services/inputflinger/dispatcher/LatencyAggregator.cpp - third_party/android/platform/frameworks/native - Git at Google

 /*
  * Copyright (C) 2021 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.
  */

 #define LOG_TAG "LatencyAggregator"
 #include "LatencyAggregator.h"

 #include <inttypes.h>

 #include <android-base/stringprintf.h>
 #include <input/Input.h>
 #include <log/log.h>
 #include <server_configurable_flags/get_flags.h>

 using android::base::StringPrintf;
 using dist_proc::aggregation::KllQuantile;
 using std::chrono_literals::operator""ms;

 // Convert the provided nanoseconds into hundreds of microseconds.
 // Use hundreds of microseconds (as opposed to microseconds) to preserve space.
 static inline int64_t ns2hus(nsecs_t nanos) {
     return ns2us(nanos) / 100;
 }

 // The maximum number of events that we will store in the statistics. Any events that we will
 // receive after we have reached this number will be ignored. We could also implement this by
 // checking the actual size of the current data and making sure that we do not go over. However,
 // the serialization process of sketches is too heavy (1 ms for all 14 sketches), and would be too
 // much to do (even if infrequently).
 // The value here has been determined empirically.
 static constexpr size_t MAX_EVENTS_FOR_STATISTICS = 20000;

 // Category (=namespace) name for the input settings that are applied at boot time
 static const char* INPUT_NATIVE_BOOT = "input_native_boot";
 // Feature flag name for the threshold of end-to-end touch latency that would trigger
 // SlowEventReported atom to be pushed
 static const char* SLOW_EVENT_MIN_REPORTING_LATENCY_MILLIS =
         "slow_event_min_reporting_latency_millis";
 // Feature flag name for the minimum delay before reporting a slow event after having just reported
 // a slow event. This helps limit the amount of data sent to the server
 static const char* SLOW_EVENT_MIN_REPORTING_INTERVAL_MILLIS =
         "slow_event_min_reporting_interval_millis";

 // If an event has end-to-end latency > 200 ms, it will get reported as a slow event.
 std::chrono::milliseconds DEFAULT_SLOW_EVENT_MIN_REPORTING_LATENCY = 200ms;
 // If we receive two slow events less than 1 min apart, we will only report 1 of them.
 std::chrono::milliseconds DEFAULT_SLOW_EVENT_MIN_REPORTING_INTERVAL = 60000ms;

 static std::chrono::milliseconds getSlowEventMinReportingLatency() {
     std::string millis = server_configurable_flags::
             GetServerConfigurableFlag(INPUT_NATIVE_BOOT, SLOW_EVENT_MIN_REPORTING_LATENCY_MILLIS,
                                       std::to_string(
                                               DEFAULT_SLOW_EVENT_MIN_REPORTING_LATENCY.count()));
     return std::chrono::milliseconds(std::stoi(millis));
 }

 static std::chrono::milliseconds getSlowEventMinReportingInterval() {
     std::string millis = server_configurable_flags::
             GetServerConfigurableFlag(INPUT_NATIVE_BOOT, SLOW_EVENT_MIN_REPORTING_INTERVAL_MILLIS,
                                       std::to_string(
                                               DEFAULT_SLOW_EVENT_MIN_REPORTING_INTERVAL.count()));
     return std::chrono::milliseconds(std::stoi(millis));
 }

 namespace android::inputdispatcher {

 /**
  * Same as android::util::BytesField, but doesn't store raw pointers, and therefore deletes its
  * resources automatically.
  */
 class SafeBytesField {
 public:
     explicit SafeBytesField(dist_proc::aggregation::KllQuantile& quantile) {
         const zetasketch::android::AggregatorStateProto aggProto = quantile.SerializeToProto();
         mBuffer.resize(aggProto.ByteSizeLong());
         aggProto.SerializeToArray(mBuffer.data(), mBuffer.size());
     }
     android::util::BytesField getBytesField() {
         return android::util::BytesField(mBuffer.data(), mBuffer.size());
     }

 private:
     std::vector<char> mBuffer;
 };

