diff --git a/cmds/dumpstate/DumpstateUtil.cpp b/cmds/dumpstate/DumpstateUtil.cpp
index aa42541..615701c 100644
--- a/cmds/dumpstate/DumpstateUtil.cpp
+++ b/cmds/dumpstate/DumpstateUtil.cpp
@@ -207,6 +207,7 @@
 int PropertiesHelper::dry_run_ = -1;
 int PropertiesHelper::unroot_ = -1;
 int PropertiesHelper::parallel_run_ = -1;
+int PropertiesHelper::strict_run_ = -1;
 
 bool PropertiesHelper::IsUserBuild() {
     if (build_type_.empty()) {
@@ -237,6 +238,14 @@
     return parallel_run_ == 1;
 }
 
+bool PropertiesHelper::IsStrictRun() {
+    if (strict_run_ == -1) {
+        // Defaults to using stricter timeouts.
+        strict_run_ = android::base::GetBoolProperty("dumpstate.strict_run", true) ? 1 : 0;
+    }
+    return strict_run_ == 1;
+}
+
 int DumpFileToFd(int out_fd, const std::string& title, const std::string& path) {
     android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(path.c_str(), O_RDONLY | O_NONBLOCK | O_CLOEXEC)));
     if (fd.get() < 0) {
diff --git a/cmds/dumpstate/DumpstateUtil.h b/cmds/dumpstate/DumpstateUtil.h
index b00c46e..9e955e3 100644
--- a/cmds/dumpstate/DumpstateUtil.h
+++ b/cmds/dumpstate/DumpstateUtil.h
@@ -193,11 +193,19 @@
      */
     static bool IsParallelRun();
 
+    /*
+     * Strict-run mode is determined by the `dumpstate.strict_run` sysprop which
+     * will default to true. This results in shortened timeouts for flaky
+     * sections.
+     */
+    static bool IsStrictRun();
+
   private:
     static std::string build_type_;
     static int dry_run_;
     static int unroot_;
     static int parallel_run_;
+    static int strict_run_;
 };
 
 /*
diff --git a/cmds/dumpstate/dumpstate.cpp b/cmds/dumpstate/dumpstate.cpp
index ed7b1b9..e132b35 100644
--- a/cmds/dumpstate/dumpstate.cpp
+++ b/cmds/dumpstate/dumpstate.cpp
@@ -822,9 +822,12 @@
     RunCommandToFd(STDOUT_FILENO, "", {"uptime", "-p"},
                    CommandOptions::WithTimeout(1).Always().Build());
     printf("Bugreport format version: %s\n", version_.c_str());
-    printf("Dumpstate info: id=%d pid=%d dry_run=%d parallel_run=%d args=%s bugreport_mode=%s\n",
-           id_, pid_, PropertiesHelper::IsDryRun(), PropertiesHelper::IsParallelRun(),
-           options_->args.c_str(), options_->bugreport_mode_string.c_str());
+    printf(
+        "Dumpstate info: id=%d pid=%d dry_run=%d parallel_run=%d strict_run=%d args=%s "
+        "bugreport_mode=%s\n",
+        id_, pid_, PropertiesHelper::IsDryRun(), PropertiesHelper::IsParallelRun(),
+        PropertiesHelper::IsStrictRun(), options_->args.c_str(),
+        options_->bugreport_mode_string.c_str());
     printf("\n");
 }
 
@@ -1046,7 +1049,8 @@
         MYLOGE("Could not open %s to dump incident report.\n", path.c_str());
         return;
     }
-    RunCommandToFd(fd, "", {"incident", "-u"}, CommandOptions::WithTimeout(20).Build());
+    RunCommandToFd(fd, "", {"incident", "-u"},
+                   CommandOptions::WithTimeout(PropertiesHelper::IsStrictRun() ? 20 : 120).Build());
     bool empty = 0 == lseek(fd, 0, SEEK_END);
     if (!empty) {
         // Use a different name from "incident.proto"
@@ -3141,6 +3145,12 @@
         MYLOGI("Running on dry-run mode (to disable it, call 'setprop dumpstate.dry_run false')\n");
     }
 
