diff --git a/fastboot/device/usb_client.cpp b/fastboot/device/usb_client.cpp
index 9c80765..c653167 100644
--- a/fastboot/device/usb_client.cpp
+++ b/fastboot/device/usb_client.cpp
@@ -146,7 +146,7 @@
                 },
 };
 
-#define STR_INTERFACE_ "fastboot"
+#define STR_INTERFACE_ "fastbootd"
 
 static const struct {
     struct usb_functionfs_strings_head header;
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 7f6e723..7abc936 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -258,6 +258,10 @@
 static int list_devices_callback(usb_ifc_info* info) {
     if (match_fastboot_with_serial(info, nullptr) == 0) {
         std::string serial = info->serial_number;
+        std::string interface = info->interface;
+        if (interface.empty()) {
+            interface = "fastboot";
+        }
         if (!info->writable) {
             serial = UsbNoPermissionsShortHelpText();
         }
@@ -266,9 +270,9 @@
         }
         // output compatible with "adb devices"
         if (!g_long_listing) {
-            printf("%s\tfastboot", serial.c_str());
+            printf("%s\t%s", serial.c_str(), interface.c_str());
         } else {
-            printf("%-22s fastboot", serial.c_str());
+            printf("%-22s %s", serial.c_str(), interface.c_str());
             if (strlen(info->device_path) > 0) printf(" %s", info->device_path);
         }
         putchar('\n');
diff --git a/fastboot/usb.h b/fastboot/usb.h
index 7ca44c4..e5f56e2 100644
--- a/fastboot/usb.h
+++ b/fastboot/usb.h
@@ -50,6 +50,8 @@
 
     char serial_number[256];
     char device_path[256];
+
+    char interface[256];
 };
 
 class UsbTransport : public Transport {
diff --git a/fastboot/usb_linux.cpp b/fastboot/usb_linux.cpp
index 6363aa5..964488c 100644
--- a/fastboot/usb_linux.cpp
+++ b/fastboot/usb_linux.cpp
@@ -43,6 +43,8 @@
 #include <linux/version.h>
 #include <linux/usb/ch9.h>
 
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
 #include <chrono>
 #include <memory>
 #include <thread>
@@ -263,6 +265,13 @@
         info.has_bulk_in = (in != -1);
         info.has_bulk_out = (out != -1);
 
+        std::string interface;
+        auto path = android::base::StringPrintf("/sys/bus/usb/devices/%s/%s:1.%d/interface",
+                                                sysfs_name, sysfs_name, ifc->bInterfaceNumber);
+        if (android::base::ReadFileToString(path, &interface)) {
+            snprintf(info.interface, sizeof(info.interface), "%s", interface.c_str());
+        }
+
         if(callback(&info) == 0) {
             *ept_in_id = in;
             *ept_out_id = out;
diff --git a/fastboot/usb_osx.cpp b/fastboot/usb_osx.cpp
index 8a3c213..610eebf 100644
--- a/fastboot/usb_osx.cpp
+++ b/fastboot/usb_osx.cpp
@@ -368,6 +368,7 @@
         // device has no serial number
         handle->info.serial_number[0] = 0;
     }
+    handle->info.interface[0] = 0;
     handle->info.writable = 1;
 
     if (try_interfaces(dev, handle)) {
diff --git a/fastboot/usb_windows.cpp b/fastboot/usb_windows.cpp
index bf840f8..67bf8a3 100644
--- a/fastboot/usb_windows.cpp
+++ b/fastboot/usb_windows.cpp
@@ -319,6 +319,7 @@
                     &serial_number_len, true)) {
         info.serial_number[0] = 0;
     }
+    info.interface[0] = 0;
 
     info.device_path[0] = 0;
 
diff --git a/fs_mgr/libdm/dm.cpp b/fs_mgr/libdm/dm.cpp
index 673e145..7912688 100644
--- a/fs_mgr/libdm/dm.cpp
+++ b/fs_mgr/libdm/dm.cpp
@@ -29,6 +29,7 @@
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/macros.h>
+#include <android-base/properties.h>
 #include <android-base/strings.h>
 #include <uuid/uuid.h>
 