 LatencyAggregator::LatencyAggregator() {
     AStatsManager_setPullAtomCallback(android::util::INPUT_EVENT_LATENCY_SKETCH, nullptr,
                                       LatencyAggregator::pullAtomCallback, this);
     dist_proc::aggregation::KllQuantileOptions options;
     options.set_inv_eps(100); // Request precision of 1.0%, instead of default 0.1%
     for (size_t i = 0; i < SketchIndex::SIZE; i++) {
         mDownSketches[i] = KllQuantile::Create(options);
         mMoveSketches[i] = KllQuantile::Create(options);
     }
 }

 LatencyAggregator::~LatencyAggregator() {
     AStatsManager_clearPullAtomCallback(android::util::INPUT_EVENT_LATENCY_SKETCH);
 }

 AStatsManager_PullAtomCallbackReturn LatencyAggregator::pullAtomCallback(int32_t atomTag,
                                                                          AStatsEventList* data,
                                                                          void* cookie) {
     LatencyAggregator* pAggregator = reinterpret_cast<LatencyAggregator*>(cookie);
     if (pAggregator == nullptr) {
         LOG_ALWAYS_FATAL("pAggregator is null!");
     }
     return pAggregator->pullData(data);
 }

 void LatencyAggregator::processTimeline(const InputEventTimeline& timeline) {
     processStatistics(timeline);
     processSlowEvent(timeline);
 }

 void LatencyAggregator::processStatistics(const InputEventTimeline& timeline) {
     // Before we do any processing, check that we have not yet exceeded MAX_SIZE
     if (mNumSketchEventsProcessed >= MAX_EVENTS_FOR_STATISTICS) {
         return;
     }
     mNumSketchEventsProcessed++;

     std::array<std::unique_ptr<KllQuantile>, SketchIndex::SIZE>& sketches =
             timeline.isDown ? mDownSketches : mMoveSketches;

     // Process common ones first
     const nsecs_t eventToRead = timeline.readTime - timeline.eventTime;
     sketches[SketchIndex::EVENT_TO_READ]->Add(ns2hus(eventToRead));

     // Now process per-connection ones
     for (const auto& [connectionToken, connectionTimeline] : timeline.connectionTimelines) {
         if (!connectionTimeline.isComplete()) {
             continue;
         }
         const nsecs_t readToDeliver = connectionTimeline.deliveryTime - timeline.readTime;
         const nsecs_t deliverToConsume =
                 connectionTimeline.consumeTime - connectionTimeline.deliveryTime;
         const nsecs_t consumeToFinish =
                 connectionTimeline.finishTime - connectionTimeline.consumeTime;
         const nsecs_t gpuCompletedTime =
                 connectionTimeline.graphicsTimeline[GraphicsTimeline::GPU_COMPLETED_TIME];
         const nsecs_t presentTime =
                 connectionTimeline.graphicsTimeline[GraphicsTimeline::PRESENT_TIME];
         const nsecs_t consumeToGpuComplete = gpuCompletedTime - connectionTimeline.consumeTime;
         const nsecs_t gpuCompleteToPresent = presentTime - gpuCompletedTime;
         const nsecs_t endToEnd = presentTime - timeline.eventTime;

         sketches[SketchIndex::READ_TO_DELIVER]->Add(ns2hus(readToDeliver));
         sketches[SketchIndex::DELIVER_TO_CONSUME]->Add(ns2hus(deliverToConsume));
         sketches[SketchIndex::CONSUME_TO_FINISH]->Add(ns2hus(consumeToFinish));
         sketches[SketchIndex::CONSUME_TO_GPU_COMPLETE]->Add(ns2hus(consumeToGpuComplete));
         sketches[SketchIndex::GPU_COMPLETE_TO_PRESENT]->Add(ns2hus(gpuCompleteToPresent));
         sketches[SketchIndex::END_TO_END]->Add(ns2hus(endToEnd));
     }
 }