+    if (PropertiesHelper::IsStrictRun()) {
+        MYLOGI(
+            "Running on strict-run mode, which has shorter timeouts "
+            "(to disable, call 'setprop dumpstate.strict_run false')\n");
+    }
+
     MYLOGI("dumpstate info: id=%d, args='%s', bugreport_mode= %s bugreport format version: %s\n",
            id_, options_->args.c_str(), options_->bugreport_mode_string.c_str(), version_.c_str());
 
diff --git a/include/android/performance_hint.h b/include/android/performance_hint.h
index b494f89..cedd361 100644
--- a/include/android/performance_hint.h
+++ b/include/android/performance_hint.h
@@ -171,6 +171,7 @@
  * @return 0 on success.
  *         EINVAL if the list of thread ids is empty or if  any of the thread ids is not part of the thread group.
  *         EPIPE if communication with the system service has failed.
+ *         EPERM if any thread id doesn't belong to the application.
  */
 int APerformanceHint_setThreads(
         APerformanceHintSession* session,
diff --git a/libs/binder/ndk/tests/libbinder_ndk_unit_test.cpp b/libs/binder/ndk/tests/libbinder_ndk_unit_test.cpp
index 27ce615..089e55f 100644
--- a/libs/binder/ndk/tests/libbinder_ndk_unit_test.cpp
+++ b/libs/binder/ndk/tests/libbinder_ndk_unit_test.cpp
@@ -377,18 +377,24 @@
 }
 
 TEST(NdkBinder, GetTestServiceStressTest) {
-    // libbinder has some complicated logic to make sure only one instance of
-    // ABpBinder is associated with each binder.
-
     constexpr size_t kNumThreads = 10;
     constexpr size_t kNumCalls = 1000;
     std::vector<std::thread> threads;
 
+    // this is not a lazy service, but we must make sure that it's started before calling
+    // checkService on it, since the other process serving it might not be started yet.
+    {
+        // getService, not waitForService, to take advantage of timeout
+        auto binder = ndk::SpAIBinder(AServiceManager_getService(IFoo::kSomeInstanceName));
+        ASSERT_NE(nullptr, binder.get());
+    }
+
     for (size_t i = 0; i < kNumThreads; i++) {
         threads.push_back(std::thread([&]() {
             for (size_t j = 0; j < kNumCalls; j++) {
                 auto binder =
                         ndk::SpAIBinder(AServiceManager_checkService(IFoo::kSomeInstanceName));
+                ASSERT_NE(nullptr, binder.get());
                 EXPECT_EQ(STATUS_OK, AIBinder_ping(binder.get()));
             }
         }));
diff --git a/libs/binder/tests/binderRpcTest.cpp b/libs/binder/tests/binderRpcTest.cpp
index 38c7f7c..4c3c68e 100644
--- a/libs/binder/tests/binderRpcTest.cpp
+++ b/libs/binder/tests/binderRpcTest.cpp
@@ -249,12 +249,12 @@
         CHECK_EQ(options.numIncomingConnectionsBySession.size(), options.numSessions);
     }
 
-    SocketType socketType = std::get<0>(GetParam());
-    RpcSecurity rpcSecurity = std::get<1>(GetParam());
-    uint32_t clientVersion = std::get<2>(GetParam());
-    uint32_t serverVersion = std::get<3>(GetParam());
-    bool singleThreaded = std::get<4>(GetParam());
-    bool noKernel = std::get<5>(GetParam());
+    SocketType socketType = GetParam().type;
+    RpcSecurity rpcSecurity = GetParam().security;
+    uint32_t clientVersion = GetParam().clientVersion;
+    uint32_t serverVersion = GetParam().serverVersion;
+    bool singleThreaded = GetParam().singleThreaded;
+    bool noKernel = GetParam().noKernel;
 
     std::string path = android::base::GetExecutableDirectory();
     auto servicePath = android::base::StringPrintf("%s/binder_rpc_test_service%s%s", path.c_str(),
@@ -1121,12 +1121,27 @@
 }
 
 #ifdef BINDER_RPC_TO_TRUSTY_TEST
-INSTANTIATE_TEST_CASE_P(Trusty, BinderRpc,
-                        ::testing::Combine(::testing::Values(SocketType::TIPC),
-                                           ::testing::Values(RpcSecurity::RAW),
-                                           ::testing::ValuesIn(testVersions()),
-                                           ::testing::ValuesIn(testVersions()),
-                                           ::testing::Values(true), ::testing::Values(true)),
+
+static std::vector<BinderRpc::ParamType> getTrustyBinderRpcParams() {
+    std::vector<BinderRpc::ParamType> ret;
+
+    for (const auto& clientVersion : testVersions()) {
+        for (const auto& serverVersion : testVersions()) {
+            ret.push_back(BinderRpc::ParamType{
+                    .type = SocketType::TIPC,
+                    .security = RpcSecurity::RAW,
+                    .clientVersion = clientVersion,
+                    .serverVersion = serverVersion,
+                    .singleThreaded = true,
+                    .noKernel = true,
+            });
+        }
+    }
+
+    return ret;
+}
+
+INSTANTIATE_TEST_CASE_P(Trusty, BinderRpc, ::testing::ValuesIn(getTrustyBinderRpcParams()),
                         BinderRpc::PrintParamInfo);
 #else // BINDER_RPC_TO_TRUSTY_TEST
 bool testSupportVsockLoopback() {
@@ -1246,13 +1261,47 @@
     return ret;
 }
 
