/daemon/file_sync_service.cpp
index d58131e..513b8dd 100644
--- a/adb/daemon/file_sync_service.cpp
+++ b/adb/daemon/file_sync_service.cpp
@@ -272,7 +272,8 @@
     syncmsg msg;
     Block buffer(SYNC_DATA_MAX);
     std::span<char> buffer_span(buffer.data(), buffer.size());
-    std::variant<std::monostate, NullDecoder, BrotliDecoder, LZ4Decoder> decoder_storage;
+    std::variant<std::monostate, NullDecoder, BrotliDecoder, LZ4Decoder, ZstdDecoder>
+            decoder_storage;
     Decoder* decoder = nullptr;
 
     switch (compression) {
@@ -288,6 +289,10 @@
             decoder = &decoder_storage.emplace<LZ4Decoder>(buffer_span);
             break;
 
+        case CompressionType::Zstd:
+            decoder = &decoder_storage.emplace<ZstdDecoder>(buffer_span);
+            break;
+
         case CompressionType::Any:
             LOG(FATAL) << "unexpected CompressionType::Any";
     }
@@ -590,6 +595,15 @@
         }
         compression = CompressionType::LZ4;
     }
+    if (msg.send_v2_setup.flags & kSyncFlagZstd) {
+        msg.send_v2_setup.flags &= ~kSyncFlagZstd;
+        if (compression) {
+            SendSyncFail(s, android::base::StringPrintf("multiple compression flags received: %d",
+                                                        orig_flags));
+            return false;
+        }
+        compression = CompressionType::Zstd;
+    }
     if (msg.send_v2_setup.flags & kSyncFlagDryRun) {
         msg.send_v2_setup.flags &= ~kSyncFlagDryRun;
         dry_run = true;
@@ -623,7 +637,8 @@
     syncmsg msg;
     msg.data.id = ID_DATA;
 
-    std::variant<std::monostate, NullEncoder, BrotliEncoder, LZ4Encoder> encoder_storage;
+    std::variant<std::monostate, NullEncoder, BrotliEncoder, LZ4Encoder, ZstdEncoder>
+            encoder_storage;
     Encoder* encoder;
 
     switch (compression) {
@@ -639,6 +654,10 @@
             encoder = &encoder_storage.emplace<LZ4Encoder>(SYNC_DATA_MAX);
             break;
 
+        case CompressionType::Zstd:
+            encoder = &encoder_storage.emplace<ZstdEncoder>(SYNC_DATA_MAX);
+            break;
+
         case CompressionType::Any:
             LOG(FATAL) << "unexpected CompressionType::Any";
     }
@@ -726,6 +745,15 @@
         }
         compression = CompressionType::LZ4;
     }
+    if (msg.recv_v2_setup.flags & kSyncFlagZstd) {
+        msg.recv_v2_setup.flags &= ~kSyncFlagZstd;
+        if (compression) {
+            SendSyncFail(s, android::base::StringPrintf("multiple compression flags received: %d",
+                                                        orig_flags));
+            return false;
+        }
+        compression = CompressionType::Zstd;
+    }
 
     if (msg.recv_v2_setup.flags) {
         SendSyncFail(s, android::base::StringPrintf("unknown flags: %d", msg.recv_v2_setup.flags));
diff --git a/adb/file_sync_protocol.h b/adb/file_sync_protocol.h
index 8f8f85f..5234c20 100644
--- a/adb/file_sync_protocol.h
+++ b/adb/file_sync_protocol.h
@@ -93,6 +93,7 @@
     kSyncFlagNone = 0,
     kSyncFlagBrotli = 1,
     kSyncFlagLZ4 = 2,
+    kSyncFlagZstd = 4,
     kSyncFlagDryRun = 0x8000'0000U,
 };
 
@@ -101,6 +102,7 @@
     Any,
     Brotli,
     LZ4,
+    Zstd,
 };
 
 // send_v1 sent the path in a buffer, followed by a comma and the mode as a string.
diff --git a/adb/test_adb.py b/adb/test_adb.py
index 4b99411..b9f0d54 100755
--- a/adb/test_adb.py
+++ b/adb/test_adb.py
@@ -34,7 +34,6 @@
 import unittest
 import warnings
 from importlib import util
-from parameterized import parameterized_class
 
 def find_open_port():
     # Find an open port.
@@ -620,118 +619,129 @@
         zeroconf_ctx.unregister_service(info)
 
 """Should match the service names listed in adb_mdns.h"""
-@parameterized_class(('service_name',), [
-    ("adb",),
-    ("adb-tls-connect",),
-    ("adb-tls-pairing",),
-])
-@unittest.skipIf(not is_adb_mdns_available(), "mdns feature not available")
-class MdnsTest(unittest.TestCase):
+class MdnsTest:
     """Tests for adb mdns."""
 
-    @staticmethod
-    def _mdns_services(port):
-        output = subprocess.check_output(["adb", "-P", str(port), "mdns", "services"])
-        return [x.split("\t") for x in output.decode("utf8").strip().splitlines()[1:]]
+    class Base(unittest.TestCase):
+        @staticmethod
+        def _mdns_services(port):
+            output = subprocess.check_output(["adb", "-P", str(port), "mdns", "services"])
+            return [x.split("\t") for x in output.decode("utf8").strip().splitlines()[1:]]
 
-    @staticmethod
-    def _devices(port):
-        output = subprocess.check_output(["adb", "-P", str(port), "devices"])
-        return [x.split("\t") for x in output.decode("utf8").strip().splitlines()[1:]]
+        @staticmethod
+        def _devices(port):
+            output = subprocess.check_output(["adb", "-P", str(port), "devices"])
+            return [x.split("\t") for x in output.decode("utf8").strip().splitlines()[1:]]
 
-    @contextlib.contextmanager
-    def _adb_mdns_connect(self, server_port, mdns_instance, serial, should_connect):
-        """Context manager for an ADB connection.
+        @contextlib.contextmanager
+        def _adb_mdns_connect(self, server_port, mdns_instance, serial, should_connect):
+            """Context manager for an ADB connection.
 
-        This automatically disconnects when done with the connection.
-        """
+            This automatically disconnects when done with the connection.
+            """
 
-        output = subprocess.check_output(["adb", "-P", str(server_port), "connect", mdns_instance])
-        if should_connect:
-            self.assertEqual(output.strip(), "connected to {}".format(serial).encode("utf8"))
-        else:
-            self.assertTrue(output.startswith("failed to resolve host: '{}'"
-                .format(mdns_instance).encode("utf8")))
+            output = subprocess.check_output(["adb", "-P", str(server_port), "connect", mdns_instance])
+            if should_connect:
+                self.assertEqual(output.strip(), "connected to {}".format(serial).encode("utf8"))
+            else:
+                self.assertTrue(output.startswith("failed to resolve host: '{}'"
+                    .format(mdns_instance).encode("utf8")))
 
-        try:
-            yield
-        finally:
-            # Perform best-effort disconnection. Discard the output.
-            subprocess.Popen(["adb", "disconnect", serial],
-                             stdout=subprocess.PIPE,
-                             stderr=subprocess.PIPE).communicate()
+            try:
+                yield
+            finally:
+                # Perform best-effort disconnection. Discard the output.
+                subprocess.Popen(["adb", "disconnect", serial],
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE).communicate()
 
 
-    @unittest.skipIf(not is_zeroconf_installed(), "zeroconf library not installed")
-    def test_mdns_services_register_unregister(self):
-        """Ensure that `adb mdns services` correctly adds and removes a service
-        """
-        from zeroconf import IPVersion, ServiceInfo
+        @unittest.skipIf(not is_zeroconf_installed(), "zeroconf library not installed")
+        def test_mdns_services_register_unregister(self):
+            """Ensure that `adb mdns services` correctly adds and removes a service
+            """
+            from zeroconf import IPVersion, ServiceInfo
 
-        with adb_server() as server_port:
-            output = subprocess.check_output(["adb", "-P", str(server_port),
-                                              "mdns", "services"]).strip()
-            self.assertTrue(output.startswith(b"List of discovered mdns services"))
+            with adb_server() as server_port:
+                output = subprocess.check_output(["adb", "-P", str(server_port),
+                                                  "mdns", "services"]).strip()
+                self.assertTrue(output.startswith(b"List of discovered mdns services"))
 
-            """TODO(joshuaduong): Add ipv6 tests once we have it working in adb"""
-            """Register/Unregister a service"""
-            with zeroconf_context(IPVersion.V4Only) as zc:
-                serv_instance = "my_fake_test_service"
-                serv_type = "_" + self.service_name + "._tcp."
-                serv_ipaddr = socket.inet_aton("1.2.3.4")
-                serv_port = 12345
-                service_info = ServiceInfo(
-                        serv_type + "local.",
-                        name=serv_instance + "." + serv_type + "local.",
-                        addresses=[serv_ipaddr],
-                        port=serv_port)
-                with zeroconf_register_service(zc, service_info) as info:
-                    """Give adb some time to register the service"""
-                    time.sleep(1)
-                    self.assertTrue(any((serv_instance in line and serv_type in line)
-                        for line in MdnsTest._mdns_services(server_port)))
-
-                """Give adb some time to unregister the service"""
-                time.sleep(1)
-                self.assertFalse(any((serv_instance in line and serv_type in line)
-                    for line in MdnsTest._mdns_services(server_port)))
-
-    @unittest.skipIf(not is_zeroconf_installed(), "zeroconf library not installed")
-    def test_mdns_connect(self):
-        """Ensure that `adb connect` by mdns instance name works (for non-pairing services)
-        """
-        from zeroconf import IPVersion, ServiceInfo
-
-        with adb_server() as server_port:
-            with zeroconf_context(IPVersion.V4Only) as zc:
-                serv_instance = "fakeadbd-" + ''.join(
-                        random.choice(string.ascii_letters) for i in range(4))
-                serv_type = "_" + self.service_name + "._tcp."
-                serv_ipaddr = socket.inet_aton("127.0.0.1")
-                should_connect = self.service_name != "adb-tls-pairing"
-                with fake_adbd() as (port, _):
+                """TODO(joshuaduong): Add ipv6 tests once we have it working in adb"""
+                """Register/Unregister a service"""
+                with zeroconf_context(IPVersion.V4Only) as zc:
+                    serv_instance = "my_fake_test_service"
+                    serv_type = "_" + self.service_name + "._tcp."
+                    serv_ipaddr = socket.inet_aton("1.2.3.4")
+                    serv_port = 12345
                     service_info = ServiceInfo(
                             serv_type + "local.",
                             name=serv_instance + "." + serv_type + "local.",
                             addresses=[serv_ipaddr],
-                            port=port)
+                            port=serv_port)
                     with zeroconf_register_service(zc, service_info) as info:
                         """Give adb some time to register the service"""
                         time.sleep(1)
                         self.assertTrue(any((serv_instance in line and serv_type in line)
                             for line in MdnsTest._mdns_services(server_port)))
-                        full_name = '.'.join([serv_instance, serv_type])
-                        with self._adb_mdns_connect(server_port, serv_instance, full_name,
-                                should_connect):
-                            if should_connect:
-                                self.assertEqual(MdnsTest._devices(server_port),
-                                        [[full_name, "device"]])
 
                     """Give adb some time to unregister the service"""
                     time.sleep(1)
                     self.assertFalse(any((serv_instance in line and serv_type in line)
                         for line in MdnsTest._mdns_services(server_port)))
 
+        @unittest.skipIf(not is_zeroconf_installed(), "zeroconf library not installed")
+        def test_mdns_connect(self):
+            """Ensure that `adb connect` by mdns instance name works (for non-pairing services)
+            """
+            from zeroconf import IPVersion, ServiceInfo
+
+            with adb_server() as server_port:
+                with zeroconf_context(IPVersion.V4Only) as zc:
+                    serv_instance = "fakeadbd-" + ''.join(
+                            random.choice(string.ascii_letters) for i in range(4))
+                    serv_type = "_" + self.service_name + "._tcp."
+                    serv_ipaddr = socket.inet_aton("127.0.0.1")
+                    should_connect = self.service_name != "adb-tls-pairing"
+                    with fake_adbd() as (port, _):
+                        service_info = ServiceInfo(
+                                serv_type + "local.",
+                                name=serv_instance + "." + serv_type + "local.",
+                                addresses=[serv_ipaddr],
+                                port=port)
+                        with zeroconf_register_service(zc, service_info) as info:
+                            """Give adb some time to register the service"""
+                            time.sleep(1)
+                            self.assertTrue(any((serv_instance in line and serv_type in line)
+                                for line in MdnsTest._mdns_services(server_port)))
+                            full_name = '.'.join([serv_instance, serv_type])
+                            with self._adb_mdns_connect(server_port, serv_instance, full_name,
+                                    should_connect):
+                                if should_connect:
+                                    self.assertEqual(MdnsTest._devices(server_port),
+                                            [[full_name, "device"]])
+
+                        """Give adb some time to unregister the service"""
+                        time.sleep(1)
+                        self.assertFalse(any((serv_instance in line and serv_type in line)
+                            for line in MdnsTest._mdns_services(server_port)))
+
+
+@unittest.skipIf(not is_adb_mdns_available(), "mdns feature not available")
+class MdnsTestAdb(MdnsTest.Base):
+    service_name = "adb"
+
+
+@unittest.skipIf(not is_adb_mdns_available(), "mdns feature not available")
+class MdnsTestAdbTlsConnect(MdnsTest.Base):
+    service_name = "adb-tls-connect"
+
+
+@unittest.skipIf(not is_adb_mdns_available(), "mdns feature not available")
+class MdnsTestAdbTlsPairing(MdnsTest.Base):
+    service_name = "adb-tls-pairing"
+
+
 def main():
     """Main entrypoint."""
     random.seed(0)
diff --git a/adb/test_device.py b/adb/test_device.py
index 9f1f403..c1caafc 100755
--- a/adb/test_device.py
+++ b/adb/test_device.py
@@ -1362,6 +1362,10 @@
     compression = "lz4"
 
 
+class FileOperationsTestZstd(FileOperationsTest.Base):
+    compression = "zstd"
+
+
 class DeviceOfflineTest(DeviceTest):
     def _get_device_state(self, serialno):
         output = subprocess.check_output(self.device.adb_cmd + ['devices'])
diff --git a/adb/tools/check_ms_os_desc.cpp b/adb/tools/check_ms_os_desc.cpp
index 8743ff7..8e85809 100644
--- a/adb/tools/check_ms_os_desc.cpp
+++ b/adb/tools/check_ms_os_desc.cpp
@@ -131,8 +131,6 @@
         errx(1, "failed to retrieve MS OS v1 compat descriptor: %s", libusb_error_name(rc));
     }
 
-    memcpy(&hdr, data.data(), data.size());
-
     struct __attribute__((packed)) ms_os_desc_v1_function {
         uint8_t bFirstInterfaceNumber;
         uint8_t reserved1;
diff --git a/adb/transport.cpp b/adb/transport.cpp
index 1667011..b6b6984 100644
--- a/adb/transport.cpp
+++ b/adb/transport.cpp
@@ -85,6 +85,7 @@
 const char* const kFeatureSendRecv2 = "sendrecv_v2";
 const char* const kFeatureSendRecv2Brotli = "sendrecv_v2_brotli";
 const char* const kFeatureSendRecv2LZ4 = "sendrecv_v2_lz4";
+const char* const kFeatureSendRecv2Zstd = "sendrecv_v2_zstd";
 const char* const kFeatureSendRecv2DryRunSend = "sendrecv_v2_dry_run_send";
 
 namespace {
@@ -1189,6 +1190,7 @@
                 kFeatureSendRecv2,
                 kFeatureSendRecv2Brotli,
                 kFeatureSendRecv2LZ4,
+                kFeatureSendRecv2Zstd,
                 kFeatureSendRecv2DryRunSend,
                 // Increment ADB_SERVER_VERSION when adding a feature that adbd needs
                 // to know about. Otherwise, the client can be stuck running an old
diff --git a/adb/transport.h b/adb/transport.h
index 2ac21cf..b1f2744 100644
--- a/adb/transport.h
+++ b/adb/transport.h
@@ -93,6 +93,8 @@
 extern const char* const kFeatureSendRecv2Brotli;
 // adbd supports LZ4 for send/recv v2.
 extern const char* const kFeatureSendRecv2LZ4;
+// adbd supports Zstd for send/recv v2.
+extern const char* const kFeatureSendRecv2Zstd;
 // adbd supports dry-run send for send/recv v2.
 extern const char* const kFeatureSendRecv2DryRunSend;
 
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 7abc936..46d1d36 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -1229,7 +1229,7 @@
 static void CancelSnapshotIfNeeded() {
     std::string merge_status = "none";
     if (fb->GetVar(FB_VAR_SNAPSHOT_UPDATE_STATUS, &merge_status) == fastboot::SUCCESS &&
-        merge_status != "none") {
+        !merge_status.empty() && merge_status != "none") {
         fb->SnapshotUpdateCommand("cancel");
     }
 }
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 8c2e001..6e78d17 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -1099,8 +1099,28 @@
                 }
 
                 android::dm::DmTable table;
-                if (!table.AddTarget(std::make_unique<android::dm::DmTargetBow>(
-                            0, size, entry->blk_device))) {
+                auto bowTarget =
+                        std::make_unique<android::dm::DmTargetBow>(0, size, entry->blk_device);
+
+                // dm-bow uses the first block as a log record, and relocates the real first block
+                // elsewhere. For metadata encrypted devices, dm-bow sits below dm-default-key, and
+                // for post Android Q devices dm-default-key uses a block size of 4096 always.
+                // So if dm-bow's block size, which by default is the block size of the underlying
+                // hardware, is less than dm-default-key's, blocks will get broken up and I/O will
+                // fail as it won't be data_unit_size aligned.
+                // However, since it is possible there is an already shipping non
+                // metadata-encrypted device with smaller blocks, we must not change this for
+                // devices shipped with Q or earlier unless they explicitly selected dm-default-key
+                // v2
+                constexpr unsigned int pre_gki_level = __ANDROID_API_Q__;
+                unsigned int options_format_version = android::base::GetUintProperty<unsigned int>(
+                        "ro.crypto.dm_default_key.options_format.version",
+                        (android::fscrypt::GetFirstApiLevel() <= pre_gki_level ? 1 : 2));
+                if (options_format_version > 1) {
+                    bowTarget->SetBlockSize(4096);
+                }
+
+                if (!table.AddTarget(std::move(bowTarget))) {
                     LERROR << "Failed to add bow target";
                     return false;
                 }
diff --git a/fs_mgr/libdm/dm_target.cpp b/fs_mgr/libdm/dm_target.cpp
index a594198..250cb82 100644
--- a/fs_mgr/libdm/dm_target.cpp
+++ b/fs_mgr/libdm/dm_target.cpp
@@ -120,6 +120,11 @@
     return keyid_ + " " + block_device_;
 }
 
+std::string DmTargetBow::GetParameterString() const {
+    if (!block_size_) return target_string_;
+    return target_string_ + " 1 block_size:" + std::to_string(block_size_);
+}
+
 std::string DmTargetSnapshot::name() const {
     if (mode_ == SnapshotStorageMode::Merge) {
         return "snapshot-merge";
diff --git a/fs_mgr/libdm/include/libdm/dm_target.h b/fs_mgr/libdm/include/libdm/dm_target.h
index 57096ce..f986cfe 100644
--- a/fs_mgr/libdm/include/libdm/dm_target.h
+++ b/fs_mgr/libdm/include/libdm/dm_target.h
@@ -175,11 +175,14 @@
     DmTargetBow(uint64_t start, uint64_t length, const std::string& target_string)
         : DmTarget(start, length), target_string_(target_string) {}
 
+    void SetBlockSize(uint32_t block_size) { block_size_ = block_size; }
+
     std::string name() const override { return "bow"; }
-    std::string GetParameterString() const override { return target_string_; }
+    std::string GetParameterString() const override;
 
   private:
     std::string target_string_;
+    uint32_t block_size_ = 0;
 };
 
 enum class SnapshotStorageMode {
diff --git a/fs_mgr/libsnapshot/android/snapshot/snapshot.proto b/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
index 2ac0c44..0328132 100644
--- a/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
+++ b/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
@@ -132,7 +132,7 @@
     uint64 metadata_sectors = 4;
 }
 
-// Next: 2
+// Next: 4
 message SnapshotMergeReport {
     // Status of the update after the merge attempts.
     UpdateState state = 1;
@@ -140,4 +140,7 @@
     // Number of reboots that occurred after issuing and before completeing the
     // merge of all the snapshot devices.
     int32 resume_count = 2;
+
+    // Total size of all the COW images before the update.
+    uint64 cow_file_size = 3;
 }
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
index cf0b085..4457de3 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
@@ -25,7 +25,7 @@
     MOCK_METHOD(bool, BeginUpdate, (), (override));
     MOCK_METHOD(bool, CancelUpdate, (), (override));
     MOCK_METHOD(bool, FinishedSnapshotWrites, (bool wipe), (override));
-    MOCK_METHOD(bool, InitiateMerge, (), (override));
+    MOCK_METHOD(bool, InitiateMerge, (uint64_t * cow_file_size), (override));
 
     MOCK_METHOD(UpdateState, ProcessUpdateState,
                 (const std::function<bool()>& callback, const std::function<bool()>& before_cancel),
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
index 2d6071f..3c2c776 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
@@ -124,7 +124,7 @@
 
     // Initiate a merge on all snapshot devices. This should only be used after an
     // update has been marked successful after booting.
-    virtual bool InitiateMerge() = 0;
+    virtual bool InitiateMerge(uint64_t* cow_file_size = nullptr) = 0;
 