 AStatsManager_PullAtomCallbackReturn LatencyAggregator::pullData(AStatsEventList* data) {
     std::array<std::unique_ptr<SafeBytesField>, SketchIndex::SIZE> serializedDownData;
     std::array<std::unique_ptr<SafeBytesField>, SketchIndex::SIZE> serializedMoveData;
     for (size_t i = 0; i < SketchIndex::SIZE; i++) {
         serializedDownData[i] = std::make_unique<SafeBytesField>(*mDownSketches[i]);
         serializedMoveData[i] = std::make_unique<SafeBytesField>(*mMoveSketches[i]);
     }
     android::util::
             addAStatsEvent(data, android::util::INPUT_EVENT_LATENCY_SKETCH,
                            // DOWN sketches
                            serializedDownData[SketchIndex::EVENT_TO_READ]->getBytesField(),
                            serializedDownData[SketchIndex::READ_TO_DELIVER]->getBytesField(),
                            serializedDownData[SketchIndex::DELIVER_TO_CONSUME]->getBytesField(),
                            serializedDownData[SketchIndex::CONSUME_TO_FINISH]->getBytesField(),
                            serializedDownData[SketchIndex::CONSUME_TO_GPU_COMPLETE]
                                    ->getBytesField(),
                            serializedDownData[SketchIndex::GPU_COMPLETE_TO_PRESENT]
                                    ->getBytesField(),
                            serializedDownData[SketchIndex::END_TO_END]->getBytesField(),
                            // MOVE sketches
                            serializedMoveData[SketchIndex::EVENT_TO_READ]->getBytesField(),
                            serializedMoveData[SketchIndex::READ_TO_DELIVER]->getBytesField(),
                            serializedMoveData[SketchIndex::DELIVER_TO_CONSUME]->getBytesField(),
                            serializedMoveData[SketchIndex::CONSUME_TO_FINISH]->getBytesField(),
                            serializedMoveData[SketchIndex::CONSUME_TO_GPU_COMPLETE]
                                    ->getBytesField(),
                            serializedMoveData[SketchIndex::GPU_COMPLETE_TO_PRESENT]
                                    ->getBytesField(),
                            serializedMoveData[SketchIndex::END_TO_END]->getBytesField());

     for (size_t i = 0; i < SketchIndex::SIZE; i++) {
         mDownSketches[i]->Reset();
         mMoveSketches[i]->Reset();
     }
     // Start new aggregations
     mNumSketchEventsProcessed = 0;
     return AStatsManager_PULL_SUCCESS;
 }

 void LatencyAggregator::processSlowEvent(const InputEventTimeline& timeline) {
     static const std::chrono::duration sSlowEventThreshold = getSlowEventMinReportingLatency();
     static const std::chrono::duration sSlowEventReportingInterval =
             getSlowEventMinReportingInterval();
     for (const auto& [token, connectionTimeline] : timeline.connectionTimelines) {
         if (!connectionTimeline.isComplete()) {
             continue;
         }
         mNumEventsSinceLastSlowEventReport++;
         const nsecs_t presentTime =
                 connectionTimeline.graphicsTimeline[GraphicsTimeline::PRESENT_TIME];
         const std::chrono::nanoseconds endToEndLatency =
                 std::chrono::nanoseconds(presentTime - timeline.eventTime);
         if (endToEndLatency < sSlowEventThreshold) {
             continue;
         }
         // This is a slow event. Before we report it, check if we are reporting too often
         const std::chrono::duration elapsedSinceLastReport =
                 std::chrono::nanoseconds(timeline.eventTime - mLastSlowEventTime);
         if (elapsedSinceLastReport < sSlowEventReportingInterval) {
             mNumSkippedSlowEvents++;
             continue;
         }

         const nsecs_t eventToRead = timeline.readTime - timeline.eventTime;
         const nsecs_t readToDeliver = connectionTimeline.deliveryTime - timeline.readTime;
         const nsecs_t deliverToConsume =
                 connectionTimeline.consumeTime - connectionTimeline.deliveryTime;
         const nsecs_t consumeToFinish =
                 connectionTimeline.finishTime - connectionTimeline.consumeTime;
         const nsecs_t gpuCompletedTime =
                 connectionTimeline.graphicsTimeline[GraphicsTimeline::GPU_COMPLETED_TIME];
         const nsecs_t consumeToGpuComplete = gpuCompletedTime - connectionTimeline.consumeTime;
         const nsecs_t gpuCompleteToPresent = presentTime - gpuCompletedTime;