@@ -140,6 +141,10 @@
     return std::string{uuid_chars};
 }
 
+static bool IsRecovery() {
+    return access("/system/bin/recovery", F_OK) == 0;
+}
+
 bool DeviceMapper::CreateDevice(const std::string& name, const DmTable& table, std::string* path,
                                 const std::chrono::milliseconds& timeout_ms) {
     std::string uuid = GenerateUuid();
@@ -160,6 +165,16 @@
     if (timeout_ms <= std::chrono::milliseconds::zero()) {
         return true;
     }
+
+    if (IsRecovery()) {
+        bool non_ab_device = android::base::GetProperty("ro.build.ab_update", "").empty();
+        int sdk = android::base::GetIntProperty("ro.build.version.sdk", 0);
+        if (non_ab_device && sdk && sdk <= 29) {
+            LOG(INFO) << "Detected ueventd incompatibility, reverting to legacy libdm behavior.";
+            unique_path = *path;
+        }
+    }
+
     if (!WaitForFile(unique_path, timeout_ms)) {
         LOG(ERROR) << "Failed waiting for device path: " << unique_path;
         DeleteDevice(name);
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/libutils/Android.bp b/libutils/Android.bp
index 0f7044a..ea39d34 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -246,6 +246,7 @@
         "String8_test.cpp",
         "String16_test.cpp",
         "StrongPointer_test.cpp",
+        "Timers_test.cpp",
         "Unicode_test.cpp",
         "Vector_test.cpp",
     ],
diff --git a/libutils/Timers.cpp b/libutils/Timers.cpp
index 1172ae7..fd3f4a9 100644
--- a/libutils/Timers.cpp
+++ b/libutils/Timers.cpp
@@ -20,31 +20,37 @@
 #include <utils/Timers.h>
 
 #include <limits.h>
+#include <stdlib.h>
 #include <time.h>
 
-// host linux support requires Linux 2.6.39+
+#include <android-base/macros.h>
+
+static constexpr size_t clock_id_max = 5;
+
+static void checkClockId(int clock) {
+    if (clock < 0 || clock >= clock_id_max) abort();
+}
+
 #if defined(__linux__)
-nsecs_t systemTime(int clock)
-{
-    static const clockid_t clocks[] = {
-            CLOCK_REALTIME,
-            CLOCK_MONOTONIC,
-            CLOCK_PROCESS_CPUTIME_ID,
-            CLOCK_THREAD_CPUTIME_ID,
-            CLOCK_BOOTTIME
-    };
-    struct timespec t;
-    t.tv_sec = t.tv_nsec = 0;
+nsecs_t systemTime(int clock) {
+    checkClockId(clock);
+    static constexpr clockid_t clocks[] = {CLOCK_REALTIME, CLOCK_MONOTONIC,
+                                           CLOCK_PROCESS_CPUTIME_ID, CLOCK_THREAD_CPUTIME_ID,
+                                           CLOCK_BOOTTIME};
+    static_assert(clock_id_max == arraysize(clocks));
+    timespec t = {};
     clock_gettime(clocks[clock], &t);
     return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
 }
 #else
-nsecs_t systemTime(int /*clock*/)
-{
+nsecs_t systemTime(int clock) {
+    // TODO: is this ever called with anything but REALTIME on mac/windows?
+    checkClockId(clock);
+
     // Clock support varies widely across hosts. Mac OS doesn't support
-    // CLOCK_BOOTTIME, and Windows is windows.
-    struct timeval t;
-    t.tv_sec = t.tv_usec = 0;
+    // CLOCK_BOOTTIME (and doesn't even have clock_gettime until 10.12).
+    // Windows is windows.
+    timeval t = {};
     gettimeofday(&t, nullptr);
     return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
 }
diff --git a/libutils/Timers_test.cpp b/libutils/Timers_test.cpp
new file mode 100644
index 0000000..ec0051e
--- /dev/null
+++ b/libutils/Timers_test.cpp
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <utils/Timers.h>
+
+#include <gtest/gtest.h>
+
+TEST(Timers, systemTime_invalid) {
+    EXPECT_EXIT(systemTime(-1), testing::KilledBySignal(SIGABRT), "");
+    systemTime(SYSTEM_TIME_REALTIME);
+    systemTime(SYSTEM_TIME_MONOTONIC);
+    systemTime(SYSTEM_TIME_PROCESS);
+    systemTime(SYSTEM_TIME_THREAD);
+    systemTime(SYSTEM_TIME_BOOTTIME);
+    EXPECT_EXIT(systemTime(SYSTEM_TIME_BOOTTIME + 1), testing::KilledBySignal(SIGABRT), "");
+}
diff --git a/libutils/include/utils/Timers.h b/libutils/include/utils/Timers.h
index 54ec474..197fc26 100644
--- a/libutils/include/utils/Timers.h
+++ b/libutils/include/utils/Timers.h
@@ -14,11 +14,7 @@
  * limitations under the License.
  */
 