     // Perform any necessary post-boot actions. This should be run soon after
     // /data is mounted.
@@ -281,7 +281,7 @@
     bool BeginUpdate() override;
     bool CancelUpdate() override;
     bool FinishedSnapshotWrites(bool wipe) override;
-    bool InitiateMerge() override;
+    bool InitiateMerge(uint64_t* cow_file_size = nullptr) override;
     UpdateState ProcessUpdateState(const std::function<bool()>& callback = {},
                                    const std::function<bool()>& before_cancel = {}) override;
     UpdateState GetUpdateState(double* progress = nullptr) override;
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
index 4caf632..d691d4f 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
@@ -29,6 +29,8 @@
     // Called when merge starts or resumes.
     virtual bool Start() = 0;
     virtual void set_state(android::snapshot::UpdateState state) = 0;
+    virtual void set_cow_file_size(uint64_t cow_file_size) = 0;
+    virtual uint64_t cow_file_size() = 0;
 
     // Called when merge ends. Properly clean up permanent storage.
     class Result {
@@ -50,6 +52,8 @@
     // ISnapshotMergeStats overrides
     bool Start() override;
     void set_state(android::snapshot::UpdateState state) override;
+    void set_cow_file_size(uint64_t cow_file_size) override;
+    uint64_t cow_file_size() override;
     std::unique_ptr<Result> Finish() override;
 
   private:
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
index 9c82906..7a27fad 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
@@ -27,7 +27,7 @@
     bool BeginUpdate() override;
     bool CancelUpdate() override;
     bool FinishedSnapshotWrites(bool wipe) override;
-    bool InitiateMerge() override;
+    bool InitiateMerge(uint64_t* cow_file_size = nullptr) override;
     UpdateState ProcessUpdateState(const std::function<bool()>& callback = {},
                                    const std::function<bool()>& before_cancel = {}) override;
     UpdateState GetUpdateState(double* progress = nullptr) override;
diff --git a/fs_mgr/libsnapshot/snapshot.cpp b/fs_mgr/libsnapshot/snapshot.cpp
index 488009a..5909cff 100644
--- a/fs_mgr/libsnapshot/snapshot.cpp
+++ b/fs_mgr/libsnapshot/snapshot.cpp
@@ -555,7 +555,7 @@
     return true;
 }
 
-bool SnapshotManager::InitiateMerge() {
+bool SnapshotManager::InitiateMerge(uint64_t* cow_file_size) {
     auto lock = LockExclusive();
     if (!lock) return false;
 
@@ -618,6 +618,7 @@
         }
     }
 
+    uint64_t total_cow_file_size = 0;
     DmTargetSnapshot::Status initial_target_values = {};
     for (const auto& snapshot : snapshots) {
         DmTargetSnapshot::Status current_status;
@@ -627,6 +628,16 @@
         initial_target_values.sectors_allocated += current_status.sectors_allocated;
         initial_target_values.total_sectors += current_status.total_sectors;
         initial_target_values.metadata_sectors += current_status.metadata_sectors;
+
+        SnapshotStatus snapshot_status;
+        if (!ReadSnapshotStatus(lock.get(), snapshot, &snapshot_status)) {
+            return false;
+        }
+        total_cow_file_size += snapshot_status.cow_file_size();
+    }
+
+    if (cow_file_size) {
+        *cow_file_size = total_cow_file_size;
     }
 
     SnapshotUpdateStatus initial_status;
diff --git a/fs_mgr/libsnapshot/snapshot_stats.cpp b/fs_mgr/libsnapshot/snapshot_stats.cpp
index 5da7b98..3723730 100644
--- a/fs_mgr/libsnapshot/snapshot_stats.cpp
+++ b/fs_mgr/libsnapshot/snapshot_stats.cpp
@@ -88,6 +88,15 @@
     report_.set_state(state);
 }
 
+void SnapshotMergeStats::set_cow_file_size(uint64_t cow_file_size) {
+    report_.set_cow_file_size(cow_file_size);
+    WriteState();
+}
+
+uint64_t SnapshotMergeStats::cow_file_size() {
+    return report_.cow_file_size();
+}
+
 class SnapshotMergeStatsResultImpl : public SnapshotMergeStats::Result {
   public:
     SnapshotMergeStatsResultImpl(const SnapshotMergeReport& report,
diff --git a/fs_mgr/libsnapshot/snapshot_stub.cpp b/fs_mgr/libsnapshot/snapshot_stub.cpp
index 2aaa78c..9b6f758 100644
--- a/fs_mgr/libsnapshot/snapshot_stub.cpp
+++ b/fs_mgr/libsnapshot/snapshot_stub.cpp
@@ -42,7 +42,7 @@
     return false;
 }
 
-bool SnapshotManagerStub::InitiateMerge() {
+bool SnapshotManagerStub::InitiateMerge(uint64_t*) {
     LOG(ERROR) << __FUNCTION__ << " should never be called.";
     return false;
 }
@@ -118,6 +118,8 @@
 class SnapshotMergeStatsStub : public ISnapshotMergeStats {
     bool Start() override { return false; }
     void set_state(android::snapshot::UpdateState) override {}
+    void set_cow_file_size(uint64_t) override {}
+    uint64_t cow_file_size() override { return 0; }
     std::unique_ptr<Result> Finish() override { return nullptr; }
 };
 
diff --git a/init/first_stage_init.cpp b/init/first_stage_init.cpp
index 1a608f6..0215576 100644
--- a/init/first_stage_init.cpp
+++ b/init/first_stage_init.cpp
@@ -24,6 +24,7 @@
 #include <sys/stat.h>
 #include <sys/sysmacros.h>
 #include <sys/types.h>
+#include <sys/utsname.h>
 #include <unistd.h>
 
 #include <filesystem>
@@ -99,6 +100,77 @@
 
 }  // namespace
 
+std::string GetModuleLoadList(bool recovery, const std::string& dir_path) {
+    auto module_load_file = "modules.load";
+    if (recovery) {
+        struct stat fileStat;
+        std::string recovery_load_path = dir_path + "/modules.load.recovery";
+        if (!stat(recovery_load_path.c_str(), &fileStat)) {
+            module_load_file = "modules.load.recovery";
+        }
+    }
+
+    return module_load_file;
+}
+
+#define MODULE_BASE_DIR "/lib/modules"
+bool LoadKernelModules(bool recovery, bool want_console) {
+    struct utsname uts;
+    if (uname(&uts)) {
+        LOG(FATAL) << "Failed to get kernel version.";
+    }
+    int major, minor;
+    if (sscanf(uts.release, "%d.%d", &major, &minor) != 2) {
+        LOG(FATAL) << "Failed to parse kernel version " << uts.release;
+    }
+
+    std::unique_ptr<DIR, decltype(&closedir)> base_dir(opendir(MODULE_BASE_DIR), closedir);
+    if (!base_dir) {
+        LOG(INFO) << "Unable to open /lib/modules, skipping module loading.";
+        return true;
+    }
+    dirent* entry;
+    std::vector<std::string> module_dirs;
+    while ((entry = readdir(base_dir.get()))) {
+        if (entry->d_type != DT_DIR) {
+            continue;
+        }
+        int dir_major, dir_minor;
+        if (sscanf(entry->d_name, "%d.%d", &dir_major, &dir_minor) != 2 || dir_major != major ||
+            dir_minor != minor) {
+            continue;
+        }
+        module_dirs.emplace_back(entry->d_name);
+    }
+
+    // Sort the directories so they are iterated over during module loading
+    // in a consistent order. Alphabetical sorting is fine here because the
+    // kernel version at the beginning of the directory name must match the
+    // current kernel version, so the sort only applies to a label that
+    // follows the kernel version, for example /lib/modules/5.4 vs.
+    // /lib/modules/5.4-gki.
+    std::sort(module_dirs.begin(), module_dirs.end());
+
+    for (const auto& module_dir : module_dirs) {
+        std::string dir_path = MODULE_BASE_DIR "/";
+        dir_path.append(module_dir);
+        Modprobe m({dir_path}, GetModuleLoadList(recovery, dir_path));
+        bool retval = m.LoadListedModules(!want_console);
+        int modules_loaded = m.GetModuleCount();
+        if (modules_loaded > 0) {
+            return retval;
+        }
+    }
+
+    Modprobe m({MODULE_BASE_DIR}, GetModuleLoadList(recovery, MODULE_BASE_DIR));
+    bool retval = m.LoadListedModules(!want_console);
+    int modules_loaded = m.GetModuleCount();
+    if (modules_loaded > 0) {
+        return retval;
+    }
+    return true;
+}
+
 int FirstStageMain(int argc, char** argv) {
     if (REBOOT_BOOTLOADER_ON_PANIC) {
         InstallRebootSignalHandlers();
@@ -190,18 +262,9 @@
         old_root_dir.reset();
     }
 
-    std::string module_load_file = "modules.load";
-    if (IsRecoveryMode() && !ForceNormalBoot(cmdline)) {
-        struct stat fileStat;
-        std::string recovery_load_path = "/lib/modules/modules.load.recovery";
-        if (!stat(recovery_load_path.c_str(), &fileStat)) {
-            module_load_file = "modules.load.recovery";
-        }
-    }
-
-    Modprobe m({"/lib/modules"}, module_load_file);
     auto want_console = ALLOW_FIRST_STAGE_CONSOLE ? FirstStageConsole(cmdline) : 0;
-    if (!m.LoadListedModules(!want_console)) {
+
+    if (!LoadKernelModules(IsRecoveryMode() && !ForceNormalBoot(cmdline), want_console)) {
         if (want_console != FirstStageConsoleParam::DISABLED) {
             LOG(ERROR) << "Failed to load kernel modules, starting console";
         } else {
diff --git a/libmodprobe/include/modprobe/modprobe.h b/libmodprobe/include/modprobe/modprobe.h
index 297036e..a7687af 100644
--- a/libmodprobe/include/modprobe/modprobe.h
+++ b/libmodprobe/include/modprobe/modprobe.h
@@ -34,6 +34,8 @@
     bool GetAllDependencies(const std::string& module, std::vector<std::string>* pre_dependencies,
                             std::vector<std::string>* dependencies,
                             std::vector<std::string>* post_dependencies);
+    void ResetModuleCount() { module_count_ = 0; }
+    int GetModuleCount() { return module_count_; }
     void EnableBlacklist(bool enable);
     void EnableVerbose(bool enable);
 
@@ -65,5 +67,6 @@
     std::unordered_map<std::string, std::string> module_options_;
     std::set<std::string> module_blacklist_;
     std::unordered_set<std::string> module_loaded_;
+    int module_count_ = 0;
     bool blacklist_enabled = false;
 };
diff --git a/libmodprobe/libmodprobe_ext.cpp b/libmodprobe/libmodprobe_ext.cpp
index 99472c1..6589708 100644
--- a/libmodprobe/libmodprobe_ext.cpp
+++ b/libmodprobe/libmodprobe_ext.cpp
@@ -63,6 +63,7 @@
 
     LOG(INFO) << "Loaded kernel module " << path_name;
     module_loaded_.emplace(canonical_name);
+    module_count_++;
     return true;
 }
 
diff --git a/libmodprobe/libmodprobe_ext_test.cpp b/libmodprobe/libmodprobe_ext_test.cpp
index 057dea3..9ee5ba7 100644
--- a/libmodprobe/libmodprobe_ext_test.cpp
+++ b/libmodprobe/libmodprobe_ext_test.cpp
@@ -56,6 +56,7 @@
     }
 
     modules_loaded.emplace_back(path_name + options);
+    module_count_++;
     return true;
 }
 
diff --git a/libmodprobe/libmodprobe_test.cpp b/libmodprobe/libmodprobe_test.cpp
index 879c7f2..eea0abd 100644
--- a/libmodprobe/libmodprobe_test.cpp
+++ b/libmodprobe/libmodprobe_test.cpp
@@ -161,6 +161,7 @@
 
     EXPECT_TRUE(modules_loaded == expected_modules_loaded);
 
+    EXPECT_TRUE(m.GetModuleCount() == 15);
     EXPECT_TRUE(m.Remove("test4"));
 
     GTEST_LOG_(INFO) << "Expected modules loaded after removing test4 (in order):";
diff --git a/libsparse/sparse.cpp b/libsparse/sparse.cpp
index 24c6379..8622b4c 100644
--- a/libsparse/sparse.cpp
+++ b/libsparse/sparse.cpp
@@ -136,11 +136,23 @@
   return 0;
 }
 
+/*
+ * This is a workaround for 32-bit Windows: Limit the block size to 64 MB before
+ * fastboot executable binary for windows 64-bit is released (b/156057250).
+ */
+#define MAX_BACKED_BLOCK_SIZE ((unsigned int) (64UL << 20))
+
 int sparse_file_write(struct sparse_file* s, int fd, bool gz, bool sparse, bool crc) {
+  struct backed_block* bb;
   int ret;
   int chunks;
   struct output_file* out;
 
+  for (bb = backed_block_iter_new(s->backed_block_list); bb; bb = backed_block_iter_next(bb)) {
+    ret = backed_block_split(s->backed_block_list, bb, MAX_BACKED_BLOCK_SIZE);
+    if (ret) return ret;
+  }
+
   chunks = sparse_count_chunks(s);
   out = output_file_open_fd(fd, s->block_size, s->len, gz, sparse, chunks, crc);
 
diff --git a/libsync/Android.bp b/libsync/Android.bp
index c996e1b..bad6230 100644
--- a/libsync/Android.bp
+++ b/libsync/Android.bp
@@ -25,6 +25,12 @@
     recovery_available: true,
     native_bridge_supported: true,
     defaults: ["libsync_defaults"],
+    stubs: {
+        symbol_file: "libsync.map.txt",
+        versions: [
+            "26",
+        ],
+    },
 }
 
 llndk_library {
diff --git a/libsync/libsync.map.txt b/libsync/libsync.map.txt
index 91c3528..aac6b57 100644
--- a/libsync/libsync.map.txt
+++ b/libsync/libsync.map.txt
@@ -19,7 +19,7 @@
     sync_merge; # introduced=26
     sync_file_info; # introduced=26
     sync_file_info_free; # introduced=26
-    sync_wait; # llndk
+    sync_wait; # llndk apex
     sync_fence_info; # llndk
     sync_pt_info; # llndk
     sync_fence_info_free; # llndk
diff --git a/logcat/event.logtags b/logcat/event.logtags
index 56a670a..93c3d6d 100644
--- a/logcat/event.logtags
+++ b/logcat/event.logtags
@@ -116,6 +116,9 @@
 # audio
 # 61000 - 61199 reserved for audioserver
 
+# input
+# 62000 - 62199 reserved for inputflinger
+
 # com.android.server.policy
 # 70000 - 70199 reserved for PhoneWindowManager and other policies
 
diff --git a/logcat/logcat.cpp b/logcat/logcat.cpp
index 13023f2..0056c80 100644
--- a/logcat/logcat.cpp
+++ b/logcat/logcat.cpp
@@ -36,6 +36,7 @@
 
 #include <memory>
 #include <regex>
+#include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ -358,6 +359,10 @@
   -T '<time>'                 Print the lines since specified time (not imply -d).
                               count is pure numerical, time is 'MM-DD hh:mm:ss.mmm...'
                               'YYYY-MM-DD hh:mm:ss.mmm...' or 'sssss.mmm...' format.
+  --uid=<uids>                Only display log messages from UIDs present in the comma separate list
+                              <uids>. No name look-up is performed, so UIDs must be provided as
+                              numeric values. This option is only useful for the 'root', 'log', and
+                              'system' users since only those users can view logs from other users.
 )init");
 
     fprintf(stderr, "\nfilterspecs are a series of \n"
@@ -535,6 +540,7 @@
     size_t pid = 0;
     bool got_t = false;
     unsigned id_mask = 0;
+    std::set<uid_t> uids;
 
     if (argc == 2 && !strcmp(argv[1], "--help")) {
         show_help();
@@ -554,6 +560,7 @@
         static const char id_str[] = "id";
         static const char wrap_str[] = "wrap";
         static const char print_str[] = "print";
+        static const char uid_str[] = "uid";
         // clang-format off
         static const struct option long_options[] = {
           { "binary",        no_argument,       nullptr, 'B' },
@@ -581,6 +588,7 @@
           { "statistics",    no_argument,       nullptr, 'S' },
           // hidden and undocumented reserved alias for -t
           { "tail",          required_argument, nullptr, 't' },
+          { uid_str,         required_argument, nullptr, 0 },
           // support, but ignore and do not document, the optional argument
           { wrap_str,        optional_argument, nullptr, 0 },
           { nullptr,         0,                 nullptr, 0 }
@@ -631,6 +639,17 @@
                 if (long_options[option_index].name == id_str) {
                     setId = (optarg && optarg[0]) ? optarg : nullptr;
                 }
+                if (long_options[option_index].name == uid_str) {
+                    auto uid_strings = Split(optarg, delimiters);
+                    for (const auto& uid_string : uid_strings) {
+                        uid_t uid;
+                        if (!ParseUint(uid_string, &uid)) {
+                            error(EXIT_FAILURE, 0, "Unable to parse UID '%s'", uid_string.c_str());
+                        }
+                        uids.emplace(uid);
+                    }
+                    break;
+                }
                 break;
 
             case 's':
@@ -1164,6 +1183,10 @@
                   LOG_ID_MAX);
         }
 
+        if (!uids.empty() && uids.count(log_msg.entry.uid) == 0) {
+            continue;
+        }
+
         PrintDividers(log_msg.id(), printDividers);
 
         if (print_binary_) {
diff --git a/logcat/tests/logcat_test.cpp b/logcat/tests/logcat_test.cpp
index f3fdfd7..a2daeb0 100644
--- a/logcat/tests/logcat_test.cpp
+++ b/logcat/tests/logcat_test.cpp
@@ -16,6 +16,7 @@
 
 #include <ctype.h>
 #include <dirent.h>
+#include <pwd.h>
 #include <signal.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -28,10 +29,12 @@
 #include <unistd.h>
 
 #include <memory>
+#include <regex>
 #include <string>
 
 #include <android-base/file.h>
 #include <android-base/macros.h>
+#include <android-base/parseint.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <gtest/gtest.h>
@@ -1748,3 +1751,83 @@
 
   ASSERT_TRUE(android::base::StartsWith(output, "unknown buffer foo\n"));
 }
+
+static void SniffUid(const std::string& line, uid_t& uid) {
+    auto uid_regex = std::regex{"\\S+\\s+\\S+\\s+(\\S+).*"};
+
+    auto trimmed_line = android::base::Trim(line);
+
+    std::smatch match_results;
+    ASSERT_TRUE(std::regex_match(trimmed_line, match_results, uid_regex))
+            << "Unable to find UID in line '" << trimmed_line << "'";
+    auto uid_string = match_results[1];
+    if (!android::base::ParseUint(uid_string, &uid)) {
+        auto pwd = getpwnam(uid_string.str().c_str());
+        ASSERT_NE(nullptr, pwd) << "uid '" << uid_string << "' in line '" << trimmed_line << "'";
+        uid = pwd->pw_uid;
+    }
+}
+
+static void UidsInLog(std::optional<std::vector<uid_t>> filter_uid, std::map<uid_t, size_t>& uids) {
+    std::string command;
+    if (filter_uid) {
+        std::vector<std::string> uid_strings;
+        for (const auto& uid : *filter_uid) {
+            uid_strings.emplace_back(std::to_string(uid));
+        }
+        command = android::base::StringPrintf(logcat_executable
+                                              " -v uid -b all -d 2>/dev/null --uid=%s",
+                                              android::base::Join(uid_strings, ",").c_str());
+    } else {
+        command = logcat_executable " -v uid -b all -d 2>/dev/null";
+    }
+    auto fp = std::unique_ptr<FILE, decltype(&pclose)>(popen(command.c_str(), "r"), pclose);
+    ASSERT_NE(nullptr, fp);
+
+    char buffer[BIG_BUFFER];
+    while (fgets(buffer, sizeof(buffer), fp.get())) {
+        // Ignore dividers, e.g. '--------- beginning of radio'
+        if (android::base::StartsWith(buffer, "---------")) {
+            continue;
+        }
+        uid_t uid;
+        SniffUid(buffer, uid);
+        uids[uid]++;
+    }
+}
+
+static std::vector<uid_t> TopTwoInMap(const std::map<uid_t, size_t>& uids) {
+    std::pair<uid_t, size_t> top = {0, 0};
+    std::pair<uid_t, size_t> second = {0, 0};
+    for (const auto& [uid, count] : uids) {
+        if (count > top.second) {
+            top = second;
+            top = {uid, count};
+        } else if (count > second.second) {
+            second = {uid, count};
+        }
+    }
+    return {top.first, second.first};
+}
+
+TEST(logcat, uid_filter) {
+    std::map<uid_t, size_t> uids;
+    UidsInLog({}, uids);
+
+    ASSERT_GT(uids.size(), 2U);
+    auto top_uids = TopTwoInMap(uids);
+
+    // Test filtering with --uid=<top uid>
+    std::map<uid_t, size_t> uids_only_top;
+    std::vector<uid_t> top_uid = {top_uids[0]};
+    UidsInLog(top_uid, uids_only_top);
+
+    EXPECT_EQ(1U, uids_only_top.size());
+
+    // Test filtering with --uid=<top uid>,<2nd top uid>
+    std::map<uid_t, size_t> uids_only_top2;
+    std::vector<uid_t> top2_uids = {top_uids[0], top_uids[1]};
+    UidsInLog(top2_uids, uids_only_top2);
+
+    EXPECT_EQ(2U, uids_only_top2.size());
+}
diff --git a/logd/ChattyLogBuffer.cpp b/logd/ChattyLogBuffer.cpp
index 0ba6025..f92fe65 100644
--- a/logd/ChattyLogBuffer.cpp
+++ b/logd/ChattyLogBuffer.cpp
@@ -48,38 +48,34 @@
 
 enum match_type { DIFFERENT, SAME, SAME_LIBLOG };
 