         android::util::stats_write(android::util::SLOW_INPUT_EVENT_REPORTED, timeline.isDown,
                                    static_cast<int32_t>(ns2us(eventToRead)),
                                    static_cast<int32_t>(ns2us(readToDeliver)),
                                    static_cast<int32_t>(ns2us(deliverToConsume)),
                                    static_cast<int32_t>(ns2us(consumeToFinish)),
                                    static_cast<int32_t>(ns2us(consumeToGpuComplete)),
                                    static_cast<int32_t>(ns2us(gpuCompleteToPresent)),
                                    static_cast<int32_t>(ns2us(endToEndLatency.count())),
                                    static_cast<int32_t>(mNumEventsSinceLastSlowEventReport),
                                    static_cast<int32_t>(mNumSkippedSlowEvents));
         mNumEventsSinceLastSlowEventReport = 0;
         mNumSkippedSlowEvents = 0;
         mLastSlowEventTime = timeline.readTime;
     }
 }

 std::string LatencyAggregator::dump(const char* prefix) {
     std::string sketchDump = StringPrintf("%s  Sketches:\n", prefix);
     for (size_t i = 0; i < SketchIndex::SIZE; i++) {
         const int64_t numDown = mDownSketches[i]->num_values();
         SafeBytesField downBytesField(*mDownSketches[i]);
         const float downBytesKb = downBytesField.getBytesField().arg_length * 1E-3;
         const int64_t numMove = mMoveSketches[i]->num_values();
         SafeBytesField moveBytesField(*mMoveSketches[i]);
         const float moveBytesKb = moveBytesField.getBytesField().arg_length * 1E-3;
         sketchDump +=
                 StringPrintf("%s    mDownSketches[%zu]->num_values = %" PRId64 " size = %.1fKB"
                              " mMoveSketches[%zu]->num_values = %" PRId64 " size = %.1fKB\n",
                              prefix, i, numDown, downBytesKb, i, numMove, moveBytesKb);
     }

     return StringPrintf("%sLatencyAggregator:\n", prefix) + sketchDump +
             StringPrintf("%s  mNumSketchEventsProcessed=%zu\n", prefix, mNumSketchEventsProcessed) +
             StringPrintf("%s  mLastSlowEventTime=%" PRId64 "\n", prefix, mLastSlowEventTime) +
             StringPrintf("%s  mNumEventsSinceLastSlowEventReport = %zu\n", prefix,
                          mNumEventsSinceLastSlowEventReport) +
             StringPrintf("%s  mNumSkippedSlowEvents = %zu\n", prefix, mNumSkippedSlowEvents);
 }

 } // namespace android::inputdispatcher
	/*
	* Copyright (C) 2021 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.
	*/

	#define LOG_TAG "LatencyAggregator"
	#include "LatencyAggregator.h"

	#include <inttypes.h>

	#include <android-base/stringprintf.h>
	#include <input/Input.h>
	#include <log/log.h>
	#include <server_configurable_flags/get_flags.h>

	using android::base::StringPrintf;
	using dist_proc::aggregation::KllQuantile;
	using std::chrono_literals::operator""ms;

	// Convert the provided nanoseconds into hundreds of microseconds.
	// Use hundreds of microseconds (as opposed to microseconds) to preserve space.
	static inline int64_t ns2hus(nsecs_t nanos) {
	return ns2us(nanos) / 100;
	}

	// The maximum number of events that we will store in the statistics. Any events that we will
	// receive after we have reached this number will be ignored. We could also implement this by
	// checking the actual size of the current data and making sure that we do not go over. However,
	// the serialization process of sketches is too heavy (1 ms for all 14 sketches), and would be too
	// much to do (even if infrequently).
	// The value here has been determined empirically.
	static constexpr size_t MAX_EVENTS_FOR_STATISTICS = 20000;

	// Category (=namespace) name for the input settings that are applied at boot time
	static const char* INPUT_NATIVE_BOOT = "input_native_boot";
	// Feature flag name for the threshold of end-to-end touch latency that would trigger
	// SlowEventReported atom to be pushed
	static const char* SLOW_EVENT_MIN_REPORTING_LATENCY_MILLIS =
	"slow_event_min_reporting_latency_millis";
	// Feature flag name for the minimum delay before reporting a slow event after having just reported
	// a slow event. This helps limit the amount of data sent to the server
	static const char* SLOW_EVENT_MIN_REPORTING_INTERVAL_MILLIS =
	"slow_event_min_reporting_interval_millis";