-//
-// Timer functions.
-//
-#ifndef _LIBS_UTILS_TIMERS_H
-#define _LIBS_UTILS_TIMERS_H
+#pragma once
 
 #include <stdint.h>
 #include <sys/types.h>
@@ -77,11 +73,11 @@
 static CONSTEXPR inline nsecs_t microseconds(nsecs_t v) { return us2ns(v); }
 
 enum {
-    SYSTEM_TIME_REALTIME = 0,  // system-wide realtime clock
-    SYSTEM_TIME_MONOTONIC = 1, // monotonic time since unspecified starting point
-    SYSTEM_TIME_PROCESS = 2,   // high-resolution per-process clock
-    SYSTEM_TIME_THREAD = 3,    // high-resolution per-thread clock
-    SYSTEM_TIME_BOOTTIME = 4   // same as SYSTEM_TIME_MONOTONIC, but including CPU suspend time
+    SYSTEM_TIME_REALTIME = 0,   // system-wide realtime clock
+    SYSTEM_TIME_MONOTONIC = 1,  // monotonic time since unspecified starting point
+    SYSTEM_TIME_PROCESS = 2,    // high-resolution per-process clock
+    SYSTEM_TIME_THREAD = 3,     // high-resolution per-thread clock
+    SYSTEM_TIME_BOOTTIME = 4,   // same as SYSTEM_TIME_MONOTONIC, but including CPU suspend time
 };
 
 // return the system-time according to the specified clock
@@ -104,5 +100,3 @@
 #ifdef __cplusplus
 } // extern "C"
 #endif
-
-#endif // _LIBS_UTILS_TIMERS_H
diff --git a/logd/ChattyLogBuffer.cpp b/logd/ChattyLogBuffer.cpp
index 0ba6025..c2e89fc 100644
--- a/logd/ChattyLogBuffer.cpp
+++ b/logd/ChattyLogBuffer.cpp
@@ -48,38 +48,33 @@
 
 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 (last.IsBinary() && 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 +100,11 @@
 
 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 +114,12 @@
     }
 
     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 +141,10 @@
     // 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 +153,22 @@
             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 +176,13 @@
 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 +190,10 @@
     }
 
     {  // 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 +201,13 @@
 
 #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);
     } else {
-        stats()->Subtract(&element);
+        stats()->Subtract(element);
     }
 
     it = SimpleLogBuffer::Erase(it);
@@ -245,15 +238,15 @@
 
   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 +254,18 @@
     }
 
     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 +352,12 @@
         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 +375,7 @@
     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 +438,19 @@
         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 +463,8 @@
                 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 +483,25 @@
                     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 +511,14 @@
                 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 +527,21 @@
 
             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);
+                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 +570,18 @@
     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 +598,12 @@
         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..8754b88 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 +202,4 @@
     CompareLogMessages(expected_log_messages, read_log_messages);
 };
 
-INSTANTIATE_TEST_CASE_P(ChattyLogBufferTests, ChattyLogBufferTest, testing::Values("chatty"));
\ No newline at end of file
+INSTANTIATE_TEST_CASE_P(ChattyLogBufferTests, ChattyLogBufferTest, testing::Values("chatty"));
diff --git a/logd/LogBuffer.h b/logd/LogBuffer.h
index 7f1e128..a3ac683 100644
--- a/logd/LogBuffer.h
+++ b/logd/LogBuffer.h
@@ -21,13 +21,32 @@
 #include <functional>
 
 #include <log/log.h>
-#include <sysutils/SocketClient.h>
+#include <log/log_read.h>
 
-#include "LogBufferElement.h"
+#include "LogWriter.h"
 
-class LogWriter;
+// 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;
 