-INSTANTIATE_TEST_CASE_P(PerSocket, BinderRpc,
-                        ::testing::Combine(::testing::ValuesIn(testSocketTypes()),
-                                           ::testing::ValuesIn(RpcSecurityValues()),
-                                           ::testing::ValuesIn(testVersions()),
-                                           ::testing::ValuesIn(testVersions()),
-                                           ::testing::Values(false, true),
-                                           ::testing::Values(false, true)),
+static std::vector<BinderRpc::ParamType> getBinderRpcParams() {
+    std::vector<BinderRpc::ParamType> ret;
+
+    constexpr bool full = false;
+
+    for (const auto& type : testSocketTypes()) {
+        if (full || type == SocketType::UNIX) {
+            for (const auto& security : RpcSecurityValues()) {
+                for (const auto& clientVersion : testVersions()) {
+                    for (const auto& serverVersion : testVersions()) {
+                        for (bool singleThreaded : {false, true}) {
+                            for (bool noKernel : {false, true}) {
+                                ret.push_back(BinderRpc::ParamType{
+                                        .type = type,
+                                        .security = security,
+                                        .clientVersion = clientVersion,
+                                        .serverVersion = serverVersion,
+                                        .singleThreaded = singleThreaded,
+                                        .noKernel = noKernel,
+                                });
+                            }
+                        }
+                    }
+                }
+            }
+        } else {
+            ret.push_back(BinderRpc::ParamType{
+                    .type = type,
+                    .security = RpcSecurity::RAW,
+                    .clientVersion = RPC_WIRE_PROTOCOL_VERSION,
+                    .serverVersion = RPC_WIRE_PROTOCOL_VERSION,
+                    .singleThreaded = false,
+                    .noKernel = false,
+            });
+        }
+    }
+
+    return ret;
+}
+
+INSTANTIATE_TEST_CASE_P(PerSocket, BinderRpc, ::testing::ValuesIn(getBinderRpcParams()),
                         BinderRpc::PrintParamInfo);
 
 class BinderRpcServerRootObject
diff --git a/libs/binder/tests/binderRpcTestFixture.h b/libs/binder/tests/binderRpcTestFixture.h
index 0b8920b..2c9646b 100644
--- a/libs/binder/tests/binderRpcTestFixture.h
+++ b/libs/binder/tests/binderRpcTestFixture.h
@@ -106,15 +106,23 @@
     }
 };
 
-class BinderRpc : public ::testing::TestWithParam<
-                          std::tuple<SocketType, RpcSecurity, uint32_t, uint32_t, bool, bool>> {
+struct BinderRpcParam {
+    SocketType type;
+    RpcSecurity security;
+    uint32_t clientVersion;
+    uint32_t serverVersion;
+    bool singleThreaded;
+    bool noKernel;
+};
+class BinderRpc : public ::testing::TestWithParam<BinderRpcParam> {
 public:
-    SocketType socketType() const { return std::get<0>(GetParam()); }
-    RpcSecurity rpcSecurity() const { return std::get<1>(GetParam()); }
-    uint32_t clientVersion() const { return std::get<2>(GetParam()); }
-    uint32_t serverVersion() const { return std::get<3>(GetParam()); }
-    bool serverSingleThreaded() const { return std::get<4>(GetParam()); }
-    bool noKernel() const { return std::get<5>(GetParam()); }
+    // TODO: avoid unnecessary layer of indirection
+    SocketType socketType() const { return GetParam().type; }
+    RpcSecurity rpcSecurity() const { return GetParam().security; }
+    uint32_t clientVersion() const { return GetParam().clientVersion; }
+    uint32_t serverVersion() const { return GetParam().serverVersion; }
+    bool serverSingleThreaded() const { return GetParam().singleThreaded; }
+    bool noKernel() const { return GetParam().noKernel; }
 
     bool clientOrServerSingleThreaded() const {
         return !kEnableRpcThreads || serverSingleThreaded();
@@ -148,15 +156,16 @@
     }
 