-static enum match_type Identical(LogBufferElement* elem, LogBufferElement* last) {
-    // is it mostly identical?
-    //  if (!elem) return DIFFERENT;
-    ssize_t lenl = elem->getMsgLen();
+static enum match_type Identical(const LogBufferElement& elem, const LogBufferElement& last) {
+    ssize_t lenl = elem.msg_len();
     if (lenl <= 0) return DIFFERENT;  // value if this represents a chatty elem
-    //  if (!last) return DIFFERENT;
-    ssize_t lenr = last->getMsgLen();
+    ssize_t lenr = last.msg_len();
     if (lenr <= 0) return DIFFERENT;  // value if this represents a chatty elem
-    //  if (elem->getLogId() != last->getLogId()) return DIFFERENT;
-    if (elem->getUid() != last->getUid()) return DIFFERENT;
-    if (elem->getPid() != last->getPid()) return DIFFERENT;
-    if (elem->getTid() != last->getTid()) return DIFFERENT;
+    if (elem.uid() != last.uid()) return DIFFERENT;
+    if (elem.pid() != last.pid()) return DIFFERENT;
+    if (elem.tid() != last.tid()) return DIFFERENT;
 
     // last is more than a minute old, stop squashing identical messages
-    if (elem->getRealTime().nsec() > (last->getRealTime().nsec() + 60 * NS_PER_SEC))
-        return DIFFERENT;
+    if (elem.realtime().nsec() > (last.realtime().nsec() + 60 * NS_PER_SEC)) return DIFFERENT;
 
     // Identical message
-    const char* msgl = elem->getMsg();
-    const char* msgr = last->getMsg();
+    const char* msgl = elem.msg();
+    const char* msgr = last.msg();
     if (lenl == lenr) {
         if (!fastcmp<memcmp>(msgl, msgr, lenl)) return SAME;
         // liblog tagged messages (content gets summed)
-        if (elem->getLogId() == LOG_ID_EVENTS && lenl == sizeof(android_log_event_int_t) &&
+        if (elem.log_id() == LOG_ID_EVENTS && lenl == sizeof(android_log_event_int_t) &&
             !fastcmp<memcmp>(msgl, msgr, sizeof(android_log_event_int_t) - sizeof(int32_t)) &&
-            elem->getTag() == LIBLOG_LOG_TAG) {
+            elem.GetTag() == LIBLOG_LOG_TAG) {
             return SAME_LIBLOG;
         }
     }
 
     // audit message (except sequence number) identical?
-    if (last->isBinary() && lenl > static_cast<ssize_t>(sizeof(android_log_event_string_t)) &&
+    if (IsBinary(last.log_id()) &&
+        lenl > static_cast<ssize_t>(sizeof(android_log_event_string_t)) &&
         lenr > static_cast<ssize_t>(sizeof(android_log_event_string_t))) {
         if (fastcmp<memcmp>(msgl, msgr, sizeof(android_log_event_string_t) - sizeof(int32_t))) {
             return DIFFERENT;
@@ -105,11 +101,11 @@
 
 void ChattyLogBuffer::LogInternal(LogBufferElement&& elem) {
     // b/137093665: don't coalesce security messages.
-    if (elem.getLogId() == LOG_ID_SECURITY) {
+    if (elem.log_id() == LOG_ID_SECURITY) {
         SimpleLogBuffer::LogInternal(std::move(elem));
         return;
     }
-    int log_id = elem.getLogId();
+    int log_id = elem.log_id();
 
     // Initialize last_logged_elements_ to a copy of elem if logging the first element for a log_id.
     if (!last_logged_elements_[log_id]) {
@@ -119,12 +115,12 @@
     }
 
     LogBufferElement& current_last = *last_logged_elements_[log_id];
-    enum match_type match = Identical(&elem, &current_last);
+    enum match_type match = Identical(elem, current_last);
 
     if (match == DIFFERENT) {
         if (duplicate_elements_[log_id]) {
             // If we previously had 3+ identical messages, log the chatty message.
-            if (duplicate_elements_[log_id]->getDropped() > 0) {
+            if (duplicate_elements_[log_id]->dropped_count() > 0) {
                 SimpleLogBuffer::LogInternal(std::move(*duplicate_elements_[log_id]));
             }
             duplicate_elements_[log_id].reset();
@@ -146,10 +142,10 @@
     // 3+ identical LIBLOG event messages: coalesce them into last_logged_elements_.
     if (match == SAME_LIBLOG) {
         const android_log_event_int_t* current_last_event =
-                reinterpret_cast<const android_log_event_int_t*>(current_last.getMsg());
+                reinterpret_cast<const android_log_event_int_t*>(current_last.msg());
         int64_t current_last_count = current_last_event->payload.data;
         android_log_event_int_t* elem_event =
-                reinterpret_cast<android_log_event_int_t*>(const_cast<char*>(elem.getMsg()));
+                reinterpret_cast<android_log_event_int_t*>(const_cast<char*>(elem.msg()));
         int64_t elem_count = elem_event->payload.data;
 
         int64_t total = current_last_count + elem_count;
@@ -158,22 +154,22 @@
             last_logged_elements_[log_id].emplace(std::move(elem));
             return;
         }
-        stats()->AddTotal(current_last.getLogId(), current_last.getMsgLen());
+        stats()->AddTotal(current_last.log_id(), current_last.msg_len());
         elem_event->payload.data = total;
         last_logged_elements_[log_id].emplace(std::move(elem));
         return;
     }
 
     // 3+ identical messages (not LIBLOG) messages: increase the drop count.
-    uint16_t dropped_count = duplicate_elements_[log_id]->getDropped();
+    uint16_t dropped_count = duplicate_elements_[log_id]->dropped_count();
     if (dropped_count == std::numeric_limits<uint16_t>::max()) {
         SimpleLogBuffer::LogInternal(std::move(*duplicate_elements_[log_id]));
         dropped_count = 0;
     }
     // We're dropping the current_last log so add its stats to the total.
-    stats()->AddTotal(current_last.getLogId(), current_last.getMsgLen());
+    stats()->AddTotal(current_last.log_id(), current_last.msg_len());
     // Use current_last for tracking the dropped count to always use the latest timestamp.
-    current_last.setDropped(dropped_count + 1);
+    current_last.SetDropped(dropped_count + 1);
     duplicate_elements_[log_id].emplace(std::move(current_last));
     last_logged_elements_[log_id].emplace(std::move(elem));
 }
@@ -181,14 +177,13 @@
 LogBufferElementCollection::iterator ChattyLogBuffer::Erase(LogBufferElementCollection::iterator it,
                                                             bool coalesce) {
     LogBufferElement& element = *it;
-    log_id_t id = element.getLogId();
+    log_id_t id = element.log_id();
 
     // Remove iterator references in the various lists that will become stale
     // after the element is erased from the main logging list.
 
     {  // start of scope for found iterator
-        int key = (id == LOG_ID_EVENTS || id == LOG_ID_SECURITY) ? element.getTag()
-                                                                 : element.getUid();
+        int key = (id == LOG_ID_EVENTS || id == LOG_ID_SECURITY) ? element.GetTag() : element.uid();
         LogBufferIteratorMap::iterator found = mLastWorst[id].find(key);
         if ((found != mLastWorst[id].end()) && (it == found->second)) {
             mLastWorst[id].erase(found);
@@ -196,10 +191,10 @@
     }
 
     {  // start of scope for pid found iterator
-        // element->getUid() may not be AID_SYSTEM for next-best-watermark.
+        // element->uid() may not be AID_SYSTEM for next-best-watermark.
         // will not assume id != LOG_ID_EVENTS or LOG_ID_SECURITY for KISS and
         // long term code stability, find() check should be fast for those ids.
-        LogBufferPidIteratorMap::iterator found = mLastWorstPidOfSystem[id].find(element.getPid());
+        LogBufferPidIteratorMap::iterator found = mLastWorstPidOfSystem[id].find(element.pid());
         if (found != mLastWorstPidOfSystem[id].end() && it == found->second) {
             mLastWorstPidOfSystem[id].erase(found);
         }
@@ -207,14 +202,13 @@
 
 #ifdef DEBUG_CHECK_FOR_STALE_ENTRIES
     LogBufferElementCollection::iterator bad = it;
-    int key =
-            (id == LOG_ID_EVENTS || id == LOG_ID_SECURITY) ? element->getTag() : element->getUid();
+    int key = (id == LOG_ID_EVENTS || id == LOG_ID_SECURITY) ? element->GetTag() : element->uid();
 #endif
 
     if (coalesce) {
-        stats()->Erase(&element);
+        stats()->Erase(element.ToLogStatisticsElement());
     } else {
-        stats()->Subtract(&element);
+        stats()->Subtract(element.ToLogStatisticsElement());
     }
 
     it = SimpleLogBuffer::Erase(it);
@@ -223,12 +217,12 @@
     log_id_for_each(i) {
         for (auto b : mLastWorst[i]) {
             if (bad == b.second) {
-                android::prdebug("stale mLastWorst[%d] key=%d mykey=%d\n", i, b.first, key);
+                LOG(ERROR) << StringPrintf("stale mLastWorst[%d] key=%d mykey=%d", i, b.first, key);
             }
         }
         for (auto b : mLastWorstPidOfSystem[i]) {
             if (bad == b.second) {
-                android::prdebug("stale mLastWorstPidOfSystem[%d] pid=%d\n", i, b.first);
+                LOG(ERROR) << StringPrintf("stale mLastWorstPidOfSystem[%d] pid=%d", i, b.first);
             }
         }
     }
@@ -245,15 +239,15 @@
 
   public:
     bool coalesce(LogBufferElement* element, uint16_t dropped) {
-        uint64_t key = LogBufferElementKey(element->getUid(), element->getPid(), element->getTid());
+        uint64_t key = LogBufferElementKey(element->uid(), element->pid(), element->tid());
         LogBufferElementMap::iterator it = map.find(key);
         if (it != map.end()) {
             LogBufferElement* found = it->second;
-            uint16_t moreDropped = found->getDropped();
+            uint16_t moreDropped = found->dropped_count();
             if ((dropped + moreDropped) > USHRT_MAX) {
                 map.erase(it);
             } else {
-                found->setDropped(dropped + moreDropped);
+                found->SetDropped(dropped + moreDropped);
                 return true;
             }
         }
@@ -261,18 +255,18 @@
     }
 
     void add(LogBufferElement* element) {
-        uint64_t key = LogBufferElementKey(element->getUid(), element->getPid(), element->getTid());
+        uint64_t key = LogBufferElementKey(element->uid(), element->pid(), element->tid());
         map[key] = element;
     }
 
     void clear() { map.clear(); }
 
     void clear(LogBufferElement* element) {
-        uint64_t current = element->getRealTime().nsec() - (EXPIRE_RATELIMIT * NS_PER_SEC);
+        uint64_t current = element->realtime().nsec() - (EXPIRE_RATELIMIT * NS_PER_SEC);
         for (LogBufferElementMap::iterator it = map.begin(); it != map.end();) {
             LogBufferElement* mapElement = it->second;
-            if (mapElement->getDropped() >= EXPIRE_THRESHOLD &&
-                current > mapElement->getRealTime().nsec()) {
+            if (mapElement->dropped_count() >= EXPIRE_THRESHOLD &&
+                current > mapElement->realtime().nsec()) {
                 it = map.erase(it);
             } else {
                 ++it;
@@ -359,12 +353,12 @@
         while (it != logs().end()) {
             LogBufferElement& element = *it;
 
-            if (element.getLogId() != id || element.getUid() != caller_uid) {
+            if (element.log_id() != id || element.uid() != caller_uid) {
                 ++it;
                 continue;
             }
 
-            if (oldest && oldest->start() <= element.getSequence()) {
+            if (oldest && oldest->start() <= element.sequence()) {
                 busy = true;
                 KickReader(oldest, id, pruneRows);
                 break;
@@ -382,7 +376,7 @@
     bool hasBlacklist = (id != LOG_ID_SECURITY) && prune_->naughty();
     while (!clearAll && (pruneRows > 0)) {
         // recalculate the worst offender on every batched pass
-        int worst = -1;  // not valid for getUid() or getKey()
+        int worst = -1;  // not valid for uid() or getKey()
         size_t worst_sizes = 0;
         size_t second_worst_sizes = 0;
         pid_t worstPid = 0;  // POSIX guarantees PID != 0
@@ -445,19 +439,19 @@
         while (it != logs().end()) {
             LogBufferElement& element = *it;
 
-            if (oldest && oldest->start() <= element.getSequence()) {
+            if (oldest && oldest->start() <= element.sequence()) {
                 busy = true;
                 // Do not let chatty eliding trigger any reader mitigation
                 break;
             }
 
-            if (element.getLogId() != id) {
+            if (element.log_id() != id) {
                 ++it;
                 continue;
             }
-            // below this point element->getLogId() == id
+            // below this point element->log_id() == id
 
-            uint16_t dropped = element.getDropped();
+            uint16_t dropped = element.dropped_count();
 
             // remove any leading drops
             if (leading && dropped) {
@@ -470,8 +464,8 @@
                 continue;
             }
 
-            int key = (id == LOG_ID_EVENTS || id == LOG_ID_SECURITY) ? element.getTag()
-                                                                     : element.getUid();
+            int key = (id == LOG_ID_EVENTS || id == LOG_ID_SECURITY) ? element.GetTag()
+                                                                     : element.uid();
 
             if (hasBlacklist && prune_->naughty(&element)) {
                 last.clear(&element);
@@ -490,25 +484,25 @@
                     if (worst_sizes < second_worst_sizes) {
                         break;
                     }
-                    worst_sizes -= element.getMsgLen();
+                    worst_sizes -= element.msg_len();
                 }
                 continue;
             }
 
-            if (element.getRealTime() < (lastt->getRealTime() - too_old) ||
-                element.getRealTime() > lastt->getRealTime()) {
+            if (element.realtime() < (lastt->realtime() - too_old) ||
+                element.realtime() > lastt->realtime()) {
                 break;
             }
 
             if (dropped) {
                 last.add(&element);
-                if (worstPid && ((!gc && element.getPid() == worstPid) ||
-                                 mLastWorstPidOfSystem[id].find(element.getPid()) ==
+                if (worstPid && ((!gc && element.pid() == worstPid) ||
+                                 mLastWorstPidOfSystem[id].find(element.pid()) ==
                                          mLastWorstPidOfSystem[id].end())) {
-                    // element->getUid() may not be AID_SYSTEM, next best
+                    // element->uid() may not be AID_SYSTEM, next best
                     // watermark if current one empty. id is not LOG_ID_EVENTS
                     // or LOG_ID_SECURITY because of worstPid check.
-                    mLastWorstPidOfSystem[id][element.getPid()] = it;
+                    mLastWorstPidOfSystem[id][element.pid()] = it;
                 }
                 if ((!gc && !worstPid && (key == worst)) ||
                     (mLastWorst[id].find(key) == mLastWorst[id].end())) {
@@ -518,14 +512,14 @@
                 continue;
             }
 
-            if (key != worst || (worstPid && element.getPid() != worstPid)) {
+            if (key != worst || (worstPid && element.pid() != worstPid)) {
                 leading = false;
                 last.clear(&element);
                 ++it;
                 continue;
             }
             // key == worst below here
-            // If worstPid set, then element->getPid() == worstPid below here
+            // If worstPid set, then element->pid() == worstPid below here
 
             pruneRows--;
             if (pruneRows == 0) {
@@ -534,21 +528,21 @@
 
             kick = true;
 
-            uint16_t len = element.getMsgLen();
+            uint16_t len = element.msg_len();
 
             // do not create any leading drops
             if (leading) {
                 it = Erase(it);
             } else {
-                stats()->Drop(&element);
-                element.setDropped(1);
+                stats()->Drop(element.ToLogStatisticsElement());
+                element.SetDropped(1);
                 if (last.coalesce(&element, 1)) {
                     it = Erase(it, true);
                 } else {
                     last.add(&element);
                     if (worstPid && (!gc || mLastWorstPidOfSystem[id].find(worstPid) ==
                                                     mLastWorstPidOfSystem[id].end())) {
-                        // element->getUid() may not be AID_SYSTEM, next best
+                        // element->uid() may not be AID_SYSTEM, next best
                         // watermark if current one empty. id is not
                         // LOG_ID_EVENTS or LOG_ID_SECURITY because of worstPid.
                         mLastWorstPidOfSystem[id][worstPid] = it;
@@ -577,18 +571,18 @@
     while ((pruneRows > 0) && (it != logs().end())) {
         LogBufferElement& element = *it;
 
-        if (element.getLogId() != id) {
+        if (element.log_id() != id) {
             it++;
             continue;
         }
 
-        if (oldest && oldest->start() <= element.getSequence()) {
+        if (oldest && oldest->start() <= element.sequence()) {
             busy = true;
             if (!whitelist) KickReader(oldest, id, pruneRows);
             break;
         }
 
-        if (hasWhitelist && !element.getDropped() && prune_->nice(&element)) {
+        if (hasWhitelist && !element.dropped_count() && prune_->nice(&element)) {
             // WhiteListed
             whitelist = true;
             it++;
@@ -605,12 +599,12 @@
         while ((it != logs().end()) && (pruneRows > 0)) {
             LogBufferElement& element = *it;
 
-            if (element.getLogId() != id) {
+            if (element.log_id() != id) {
                 ++it;
                 continue;
             }
 
-            if (oldest && oldest->start() <= element.getSequence()) {
+            if (oldest && oldest->start() <= element.sequence()) {
                 busy = true;
                 KickReader(oldest, id, pruneRows);
                 break;
diff --git a/logd/ChattyLogBufferTest.cpp b/logd/ChattyLogBufferTest.cpp
index 2e0c947..3d9005a 100644
--- a/logd/ChattyLogBufferTest.cpp
+++ b/logd/ChattyLogBufferTest.cpp
@@ -61,7 +61,8 @@
 
     std::vector<LogMessage> read_log_messages;
     std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, nullptr));
-    log_buffer_->FlushTo(test_writer.get(), 1, nullptr, nullptr);
+    std::unique_ptr<FlushToState> flush_to_state = log_buffer_->CreateFlushToState(1, kLogMaskAll);
+    EXPECT_TRUE(log_buffer_->FlushTo(test_writer.get(), *flush_to_state, nullptr));
 
     std::vector<LogMessage> expected_log_messages = {
             make_message(0, "test_tag", "duplicate"),
@@ -72,12 +73,12 @@
             make_message(5, "test_tag", "not_same"),
             // 3 duplicate logs together print the first, a 1 count chatty message, then the last.
             make_message(6, "test_tag", "duplicate"),
-            make_message(7, "chatty", "uid=0\\([^\\)]+\\) [^ ]+ expire 1 line", true),
+            make_message(7, "chatty", "uid=0\\([^\\)]+\\) [^ ]+ identical 1 line", true),
             make_message(8, "test_tag", "duplicate"),
             make_message(9, "test_tag", "not_same"),
             // 6 duplicate logs together print the first, a 4 count chatty message, then the last.
             make_message(10, "test_tag", "duplicate"),
-            make_message(14, "chatty", "uid=0\\([^\\)]+\\) [^ ]+ expire 4 lines", true),
+            make_message(14, "chatty", "uid=0\\([^\\)]+\\) [^ ]+ identical 4 lines", true),
             make_message(15, "test_tag", "duplicate"),
             make_message(16, "test_tag", "not_same"),
             // duplicate logs > 1 minute apart are not deduplicated.
@@ -117,15 +118,16 @@
 
     std::vector<LogMessage> read_log_messages;
     std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, nullptr));
-    log_buffer_->FlushTo(test_writer.get(), 1, nullptr, nullptr);
+    std::unique_ptr<FlushToState> flush_to_state = log_buffer_->CreateFlushToState(1, kLogMaskAll);
+    EXPECT_TRUE(log_buffer_->FlushTo(test_writer.get(), *flush_to_state, nullptr));
 
     std::vector<LogMessage> expected_log_messages = {
             make_message(0, "test_tag", "normal"),
             make_message(1, "test_tag", "duplicate"),
             make_message(expired_per_chatty_message + 1, "chatty",
-                         "uid=0\\([^\\)]+\\) [^ ]+ expire 65535 lines", true),
+                         "uid=0\\([^\\)]+\\) [^ ]+ identical 65535 lines", true),
             make_message(expired_per_chatty_message + 2, "chatty",
-                         "uid=0\\([^\\)]+\\) [^ ]+ expire 1 line", true),
+                         "uid=0\\([^\\)]+\\) [^ ]+ identical 1 line", true),
             make_message(expired_per_chatty_message + 3, "test_tag", "duplicate"),
             make_message(expired_per_chatty_message + 4, "test_tag", "normal"),
     };
@@ -172,7 +174,8 @@
 
     std::vector<LogMessage> read_log_messages;
     std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, nullptr));
-    log_buffer_->FlushTo(test_writer.get(), 1, nullptr, nullptr);
+    std::unique_ptr<FlushToState> flush_to_state = log_buffer_->CreateFlushToState(1, kLogMaskAll);
+    EXPECT_TRUE(log_buffer_->FlushTo(test_writer.get(), *flush_to_state, nullptr));
 
     std::vector<LogMessage> expected_log_messages = {
             make_message(0, 1234, 1),
@@ -199,4 +202,134 @@
     CompareLogMessages(expected_log_messages, read_log_messages);
 };
 