-enum class FlushToResult {
+// 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,
     kWrite,
@@ -41,18 +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<FlushToResult(const LogBufferElement* element)>& 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,
+                                                          uint16_t dropped_count)>& 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..172a757 100644
--- a/logd/LogBufferElement.cpp
+++ b/logd/LogBufferElement.cpp
@@ -32,92 +32,92 @@
 
 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()) {
         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)) {
+    if (msg_len_ < sizeof(android_event_header_t)) {
         return 0;
     }
 
-    return reinterpret_cast<const android_event_header_t*>(mMsg)->tag;
+    return reinterpret_cast<const android_event_header_t*>(msg_)->tag;
 }
 
-uint16_t LogBufferElement::setDropped(uint16_t value) {
-    if (mDropped) {
-        return mDroppedCount = value;
+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 +165,8 @@
     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 +176,13 @@
     }
 
     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 +214,11 @@
     }
     // 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()) {
         hdrLen = sizeof(android_log_event_string_t);
     } else {
         hdrLen = 1 + sizeof(tag);
@@ -233,7 +232,7 @@
     }
 
     size_t retval = hdrLen + len;
-    if (isBinary()) {
+    if (IsBinary()) {
         android_log_event_string_t* event =
             reinterpret_cast<android_log_event_string_t*>(buffer);
 
@@ -246,9 +245,8 @@
         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 +257,22 @@
     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..5b13e32 100644
--- a/logd/LogBufferElement.h
+++ b/logd/LogBufferElement.h
@@ -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);
-    }
+    bool IsBinary() const { return (log_id_ == LOG_ID_EVENTS) || (log_id_ == 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);
+
+    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..bc01c80 100644
--- a/logd/LogBufferTest.cpp
+++ b/logd/LogBufferTest.cpp
@@ -208,8 +208,9 @@
 
     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 +336,39 @@
     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 234ddc7..44bafb9 100644
--- a/logd/LogReader.cpp
+++ b/logd/LogReader.cpp
@@ -45,11 +45,8 @@
 
 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];
@@ -162,39 +159,39 @@
 
     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](const LogBufferElement* element) -> FlushToResult {
-            if (pid && pid != element->getPid()) {
-                return FlushToResult::kSkip;
+        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, uint16_t) -> FilterResult {
+            if (pid && pid != element_pid) {
+                return FilterResult::kSkip;
             }
-            if ((logMask & (1 << element->getLogId())) == 0) {
-                return FlushToResult::kSkip;
-            }
-            if (start == element->getRealTime()) {
-                sequence = element->getSequence();
+            if (start == element_realtime) {
+                sequence = element_sequence;
                 start_time_set = true;
-                return FlushToResult::kStop;
+                return FilterResult::kStop;
             } else {
-                if (start < element->getRealTime()) {
+                if (start < element_realtime) {
                     sequence = last;
                     start_time_set = true;
-                    return FlushToResult::kStop;
+                    return FilterResult::kStop;
                 }
-                last = element->getSequence();
+                last = element_sequence;
             }
-            return FlushToResult::kSkip;
+            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) {
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 b2001b5..c6e60fe 100644
--- a/logd/LogReaderThread.cpp
+++ b/logd/LogReaderThread.cpp
@@ -29,24 +29,22 @@
 
 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();
 }
@@ -58,8 +56,6 @@
 
     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_) ==
@@ -74,14 +70,24 @@
         lock.unlock();
 
         if (tail_) {
-            log_buffer_->FlushTo(writer_.get(), start, nullptr,
-                                 std::bind(&LogReaderThread::FilterFirstPass, this, _1));
+            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, 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.
         }
-        start = log_buffer_->FlushTo(writer_.get(), start, last_tid_,
-                                     std::bind(&LogReaderThread::FilterSecondPass, this, _1));
+        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,
+                       uint16_t dropped_count) {
+                    return FilterSecondPass(log_id, pid, sequence, realtime, dropped_count);
+                });
 
         // 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
@@ -94,12 +100,10 @@
 
         lock.lock();
 
-        if (start == LogBuffer::FLUSH_ERROR) {
+        if (!flush_success) {
             break;
         }
 
-        start_ = start + 1;
-
         if (non_block_ || release_) {
             break;
         }
@@ -123,65 +127,56 @@
 }
 