     static std::string PrintParamInfo(const testing::TestParamInfo<ParamType>& info) {
-        auto [type, security, clientVersion, serverVersion, singleThreaded, noKernel] = info.param;
-        auto ret = PrintToString(type) + "_" + newFactory(security)->toCString() + "_clientV" +
-                std::to_string(clientVersion) + "_serverV" + std::to_string(serverVersion);
-        if (singleThreaded) {
+        auto ret = PrintToString(info.param.type) + "_" +
+                newFactory(info.param.security)->toCString() + "_clientV" +
+                std::to_string(info.param.clientVersion) + "_serverV" +
+                std::to_string(info.param.serverVersion);
+        if (info.param.singleThreaded) {
             ret += "_single_threaded";
         } else {
             ret += "_multi_threaded";
         }
-        if (noKernel) {
+        if (info.param.noKernel) {
             ret += "_no_kernel";
         } else {
             ret += "_with_kernel";
diff --git a/libs/binder/tests/binderRpcTestTrusty.cpp b/libs/binder/tests/binderRpcTestTrusty.cpp
index 28be10d..fcb83bd 100644
--- a/libs/binder/tests/binderRpcTestTrusty.cpp
+++ b/libs/binder/tests/binderRpcTestTrusty.cpp
@@ -57,9 +57,9 @@
                                     [](size_t n) { return n != 0; }),
                         "Non-zero incoming connections on Trusty");
 
-    RpcSecurity rpcSecurity = std::get<1>(GetParam());
-    uint32_t clientVersion = std::get<2>(GetParam());
-    uint32_t serverVersion = std::get<3>(GetParam());
+    RpcSecurity rpcSecurity = GetParam().security;
+    uint32_t clientVersion = GetParam().clientVersion;
+    uint32_t serverVersion = GetParam().serverVersion;
 
     auto ret = std::make_unique<TrustyProcessSession>();
 
@@ -89,12 +89,27 @@
     return ret;
 }
 
-INSTANTIATE_TEST_CASE_P(Trusty, BinderRpc,
-                        ::testing::Combine(::testing::Values(SocketType::TIPC),
-                                           ::testing::Values(RpcSecurity::RAW),
-                                           ::testing::ValuesIn(testVersions()),
-                                           ::testing::ValuesIn(testVersions()),
-                                           ::testing::Values(false), ::testing::Values(true)),
+static std::vector<BinderRpc::ParamType> getTrustyBinderRpcParams() {
+    std::vector<BinderRpc::ParamType> ret;
+
+    for (const auto& clientVersion : testVersions()) {
+        for (const auto& serverVersion : testVersions()) {
+            ret.push_back(BinderRpc::ParamType{
+                    .type = SocketType::TIPC,
+                    .security = RpcSecurity::RAW,
+                    .clientVersion = clientVersion,
+                    .serverVersion = serverVersion,
+                    // TODO: should we test both versions here?
+                    .singleThreaded = false,
+                    .noKernel = true,
+            });
+        }
+    }
+
+    return ret;
+}
+
+INSTANTIATE_TEST_CASE_P(Trusty, BinderRpc, ::testing::ValuesIn(getTrustyBinderRpcParams()),
                         BinderRpc::PrintParamInfo);
 
 } // namespace android
diff --git a/libs/binder/tests/binderRpcUniversalTests.cpp b/libs/binder/tests/binderRpcUniversalTests.cpp
index 1f46010..e43508e 100644
--- a/libs/binder/tests/binderRpcUniversalTests.cpp
+++ b/libs/binder/tests/binderRpcUniversalTests.cpp
@@ -84,7 +84,7 @@
         GTEST_SKIP() << "This test requires a multi-threaded service";
     }
 
-    SocketType type = std::get<0>(GetParam());
+    SocketType type = GetParam().type;
     if (type == SocketType::PRECONNECTED || type == SocketType::UNIX ||
         type == SocketType::UNIX_BOOTSTRAP || type == SocketType::UNIX_RAW) {
         // we can't get port numbers for unix sockets
diff --git a/libs/binder/tests/rpc_fuzzer/main.cpp b/libs/binder/tests/rpc_fuzzer/main.cpp
index b8ae84d..dcc8b8e 100644
--- a/libs/binder/tests/rpc_fuzzer/main.cpp
+++ b/libs/binder/tests/rpc_fuzzer/main.cpp
@@ -135,7 +135,7 @@
 