-INSTANTIATE_TEST_CASE_P(ChattyLogBufferTests, ChattyLogBufferTest, testing::Values("chatty"));
\ No newline at end of file
+TEST_P(ChattyLogBufferTest, no_leading_chatty_simple) {
+    auto make_message = [&](uint32_t sec, int32_t pid, uint32_t uid, uint32_t lid, const char* tag,
+                            const char* msg, bool regex = false) -> LogMessage {
+        logger_entry entry = {.pid = pid, .tid = 1, .sec = sec, .nsec = 1, .lid = lid, .uid = uid};
+        std::string message;
+        message.push_back(ANDROID_LOG_INFO);
+        message.append(tag);
+        message.push_back('\0');
+        message.append(msg);
+        message.push_back('\0');
+        return {entry, message, regex};
+    };
+
+    // clang-format off
+    std::vector<LogMessage> log_messages = {
+            make_message(1, 1, 1, LOG_ID_MAIN, "test_tag", "duplicate1"),
+            make_message(2, 2, 2, LOG_ID_SYSTEM, "test_tag", "duplicate2"),
+            make_message(3, 2, 2, LOG_ID_SYSTEM, "test_tag", "duplicate2"),
+            make_message(4, 2, 2, LOG_ID_SYSTEM, "test_tag", "duplicate2"),
+            make_message(6, 2, 2, LOG_ID_SYSTEM, "test_tag", "not duplicate2"),
+            make_message(7, 1, 1, LOG_ID_MAIN, "test_tag", "duplicate1"),
+            make_message(8, 1, 1, LOG_ID_MAIN, "test_tag", "duplicate1"),
+            make_message(9, 1, 1, LOG_ID_MAIN, "test_tag", "duplicate1"),
+            make_message(10, 1, 1, LOG_ID_MAIN, "test_tag", "not duplicate1"),
+    };
+    // clang-format on
+    FixupMessages(&log_messages);
+    LogMessages(log_messages);
+
+    // After logging log_messages, the below is what should be in the buffer:
+    // PID=1, LOG_ID_MAIN duplicate1
+    // [1] PID=2, LOG_ID_SYSTEM duplicate2
+    // PID=2, LOG_ID_SYSTEM chatty drop
+    // PID=2, LOG_ID_SYSTEM duplicate2
+    // PID=2, LOG_ID_SYSTEM not duplicate2
+    // [2] PID=1, LOG_ID_MAIN chatty drop
+    // [3] PID=1, LOG_ID_MAIN duplicate1
+    // PID=1, LOG_ID_MAIN not duplicate1
+
+    // We then read from the 2nd sequence number, starting from log message [1], but filtering out
+    // everything but PID=1, which results in us starting with log message [2], which is a chatty
+    // drop.  Code prior to this test case would erroneously print it.  The intended behavior that
+    // this test checks prints logs starting from log message [3].
+
+    // clang-format off
+    std::vector<LogMessage> expected_log_messages = {
+            make_message(9, 1, 1, LOG_ID_MAIN, "test_tag", "duplicate1"),
+            make_message(10, 1, 1, LOG_ID_MAIN, "test_tag", "not duplicate1"),
+    };
+    FixupMessages(&expected_log_messages);
+    // clang-format on
+
+    std::vector<LogMessage> read_log_messages;
+    bool released = false;
+    {
+        auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
+        std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, &released));
+        std::unique_ptr<LogReaderThread> log_reader(
+                new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(test_writer), true,
+                                    0, ~0, 1, {}, 2, {}));
+        reader_list_.reader_threads().emplace_back(std::move(log_reader));
+    }
+
+    while (!released) {
+        usleep(5000);
+    }
+
+    CompareLogMessages(expected_log_messages, read_log_messages);
+}
+
+TEST_P(ChattyLogBufferTest, no_leading_chatty_tail) {
+    auto make_message = [&](uint32_t sec, const char* tag, const char* msg,
+                            bool regex = false) -> LogMessage {
+        logger_entry entry = {
+                .pid = 1, .tid = 1, .sec = sec, .nsec = 1, .lid = LOG_ID_MAIN, .uid = 0};
+        std::string message;
+        message.push_back(ANDROID_LOG_INFO);
+        message.append(tag);
+        message.push_back('\0');
+        message.append(msg);
+        message.push_back('\0');
+        return {entry, message, regex};
+    };
+
+    // clang-format off
+    std::vector<LogMessage> log_messages = {
+            make_message(1, "test_tag", "duplicate"),
+            make_message(2, "test_tag", "duplicate"),
+            make_message(3, "test_tag", "duplicate"),
+            make_message(4, "test_tag", "not_duplicate"),
+    };
+    // clang-format on
+    FixupMessages(&log_messages);
+    LogMessages(log_messages);
+
+    // After logging log_messages, the below is what should be in the buffer:
+    // "duplicate"
+    // chatty
+    // "duplicate"
+    // "not duplicate"
+
+    // We then read the tail 3 messages expecting there to not be a chatty message, meaning that we
+    // should only see the last two messages.
+
+    // clang-format off
+    std::vector<LogMessage> expected_log_messages = {
+            make_message(3, "test_tag", "duplicate"),
+            make_message(4, "test_tag", "not_duplicate"),
+    };
+    FixupMessages(&expected_log_messages);
+    // clang-format on
+
+    std::vector<LogMessage> read_log_messages;
+    bool released = false;
+    {
+        auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
+        std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, &released));
+        std::unique_ptr<LogReaderThread> log_reader(
+                new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(test_writer), true,
+                                    3, ~0, 0, {}, 1, {}));
+        reader_list_.reader_threads().emplace_back(std::move(log_reader));
+    }
+
+    while (!released) {
+        usleep(5000);
+    }
+
+    CompareLogMessages(expected_log_messages, read_log_messages);
+}
+
+INSTANTIATE_TEST_CASE_P(ChattyLogBufferTests, ChattyLogBufferTest, testing::Values("chatty"));
diff --git a/logd/CommandListener.cpp b/logd/CommandListener.cpp
index c6ab22d..9764c44 100644
--- a/logd/CommandListener.cpp
+++ b/logd/CommandListener.cpp
@@ -31,6 +31,7 @@
 
 #include <string>
 
+#include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 #include <cutils/sockets.h>
 #include <log/log_properties.h>
@@ -298,7 +299,7 @@
                                            char** /*argv*/) {
     setname();
 
-    android::prdebug("logd reinit");
+    LOG(INFO) << "logd reinit";
     buf()->Init();
     prune()->init(nullptr);
 
diff --git a/logd/LogBuffer.h b/logd/LogBuffer.h
index 859d740..c5d333a 100644
--- a/logd/LogBuffer.h
+++ b/logd/LogBuffer.h
@@ -25,6 +25,27 @@
 
 #include "LogWriter.h"
 
+// A mask to represent which log buffers a reader is watching, values are (1 << LOG_ID_MAIN), etc.
+using LogMask = uint32_t;
+constexpr uint32_t kLogMaskAll = 0xFFFFFFFF;
+
+// State that a LogBuffer may want to persist across calls to FlushTo().
+class FlushToState {
+  public:
+    FlushToState(uint64_t start, LogMask log_mask) : start_(start), log_mask_(log_mask) {}
+    virtual ~FlushToState() {}
+
+    uint64_t start() const { return start_; }
+    void set_start(uint64_t start) { start_ = start; }
+
+    LogMask log_mask() const { return log_mask_; }
+
+  private:
+    uint64_t start_;
+    LogMask log_mask_;
+};
+
+// Enum for the return values of the `filter` function passed to FlushTo().
 enum class FilterResult {
     kSkip,
     kStop,
@@ -39,19 +60,16 @@
 
     virtual int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid,
                     const char* msg, uint16_t len) = 0;
-    // lastTid is an optional context to help detect if the last previous
-    // valid message was from the same source so we can differentiate chatty
-    // filter types (identical or expired)
-    static const uint64_t FLUSH_ERROR = 0;
-    virtual uint64_t FlushTo(LogWriter* writer, uint64_t start,
-                             pid_t* last_tid,  // nullable
-                             const std::function<FilterResult(log_id_t log_id, pid_t pid,
-                                                              uint64_t sequence, log_time realtime,
-                                                              uint16_t dropped_count)>& filter) = 0;
+
+    virtual std::unique_ptr<FlushToState> CreateFlushToState(uint64_t start, LogMask log_mask) = 0;
+    virtual bool FlushTo(
+            LogWriter* writer, FlushToState& state,
+            const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
+                                             log_time realtime)>& filter) = 0;
 
     virtual bool Clear(log_id_t id, uid_t uid) = 0;
     virtual unsigned long GetSize(log_id_t id) = 0;
     virtual int SetSize(log_id_t id, unsigned long size) = 0;
 
     virtual uint64_t sequence() const = 0;
-};
\ No newline at end of file
+};
diff --git a/logd/LogBufferElement.cpp b/logd/LogBufferElement.cpp
index c6dbda8..ef9f1cf 100644
--- a/logd/LogBufferElement.cpp
+++ b/logd/LogBufferElement.cpp
@@ -32,92 +32,101 @@
 
 LogBufferElement::LogBufferElement(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid,
                                    pid_t tid, uint64_t sequence, const char* msg, uint16_t len)
-    : mUid(uid),
-      mPid(pid),
-      mTid(tid),
-      mSequence(sequence),
-      mRealTime(realtime),
-      mMsgLen(len),
-      mLogId(log_id),
-      mDropped(false) {
-    mMsg = new char[len];
-    memcpy(mMsg, msg, len);
+    : uid_(uid),
+      pid_(pid),
+      tid_(tid),
+      sequence_(sequence),
+      realtime_(realtime),
+      msg_len_(len),
+      log_id_(log_id),
+      dropped_(false) {
+    msg_ = new char[len];
+    memcpy(msg_, msg, len);
 }
 
 LogBufferElement::LogBufferElement(const LogBufferElement& elem)
-    : mUid(elem.mUid),
-      mPid(elem.mPid),
-      mTid(elem.mTid),
-      mSequence(elem.mSequence),
-      mRealTime(elem.mRealTime),
-      mMsgLen(elem.mMsgLen),
-      mLogId(elem.mLogId),
-      mDropped(elem.mDropped) {
-    if (mDropped) {
-        mTag = elem.getTag();
+    : uid_(elem.uid_),
+      pid_(elem.pid_),
+      tid_(elem.tid_),
+      sequence_(elem.sequence_),
+      realtime_(elem.realtime_),
+      msg_len_(elem.msg_len_),
+      log_id_(elem.log_id_),
+      dropped_(elem.dropped_) {
+    if (dropped_) {
+        tag_ = elem.GetTag();
     } else {
-        mMsg = new char[mMsgLen];
-        memcpy(mMsg, elem.mMsg, mMsgLen);
+        msg_ = new char[msg_len_];
+        memcpy(msg_, elem.msg_, msg_len_);
     }
 }
 
 LogBufferElement::LogBufferElement(LogBufferElement&& elem)
-    : mUid(elem.mUid),
-      mPid(elem.mPid),
-      mTid(elem.mTid),
-      mSequence(elem.mSequence),
-      mRealTime(elem.mRealTime),
-      mMsgLen(elem.mMsgLen),
-      mLogId(elem.mLogId),
-      mDropped(elem.mDropped) {
-    if (mDropped) {
-        mTag = elem.getTag();
+    : uid_(elem.uid_),
+      pid_(elem.pid_),
+      tid_(elem.tid_),
+      sequence_(elem.sequence_),
+      realtime_(elem.realtime_),
+      msg_len_(elem.msg_len_),
+      log_id_(elem.log_id_),
+      dropped_(elem.dropped_) {
+    if (dropped_) {
+        tag_ = elem.GetTag();
     } else {
-        mMsg = elem.mMsg;
-        elem.mMsg = nullptr;
+        msg_ = elem.msg_;
+        elem.msg_ = nullptr;
     }
 }
 
 LogBufferElement::~LogBufferElement() {
-    if (!mDropped) {
-        delete[] mMsg;
+    if (!dropped_) {
+        delete[] msg_;
     }
 }
 
-uint32_t LogBufferElement::getTag() const {
+uint32_t LogBufferElement::GetTag() const {
     // Binary buffers have no tag.
-    if (!isBinary()) {
+    if (!IsBinary(log_id())) {
         return 0;
     }
 
-    // Dropped messages store the tag in place of mMsg.
-    if (mDropped) {
-        return mTag;
+    // Dropped messages store the tag in place of msg_.
+    if (dropped_) {
+        return tag_;
     }
 
-    // For non-dropped messages, we get the tag from the message header itself.
-    if (mMsgLen < sizeof(android_event_header_t)) {
-        return 0;
-    }
-
-    return reinterpret_cast<const android_event_header_t*>(mMsg)->tag;
+    return MsgToTag(msg(), msg_len());
 }
 
-uint16_t LogBufferElement::setDropped(uint16_t value) {
-    if (mDropped) {
-        return mDroppedCount = value;
+LogStatisticsElement LogBufferElement::ToLogStatisticsElement() const {
+    return LogStatisticsElement{
+            .uid = uid(),
+            .pid = pid(),
+            .tid = tid(),
+            .tag = GetTag(),
+            .realtime = realtime(),
+            .msg = msg(),
+            .msg_len = msg_len(),
+            .dropped_count = dropped_count(),
+            .log_id = log_id(),
+    };
+}
+
+uint16_t LogBufferElement::SetDropped(uint16_t value) {
+    if (dropped_) {
+        return dropped_count_ = value;
     }
 
-    // The tag information is saved in mMsg data, which is in a union with mTag, used after mDropped
-    // is set to true. Therefore we save the tag value aside, delete mMsg, then set mTag to the tag
+    // The tag information is saved in msg_ data, which is in a union with tag_, used after dropped_
+    // is set to true. Therefore we save the tag value aside, delete msg_, then set tag_ to the tag
     // value in its place.
-    auto old_tag = getTag();
-    delete[] mMsg;
-    mMsg = nullptr;
+    auto old_tag = GetTag();
+    delete[] msg_;
+    msg_ = nullptr;
 
-    mTag = old_tag;
-    mDropped = true;
-    return mDroppedCount = value;
+    tag_ = old_tag;
+    dropped_ = true;
+    return dropped_count_ = value;
 }
 
 // caller must own and free character string
@@ -165,8 +174,8 @@
     return retval;
 }
 
-// assumption: mMsg == NULL
-size_t LogBufferElement::populateDroppedMessage(char*& buffer, LogStatistics* stats,
+// assumption: msg_ == NULL
+size_t LogBufferElement::PopulateDroppedMessage(char*& buffer, LogStatistics* stats,
                                                 bool lastSame) {
     static const char tag[] = "chatty";
 
@@ -176,13 +185,13 @@
     }
 
     static const char format_uid[] = "uid=%u%s%s %s %u line%s";
-    const char* name = stats->UidToName(mUid);
-    const char* commName = android::tidToName(mTid);
-    if (!commName && (mTid != mPid)) {
-        commName = android::tidToName(mPid);
+    const char* name = stats->UidToName(uid_);
+    const char* commName = android::tidToName(tid_);
+    if (!commName && (tid_ != pid_)) {
+        commName = android::tidToName(pid_);
     }
     if (!commName) {
-        commName = stats->PidToName(mPid);
+        commName = stats->PidToName(pid_);
     }
     if (name && name[0] && commName && (name[0] == commName[0])) {
         size_t len = strlen(name + 1);
@@ -214,12 +223,11 @@
     }
     // identical to below to calculate the buffer size required
     const char* type = lastSame ? "identical" : "expire";
-    size_t len = snprintf(nullptr, 0, format_uid, mUid, name ? name : "",
-                          commName ? commName : "", type, getDropped(),
-                          (getDropped() > 1) ? "s" : "");
+    size_t len = snprintf(nullptr, 0, format_uid, uid_, name ? name : "", commName ? commName : "",
+                          type, dropped_count(), (dropped_count() > 1) ? "s" : "");
 
     size_t hdrLen;
-    if (isBinary()) {
+    if (IsBinary(log_id())) {
         hdrLen = sizeof(android_log_event_string_t);
     } else {
         hdrLen = 1 + sizeof(tag);
@@ -233,7 +241,7 @@
     }
 
     size_t retval = hdrLen + len;
-    if (isBinary()) {
+    if (IsBinary(log_id())) {
         android_log_event_string_t* event =
             reinterpret_cast<android_log_event_string_t*>(buffer);
 
@@ -246,9 +254,8 @@
         strcpy(buffer + 1, tag);
     }
 
-    snprintf(buffer + hdrLen, len + 1, format_uid, mUid, name ? name : "",
-             commName ? commName : "", type, getDropped(),
-             (getDropped() > 1) ? "s" : "");
+    snprintf(buffer + hdrLen, len + 1, format_uid, uid_, name ? name : "", commName ? commName : "",
+             type, dropped_count(), (dropped_count() > 1) ? "s" : "");
     free(const_cast<char*>(name));
     free(const_cast<char*>(commName));
 
@@ -259,22 +266,22 @@
     struct logger_entry entry = {};
 
     entry.hdr_size = sizeof(struct logger_entry);
-    entry.lid = mLogId;
-    entry.pid = mPid;
-    entry.tid = mTid;
-    entry.uid = mUid;
-    entry.sec = mRealTime.tv_sec;
-    entry.nsec = mRealTime.tv_nsec;
+    entry.lid = log_id_;
+    entry.pid = pid_;
+    entry.tid = tid_;
+    entry.uid = uid_;
+    entry.sec = realtime_.tv_sec;
+    entry.nsec = realtime_.tv_nsec;
 
     char* buffer = nullptr;
     const char* msg;
-    if (mDropped) {
-        entry.len = populateDroppedMessage(buffer, stats, lastSame);
+    if (dropped_) {
+        entry.len = PopulateDroppedMessage(buffer, stats, lastSame);
         if (!entry.len) return true;
         msg = buffer;
     } else {
-        msg = mMsg;
-        entry.len = mMsgLen;
+        msg = msg_;
+        entry.len = msg_len_;
     }
 
     bool retval = writer->Write(entry, msg);
diff --git a/logd/LogBufferElement.h b/logd/LogBufferElement.h
index 35252f9..fd5d88f 100644
--- a/logd/LogBufferElement.h
+++ b/logd/LogBufferElement.h
@@ -24,7 +24,7 @@
 
 #include "LogWriter.h"
 
-class LogStatistics;
+#include "LogStatistics.h"
 
 #define EXPIRE_HOUR_THRESHOLD 24  // Only expire chatty UID logs to preserve
                                   // non-chatty UIDs less than this age in hours
@@ -33,26 +33,6 @@
 #define EXPIRE_RATELIMIT 10  // maximum rate in seconds to report expiration
 
 class __attribute__((packed)) LogBufferElement {
-    // sized to match reality of incoming log packets
-    const uint32_t mUid;
-    const uint32_t mPid;
-    const uint32_t mTid;
-    uint64_t mSequence;
-    log_time mRealTime;
-    union {
-        char* mMsg;    // mDropped == false
-        int32_t mTag;  // mDropped == true
-    };
-    union {
-        const uint16_t mMsgLen;  // mDropped == false
-        uint16_t mDroppedCount;  // mDropped == true
-    };
-    const uint8_t mLogId;
-    bool mDropped;
-
-    // assumption: mDropped == true
-    size_t populateDroppedMessage(char*& buffer, LogStatistics* parent, bool lastSame);
-
   public:
     LogBufferElement(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid,
                      uint64_t sequence, const char* msg, uint16_t len);
@@ -60,37 +40,41 @@
     LogBufferElement(LogBufferElement&& elem);
     ~LogBufferElement();
 
-    bool isBinary(void) const {
-        return (mLogId == LOG_ID_EVENTS) || (mLogId == LOG_ID_SECURITY);
-    }
-
-    log_id_t getLogId() const {
-        return static_cast<log_id_t>(mLogId);
-    }
-    uid_t getUid(void) const {
-        return mUid;
-    }
-    pid_t getPid(void) const {
-        return mPid;
-    }
-    pid_t getTid(void) const {
-        return mTid;
-    }
-    uint32_t getTag() const;
-    uint16_t getDropped(void) const {
-        return mDropped ? mDroppedCount : 0;
-    }
-    uint16_t setDropped(uint16_t value);
-    uint16_t getMsgLen() const {
-        return mDropped ? 0 : mMsgLen;
-    }
-    const char* getMsg() const {
-        return mDropped ? nullptr : mMsg;
-    }
-    uint64_t getSequence() const { return mSequence; }
-    log_time getRealTime(void) const {
-        return mRealTime;
-    }
+    uint32_t GetTag() const;
+    uint16_t SetDropped(uint16_t value);
 
     bool FlushTo(LogWriter* writer, LogStatistics* parent, bool lastSame);
+
+    LogStatisticsElement ToLogStatisticsElement() const;
+
+    log_id_t log_id() const { return static_cast<log_id_t>(log_id_); }
+    uid_t uid() const { return uid_; }
+    pid_t pid() const { return pid_; }
+    pid_t tid() const { return tid_; }
+    uint16_t msg_len() const { return dropped_ ? 0 : msg_len_; }
+    const char* msg() const { return dropped_ ? nullptr : msg_; }
+    uint64_t sequence() const { return sequence_; }
+    log_time realtime() const { return realtime_; }
+    uint16_t dropped_count() const { return dropped_ ? dropped_count_ : 0; }
+
+  private:
+    // assumption: mDropped == true
+    size_t PopulateDroppedMessage(char*& buffer, LogStatistics* parent, bool lastSame);
+
+    // sized to match reality of incoming log packets
+    const uint32_t uid_;
+    const uint32_t pid_;
+    const uint32_t tid_;
+    uint64_t sequence_;
+    log_time realtime_;
+    union {
+        char* msg_;    // mDropped == false
+        int32_t tag_;  // mDropped == true
+    };
+    union {
+        const uint16_t msg_len_;  // mDropped == false
+        uint16_t dropped_count_;  // mDropped == true
+    };
+    const uint8_t log_id_;
+    bool dropped_;
 };
diff --git a/logd/LogBufferTest.cpp b/logd/LogBufferTest.cpp
index 334d57b..e651b4f 100644
--- a/logd/LogBufferTest.cpp
+++ b/logd/LogBufferTest.cpp
@@ -43,14 +43,6 @@
 }
 #endif
 