 // A first pass to count the number of elements
-FlushToResult LogReaderThread::FilterFirstPass(const LogBufferElement* element) {
+FilterResult LogReaderThread::FilterFirstPass(log_id_t, pid_t pid, uint64_t, log_time realtime,
+                                              uint16_t dropped_count) {
     auto lock = std::lock_guard{reader_list_->reader_threads_lock()};
 
     if (leading_dropped_) {
-        if (element->getDropped()) {
-            return FlushToResult::kSkip;
+        if (dropped_count) {
+            return FilterResult::kSkip;
         }
         leading_dropped_ = false;
     }
 
-    if (count_ == 0) {
-        start_ = element->getSequence();
-    }
-
-    if ((!pid_ || pid_ == element->getPid()) && IsWatching(element->getLogId()) &&
-        (start_time_ == log_time::EPOCH || start_time_ <= element->getRealTime())) {
+    if ((!pid_ || pid_ == pid) && (start_time_ == log_time::EPOCH || start_time_ <= realtime)) {
         ++count_;
     }
 
-    return FlushToResult::kSkip;
+    return FilterResult::kSkip;
 }
 
 // A second pass to send the selected elements
-FlushToResult LogReaderThread::FilterSecondPass(const LogBufferElement* element) {
+FilterResult LogReaderThread::FilterSecondPass(log_id_t log_id, pid_t pid, uint64_t,
+                                               log_time realtime, uint16_t dropped_count) {
     auto lock = std::lock_guard{reader_list_->reader_threads_lock()};
 
-    start_ = element->getSequence();
-
-    if (skip_ahead_[element->getLogId()]) {
-        skip_ahead_[element->getLogId()]--;
-        return FlushToResult::kSkip;
+    if (skip_ahead_[log_id]) {
+        skip_ahead_[log_id]--;
+        return FilterResult::kSkip;
     }
 
     if (leading_dropped_) {
-        if (element->getDropped()) {
-            return FlushToResult::kSkip;
+        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 FlushToResult::kStop;
+        return FilterResult::kStop;
     }
 
-    if (!IsWatching(element->getLogId())) {
-        return FlushToResult::kSkip;
+    if (pid_ && pid_ != pid) {
+        return FilterResult::kSkip;
     }
 
-    if (pid_ && pid_ != element->getPid()) {
-        return FlushToResult::kSkip;
-    }
-
-    if (start_time_ != log_time::EPOCH && element->getRealTime() <= start_time_) {
-        return FlushToResult::kSkip;
+    if (start_time_ != log_time::EPOCH && realtime <= start_time_) {
+        return FilterResult::kSkip;
     }
 
     if (release_) {
-        return FlushToResult::kStop;
+        return FilterResult::kStop;
     }
 
     if (!tail_) {
@@ -191,7 +186,7 @@
     ++index_;
 
     if (count_ > tail_ && index_ <= (count_ - tail_)) {
-        return FlushToResult::kSkip;
+        return FilterResult::kSkip;
     }
 
     if (!non_block_) {
@@ -199,10 +194,10 @@
     }
 
 ok:
-    if (!skip_ahead_[element->getLogId()]) {
-        return FlushToResult::kWrite;
+    if (!skip_ahead_[log_id]) {
+        return FilterResult::kWrite;
     }
-    return FlushToResult::kSkip;
+    return FilterResult::kSkip;
 }
 
 void LogReaderThread::cleanSkip_Locked(void) {
diff --git a/logd/LogReaderThread.h b/logd/LogReaderThread.h
index e48a3ca..f288d68 100644
--- a/logd/LogReaderThread.h
+++ b/logd/LogReaderThread.h
@@ -30,7 +30,6 @@
 #include <sysutils/SocketClient.h>
 
 #include "LogBuffer.h"
-#include "LogBufferElement.h"
 #include "LogWriter.h"
 
 class LogReaderList;
@@ -39,7 +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(); }
 
@@ -53,18 +52,22 @@
         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
-    FlushToResult FilterFirstPass(const LogBufferElement* element);
-    FlushToResult FilterSecondPass(const LogBufferElement* element);
+    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);
 
     std::condition_variable thread_triggered_condition_;
     LogBuffer* log_buffer_;
@@ -77,16 +80,14 @@
     // 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`.
@@ -102,8 +103,6 @@
     // 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..a2acab7 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -87,10 +87,10 @@
     ++mElementsTotal[log_id];
 }
 