     // b/260736889 - limit arbitrarily, due to thread resource exhaustion, which currently
     // aborts. Servers should consider RpcServer::setConnectionFilter instead.
-    constexpr size_t kMaxConnections = 1000;
+    constexpr size_t kMaxConnections = 10;
 
     while (provider.remaining_bytes() > 0) {
         if (connections.empty() ||
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 9de623f..9f24dd6 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -68,6 +68,7 @@
 #include <gui/LayerMetadata.h>
 #include <gui/LayerState.h>
 #include <gui/Surface.h>
+#include <gui/SurfaceComposerClient.h>
 #include <gui/TraceUtils.h>
 #include <hidl/ServiceManagement.h>
 #include <layerproto/LayerProtoParser.h>
@@ -91,13 +92,12 @@
 #include <ui/LayerStack.h>
 #include <ui/PixelFormat.h>
 #include <ui/StaticDisplayInfo.h>
+#include <unistd.h>
 #include <utils/StopWatch.h>
 #include <utils/String16.h>
 #include <utils/String8.h>
 #include <utils/Timers.h>
 #include <utils/misc.h>
-
-#include <unistd.h>
 #include <algorithm>
 #include <cerrno>
 #include <cinttypes>
@@ -6522,9 +6522,9 @@
         code == IBinder::SYSPROPS_TRANSACTION) {
         return OK;
     }
-    // Numbers from 1000 to 1043 are currently used for backdoors. The code
+    // Numbers from 1000 to 1044 are currently used for backdoors. The code
     // in onTransact verifies that the user is root, and has access to use SF.
-    if (code >= 1000 && code <= 1043) {
+    if (code >= 1000 && code <= 1044) {
         ALOGV("Accessing SurfaceFlinger through backdoor code: %u", code);
         return OK;
     }
@@ -7003,6 +7003,73 @@
                 future.wait();
                 return NO_ERROR;
             }
+
+            case 1044: { // Enable/Disable mirroring from one display to another
+                /*
+                 * Mirror one display onto another.
+                 * Ensure the source and destination displays are on.
+                 * Commands:
+                 * 0: Mirror one display to another
+                 * 1: Disable mirroring to a previously mirrored display
+                 * 2: Disable mirroring on previously mirrored displays
+                 *
+                 * Ex:
+                 * Get the display ids:
+                 * adb shell dumpsys SurfaceFlinger --display-id
+                 * Mirror first display to the second:
+                 * adb shell service call SurfaceFlinger 1044 i64 0 i64 4619827677550801152 i64
+                 * 4619827677550801153
+                 * Stop mirroring:
+                 * adb shell service call SurfaceFlinger 1044 i64 1
+                 */
+
+                int64_t arg0 = data.readInt64();
+
+                switch (arg0) {
+                    case 0: {
+                        // Mirror arg1 to arg2
+                        int64_t arg1 = data.readInt64();
+                        int64_t arg2 = data.readInt64();
+                        // Enable mirroring for one display
+                        const auto display1id = DisplayId::fromValue(arg1);
+                        auto mirrorRoot = SurfaceComposerClient::getDefault()->mirrorDisplay(
+                                display1id.value());
+                        auto id2 = DisplayId::fromValue<PhysicalDisplayId>(arg2);
+                        const auto token2 = getPhysicalDisplayToken(*id2);
+                        ui::LayerStack layerStack;
+                        {
+                            Mutex::Autolock lock(mStateLock);
+                            sp<DisplayDevice> display = getDisplayDeviceLocked(token2);
+                            layerStack = display->getLayerStack();
+                        }
+                        SurfaceComposerClient::Transaction t;
+                        t.setDisplayLayerStack(token2, layerStack);
+                        t.setLayer(mirrorRoot, INT_MAX); // Top-most layer
+                        t.setLayerStack(mirrorRoot, layerStack);
+                        t.apply();
+
+                        mMirrorMapForDebug.emplace_or_replace(arg2, mirrorRoot);
+                        break;
+                    }
+
+                    case 1: {
+                        // Disable mirroring for arg1
+                        int64_t arg1 = data.readInt64();
+                        mMirrorMapForDebug.erase(arg1);
+                        break;
+                    }
+
+                    case 2: {
+                        // Disable mirroring for all displays
+                        mMirrorMapForDebug.clear();
+                        break;
+                    }
+
+                    default:
+                        return BAD_VALUE;
+                }
+                return NO_ERROR;
+            }
         }
     }
     return err;
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 4374f94..b07910d 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -1443,6 +1443,10 @@
 
     // WindowInfo ids visible during the last commit.
     std::unordered_set<int32_t> mVisibleWindowIds;
+
+    // Mirroring
+    // Map of displayid to mirrorRoot
+    ftl::SmallMap<int64_t, sp<SurfaceControl>, 3> mMirrorMapForDebug;
 };
 
 class SurfaceComposerAIDL : public gui::BnSurfaceComposer {