-void android::prdebug(const char* fmt, ...) {
-    va_list ap;
-    va_start(ap, fmt);
-    vfprintf(stderr, fmt, ap);
-    fprintf(stderr, "\n");
-    va_end(ap);
-}
-
 char* android::uidToName(uid_t) {
     return nullptr;
 }
@@ -119,7 +111,7 @@
         }
     }
 
-    if (diff_index < 10) {
+    if (diff_index < 80) {
         auto expected_short = MakePrintable(expected);
         auto result_short = MakePrintable(result);
         return StringPrintf("msg: expected '%s' vs '%s'", expected_short.c_str(),
@@ -208,8 +200,9 @@
 
     std::vector<LogMessage> read_log_messages;
     std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, nullptr));
-    uint64_t flush_result = log_buffer_->FlushTo(test_writer.get(), 1, nullptr, nullptr);
-    EXPECT_EQ(1ULL, flush_result);
+    std::unique_ptr<FlushToState> flush_to_state = log_buffer_->CreateFlushToState(1, kLogMaskAll);
+    EXPECT_TRUE(log_buffer_->FlushTo(test_writer.get(), *flush_to_state, nullptr));
+    EXPECT_EQ(2ULL, flush_to_state->start());
     CompareLogMessages(log_messages, read_log_messages);
 }
 
@@ -335,4 +328,39 @@
     CompareLogMessages(log_messages, read_log_messages);
 }
 
+TEST_P(LogBufferTest, read_last_sequence) {
+    std::vector<LogMessage> log_messages = {
+            {{.pid = 1, .tid = 2, .sec = 10000, .nsec = 20001, .lid = LOG_ID_MAIN, .uid = 0},
+             "first"},
+            {{.pid = 10, .tid = 2, .sec = 10000, .nsec = 20002, .lid = LOG_ID_MAIN, .uid = 0},
+             "second"},
+            {{.pid = 100, .tid = 2, .sec = 10000, .nsec = 20003, .lid = LOG_ID_MAIN, .uid = 0},
+             "third"},
+    };
+    FixupMessages(&log_messages);
+    LogMessages(log_messages);
+
+    std::vector<LogMessage> read_log_messages;
+    bool released = false;
+
+    {
+        auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
+        std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, &released));
+        std::unique_ptr<LogReaderThread> log_reader(
+                new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(test_writer), true,
+                                    0, ~0, 0, {}, 3, {}));
+        reader_list_.reader_threads().emplace_back(std::move(log_reader));
+    }
+
+    while (!released) {
+        usleep(5000);
+    }
+    {
+        auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
+        EXPECT_EQ(0U, reader_list_.reader_threads().size());
+    }
+    std::vector<LogMessage> expected_log_messages = {log_messages.back()};
+    CompareLogMessages(expected_log_messages, read_log_messages);
+}
+
 INSTANTIATE_TEST_CASE_P(LogBufferTests, LogBufferTest, testing::Values("chatty", "simple"));
diff --git a/logd/LogBufferTest.h b/logd/LogBufferTest.h
index 1659f12..f91a1b5 100644
--- a/logd/LogBufferTest.h
+++ b/logd/LogBufferTest.h
@@ -45,7 +45,7 @@
 class TestWriter : public LogWriter {
   public:
     TestWriter(std::vector<LogMessage>* msgs, bool* released)
-        : LogWriter(0, true, true), msgs_(msgs), released_(released) {}
+        : LogWriter(0, true), msgs_(msgs), released_(released) {}
     bool Write(const logger_entry& entry, const char* message) override {
         msgs_->emplace_back(LogMessage{entry, std::string(message, entry.len), false});
         return true;
diff --git a/logd/LogReader.cpp b/logd/LogReader.cpp
index 35c46aa..f71133d 100644
--- a/logd/LogReader.cpp
+++ b/logd/LogReader.cpp
@@ -23,6 +23,7 @@
 
 #include <chrono>
 
+#include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 #include <cutils/sockets.h>
 #include <private/android_filesystem_config.h>
@@ -45,11 +46,8 @@
 
 class SocketLogWriter : public LogWriter {
   public:
-    SocketLogWriter(LogReader* reader, SocketClient* client, bool privileged,
-                    bool can_read_security_logs)
-        : LogWriter(client->getUid(), privileged, can_read_security_logs),
-          reader_(reader),
-          client_(client) {}
+    SocketLogWriter(LogReader* reader, SocketClient* client, bool privileged)
+        : LogWriter(client->getUid(), privileged), reader_(reader), client_(client) {}
 
     bool Write(const logger_entry& entry, const char* msg) override {
         struct iovec iovec[2];
@@ -162,25 +160,23 @@
 
     bool privileged = clientHasLogCredentials(cli);
     bool can_read_security = CanReadSecurityLogs(cli);
+    if (!can_read_security) {
+        logMask &= ~(1 << LOG_ID_SECURITY);
+    }
 
-    std::unique_ptr<LogWriter> socket_log_writer(
-            new SocketLogWriter(this, cli, privileged, can_read_security));
+    std::unique_ptr<LogWriter> socket_log_writer(new SocketLogWriter(this, cli, privileged));
 
     uint64_t sequence = 1;
     // Convert realtime to sequence number
     if (start != log_time::EPOCH) {
         bool start_time_set = false;
         uint64_t last = sequence;
-        auto log_find_start = [pid, logMask, start, &sequence, &start_time_set, &last](
-                                      log_id_t element_log_id, pid_t element_pid,
-                                      uint64_t element_sequence, log_time element_realtime,
-                                      uint16_t) -> FilterResult {
+        auto log_find_start = [pid, start, &sequence, &start_time_set, &last](
+                                      log_id_t, pid_t element_pid, uint64_t element_sequence,
+                                      log_time element_realtime) -> FilterResult {
             if (pid && pid != element_pid) {
                 return FilterResult::kSkip;
             }
-            if ((logMask & (1 << element_log_id)) == 0) {
-                return FilterResult::kSkip;
-            }
             if (start == element_realtime) {
                 sequence = element_sequence;
                 start_time_set = true;
@@ -195,8 +191,8 @@
             }
             return FilterResult::kSkip;
         };
-
-        log_buffer_->FlushTo(socket_log_writer.get(), sequence, nullptr, log_find_start);
+        auto flush_to_state = log_buffer_->CreateFlushToState(sequence, logMask);
+        log_buffer_->FlushTo(socket_log_writer.get(), *flush_to_state, log_find_start);
 
         if (!start_time_set) {
             if (nonBlock) {
@@ -206,9 +202,9 @@
         }
     }
 
-    android::prdebug(
+    LOG(INFO) << android::base::StringPrintf(
             "logdr: UID=%d GID=%d PID=%d %c tail=%lu logMask=%x pid=%d "
-            "start=%" PRIu64 "ns deadline=%" PRIi64 "ns\n",
+            "start=%" PRIu64 "ns deadline=%" PRIi64 "ns",
             cli->getUid(), cli->getGid(), cli->getPid(), nonBlock ? 'n' : 'b', tail, logMask,
             (int)pid, start.nsec(), static_cast<int64_t>(deadline.time_since_epoch().count()));
 
diff --git a/logd/LogReaderList.cpp b/logd/LogReaderList.cpp
index 220027b..32ba291 100644
--- a/logd/LogReaderList.cpp
+++ b/logd/LogReaderList.cpp
@@ -18,7 +18,7 @@
 
 // When we are notified a new log entry is available, inform
 // listening sockets who are watching this entry's log id.
-void LogReaderList::NotifyNewLog(unsigned int log_mask) const {
+void LogReaderList::NotifyNewLog(LogMask log_mask) const {
     auto lock = std::lock_guard{reader_threads_lock_};
 
     for (const auto& entry : reader_threads_) {
diff --git a/logd/LogReaderList.h b/logd/LogReaderList.h
index 0d84aba..594716a 100644
--- a/logd/LogReaderList.h
+++ b/logd/LogReaderList.h
@@ -20,11 +20,12 @@
 #include <memory>
 #include <mutex>
 
+#include "LogBuffer.h"
 #include "LogReaderThread.h"
 
 class LogReaderList {
   public:
-    void NotifyNewLog(unsigned int log_mask) const;
+    void NotifyNewLog(LogMask log_mask) const;
 
     std::list<std::unique_ptr<LogReaderThread>>& reader_threads() { return reader_threads_; }
     std::mutex& reader_threads_lock() { return reader_threads_lock_; }
diff --git a/logd/LogReaderThread.cpp b/logd/LogReaderThread.cpp
index 3a83f3f..dc8582d 100644
--- a/logd/LogReaderThread.cpp
+++ b/logd/LogReaderThread.cpp
@@ -29,24 +29,21 @@
 
 LogReaderThread::LogReaderThread(LogBuffer* log_buffer, LogReaderList* reader_list,
                                  std::unique_ptr<LogWriter> writer, bool non_block,
-                                 unsigned long tail, unsigned int log_mask, pid_t pid,
+                                 unsigned long tail, LogMask log_mask, pid_t pid,
                                  log_time start_time, uint64_t start,
                                  std::chrono::steady_clock::time_point deadline)
     : log_buffer_(log_buffer),
       reader_list_(reader_list),
       writer_(std::move(writer)),
-      leading_dropped_(false),
-      log_mask_(log_mask),
       pid_(pid),
       tail_(tail),
       count_(0),
       index_(0),
       start_time_(start_time),
-      start_(start),
       deadline_(deadline),
       non_block_(non_block) {
-    memset(last_tid_, 0, sizeof(last_tid_));
     cleanSkip_Locked();
+    flush_to_state_ = log_buffer_->CreateFlushToState(start, log_mask);
     auto thread = std::thread{&LogReaderThread::ThreadFunction, this};
     thread.detach();
 }
@@ -54,12 +51,8 @@
 void LogReaderThread::ThreadFunction() {
     prctl(PR_SET_NAME, "logd.reader.per");
 
-    leading_dropped_ = true;
-
     auto lock = std::unique_lock{reader_list_->reader_threads_lock()};
 
-    uint64_t start = start_;
-
     while (!release_) {
         if (deadline_.time_since_epoch().count() != 0) {
             if (thread_triggered_condition_.wait_until(lock, deadline_) ==
@@ -74,22 +67,19 @@
         lock.unlock();
 
         if (tail_) {
-            log_buffer_->FlushTo(writer_.get(), start, nullptr,
-                                 [this](log_id_t log_id, pid_t pid, uint64_t sequence,
-                                        log_time realtime, uint16_t dropped_count) {
-                                     return FilterFirstPass(log_id, pid, sequence, realtime,
-                                                            dropped_count);
-                                 });
-            leading_dropped_ =
-                    true;  // TODO: Likely a bug, if leading_dropped_ was not true before calling
-                           // flushTo(), then it should not be reset to true after.
+            auto first_pass_state = log_buffer_->CreateFlushToState(flush_to_state_->start(),
+                                                                    flush_to_state_->log_mask());
+            log_buffer_->FlushTo(
+                    writer_.get(), *first_pass_state,
+                    [this](log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime) {
+                        return FilterFirstPass(log_id, pid, sequence, realtime);
+                    });
         }
-        start = log_buffer_->FlushTo(writer_.get(), start, last_tid_,
-                                     [this](log_id_t log_id, pid_t pid, uint64_t sequence,
-                                            log_time realtime, uint16_t dropped_count) {
-                                         return FilterSecondPass(log_id, pid, sequence, realtime,
-                                                                 dropped_count);
-                                     });
+        bool flush_success = log_buffer_->FlushTo(
+                writer_.get(), *flush_to_state_,
+                [this](log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime) {
+                    return FilterSecondPass(log_id, pid, sequence, realtime);
+                });
 
         // We only ignore entries before the original start time for the first flushTo(), if we
         // get entries after this first flush before the original start time, then the client
@@ -102,12 +92,10 @@
 
         lock.lock();
 
-        if (start == LogBuffer::FLUSH_ERROR) {
+        if (!flush_success) {
             break;
         }
 
-        start_ = start + 1;
-
         if (non_block_ || release_) {
             break;
         }
@@ -131,23 +119,10 @@
 }
 
 // A first pass to count the number of elements
-FilterResult LogReaderThread::FilterFirstPass(log_id_t log_id, pid_t pid, uint64_t sequence,
-                                              log_time realtime, uint16_t dropped_count) {
+FilterResult LogReaderThread::FilterFirstPass(log_id_t, pid_t pid, uint64_t, log_time realtime) {
     auto lock = std::lock_guard{reader_list_->reader_threads_lock()};
 
-    if (leading_dropped_) {
-        if (dropped_count) {
-            return FilterResult::kSkip;
-        }
-        leading_dropped_ = false;
-    }
-
-    if (count_ == 0) {
-        start_ = sequence;
-    }
-
-    if ((!pid_ || pid_ == pid) && IsWatching(log_id) &&
-        (start_time_ == log_time::EPOCH || start_time_ <= realtime)) {
+    if ((!pid_ || pid_ == pid) && (start_time_ == log_time::EPOCH || start_time_ <= realtime)) {
         ++count_;
     }
 
@@ -155,33 +130,20 @@
 }
 
 // A second pass to send the selected elements
-FilterResult LogReaderThread::FilterSecondPass(log_id_t log_id, pid_t pid, uint64_t sequence,
-                                               log_time realtime, uint16_t dropped_count) {
+FilterResult LogReaderThread::FilterSecondPass(log_id_t log_id, pid_t pid, uint64_t,
+                                               log_time realtime) {
     auto lock = std::lock_guard{reader_list_->reader_threads_lock()};
 
-    start_ = sequence;
-
     if (skip_ahead_[log_id]) {
         skip_ahead_[log_id]--;
         return FilterResult::kSkip;
     }
 
-    if (leading_dropped_) {
-        if (dropped_count) {
-            return FilterResult::kSkip;
-        }
-        leading_dropped_ = false;
-    }
-
     // Truncate to close race between first and second pass
     if (non_block_ && tail_ && index_ >= count_) {
         return FilterResult::kStop;
     }
 
-    if (!IsWatching(log_id)) {
-        return FilterResult::kSkip;
-    }
-
     if (pid_ && pid_ != pid) {
         return FilterResult::kSkip;
     }
diff --git a/logd/LogReaderThread.h b/logd/LogReaderThread.h
index ba81063..bf70b94 100644
--- a/logd/LogReaderThread.h
+++ b/logd/LogReaderThread.h
@@ -38,7 +38,7 @@
   public:
     LogReaderThread(LogBuffer* log_buffer, LogReaderList* reader_list,
                     std::unique_ptr<LogWriter> writer, bool non_block, unsigned long tail,
-                    unsigned int log_mask, pid_t pid, log_time start_time, uint64_t sequence,
+                    LogMask log_mask, pid_t pid, log_time start_time, uint64_t sequence,
                     std::chrono::steady_clock::time_point deadline);
     void triggerReader_Locked() { thread_triggered_condition_.notify_all(); }
 
@@ -52,20 +52,20 @@
         thread_triggered_condition_.notify_all();
     }
 
-    bool IsWatching(log_id_t id) const { return log_mask_ & (1 << id); }
-    bool IsWatchingMultiple(unsigned int log_mask) const { return log_mask_ & log_mask; }
+    bool IsWatching(log_id_t id) const { return flush_to_state_->log_mask() & (1 << id); }
+    bool IsWatchingMultiple(LogMask log_mask) const {
+        return flush_to_state_->log_mask() & log_mask;
+    }
 
     std::string name() const { return writer_->name(); }
-    uint64_t start() const { return start_; }
+    uint64_t start() const { return flush_to_state_->start(); }
     std::chrono::steady_clock::time_point deadline() const { return deadline_; }
 
   private:
     void ThreadFunction();
     // flushTo filter callbacks
-    FilterResult FilterFirstPass(log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime,
-                                 uint16_t dropped_count);
-    FilterResult FilterSecondPass(log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime,
-                                  uint16_t dropped_count);
+    FilterResult FilterFirstPass(log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime);
+    FilterResult FilterSecondPass(log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime);
 
     std::condition_variable thread_triggered_condition_;
     LogBuffer* log_buffer_;
@@ -74,20 +74,15 @@
 
     // Set to true to cause the thread to end and the LogReaderThread to delete itself.
     bool release_ = false;
-    // Indicates whether or not 'leading' (first logs seen starting from start_) 'dropped' (chatty)
-    // messages should be ignored.
-    bool leading_dropped_;
 
-    // A mask of the logs buffers that are read by this reader.
-    const unsigned int log_mask_;
     // If set to non-zero, only pids equal to this are read by the reader.
     const pid_t pid_;
     // When a reader is referencing (via start_) old elements in the log buffer, and the log
     // buffer's size grows past its memory limit, the log buffer may request the reader to skip
     // ahead a specified number of logs.
     unsigned int skip_ahead_[LOG_ID_MAX];
-    // Used for distinguishing 'dropped' messages for duplicate logs vs chatty drops
-    pid_t last_tid_[LOG_ID_MAX];
+    // LogBuffer::FlushTo() needs to store state across subsequent calls.
+    std::unique_ptr<FlushToState> flush_to_state_;
 
     // These next three variables are used for reading only the most recent lines aka `adb logcat
     // -t` / `adb logcat -T`.
@@ -103,8 +98,6 @@
     // When a reader requests logs starting from a given timestamp, its stored here for the first
     // pass, such that logs before this time stamp that are accumulated in the buffer are ignored.
     log_time start_time_;
-    // The point from which the reader will read logs once awoken.
-    uint64_t start_;
     // CLOCK_MONOTONIC based deadline used for log wrapping.  If this deadline expires before logs
     // wrap, then wake up and send the logs to the reader anyway.
     std::chrono::steady_clock::time_point deadline_;
diff --git a/logd/LogStatistics.cpp b/logd/LogStatistics.cpp
index bb7621d..d49982a 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -29,11 +29,37 @@
 
 #include <private/android_logger.h>
 
+#include "LogBufferElement.h"
+
 static const uint64_t hourSec = 60 * 60;
 static const uint64_t monthSec = 31 * 24 * hourSec;
 
 std::atomic<size_t> LogStatistics::SizesTotal;
 
+static std::string TagNameKey(const LogStatisticsElement& element) {
+    if (IsBinary(element.log_id)) {
+        uint32_t tag = element.tag;
+        if (tag) {
+            const char* cp = android::tagToName(tag);
+            if (cp) {
+                return std::string(cp);
+            }
+        }
+        return android::base::StringPrintf("[%" PRIu32 "]", tag);
+    }
+    const char* msg = element.msg;
+    if (!msg) {
+        return "chatty";
+    }
+    ++msg;
+    uint16_t len = element.msg_len;
+    len = (len <= 1) ? 0 : strnlen(msg, len - 1);
+    if (!len) {
+        return "<NULL>";
+    }
+    return std::string(msg, len);
+}
+
 LogStatistics::LogStatistics(bool enable_statistics) : enable(enable_statistics) {
     log_time now(CLOCK_REALTIME);
     log_id_for_each(id) {
@@ -87,10 +113,10 @@
     ++mElementsTotal[log_id];
 }
 
-void LogStatistics::Add(LogBufferElement* element) {
+void LogStatistics::Add(const LogStatisticsElement& element) {
     auto lock = std::lock_guard{lock_};
-    log_id_t log_id = element->getLogId();
-    uint16_t size = element->getMsgLen();
+    log_id_t log_id = element.log_id;
+    uint16_t size = element.msg_len;
     mSizes[log_id] += size;
     ++mElements[log_id];
 
@@ -99,7 +125,7 @@
     // evaluated and trimmed, thus recording size and number of
     // elements, but we must recognize the manufactured dropped
     // entry as not contributing to the lifetime totals.
-    if (element->getDropped()) {
+    if (element.dropped_count) {
         ++mDroppedElements[log_id];
     } else {
         mSizesTotal[log_id] += size;
@@ -107,7 +133,7 @@
         ++mElementsTotal[log_id];
     }
 
-    log_time stamp(element->getRealTime());
+    log_time stamp(element.realtime);
     if (mNewest[log_id] < stamp) {
         // A major time update invalidates the statistics :-(
         log_time diff = stamp - mNewest[log_id];
@@ -132,111 +158,111 @@
         return;
     }
 
-    uidTable[log_id].add(element->getUid(), element);
-    if (element->getUid() == AID_SYSTEM) {
-        pidSystemTable[log_id].add(element->getPid(), element);
+    uidTable[log_id].Add(element.uid, element);
+    if (element.uid == AID_SYSTEM) {
+        pidSystemTable[log_id].Add(element.pid, element);
     }
 
     if (!enable) {
         return;
     }
 
-    pidTable.add(element->getPid(), element);
-    tidTable.add(element->getTid(), element);
+    pidTable.Add(element.pid, element);
+    tidTable.Add(element.tid, element);
 
-    uint32_t tag = element->getTag();
+    uint32_t tag = element.tag;
     if (tag) {
         if (log_id == LOG_ID_SECURITY) {
-            securityTagTable.add(tag, element);
+            securityTagTable.Add(tag, element);
         } else {
-            tagTable.add(tag, element);
+            tagTable.Add(tag, element);
         }
     }
 
-    if (!element->getDropped()) {
-        tagNameTable.add(TagNameKey(element), element);
+    if (!element.dropped_count) {
+        tagNameTable.Add(TagNameKey(element), element);
     }
 }
 