-void LogStatistics::Add(LogBufferElement* element) {
+void LogStatistics::Add(const LogBufferElement& 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 +99,7 @@
     // 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 +107,7 @@
         ++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 +132,111 @@
         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.GetTag();
     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 LogBufferElement& 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.GetTag();
     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 LogBufferElement& 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.GetTag();
     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 +283,8 @@
          ++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) {
@@ -314,8 +314,8 @@
     *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_entries[0]->key();
         *second_worst_sizes = max_entries[1]->getSizes();
         if (*second_worst_sizes < threshold) {
             *second_worst_sizes = threshold;
@@ -344,7 +344,7 @@
         return;
     }
 
-    *worst = max_entries[0]->getKey();
+    *worst = max_entries[0]->key();
     *second_worst_sizes = worst_uid_sizes - max_entries[0]->getSizes() + max_entries[1]->getSizes();
 }
 
@@ -393,9 +393,8 @@
     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;
@@ -412,11 +411,10 @@
 }
 
 std::string UidEntry::format(const LogStatistics& stat, log_id_t id) const REQUIRES(stat.lock_) {
-    uid_t uid = getUid();
-    std::string name = android::base::StringPrintf("%u", uid);
+    std::string name = android::base::StringPrintf("%u", uid_);
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
-    stat.FormatTmp(nullptr, uid, name, size, 6);
+    stat.FormatTmp(nullptr, uid_, name, size, 6);
 
     std::string pruned = "";
     if (worstUidEnabledForLogid(id)) {
@@ -424,7 +422,7 @@
         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 +432,7 @@
         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 +459,7 @@
                 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;
             }
@@ -475,13 +472,13 @@
 
     std::string output = formatLine(name, size, pruned);
 
-    if (uid != AID_SYSTEM) {
+    if (uid_ != AID_SYSTEM) {
         return output;
     }
 
     static const size_t maximum_sorted_entries = 32;
     std::array<const PidEntry*, maximum_sorted_entries> sorted;
-    stat.pidSystemTable[id].MaxEntries(uid, 0, &sorted);
+    stat.pidSystemTable[id].MaxEntries(uid_, 0, &sorted);
 
     std::string byPid;
     size_t index;
@@ -494,7 +491,7 @@
         if (entry->getSizes() <= (getSizes() / 100)) {
             break;
         }
-        if (entry->getDropped()) {
+        if (entry->dropped_count()) {
             hasDropped = true;
         }
         byPid += entry->format(stat, id);
@@ -518,15 +515,13 @@
 
 std::string PidEntry::format(const LogStatistics& stat, log_id_t /* id */) 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);
     }
@@ -543,14 +538,13 @@
 
 std::string TidEntry::format(const LogStatistics& stat, log_id_t /* id */) 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);
     }
@@ -569,13 +563,12 @@
 std::string TagEntry::format(const LogStatistics& /* stat */,
                              log_id_t /* id */) 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 +577,7 @@
     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);
     }
@@ -602,34 +595,30 @@
 std::string TagNameEntry::format(const LogStatistics& /* stat */,
                                  log_id_t /* id */) 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 = this->name();
     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;
@@ -944,7 +933,7 @@
 
 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 +941,7 @@
     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..6a46adb 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -65,7 +65,7 @@
     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();
     }
@@ -90,10 +90,10 @@
         for (const_iterator it = map.begin(); it != map.end(); ++it) {
             const TEntry& entry = it->second;
 
-            if ((uid != AID_ROOT) && (uid != entry.getUid())) {
+            if (uid != AID_ROOT && uid != entry.uid()) {
                 continue;
             }
-            if (pid && entry.getPid() && (pid != entry.getPid())) {
+            if (pid && entry.pid() && pid != entry.pid()) {
                 continue;
             }
 
@@ -113,95 +113,67 @@
         }
     }
 
-    inline iterator add(const TKey& key, const LogBufferElement* element) {
+    iterator Add(const TKey& key, const LogBufferElement& 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 LogBufferElement& 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 LogBufferElement& 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 LogBufferElement& 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 LogBufferElement& element) { size_ += element.msg_len(); }
+    bool Subtract(const LogBufferElement& 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(),
@@ -213,258 +185,220 @@
         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 LogBufferElement& element)
+        : EntryBase(element), dropped_(element.dropped_count()) {}
 