-void LogStatistics::Subtract(LogBufferElement* element) {
+void LogStatistics::Subtract(const LogStatisticsElement& element) {
     auto lock = std::lock_guard{lock_};
-    log_id_t log_id = element->getLogId();
-    uint16_t size = element->getMsgLen();
+    log_id_t log_id = element.log_id;
+    uint16_t size = element.msg_len;
     mSizes[log_id] -= size;
     --mElements[log_id];
-    if (element->getDropped()) {
+    if (element.dropped_count) {
         --mDroppedElements[log_id];
     }
 
-    if (mOldest[log_id] < element->getRealTime()) {
-        mOldest[log_id] = element->getRealTime();
+    if (mOldest[log_id] < element.realtime) {
+        mOldest[log_id] = element.realtime;
     }
 
     if (log_id == LOG_ID_KERNEL) {
         return;
     }
 
-    uidTable[log_id].subtract(element->getUid(), element);
-    if (element->getUid() == AID_SYSTEM) {
-        pidSystemTable[log_id].subtract(element->getPid(), element);
+    uidTable[log_id].Subtract(element.uid, element);
+    if (element.uid == AID_SYSTEM) {
+        pidSystemTable[log_id].Subtract(element.pid, element);
     }
 
     if (!enable) {
         return;
     }
 
-    pidTable.subtract(element->getPid(), element);
-    tidTable.subtract(element->getTid(), element);
+    pidTable.Subtract(element.pid, element);
+    tidTable.Subtract(element.tid, element);
 
-    uint32_t tag = element->getTag();
+    uint32_t tag = element.tag;
     if (tag) {
         if (log_id == LOG_ID_SECURITY) {
-            securityTagTable.subtract(tag, element);
+            securityTagTable.Subtract(tag, element);
         } else {
-            tagTable.subtract(tag, element);
+            tagTable.Subtract(tag, element);
         }
     }
 
-    if (!element->getDropped()) {
-        tagNameTable.subtract(TagNameKey(element), element);
+    if (!element.dropped_count) {
+        tagNameTable.Subtract(TagNameKey(element), element);
     }
 }
 
 // Atomically set an entry to drop
 // entry->setDropped(1) must follow this call, caller should do this explicitly.
-void LogStatistics::Drop(LogBufferElement* element) {
+void LogStatistics::Drop(const LogStatisticsElement& element) {
     auto lock = std::lock_guard{lock_};
-    log_id_t log_id = element->getLogId();
-    uint16_t size = element->getMsgLen();
+    log_id_t log_id = element.log_id;
+    uint16_t size = element.msg_len;
     mSizes[log_id] -= size;
     ++mDroppedElements[log_id];
 
-    if (mNewestDropped[log_id] < element->getRealTime()) {
-        mNewestDropped[log_id] = element->getRealTime();
+    if (mNewestDropped[log_id] < element.realtime) {
+        mNewestDropped[log_id] = element.realtime;
     }
 
-    uidTable[log_id].drop(element->getUid(), element);
-    if (element->getUid() == AID_SYSTEM) {
-        pidSystemTable[log_id].drop(element->getPid(), element);
+    uidTable[log_id].Drop(element.uid, element);
+    if (element.uid == AID_SYSTEM) {
+        pidSystemTable[log_id].Drop(element.pid, element);
     }
 
     if (!enable) {
         return;
     }
 
-    pidTable.drop(element->getPid(), element);
-    tidTable.drop(element->getTid(), element);
+    pidTable.Drop(element.pid, element);
+    tidTable.Drop(element.tid, element);
 
-    uint32_t tag = element->getTag();
+    uint32_t tag = element.tag;
     if (tag) {
         if (log_id == LOG_ID_SECURITY) {
-            securityTagTable.drop(tag, element);
+            securityTagTable.Drop(tag, element);
         } else {
-            tagTable.drop(tag, element);
+            tagTable.Drop(tag, element);
         }
     }
 
-    tagNameTable.subtract(TagNameKey(element), element);
+    tagNameTable.Subtract(TagNameKey(element), element);
 }
 
 const char* LogStatistics::UidToName(uid_t uid) const {
@@ -283,8 +309,8 @@
          ++it) {
         const PidEntry& entry = it->second;
 
-        if (entry.getUid() == uid) {
-            const char* nameTmp = entry.getName();
+        if (entry.uid() == uid) {
+            const char* nameTmp = entry.name();
 
             if (nameTmp) {
                 if (!name) {
@@ -306,16 +332,17 @@
 void LogStatistics::WorstTwoWithThreshold(const LogHashtable<TKey, TEntry>& table, size_t threshold,
                                           int* worst, size_t* worst_sizes,
                                           size_t* second_worst_sizes) const {
+    std::array<const TKey*, 2> max_keys;
     std::array<const TEntry*, 2> max_entries;
-    table.MaxEntries(AID_ROOT, 0, &max_entries);
+    table.MaxEntries(AID_ROOT, 0, max_keys, max_entries);
     if (max_entries[0] == nullptr || max_entries[1] == nullptr) {
         return;
     }
     *worst_sizes = max_entries[0]->getSizes();
     // b/24782000: Allow time horizon to extend roughly tenfold, assume average entry length is
     // 100 characters.
-    if (*worst_sizes > threshold && *worst_sizes > (10 * max_entries[0]->getDropped())) {
-        *worst = max_entries[0]->getKey();
+    if (*worst_sizes > threshold && *worst_sizes > (10 * max_entries[0]->dropped_count())) {
+        *worst = *max_keys[0];
         *second_worst_sizes = max_entries[1]->getSizes();
         if (*second_worst_sizes < threshold) {
             *second_worst_sizes = threshold;
@@ -338,13 +365,14 @@
 void LogStatistics::WorstTwoSystemPids(log_id id, size_t worst_uid_sizes, int* worst,
                                        size_t* second_worst_sizes) const {
     auto lock = std::lock_guard{lock_};
+    std::array<const pid_t*, 2> max_keys;
     std::array<const PidEntry*, 2> max_entries;
-    pidSystemTable[id].MaxEntries(AID_SYSTEM, 0, &max_entries);
+    pidSystemTable[id].MaxEntries(AID_SYSTEM, 0, max_keys, max_entries);
     if (max_entries[0] == nullptr || max_entries[1] == nullptr) {
         return;
     }
 
-    *worst = max_entries[0]->getKey();
+    *worst = *max_keys[0];
     *second_worst_sizes = worst_uid_sizes - max_entries[0]->getSizes() + max_entries[1]->getSizes();
 }
 
@@ -393,9 +421,8 @@
     if (!nameTmp) nameTmp = allocNameTmp = UidToNameLocked(uid);
     if (nameTmp) {
         size_t lenSpace = std::max(nameLen - name.length(), (size_t)1);
-        size_t len = EntryBaseConstants::total_len -
-                     EntryBaseConstants::pruned_len - size.length() -
-                     name.length() - lenSpace - 2;
+        size_t len = EntryBase::TOTAL_LEN - EntryBase::PRUNED_LEN - size.length() - name.length() -
+                     lenSpace - 2;
         size_t lenNameTmp = strlen(nameTmp);
         while ((len < lenNameTmp) && (lenSpace > 1)) {
             ++len;
@@ -411,8 +438,8 @@
     }
 }
 
-std::string UidEntry::format(const LogStatistics& stat, log_id_t id) const REQUIRES(stat.lock_) {
-    uid_t uid = getUid();
+std::string UidEntry::format(const LogStatistics& stat, log_id_t id, uid_t uid) const
+        REQUIRES(stat.lock_) {
     std::string name = android::base::StringPrintf("%u", uid);
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
@@ -424,7 +451,7 @@
         for (LogStatistics::uidTable_t::const_iterator it =
                  stat.uidTable[id].begin();
              it != stat.uidTable[id].end(); ++it) {
-            totalDropped += it->second.getDropped();
+            totalDropped += it->second.dropped_count();
         }
         size_t sizes = stat.mSizes[id];
         size_t totalSize = stat.mSizesTotal[id];
@@ -434,7 +461,7 @@
         size_t entrySize = getSizes();
         float virtualEntrySize = entrySize;
         int realPermille = virtualEntrySize * 1000.0 / sizes;
-        size_t dropped = getDropped();
+        size_t dropped = dropped_count();
         if (dropped) {
             pruned = android::base::StringPrintf("%zu", dropped);
             virtualEntrySize += (float)dropped * totalSize / totalElements;
@@ -461,8 +488,7 @@
                 change = android::base::StringPrintf(
                     "%s%d%s", prefix, (permille + 5) / 10, units);
             }
-            ssize_t spaces = EntryBaseConstants::pruned_len - 2 -
-                             pruned.length() - change.length();
+            ssize_t spaces = EntryBase::PRUNED_LEN - 2 - pruned.length() - change.length();
             if ((spaces <= 0) && pruned.length()) {
                 spaces = 1;
             }
@@ -480,24 +506,25 @@
     }
 
     static const size_t maximum_sorted_entries = 32;
-    std::array<const PidEntry*, maximum_sorted_entries> sorted;
-    stat.pidSystemTable[id].MaxEntries(uid, 0, &sorted);
+    std::array<const pid_t*, maximum_sorted_entries> sorted_pids;
+    std::array<const PidEntry*, maximum_sorted_entries> sorted_entries;
+    stat.pidSystemTable[id].MaxEntries(uid, 0, sorted_pids, sorted_entries);
 
     std::string byPid;
     size_t index;
     bool hasDropped = false;
     for (index = 0; index < maximum_sorted_entries; ++index) {
-        const PidEntry* entry = sorted[index];
+        const PidEntry* entry = sorted_entries[index];
         if (!entry) {
             break;
         }
         if (entry->getSizes() <= (getSizes() / 100)) {
             break;
         }
-        if (entry->getDropped()) {
+        if (entry->dropped_count()) {
             hasDropped = true;
         }
-        byPid += entry->format(stat, id);
+        byPid += entry->format(stat, id, *sorted_pids[index]);
     }
     if (index > 1) {  // print this only if interesting
         std::string ditto("\" ");
@@ -516,17 +543,15 @@
                       std::string("BYTES"), std::string("NUM"));
 }
 
-std::string PidEntry::format(const LogStatistics& stat, log_id_t /* id */) const
+std::string PidEntry::format(const LogStatistics& stat, log_id_t, pid_t pid) const
         REQUIRES(stat.lock_) {
-    uid_t uid = getUid();
-    pid_t pid = getPid();
-    std::string name = android::base::StringPrintf("%5u/%u", pid, uid);
+    std::string name = android::base::StringPrintf("%5u/%u", pid, uid_);
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
-    stat.FormatTmp(getName(), uid, name, size, 12);
+    stat.FormatTmp(name_, uid_, name, size, 12);
 
     std::string pruned = "";
-    size_t dropped = getDropped();
+    size_t dropped = dropped_count();
     if (dropped) {
         pruned = android::base::StringPrintf("%zu", dropped);
     }
@@ -541,16 +566,15 @@
                       std::string("NUM"));
 }
 
-std::string TidEntry::format(const LogStatistics& stat, log_id_t /* id */) const
+std::string TidEntry::format(const LogStatistics& stat, log_id_t, pid_t tid) const
         REQUIRES(stat.lock_) {
-    uid_t uid = getUid();
-    std::string name = android::base::StringPrintf("%5u/%u", getTid(), uid);
+    std::string name = android::base::StringPrintf("%5u/%u", tid, uid_);
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
-    stat.FormatTmp(getName(), uid, name, size, 12);
+    stat.FormatTmp(name_, uid_, name, size, 12);
 
     std::string pruned = "";
-    size_t dropped = getDropped();
+    size_t dropped = dropped_count();
     if (dropped) {
         pruned = android::base::StringPrintf("%zu", dropped);
     }
@@ -566,16 +590,14 @@
                       std::string("BYTES"), std::string(isprune ? "NUM" : ""));
 }
 
-std::string TagEntry::format(const LogStatistics& /* stat */,
-                             log_id_t /* id */) const {
+std::string TagEntry::format(const LogStatistics&, log_id_t, uint32_t) const {
     std::string name;
-    uid_t uid = getUid();
-    if (uid == (uid_t)-1) {
-        name = android::base::StringPrintf("%7u", getKey());
+    if (uid_ == (uid_t)-1) {
+        name = android::base::StringPrintf("%7u", key());
     } else {
-        name = android::base::StringPrintf("%7u/%u", getKey(), uid);
+        name = android::base::StringPrintf("%7u/%u", key(), uid_);
     }
-    const char* nameTmp = getName();
+    const char* nameTmp = this->name();
     if (nameTmp) {
         name += android::base::StringPrintf(
             "%*s%s", (int)std::max(14 - name.length(), (size_t)1), "", nameTmp);
@@ -584,7 +606,7 @@
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
     std::string pruned = "";
-    size_t dropped = getDropped();
+    size_t dropped = dropped_count();
     if (dropped) {
         pruned = android::base::StringPrintf("%zu", dropped);
     }
@@ -599,37 +621,33 @@
                       std::string("BYTES"), std::string(""));
 }
 
-std::string TagNameEntry::format(const LogStatistics& /* stat */,
-                                 log_id_t /* id */) const {
+std::string TagNameEntry::format(const LogStatistics&, log_id_t,
+                                 const std::string& key_name) const {
     std::string name;
-    pid_t tid = getTid();
-    pid_t pid = getPid();
     std::string pidstr;
-    if (pid != (pid_t)-1) {
-        pidstr = android::base::StringPrintf("%u", pid);
-        if ((tid != (pid_t)-1) && (tid != pid)) pidstr = "/" + pidstr;
+    if (pid_ != (pid_t)-1) {
+        pidstr = android::base::StringPrintf("%u", pid_);
+        if (tid_ != (pid_t)-1 && tid_ != pid_) pidstr = "/" + pidstr;
     }
     int len = 9 - pidstr.length();
     if (len < 0) len = 0;
-    if ((tid == (pid_t)-1) || (tid == pid)) {
+    if (tid_ == (pid_t)-1 || tid_ == pid_) {
         name = android::base::StringPrintf("%*s", len, "");
     } else {
-        name = android::base::StringPrintf("%*u", len, tid);
+        name = android::base::StringPrintf("%*u", len, tid_);
     }
     name += pidstr;
-    uid_t uid = getUid();
-    if (uid != (uid_t)-1) {
-        name += android::base::StringPrintf("/%u", uid);
+    if (uid_ != (uid_t)-1) {
+        name += android::base::StringPrintf("/%u", uid_);
     }
 
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
-    const char* nameTmp = getName();
+    const char* nameTmp = key_name.data();
     if (nameTmp) {
         size_t lenSpace = std::max(16 - name.length(), (size_t)1);
-        size_t len = EntryBaseConstants::total_len -
-                     EntryBaseConstants::pruned_len - size.length() -
-                     name.length() - lenSpace - 2;
+        size_t len = EntryBase::TOTAL_LEN - EntryBase::PRUNED_LEN - size.length() - name.length() -
+                     lenSpace - 2;
         size_t lenNameTmp = strlen(nameTmp);
         while ((len < lenNameTmp) && (lenSpace > 1)) {
             ++len;
@@ -693,15 +711,16 @@
         REQUIRES(lock_) {
     static const size_t maximum_sorted_entries = 32;
     std::string output;
-    std::array<const TEntry*, maximum_sorted_entries> sorted;
-    table.MaxEntries(uid, pid, &sorted);
+    std::array<const TKey*, maximum_sorted_entries> sorted_keys;
+    std::array<const TEntry*, maximum_sorted_entries> sorted_entries;
+    table.MaxEntries(uid, pid, sorted_keys, sorted_entries);
     bool header_printed = false;
     for (size_t index = 0; index < maximum_sorted_entries; ++index) {
-        const TEntry* entry = sorted[index];
+        const TEntry* entry = sorted_entries[index];
         if (!entry) {
             break;
         }
-        if (entry->getSizes() <= (sorted[0]->getSizes() / 100)) {
+        if (entry->getSizes() <= (sorted_entries[0]->getSizes() / 100)) {
             break;
         }
         if (!header_printed) {
@@ -709,7 +728,7 @@
             output += entry->formatHeader(name, id);
             header_printed = true;
         }
-        output += entry->format(*this, id);
+        output += entry->format(*this, id, *sorted_keys[index]);
     }
     return output;
 }
@@ -944,7 +963,7 @@
 
 uid_t LogStatistics::PidToUid(pid_t pid) {
     auto lock = std::lock_guard{lock_};
-    return pidTable.add(pid)->second.getUid();
+    return pidTable.Add(pid)->second.uid();
 }
 
 // caller must free character string
@@ -952,7 +971,7 @@
     auto lock = std::lock_guard{lock_};
     // An inconvenient truth ... getName() can alter the object
     pidTable_t& writablePidTable = const_cast<pidTable_t&>(pidTable);
-    const char* name = writablePidTable.add(pid)->second.getName();
+    const char* name = writablePidTable.Add(pid)->second.name();
     if (!name) {
         return nullptr;
     }
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index 7d13ff7..200c228 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -38,13 +38,26 @@
 #include <private/android_filesystem_config.h>
 #include <utils/FastStrcmp.h>
 
-#include "LogBufferElement.h"
 #include "LogUtils.h"
 
 #define log_id_for_each(i) \
     for (log_id_t i = LOG_ID_MIN; (i) < LOG_ID_MAX; (i) = (log_id_t)((i) + 1))
 
 class LogStatistics;
+class UidEntry;
+class PidEntry;
+
+struct LogStatisticsElement {
+    uid_t uid;
+    pid_t pid;
+    pid_t tid;
+    uint32_t tag;
+    log_time realtime;
+    const char* msg;
+    uint16_t msg_len;
+    uint16_t dropped_count;
+    log_id_t log_id;
+};
 
 template <typename TKey, typename TEntry>
 class LogHashtable {
@@ -65,7 +78,7 @@
     static const size_t unordered_map_per_entry_overhead = sizeof(void*);
     static const size_t unordered_map_bucket_overhead = sizeof(void*);
 
-   public:
+  public:
     size_t size() const {
         return map.size();
     }
@@ -84,124 +97,108 @@
     // Returns a sorted array of up to len highest entries sorted by size.  If fewer than len
     // entries are found, their positions are set to nullptr.
     template <size_t len>
-    void MaxEntries(uid_t uid, pid_t pid, std::array<const TEntry*, len>* out) const {
-        auto& retval = *out;
-        retval.fill(nullptr);
-        for (const_iterator it = map.begin(); it != map.end(); ++it) {
-            const TEntry& entry = it->second;
-
-            if ((uid != AID_ROOT) && (uid != entry.getUid())) {
+    void MaxEntries(uid_t uid, pid_t pid, std::array<const TKey*, len>& out_keys,
+                    std::array<const TEntry*, len>& out_entries) const {
+        out_keys.fill(nullptr);
+        out_entries.fill(nullptr);
+        for (const auto& [key, entry] : map) {
+            uid_t entry_uid = 0;
+            if constexpr (std::is_same_v<TEntry, UidEntry>) {
+                entry_uid = key;
+            } else {
+                entry_uid = entry.uid();
+            }
+            if (uid != AID_ROOT && uid != entry_uid) {
                 continue;
             }
-            if (pid && entry.getPid() && (pid != entry.getPid())) {
+            pid_t entry_pid = 0;
+            if constexpr (std::is_same_v<TEntry, PidEntry>) {
+                entry_pid = key;
+            } else {
+                entry_pid = entry.pid();
+            }
+            if (pid && entry_pid && pid != entry_pid) {
                 continue;
             }
 
             size_t sizes = entry.getSizes();
             ssize_t index = len - 1;
-            while ((!retval[index] || (sizes > retval[index]->getSizes())) &&
-                   (--index >= 0))
+            while ((!out_entries[index] || sizes > out_entries[index]->getSizes()) && --index >= 0)
                 ;
             if (++index < (ssize_t)len) {
                 size_t num = len - index - 1;
                 if (num) {
-                    memmove(&retval[index + 1], &retval[index],
-                            num * sizeof(retval[0]));
+                    memmove(&out_keys[index + 1], &out_keys[index], num * sizeof(out_keys[0]));
+                    memmove(&out_entries[index + 1], &out_entries[index],
+                            num * sizeof(out_entries[0]));
                 }
-                retval[index] = &entry;
+                out_keys[index] = &key;
+                out_entries[index] = &entry;
             }
         }
     }
 
-    inline iterator add(const TKey& key, const LogBufferElement* element) {
+    iterator Add(const TKey& key, const LogStatisticsElement& element) {
         iterator it = map.find(key);
         if (it == map.end()) {
             it = map.insert(std::make_pair(key, TEntry(element))).first;
         } else {
-            it->second.add(element);
+            it->second.Add(element);
         }
         return it;
     }
 
-    inline iterator add(TKey key) {
+    iterator Add(const TKey& key) {
         iterator it = map.find(key);
         if (it == map.end()) {
             it = map.insert(std::make_pair(key, TEntry(key))).first;
         } else {
-            it->second.add(key);
+            it->second.Add(key);
         }
         return it;
     }
 
-    void subtract(TKey&& key, const LogBufferElement* element) {
-        iterator it = map.find(std::move(key));
-        if ((it != map.end()) && it->second.subtract(element)) {
-            map.erase(it);
-        }
-    }
-
-    void subtract(const TKey& key, const LogBufferElement* element) {
+    void Subtract(const TKey& key, const LogStatisticsElement& element) {
         iterator it = map.find(key);
-        if ((it != map.end()) && it->second.subtract(element)) {
+        if (it != map.end() && it->second.Subtract(element)) {
             map.erase(it);
         }
     }
 
-    inline void drop(TKey key, const LogBufferElement* element) {
+    void Drop(const TKey& key, const LogStatisticsElement& element) {
         iterator it = map.find(key);
         if (it != map.end()) {
-            it->second.drop(element);
+            it->second.Drop(element);
         }
     }
 