-    EntryBaseDropped() : dropped(0) {
+    size_t dropped_count() const { return dropped_; }
+
+    void Add(const LogBufferElement& element) {
+        dropped_ += element.dropped_count();
+        EntryBase::Add(element);
     }
-    explicit EntryBaseDropped(const LogBufferElement* element)
-        : EntryBase(element), dropped(element->getDropped()) {
+    bool Subtract(const LogBufferElement& element) {
+        dropped_ -= element.dropped_count();
+        return EntryBase::Subtract(element) && !dropped_;
+    }
+    void Drop(const LogBufferElement& 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 LogBufferElement& element)
+        : EntryBaseDropped(element), uid_(element.uid()), pid_(element.pid()) {}
 
-    explicit UidEntry(const LogBufferElement* element)
-        : EntryBaseDropped(element),
-          uid(element->getUid()),
-          pid(element->getPid()) {
-    }
+    uid_t key() const { return uid_; }
+    uid_t uid() const { return key(); }
+    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 LogBufferElement& 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;
+
+  private:
+    const uid_t uid_;
+    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)
+          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)) {
-    }
+          pid_(element.pid()),
+          uid_(element.uid()),
+          name_(android::pidToName(pid_)) {}
     PidEntry(const PidEntry& element)
         : EntryBaseDropped(element),
-          pid(element.pid),
-          uid(element.uid),
-          name(element.name ? strdup(element.name) : nullptr) {
-    }
-    ~PidEntry() {
-        free(name);
-    }
+          pid_(element.pid_),
+          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;
-    }
+    pid_t key() const { return pid_; }
+    pid_t pid() const { return key(); }
+    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 LogBufferElement& 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;
+
+  private:
+    const pid_t pid_;
+    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)
+          tid_(tid),
+          pid_(pid),
+          uid_(android::pidToUid(tid)),
+          name_(android::tidToName(tid)) {}
+    explicit TidEntry(const LogBufferElement& element)
         : EntryBaseDropped(element),
-          tid(element->getTid()),
-          pid(element->getPid()),
-          uid(element->getUid()),
-          name(android::tidToName(tid)) {
-    }
+          tid_(element.tid()),
+          pid_(element.pid()),
+          uid_(element.uid()),
+          name_(android::tidToName(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);
-    }
+          tid_(element.tid_),
+          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 key() const { return tid_; }
+    pid_t tid() const { return key(); }
+    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 LogBufferElement& 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;
+
+  private:
+    const pid_t tid_;
+    pid_t pid_;
+    uid_t uid_;
+    char* name_;
 };
 
-struct TagEntry : public EntryBaseDropped {
-    const uint32_t tag;
-    pid_t pid;
-    uid_t uid;
-
-    explicit TagEntry(const LogBufferElement* element)
+class TagEntry : public EntryBaseDropped {
+  public:
+    explicit TagEntry(const LogBufferElement& element)
         : EntryBaseDropped(element),
-          tag(element->getTag()),
-          pid(element->getPid()),
-          uid(element->getUid()) {
-    }
+          tag_(element.GetTag()),
+          pid_(element.pid()),
+          uid_(element.uid()) {}
 
-    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);
-    }
+    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_); }
 
-    inline void add(const LogBufferElement* element) {
-        if (uid != element->getUid()) {
-            uid = -1;
+    void Add(const LogBufferElement& 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;
+
+  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*
 
-    explicit TagNameKey(const LogBufferElement* element)
-        : alloc(nullptr), name("", strlen("")) {
-        if (element->isBinary()) {
-            uint32_t tag = element->getTag();
+    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) {
@@ -478,13 +412,13 @@
             name = std::string_view(alloc->c_str(), alloc->size());
             return;
         }
-        const char* msg = element->getMsg();
+        const char* msg = element.msg();
         if (!msg) {
             name = std::string_view("chatty", strlen("chatty"));
             return;
         }
         ++msg;
-        uint16_t len = element->getMsgLen();
+        uint16_t len = element.msg_len();
         len = (len <= 1) ? 0 : strnlen(msg, len - 1);
         if (!len) {
             name = std::string_view("<NULL>", strlen("<NULL>"));
@@ -544,54 +478,43 @@
     }
 };
 
-struct TagNameEntry : public EntryBase {
-    pid_t tid;
-    pid_t pid;
-    uid_t uid;
-    TagNameKey name;
-
-    explicit TagNameEntry(const LogBufferElement* element)
+class TagNameEntry : public EntryBase {
+  public:
+    explicit TagNameEntry(const LogBufferElement& element)
         : EntryBase(element),
-          tid(element->getTid()),
-          pid(element->getPid()),
-          uid(element->getUid()),
-          name(element) {
-    }
+          tid_(element.tid()),
+          pid_(element.pid()),
+          uid_(element.uid()),
+          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();
-    }
+    const TagNameKey& key() const { return name_; }
+    pid_t tid() const { return tid_; }
+    pid_t pid() const { return pid_; }
+    uid_t uid() const { return uid_; }
+    const char* name() const { return name_.data(); }
+    size_t getNameAllocLength() const { return name_.getAllocLength(); }
 
-    inline void add(const LogBufferElement* element) {
-        if (uid != element->getUid()) {
-            uid = -1;
+    void Add(const LogBufferElement& element) {
+        if (uid_ != element.uid()) {
+            uid_ = -1;
         }
-        if (pid != element->getPid()) {
-            pid = -1;
+        if (pid_ != element.pid()) {
+            pid_ = -1;
         }
-        if (tid != element->getTid()) {
-            tid = -1;
+        if (tid_ != element.tid()) {
+            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;
+
+  private:
+    pid_t tid_;
+    pid_t pid_;
+    uid_t uid_;
+    TagNameKey name_;
 };
 
 // Log Statistics
@@ -645,11 +568,11 @@
                       (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();
@@ -667,14 +590,14 @@
     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 LogBufferElement& entry) EXCLUDES(lock_);
+    void Subtract(const LogBufferElement& entry) EXCLUDES(lock_);
     // entry->setDropped(1) must follow this call
-    void Drop(LogBufferElement* entry) EXCLUDES(lock_);
+    void Drop(const LogBufferElement& entry) EXCLUDES(lock_);
     // Correct for coalescing two entries referencing dropped content
-    void Erase(LogBufferElement* element) EXCLUDES(lock_) {
+    void Erase(const LogBufferElement& 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/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 1c83428..79ce069 100644
--- a/logd/SimpleLogBuffer.cpp
+++ b/logd/SimpleLogBuffer.cpp
@@ -44,7 +44,7 @@
     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()) {
@@ -102,21 +102,42 @@
 }
 
 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());
     MaybePrune(log_id);
     reader_list_->NotifyNewLog(1 << log_id);
 }
 
-uint64_t SimpleLogBuffer::FlushTo(
-        LogWriter* writer, uint64_t start, pid_t* last_tid,
-        const std::function<FlushToResult(const LogBufferElement* element)>& filter) {
+// 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_; }
+
+  private:
+    pid_t last_tid_[LOG_ID_MAX] = {};
+};
+
+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) {
     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 {
@@ -125,61 +146,57 @@
         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) {
-            FlushToResult ret = filter(&element);
-            if (ret == FlushToResult::kSkip) {
+            FilterResult ret = filter(element.log_id(), element.pid(), element.sequence(),
+                                      element.realtime(), element.dropped_count());
+            if (ret == FilterResult::kSkip) {
                 continue;
             }
-            if (ret == FlushToResult::kStop) {
+            if (ret == FilterResult::kStop) {
                 break;
             }
         }
 
-        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();
-        }
+        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.
@@ -271,22 +288,22 @@
     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);
         it = Erase(it);
         if (--prune_rows == 0) {
             return false;
diff --git a/logd/SimpleLogBuffer.h b/logd/SimpleLogBuffer.h
index 9a2d01a..a2ab881 100644
--- a/logd/SimpleLogBuffer.h
+++ b/logd/SimpleLogBuffer.h
@@ -35,9 +35,11 @@
 
     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<FlushToResult(const LogBufferElement* element)>& 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, uint16_t dropped_count)>&
+                         filter) override;
 
     bool Clear(log_id_t id, uid_t uid) override;
     unsigned long GetSize(log_id_t id) override;