-    inline iterator begin() {
-        return map.begin();
-    }
-    inline const_iterator begin() const {
-        return map.begin();
-    }
-    inline iterator end() {
-        return map.end();
-    }
-    inline const_iterator end() const {
-        return map.end();
-    }
+    iterator begin() { return map.begin(); }
+    const_iterator begin() const { return map.begin(); }
+    iterator end() { return map.end(); }
+    const_iterator end() const { return map.end(); }
 };
 
-namespace EntryBaseConstants {
-static constexpr size_t pruned_len = 14;
-static constexpr size_t total_len = 80;
-}
+class EntryBase {
+  public:
+    EntryBase() : size_(0) {}
+    explicit EntryBase(const LogStatisticsElement& element) : size_(element.msg_len) {}
 
-struct EntryBase {
-    size_t size;
+    size_t getSizes() const { return size_; }
 
-    EntryBase() : size(0) {
-    }
-    explicit EntryBase(const LogBufferElement* element)
-        : size(element->getMsgLen()) {
+    void Add(const LogStatisticsElement& element) { size_ += element.msg_len; }
+    bool Subtract(const LogStatisticsElement& element) {
+        size_ -= element.msg_len;
+        return !size_;
     }
 
-    size_t getSizes() const {
-        return size;
-    }
-
-    inline void add(const LogBufferElement* element) {
-        size += element->getMsgLen();
-    }
-    inline bool subtract(const LogBufferElement* element) {
-        size -= element->getMsgLen();
-        return !size;
-    }
+    static constexpr size_t PRUNED_LEN = 14;
+    static constexpr size_t TOTAL_LEN = 80;
 
     static std::string formatLine(const std::string& name,
                                   const std::string& size,
                                   const std::string& pruned) {
-        ssize_t drop_len =
-            std::max(pruned.length() + 1, EntryBaseConstants::pruned_len);
-        ssize_t size_len =
-            std::max(size.length() + 1, EntryBaseConstants::total_len -
-                                            name.length() - drop_len - 1);
+        ssize_t drop_len = std::max(pruned.length() + 1, PRUNED_LEN);
+        ssize_t size_len = std::max(size.length() + 1, TOTAL_LEN - name.length() - drop_len - 1);
 
         std::string ret = android::base::StringPrintf(
             "%s%*s%*s", name.c_str(), (int)size_len, size.c_str(),
@@ -213,388 +210,224 @@
         if (len) ret.erase(pos + 1, len);
         return ret + "\n";
     }
+
+  private:
+    size_t size_;
 };
 
-struct EntryBaseDropped : public EntryBase {
-    size_t dropped;
+class EntryBaseDropped : public EntryBase {
+  public:
+    EntryBaseDropped() : dropped_(0) {}
+    explicit EntryBaseDropped(const LogStatisticsElement& element)
+        : EntryBase(element), dropped_(element.dropped_count) {}
 
-    EntryBaseDropped() : dropped(0) {
+    size_t dropped_count() const { return dropped_; }
+
+    void Add(const LogStatisticsElement& element) {
+        dropped_ += element.dropped_count;
+        EntryBase::Add(element);
     }
-    explicit EntryBaseDropped(const LogBufferElement* element)
-        : EntryBase(element), dropped(element->getDropped()) {
+    bool Subtract(const LogStatisticsElement& element) {
+        dropped_ -= element.dropped_count;
+        return EntryBase::Subtract(element) && !dropped_;
+    }
+    void Drop(const LogStatisticsElement& element) {
+        dropped_ += 1;
+        EntryBase::Subtract(element);
     }
 
-    size_t getDropped() const {
-        return dropped;
-    }
-
-    inline void add(const LogBufferElement* element) {
-        dropped += element->getDropped();
-        EntryBase::add(element);
-    }
-    inline bool subtract(const LogBufferElement* element) {
-        dropped -= element->getDropped();
-        return EntryBase::subtract(element) && !dropped;
-    }
-    inline void drop(const LogBufferElement* element) {
-        dropped += 1;
-        EntryBase::subtract(element);
-    }
+  private:
+    size_t dropped_;
 };
 
-struct UidEntry : public EntryBaseDropped {
-    const uid_t uid;
-    pid_t pid;
+class UidEntry : public EntryBaseDropped {
+  public:
+    explicit UidEntry(const LogStatisticsElement& element)
+        : EntryBaseDropped(element), pid_(element.pid) {}
 
-    explicit UidEntry(const LogBufferElement* element)
-        : EntryBaseDropped(element),
-          uid(element->getUid()),
-          pid(element->getPid()) {
-    }
+    pid_t pid() const { return pid_; }
 
-    inline const uid_t& getKey() const {
-        return uid;
-    }
-    inline const uid_t& getUid() const {
-        return getKey();
-    }
-    inline const pid_t& getPid() const {
-        return pid;
-    }
-
-    inline void add(const LogBufferElement* element) {
-        if (pid != element->getPid()) {
-            pid = -1;
+    void Add(const LogStatisticsElement& element) {
+        if (pid_ != element.pid) {
+            pid_ = -1;
         }
-        EntryBaseDropped::add(element);
+        EntryBaseDropped::Add(element);
     }
 
     std::string formatHeader(const std::string& name, log_id_t id) const;
-    std::string format(const LogStatistics& stat, log_id_t id) const;
+    std::string format(const LogStatistics& stat, log_id_t id, uid_t uid) const;
+
+  private:
+    pid_t pid_;
 };
 
 namespace android {
 uid_t pidToUid(pid_t pid);
 }
 
-struct PidEntry : public EntryBaseDropped {
-    const pid_t pid;
-    uid_t uid;
-    char* name;
-
+class PidEntry : public EntryBaseDropped {
+  public:
     explicit PidEntry(pid_t pid)
         : EntryBaseDropped(),
-          pid(pid),
-          uid(android::pidToUid(pid)),
-          name(android::pidToName(pid)) {
-    }
-    explicit PidEntry(const LogBufferElement* element)
-        : EntryBaseDropped(element),
-          pid(element->getPid()),
-          uid(element->getUid()),
-          name(android::pidToName(pid)) {
-    }
+          uid_(android::pidToUid(pid)),
+          name_(android::pidToName(pid)) {}
+    explicit PidEntry(const LogStatisticsElement& element)
+        : EntryBaseDropped(element), uid_(element.uid), name_(android::pidToName(element.pid)) {}
     PidEntry(const PidEntry& element)
         : EntryBaseDropped(element),
-          pid(element.pid),
-          uid(element.uid),
-          name(element.name ? strdup(element.name) : nullptr) {
-    }
-    ~PidEntry() {
-        free(name);
-    }
+          uid_(element.uid_),
+          name_(element.name_ ? strdup(element.name_) : nullptr) {}
+    ~PidEntry() { free(name_); }
 
-    const pid_t& getKey() const {
-        return pid;
-    }
-    const pid_t& getPid() const {
-        return getKey();
-    }
-    const uid_t& getUid() const {
-        return uid;
-    }
-    const char* getName() const {
-        return name;
-    }
+    uid_t uid() const { return uid_; }
+    const char* name() const { return name_; }
 
-    inline void add(pid_t newPid) {
-        if (name && !fastcmp<strncmp>(name, "zygote", 6)) {
-            free(name);
-            name = nullptr;
+    void Add(pid_t new_pid) {
+        if (name_ && !fastcmp<strncmp>(name_, "zygote", 6)) {
+            free(name_);
+            name_ = nullptr;
         }
-        if (!name) {
-            name = android::pidToName(newPid);
+        if (!name_) {
+            name_ = android::pidToName(new_pid);
         }
     }
 
-    inline void add(const LogBufferElement* element) {
-        uid_t incomingUid = element->getUid();
-        if (getUid() != incomingUid) {
-            uid = incomingUid;
-            free(name);
-            name = android::pidToName(element->getPid());
+    void Add(const LogStatisticsElement& element) {
+        uid_t incoming_uid = element.uid;
+        if (uid() != incoming_uid) {
+            uid_ = incoming_uid;
+            free(name_);
+            name_ = android::pidToName(element.pid);
         } else {
-            add(element->getPid());
+            Add(element.pid);
         }
-        EntryBaseDropped::add(element);
+        EntryBaseDropped::Add(element);
     }
 
     std::string formatHeader(const std::string& name, log_id_t id) const;
-    std::string format(const LogStatistics& stat, log_id_t id) const;
+    std::string format(const LogStatistics& stat, log_id_t id, pid_t pid) const;
+
+  private:
+    uid_t uid_;
+    char* name_;
 };
 
-struct TidEntry : public EntryBaseDropped {
-    const pid_t tid;
-    pid_t pid;
-    uid_t uid;
-    char* name;
-
+class TidEntry : public EntryBaseDropped {
+  public:
     TidEntry(pid_t tid, pid_t pid)
         : EntryBaseDropped(),
-          tid(tid),
-          pid(pid),
-          uid(android::pidToUid(tid)),
-          name(android::tidToName(tid)) {
-    }
-    explicit TidEntry(const LogBufferElement* element)
+          pid_(pid),
+          uid_(android::pidToUid(tid)),
+          name_(android::tidToName(tid)) {}
+    explicit TidEntry(const LogStatisticsElement& element)
         : EntryBaseDropped(element),
-          tid(element->getTid()),
-          pid(element->getPid()),
-          uid(element->getUid()),
-          name(android::tidToName(tid)) {
-    }
+          pid_(element.pid),
+          uid_(element.uid),
+          name_(android::tidToName(element.tid)) {}
     TidEntry(const TidEntry& element)
         : EntryBaseDropped(element),
-          tid(element.tid),
-          pid(element.pid),
-          uid(element.uid),
-          name(element.name ? strdup(element.name) : nullptr) {
-    }
-    ~TidEntry() {
-        free(name);
-    }
+          pid_(element.pid_),
+          uid_(element.uid_),
+          name_(element.name_ ? strdup(element.name_) : nullptr) {}
+    ~TidEntry() { free(name_); }
 
-    const pid_t& getKey() const {
-        return tid;
-    }
-    const pid_t& getTid() const {
-        return getKey();
-    }
-    const pid_t& getPid() const {
-        return pid;
-    }
-    const uid_t& getUid() const {
-        return uid;
-    }
-    const char* getName() const {
-        return name;
-    }
+    pid_t pid() const { return pid_; }
+    uid_t uid() const { return uid_; }
+    const char* name() const { return name_; }
 
-    inline void add(pid_t incomingTid) {
-        if (name && !fastcmp<strncmp>(name, "zygote", 6)) {
-            free(name);
-            name = nullptr;
+    void Add(pid_t incomingTid) {
+        if (name_ && !fastcmp<strncmp>(name_, "zygote", 6)) {
+            free(name_);
+            name_ = nullptr;
         }
-        if (!name) {
-            name = android::tidToName(incomingTid);
+        if (!name_) {
+            name_ = android::tidToName(incomingTid);
         }
     }
 
-    inline void add(const LogBufferElement* element) {
-        uid_t incomingUid = element->getUid();
-        pid_t incomingPid = element->getPid();
-        if ((getUid() != incomingUid) || (getPid() != incomingPid)) {
-            uid = incomingUid;
-            pid = incomingPid;
-            free(name);
-            name = android::tidToName(element->getTid());
+    void Add(const LogStatisticsElement& element) {
+        uid_t incoming_uid = element.uid;
+        pid_t incoming_pid = element.pid;
+        if (uid() != incoming_uid || pid() != incoming_pid) {
+            uid_ = incoming_uid;
+            pid_ = incoming_pid;
+            free(name_);
+            name_ = android::tidToName(element.tid);
         } else {
-            add(element->getTid());
+            Add(element.tid);
         }
-        EntryBaseDropped::add(element);
+        EntryBaseDropped::Add(element);
     }
 
     std::string formatHeader(const std::string& name, log_id_t id) const;
-    std::string format(const LogStatistics& stat, log_id_t id) const;
+    std::string format(const LogStatistics& stat, log_id_t id, pid_t pid) const;
+
+  private:
+    pid_t pid_;
+    uid_t uid_;
+    char* name_;
 };
 
-struct TagEntry : public EntryBaseDropped {
-    const uint32_t tag;
-    pid_t pid;
-    uid_t uid;
+class TagEntry : public EntryBaseDropped {
+  public:
+    explicit TagEntry(const LogStatisticsElement& element)
+        : EntryBaseDropped(element), tag_(element.tag), pid_(element.pid), uid_(element.uid) {}
 
-    explicit TagEntry(const LogBufferElement* element)
-        : EntryBaseDropped(element),
-          tag(element->getTag()),
-          pid(element->getPid()),
-          uid(element->getUid()) {
-    }
+    uint32_t key() const { return tag_; }
+    pid_t pid() const { return pid_; }
+    uid_t uid() const { return uid_; }
+    const char* name() const { return android::tagToName(tag_); }
 
-    const uint32_t& getKey() const {
-        return tag;
-    }
-    const pid_t& getPid() const {
-        return pid;
-    }
-    const uid_t& getUid() const {
-        return uid;
-    }
-    const char* getName() const {
-        return android::tagToName(tag);
-    }
-
-    inline void add(const LogBufferElement* element) {
-        if (uid != element->getUid()) {
-            uid = -1;
+    void Add(const LogStatisticsElement& element) {
+        if (uid_ != element.uid) {
+            uid_ = -1;
         }
-        if (pid != element->getPid()) {
-            pid = -1;
+        if (pid_ != element.pid) {
+            pid_ = -1;
         }
-        EntryBaseDropped::add(element);
+        EntryBaseDropped::Add(element);
     }
 
     std::string formatHeader(const std::string& name, log_id_t id) const;
-    std::string format(const LogStatistics& stat, log_id_t id) const;
+    std::string format(const LogStatistics& stat, log_id_t id, uint32_t) const;
+
+  private:
+    const uint32_t tag_;
+    pid_t pid_;
+    uid_t uid_;
 };
 
-struct TagNameKey {
-    std::string* alloc;
-    std::string_view name;  // Saves space if const char*
+class TagNameEntry : public EntryBase {
+  public:
+    explicit TagNameEntry(const LogStatisticsElement& element)
+        : EntryBase(element), tid_(element.tid), pid_(element.pid), uid_(element.uid) {}
 
-    explicit TagNameKey(const LogBufferElement* element)
-        : alloc(nullptr), name("", strlen("")) {
-        if (element->isBinary()) {
-            uint32_t tag = element->getTag();
-            if (tag) {
-                const char* cp = android::tagToName(tag);
-                if (cp) {
-                    name = std::string_view(cp, strlen(cp));
-                    return;
-                }
-            }
-            alloc = new std::string(
-                android::base::StringPrintf("[%" PRIu32 "]", tag));
-            if (!alloc) return;
-            name = std::string_view(alloc->c_str(), alloc->size());
-            return;
+    pid_t tid() const { return tid_; }
+    pid_t pid() const { return pid_; }
+    uid_t uid() const { return uid_; }
+
+    void Add(const LogStatisticsElement& element) {
+        if (uid_ != element.uid) {
+            uid_ = -1;
         }
-        const char* msg = element->getMsg();
-        if (!msg) {
-            name = std::string_view("chatty", strlen("chatty"));
-            return;
+        if (pid_ != element.pid) {
+            pid_ = -1;
         }
-        ++msg;
-        uint16_t len = element->getMsgLen();
-        len = (len <= 1) ? 0 : strnlen(msg, len - 1);
-        if (!len) {
-            name = std::string_view("<NULL>", strlen("<NULL>"));
-            return;
+        if (tid_ != element.tid) {
+            tid_ = -1;
         }
-        alloc = new std::string(msg, len);
-        if (!alloc) return;
-        name = std::string_view(alloc->c_str(), alloc->size());
-    }
-
-    explicit TagNameKey(TagNameKey&& rval) noexcept
-        : alloc(rval.alloc), name(rval.name.data(), rval.name.length()) {
-        rval.alloc = nullptr;
-    }
-
-    explicit TagNameKey(const TagNameKey& rval)
-        : alloc(rval.alloc ? new std::string(*rval.alloc) : nullptr),
-          name(alloc ? alloc->data() : rval.name.data(), rval.name.length()) {
-    }
-
-    ~TagNameKey() {
-        if (alloc) delete alloc;
-    }
-
-    operator const std::string_view() const {
-        return name;
-    }
-
-    const char* data() const {
-        return name.data();
-    }
-    size_t length() const {
-        return name.length();
-    }
-
-    bool operator==(const TagNameKey& rval) const {
-        if (length() != rval.length()) return false;
-        if (length() == 0) return true;
-        return fastcmp<strncmp>(data(), rval.data(), length()) == 0;
-    }
-    bool operator!=(const TagNameKey& rval) const {
-        return !(*this == rval);
-    }
-
-    size_t getAllocLength() const {
-        return alloc ? alloc->length() + 1 + sizeof(std::string) : 0;
-    }
-};
-
-// Hash for TagNameKey
-template <>
-struct std::hash<TagNameKey>
-    : public std::unary_function<const TagNameKey&, size_t> {
-    size_t operator()(const TagNameKey& __t) const noexcept {
-        if (!__t.length()) return 0;
-        return std::hash<std::string_view>()(std::string_view(__t));
-    }
-};
-
-struct TagNameEntry : public EntryBase {
-    pid_t tid;
-    pid_t pid;
-    uid_t uid;
-    TagNameKey name;
-
-    explicit TagNameEntry(const LogBufferElement* element)
-        : EntryBase(element),
-          tid(element->getTid()),
-          pid(element->getPid()),
-          uid(element->getUid()),
-          name(element) {
-    }
-
-    const TagNameKey& getKey() const {
-        return name;
-    }
-    const pid_t& getTid() const {
-        return tid;
-    }
-    const pid_t& getPid() const {
-        return pid;
-    }
-    const uid_t& getUid() const {
-        return uid;
-    }
-    const char* getName() const {
-        return name.data();
-    }
-    size_t getNameAllocLength() const {
-        return name.getAllocLength();
-    }
-
-    inline void add(const LogBufferElement* element) {
-        if (uid != element->getUid()) {
-            uid = -1;
-        }
-        if (pid != element->getPid()) {
-            pid = -1;
-        }
-        if (tid != element->getTid()) {
-            tid = -1;
-        }
-        EntryBase::add(element);
+        EntryBase::Add(element);
     }
 
     std::string formatHeader(const std::string& name, log_id_t id) const;
-    std::string format(const LogStatistics& stat, log_id_t id) const;
+    std::string format(const LogStatistics& stat, log_id_t id, const std::string& key_name) const;
+
+  private:
+    pid_t tid_;
+    pid_t pid_;
+    uid_t uid_;
 };
 
-// Log Statistics
 class LogStatistics {
     friend UidEntry;
     friend PidEntry;
@@ -635,7 +468,7 @@
     tagTable_t securityTagTable GUARDED_BY(lock_);
 
     // global tag list
-    typedef LogHashtable<TagNameKey, TagNameEntry> tagNameTable_t;
+    typedef LogHashtable<std::string, TagNameEntry> tagNameTable_t;
     tagNameTable_t tagNameTable;
 
     size_t sizeOf() const REQUIRES(lock_) {
@@ -645,20 +478,28 @@
                       (pidTable.size() * sizeof(pidTable_t::iterator)) +
                       (tagTable.size() * sizeof(tagTable_t::iterator));
         for (auto it : pidTable) {
-            const char* name = it.second.getName();
+            const char* name = it.second.name();
             if (name) size += strlen(name) + 1;
         }
         for (auto it : tidTable) {
-            const char* name = it.second.getName();
+            const char* name = it.second.name();
             if (name) size += strlen(name) + 1;
         }
-        for (auto it : tagNameTable) size += it.second.getNameAllocLength();
+        for (auto it : tagNameTable) {
+            size += sizeof(std::string);
+            size_t len = it.first.size();
+            // Account for short string optimization: if the string's length is <= 22 bytes for 64
+            // bit or <= 10 bytes for 32 bit, then there is no additional allocation.
+            if ((sizeof(std::string) == 24 && len > 22) ||
+                (sizeof(std::string) != 24 && len > 10)) {
+                size += len;
+            }
+        }
         log_id_for_each(id) {
             size += uidTable[id].sizeOf();
             size += uidTable[id].size() * sizeof(uidTable_t::iterator);
             size += pidSystemTable[id].sizeOf();
-            size +=
-                pidSystemTable[id].size() * sizeof(pidSystemTable_t::iterator);
+            size += pidSystemTable[id].size() * sizeof(pidSystemTable_t::iterator);
         }
         return size;
     }
@@ -667,14 +508,14 @@
     LogStatistics(bool enable_statistics);
 
     void AddTotal(log_id_t log_id, uint16_t size) EXCLUDES(lock_);
-    void Add(LogBufferElement* entry) EXCLUDES(lock_);
-    void Subtract(LogBufferElement* entry) EXCLUDES(lock_);
+    void Add(const LogStatisticsElement& entry) EXCLUDES(lock_);
+    void Subtract(const LogStatisticsElement& entry) EXCLUDES(lock_);
     // entry->setDropped(1) must follow this call
-    void Drop(LogBufferElement* entry) EXCLUDES(lock_);
+    void Drop(const LogStatisticsElement& entry) EXCLUDES(lock_);
     // Correct for coalescing two entries referencing dropped content
-    void Erase(LogBufferElement* element) EXCLUDES(lock_) {
+    void Erase(const LogStatisticsElement& element) EXCLUDES(lock_) {
         auto lock = std::lock_guard{lock_};
-        log_id_t log_id = element->getLogId();
+        log_id_t log_id = element.log_id;
         --mElements[log_id];
         --mDroppedElements[log_id];
     }
diff --git a/logd/LogTags.cpp b/logd/LogTags.cpp
index 3afe3ee..8e18f9d 100644
--- a/logd/LogTags.cpp
+++ b/logd/LogTags.cpp
@@ -29,6 +29,7 @@
 #include <string>
 
 #include <android-base/file.h>
+#include <android-base/logging.h>
 #include <android-base/macros.h>
 #include <android-base/scopeguard.h>
 #include <android-base/stringprintf.h>
@@ -115,10 +116,11 @@
     }
 
     if (warn) {
-        android::prdebug(
-            ((fd < 0) ? "%s failed to rebuild"
-                      : "%s missing, damaged or truncated; rebuilt"),
-            filename);
+        if (fd < 0) {
+            LOG(ERROR) << filename << " failed to rebuild";
+        } else {
+            LOG(ERROR) << filename << " missing, damaged or truncated; rebuilt";
+        }
     }
 
     if (fd >= 0) {
@@ -182,8 +184,7 @@
         WritePersistEventLogTags(tag, uid, source);
     } else if (warn && !newOne && source) {
         // For the files, we want to report dupes.
-        android::prdebug("Multiple tag %" PRIu32 " %s %s %s", tag, Name.c_str(),
-                         Format.c_str(), source);
+        LOG(DEBUG) << "Multiple tag " << tag << " " << Name << " " << Format << " " << source;
     }
 }
 
@@ -216,7 +217,7 @@
                 } else if (isdigit(*cp)) {
                     unsigned long Tag = strtoul(cp, &cp, 10);
                     if (warn && (Tag > emptyTag)) {
-                        android::prdebug("tag too large %lu", Tag);
+                        LOG(WARNING) << "tag too large " << Tag;
                     }
                     while ((cp < endp) && (*cp != '\n') && isspace(*cp)) ++cp;
                     if (cp >= endp) break;
@@ -231,9 +232,8 @@
                     std::string Name(name, cp - name);
 #ifdef ALLOW_NOISY_LOGGING_OF_PROBLEM_WITH_LOTS_OF_TECHNICAL_DEBT
                     static const size_t maximum_official_tag_name_size = 24;
-                    if (warn &&
-                        (Name.length() > maximum_official_tag_name_size)) {
-                        android::prdebug("tag name too long %s", Name.c_str());
+                    if (warn && (Name.length() > maximum_official_tag_name_size)) {
+                        LOG(WARNING) << "tag name too long " << Name;
                     }
 #endif
                     if (hasAlpha &&
@@ -264,8 +264,8 @@
                                         filename, warn);
                     } else {
                         if (warn) {
-                            android::prdebug("tag name invalid %.*s",
-                                             (int)(cp - name + 1), name);
+                            LOG(ERROR) << android::base::StringPrintf("tag name invalid %.*s",
+                                                                      (int)(cp - name + 1), name);
                         }
                         lineStart = nullptr;
                     }
@@ -276,7 +276,7 @@
             cp++;
         }
     } else if (warn) {
-        android::prdebug("Cannot read %s", filename);
+        LOG(ERROR) << "Cannot read " << filename;
     }
 }
 
@@ -479,8 +479,8 @@
 
 static int openFile(const char* name, int mode, bool warning) {
     int fd = TEMP_FAILURE_RETRY(open(name, mode));
-    if ((fd < 0) && warning) {
-        android::prdebug("Failed open %s (%d)", name, errno);
+    if (fd < 0 && warning) {
+        PLOG(ERROR) << "Failed to open " << name;
     }
     return fd;
 }
diff --git a/logd/LogUtils.h b/logd/LogUtils.h
index c472167..df78a50 100644
--- a/logd/LogUtils.h
+++ b/logd/LogUtils.h
@@ -30,7 +30,6 @@
 
 // Furnished in main.cpp. Caller must own and free returned value
 char* uidToName(uid_t uid);
-void prdebug(const char* fmt, ...) __attribute__((__format__(printf, 1, 2)));
 
 // Caller must own and free returned value
 char* pidToName(pid_t pid);
@@ -60,6 +59,20 @@
 }
 }
 
+// Returns true if the log buffer is meant for binary logs.
+static inline bool IsBinary(log_id_t log_id) {
+    return log_id == LOG_ID_EVENTS || log_id == LOG_ID_STATS || log_id == LOG_ID_SECURITY;
+}
+
+// Returns the numeric log tag for binary log messages.
+static inline uint32_t MsgToTag(const char* msg, uint16_t msg_len) {
+    if (msg_len < sizeof(android_event_header_t)) {
+        return 0;
+    }
+
+    return reinterpret_cast<const android_event_header_t*>(msg)->tag;
+}
+
 static inline bool worstUidEnabledForLogid(log_id_t id) {
     return (id == LOG_ID_MAIN) || (id == LOG_ID_SYSTEM) ||
            (id == LOG_ID_RADIO) || (id == LOG_ID_EVENTS);
diff --git a/logd/LogWhiteBlackList.h b/logd/LogWhiteBlackList.h
index 0e4e837..447ab87 100644
--- a/logd/LogWhiteBlackList.h
+++ b/logd/LogWhiteBlackList.h
@@ -43,9 +43,7 @@
         return mPid;
     }
 
-    int cmp(LogBufferElement* e) const {
-        return cmp(e->getUid(), e->getPid());
-    }
+    int cmp(LogBufferElement* e) const { return cmp(e->uid(), e->pid()); }
 
     std::string format();
 };
diff --git a/logd/LogWriter.h b/logd/LogWriter.h
index b6c5b67..d43c604 100644
--- a/logd/LogWriter.h
+++ b/logd/LogWriter.h
@@ -23,8 +23,7 @@
 // An interface for writing logs to a reader.
 class LogWriter {
   public:
-    LogWriter(uid_t uid, bool privileged, bool can_read_security_logs)
-        : uid_(uid), privileged_(privileged), can_read_security_logs_(can_read_security_logs) {}
+    LogWriter(uid_t uid, bool privileged) : uid_(uid), privileged_(privileged) {}
     virtual ~LogWriter() {}
 
     virtual bool Write(const logger_entry& entry, const char* msg) = 0;
@@ -35,12 +34,10 @@
     uid_t uid() const { return uid_; }
 
     bool privileged() const { return privileged_; }
-    bool can_read_security_logs() const { return can_read_security_logs_; }
 
   private:
     uid_t uid_;
 
     // If this writer sees logs from all UIDs or only its own UID.  See clientHasLogCredentials().
     bool privileged_;
-    bool can_read_security_logs_;  // If this writer sees security logs.  See CanReadSecurityLogs().
 };
\ No newline at end of file
diff --git a/logd/SimpleLogBuffer.cpp b/logd/SimpleLogBuffer.cpp
index 8a11b92..292a7e4 100644
--- a/logd/SimpleLogBuffer.cpp
+++ b/logd/SimpleLogBuffer.cpp
@@ -16,6 +16,8 @@
 
 #include "SimpleLogBuffer.h"
 
+#include <android-base/logging.h>
+
 #include "LogBufferElement.h"
 
 SimpleLogBuffer::SimpleLogBuffer(LogReaderList* reader_list, LogTags* tags, LogStatistics* stats)
@@ -44,7 +46,7 @@
     if (oldest_[log_id]) {
         it = *oldest_[log_id];
     }
-    while (it != logs().end() && it->getLogId() != log_id) {
+    while (it != logs().end() && it->log_id() != log_id) {
         it++;
     }
     if (it != logs().end()) {
@@ -61,11 +63,8 @@
     int prio = ANDROID_LOG_INFO;
     const char* tag = nullptr;
     size_t tag_len = 0;
-    if (log_id == LOG_ID_EVENTS || log_id == LOG_ID_STATS) {
-        if (len < sizeof(android_event_header_t)) {
-            return false;
-        }
-        int32_t numeric_tag = reinterpret_cast<const android_event_header_t*>(msg)->tag;
+    if (IsBinary(log_id)) {
+        int32_t numeric_tag = MsgToTag(msg, len);
         tag = tags_->tagToName(numeric_tag);
         if (tag) {
             tag_len = strlen(tag);
@@ -102,22 +101,46 @@
 }
 
 void SimpleLogBuffer::LogInternal(LogBufferElement&& elem) {
-    log_id_t log_id = elem.getLogId();
+    log_id_t log_id = elem.log_id();
 
     logs_.emplace_back(std::move(elem));
-    stats_->Add(&logs_.back());
+    stats_->Add(logs_.back().ToLogStatisticsElement());
     MaybePrune(log_id);
     reader_list_->NotifyNewLog(1 << log_id);
 }
 
-uint64_t SimpleLogBuffer::FlushTo(
-        LogWriter* writer, uint64_t start, pid_t* last_tid,
+// These extra parameters are only required for chatty, but since they're a no-op for
+// SimpleLogBuffer, it's easier to include them here, then to duplicate FlushTo() for
+// ChattyLogBuffer.
+class ChattyFlushToState : public FlushToState {
+  public:
+    ChattyFlushToState(uint64_t start, LogMask log_mask) : FlushToState(start, log_mask) {}
+
+    pid_t* last_tid() { return last_tid_; }
+
+    bool drop_chatty_messages() const { return drop_chatty_messages_; }
+    void set_drop_chatty_messages(bool value) { drop_chatty_messages_ = value; }
+
+  private:
+    pid_t last_tid_[LOG_ID_MAX] = {};
+    bool drop_chatty_messages_ = true;
+};
+
+std::unique_ptr<FlushToState> SimpleLogBuffer::CreateFlushToState(uint64_t start,
+                                                                  LogMask log_mask) {
+    return std::make_unique<ChattyFlushToState>(start, log_mask);
+}
+
+bool SimpleLogBuffer::FlushTo(
+        LogWriter* writer, FlushToState& abstract_state,
         const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
-                                         log_time realtime, uint16_t dropped_count)>& filter) {
+                                         log_time realtime)>& filter) {
     auto shared_lock = SharedLock{lock_};
 
+    auto& state = reinterpret_cast<ChattyFlushToState&>(abstract_state);
+
     std::list<LogBufferElement>::iterator it;
-    if (start <= 1) {
+    if (state.start() <= 1) {
         // client wants to start from the beginning
         it = logs_.begin();
     } else {
@@ -126,29 +149,31 @@
         for (it = logs_.end(); it != logs_.begin();
              /* do nothing */) {
             --it;
-            if (it->getSequence() <= start) {
+            if (it->sequence() == state.start()) {
+                break;
+            } else if (it->sequence() < state.start()) {
                 it++;
                 break;
             }
         }
     }
 
-    uint64_t curr = start;
-
     for (; it != logs_.end(); ++it) {
         LogBufferElement& element = *it;
 
-        if (!writer->privileged() && element.getUid() != writer->uid()) {
+        state.set_start(element.sequence());
+
+        if (!writer->privileged() && element.uid() != writer->uid()) {
             continue;
         }
 
-        if (!writer->can_read_security_logs() && element.getLogId() == LOG_ID_SECURITY) {
+        if (((1 << element.log_id()) & state.log_mask()) == 0) {
             continue;
         }
 
         if (filter) {
-            FilterResult ret = filter(element.getLogId(), element.getPid(), element.getSequence(),
-                                      element.getRealTime(), element.getDropped());
+            FilterResult ret =
+                    filter(element.log_id(), element.pid(), element.sequence(), element.realtime());
             if (ret == FilterResult::kSkip) {
                 continue;
             }
@@ -157,31 +182,34 @@
             }
         }
 
-        bool same_tid = false;
-        if (last_tid) {
-            same_tid = last_tid[element.getLogId()] == element.getTid();
-            // Dropped (chatty) immediately following a valid log from the
-            // same source in the same log buffer indicates we have a
-            // multiple identical squash.  chatty that differs source
-            // is due to spam filter.  chatty to chatty of different
-            // source is also due to spam filter.
-            last_tid[element.getLogId()] =
-                    (element.getDropped() && !same_tid) ? 0 : element.getTid();
+        // drop_chatty_messages is initialized to true, so if the first message that we attempt to
+        // flush is a chatty message, we drop it.  Once we see a non-chatty message it gets set to
+        // false to let further chatty messages be printed.
+        if (state.drop_chatty_messages()) {
+            if (element.dropped_count() != 0) {
+                continue;
+            }
+            state.set_drop_chatty_messages(false);
         }
 
+        bool same_tid = state.last_tid()[element.log_id()] == element.tid();
+        // Dropped (chatty) immediately following a valid log from the same source in the same log
+        // buffer indicates we have a multiple identical squash.  chatty that differs source is due
+        // to spam filter.  chatty to chatty of different source is also due to spam filter.
+        state.last_tid()[element.log_id()] =
+                (element.dropped_count() && !same_tid) ? 0 : element.tid();
+
         shared_lock.unlock();
-
         // We never prune logs equal to or newer than any LogReaderThreads' `start` value, so the
         // `element` pointer is safe here without the lock
-        curr = element.getSequence();
         if (!element.FlushTo(writer, stats_, same_tid)) {
-            return FLUSH_ERROR;
+            return false;
         }
-
         shared_lock.lock_shared();
     }
 
-    return curr;
+    state.set_start(state.start() + 1);
+    return true;
 }
 
 // clear all rows of type "id" from the buffer.
@@ -206,8 +234,8 @@
                 auto reader_threads_lock = std::lock_guard{reader_list_->reader_threads_lock()};
                 for (const auto& reader_thread : reader_list_->reader_threads()) {
                     if (reader_thread->IsWatching(id)) {
-                        android::prdebug("Kicking blocked reader, %s, from LogBuffer::clear()\n",
-                                         reader_thread->name().c_str());
+                        LOG(WARNING) << "Kicking blocked reader, " << reader_thread->name()
+                                     << ", from LogBuffer::clear()";
                         reader_thread->release_Locked();
                     }
                 }
@@ -273,22 +301,22 @@
     while (it != logs_.end()) {
         LogBufferElement& element = *it;
 
-        if (element.getLogId() != id) {
+        if (element.log_id() != id) {
             ++it;
             continue;
         }
 
-        if (caller_uid != 0 && element.getUid() != caller_uid) {
+        if (caller_uid != 0 && element.uid() != caller_uid) {
             ++it;
             continue;
         }
 
-        if (oldest && oldest->start() <= element.getSequence()) {
+        if (oldest && oldest->start() <= element.sequence()) {
             KickReader(oldest, id, prune_rows);
             return true;
         }
 
-        stats_->Subtract(&element);
+        stats_->Subtract(element.ToLogStatisticsElement());
         it = Erase(it);
         if (--prune_rows == 0) {
             return false;
@@ -324,16 +352,16 @@
     if (stats_->Sizes(id) > (2 * max_size_[id])) {  // +100%
         // A misbehaving or slow reader has its connection
         // dropped if we hit too much memory pressure.
-        android::prdebug("Kicking blocked reader, %s, from LogBuffer::kickMe()\n",
-                         reader->name().c_str());
+        LOG(WARNING) << "Kicking blocked reader, " << reader->name()
+                     << ", from LogBuffer::kickMe()";
         reader->release_Locked();
     } else if (reader->deadline().time_since_epoch().count() != 0) {
         // Allow a blocked WRAP deadline reader to trigger and start reporting the log data.
         reader->triggerReader_Locked();
     } else {
         // tell slow reader to skip entries to catch up
-        android::prdebug("Skipping %lu entries from slow reader, %s, from LogBuffer::kickMe()\n",
-                         prune_rows, reader->name().c_str());
+        LOG(WARNING) << "Skipping " << prune_rows << " entries from slow reader, " << reader->name()
+                     << ", from LogBuffer::kickMe()";
         reader->triggerSkip_Locked(id, prune_rows);
     }
 }
diff --git a/logd/SimpleLogBuffer.h b/logd/SimpleLogBuffer.h
index 72d26b0..2172507 100644
--- a/logd/SimpleLogBuffer.h
+++ b/logd/SimpleLogBuffer.h
@@ -35,10 +35,10 @@
 
     int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, const char* msg,
             uint16_t len) override;
-    uint64_t FlushTo(LogWriter* writer, uint64_t start, pid_t* lastTid,
-                     const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
-                                                      log_time realtime, uint16_t dropped_count)>&
-                             filter) override;
+    std::unique_ptr<FlushToState> CreateFlushToState(uint64_t start, LogMask log_mask) override;
+    bool FlushTo(LogWriter* writer, FlushToState& state,
+                 const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
+                                                  log_time realtime)>& filter) override;
 
     bool Clear(log_id_t id, uid_t uid) override;
     unsigned long GetSize(log_id_t id) override;
diff --git a/logd/fuzz/log_buffer_log_fuzzer.cpp b/logd/fuzz/log_buffer_log_fuzzer.cpp
index 8f90f50..b576ddf 100644
--- a/logd/fuzz/log_buffer_log_fuzzer.cpp
+++ b/logd/fuzz/log_buffer_log_fuzzer.cpp
@@ -79,13 +79,6 @@
     return 1;
 }
 
-// Because system/core/logd/main.cpp redefines these.
-void prdebug(char const* fmt, ...) {
-    va_list ap;
-    va_start(ap, fmt);
-    vfprintf(stderr, fmt, ap);
-    va_end(ap);
-}
 char* uidToName(uid_t) {
     return strdup("fake");
 }
diff --git a/logd/main.cpp b/logd/main.cpp
index c2b5a1d..773ffb8 100644
--- a/logd/main.cpp
+++ b/logd/main.cpp
@@ -36,7 +36,9 @@
 
 #include <memory>
 
+#include <android-base/logging.h>
 #include <android-base/macros.h>
+#include <android-base/stringprintf.h>
 #include <cutils/android_get_control_file.h>
 #include <cutils/sockets.h>
 #include <log/event_tag_map.h>
@@ -70,19 +72,18 @@
     sched_param param = {};
 
     if (set_sched_policy(0, SP_BACKGROUND) < 0) {
-        android::prdebug("failed to set background scheduling policy");
+        PLOG(ERROR) << "failed to set background scheduling policy";
         return -1;
     }
 
     if (sched_setscheduler((pid_t)0, SCHED_BATCH, &param) < 0) {
-        android::prdebug("failed to set batch scheduler");
+        PLOG(ERROR) << "failed to set batch scheduler";
         return -1;
     }
 
-    if (!__android_logger_property_get_bool("ro.debuggable",
-                                            BOOL_DEFAULT_FALSE) &&
+    if (!__android_logger_property_get_bool("ro.debuggable", BOOL_DEFAULT_FALSE) &&
         prctl(PR_SET_DUMPABLE, 0) == -1) {
-        android::prdebug("failed to clear PR_SET_DUMPABLE");
+        PLOG(ERROR) << "failed to clear PR_SET_DUMPABLE";
         return -1;
     }
 
@@ -105,40 +106,13 @@
         return -1;
     }
     if (cap_set_proc(caps.get()) < 0) {
-        android::prdebug("failed to set CAP_SYSLOG or CAP_AUDIT_CONTROL (%d)", errno);
+        PLOG(ERROR) << "failed to set CAP_SYSLOG or CAP_AUDIT_CONTROL";
         return -1;
     }
 
     return 0;
 }
 
-static int fdDmesg = -1;
-void android::prdebug(const char* fmt, ...) {
-    if (fdDmesg < 0) {
-        return;
-    }
-
-    static const char message[] = {
-        KMSG_PRIORITY(LOG_DEBUG), 'l', 'o', 'g', 'd', ':', ' '
-    };
-    char buffer[256];
-    memcpy(buffer, message, sizeof(message));
-
-    va_list ap;
-    va_start(ap, fmt);
-    int n = vsnprintf(buffer + sizeof(message),
-                      sizeof(buffer) - sizeof(message), fmt, ap);
-    va_end(ap);
-    if (n > 0) {
-        buffer[sizeof(buffer) - 1] = '\0';
-        if (!strchr(buffer, '\n')) {
-            buffer[sizeof(buffer) - 2] = '\0';
-            strlcat(buffer, "\n", sizeof(buffer));
-        }
-        write(fdDmesg, buffer, strlen(buffer));
-    }
-}
-
 char* android::uidToName(uid_t u) {
     struct Userdata {
         uid_t uid;
@@ -246,8 +220,20 @@
         return issueReinit();
     }
 
+    android::base::InitLogging(
+            argv, [](android::base::LogId log_id, android::base::LogSeverity severity,
+                     const char* tag, const char* file, unsigned int line, const char* message) {
+                if (tag && strcmp(tag, "logd") != 0) {
+                    auto prefixed_message = android::base::StringPrintf("%s: %s", tag, message);
+                    android::base::KernelLogger(log_id, severity, "logd", file, line,
+                                                prefixed_message.c_str());
+                } else {
+                    android::base::KernelLogger(log_id, severity, "logd", file, line, message);
+                }
+            });
+
     static const char dev_kmsg[] = "/dev/kmsg";
-    fdDmesg = android_get_control_file(dev_kmsg);
+    int fdDmesg = android_get_control_file(dev_kmsg);
     if (fdDmesg < 0) {
         fdDmesg = TEMP_FAILURE_RETRY(open(dev_kmsg, O_WRONLY | O_CLOEXEC));
     }
@@ -263,7 +249,7 @@
             fdPmesg = TEMP_FAILURE_RETRY(
                 open(proc_kmsg, O_RDONLY | O_NDELAY | O_CLOEXEC));
         }
-        if (fdPmesg < 0) android::prdebug("Failed to open %s\n", proc_kmsg);
+        if (fdPmesg < 0) PLOG(ERROR) << "Failed to open " << proc_kmsg;
     }
 
     bool auditd = __android_logger_property_get_bool("ro.logd.auditd", BOOL_DEFAULT_TRUE);
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 00a58bf..427ac4b 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -162,7 +162,7 @@
     chmod 0664 /dev/blkio/tasks
     chmod 0664 /dev/blkio/background/tasks
     write /dev/blkio/blkio.weight 1000
-    write /dev/blkio/background/blkio.weight 500
+    write /dev/blkio/background/blkio.weight 200
     write /dev/blkio/blkio.group_idle 0
     write /dev/blkio/background/blkio.group_idle 0