	// If an event has end-to-end latency > 200 ms, it will get reported as a slow event.
	std::chrono::milliseconds DEFAULT_SLOW_EVENT_MIN_REPORTING_LATENCY = 200ms;
	// If we receive two slow events less than 1 min apart, we will only report 1 of them.
	std::chrono::milliseconds DEFAULT_SLOW_EVENT_MIN_REPORTING_INTERVAL = 60000ms;

	static std::chrono::milliseconds getSlowEventMinReportingLatency() {
	std::string millis = server_configurable_flags::
	GetServerConfigurableFlag(INPUT_NATIVE_BOOT, SLOW_EVENT_MIN_REPORTING_LATENCY_MILLIS,
	std::to_string(
	DEFAULT_SLOW_EVENT_MIN_REPORTING_LATENCY.count()));
	return std::chrono::milliseconds(std::stoi(millis));
	}

	static std::chrono::milliseconds getSlowEventMinReportingInterval() {
	std::string millis = server_configurable_flags::
	GetServerConfigurableFlag(INPUT_NATIVE_BOOT, SLOW_EVENT_MIN_REPORTING_INTERVAL_MILLIS,
	std::to_string(
	DEFAULT_SLOW_EVENT_MIN_REPORTING_INTERVAL.count()));
	return std::chrono::milliseconds(std::stoi(millis));
	}

	namespace android::inputdispatcher {

	/**
	* Same as android::util::BytesField, but doesn't store raw pointers, and therefore deletes its
	* resources automatically.
	*/
	class SafeBytesField {
	public:
	explicit SafeBytesField(dist_proc::aggregation::KllQuantile& quantile) {
	const zetasketch::android::AggregatorStateProto aggProto = quantile.SerializeToProto();
	mBuffer.resize(aggProto.ByteSizeLong());
	aggProto.SerializeToArray(mBuffer.data(), mBuffer.size());
	}
	android::util::BytesField getBytesField() {
	return android::util::BytesField(mBuffer.data(), mBuffer.size());
	}

	private:
	std::vector<char> mBuffer;
	};

	LatencyAggregator::LatencyAggregator() {
	AStatsManager_setPullAtomCallback(android::util::INPUT_EVENT_LATENCY_SKETCH, nullptr,
	LatencyAggregator::pullAtomCallback, this);
	dist_proc::aggregation::KllQuantileOptions options;
	options.set_inv_eps(100); // Request precision of 1.0%, instead of default 0.1%
	for (size_t i = 0; i < SketchIndex::SIZE; i++) {
	mDownSketches[i] = KllQuantile::Create(options);
	mMoveSketches[i] = KllQuantile::Create(options);
	}
	}

	LatencyAggregator::~LatencyAggregator() {
	AStatsManager_clearPullAtomCallback(android::util::INPUT_EVENT_LATENCY_SKETCH);
	}

	AStatsManager_PullAtomCallbackReturn LatencyAggregator::pullAtomCallback(int32_t atomTag,
	AStatsEventList* data,
	void* cookie) {
	LatencyAggregator* pAggregator = reinterpret_cast<LatencyAggregator*>(cookie);
	if (pAggregator == nullptr) {
	LOG_ALWAYS_FATAL("pAggregator is null!");
	}
	return pAggregator->pullData(data);
	}

	void LatencyAggregator::processTimeline(const InputEventTimeline& timeline) {
	processStatistics(timeline);
	processSlowEvent(timeline);
	}

	void LatencyAggregator::processStatistics(const InputEventTimeline& timeline) {
	// Before we do any processing, check that we have not yet exceeded MAX_SIZE
	if (mNumSketchEventsProcessed >= MAX_EVENTS_FOR_STATISTICS) {
	return;
	}
	mNumSketchEventsProcessed++;

	std::array<std::unique_ptr<KllQuantile>, SketchIndex::SIZE>& sketches =
	timeline.isDown ? mDownSketches : mMoveSketches;

	// Process common ones first
	const nsecs_t eventToRead = timeline.readTime - timeline.eventTime;
	sketches[SketchIndex::EVENT_TO_READ]->Add(ns2hus(eventToRead));

	// Now process per-connection ones
	for (const auto& [connectionToken, connectionTimeline] : timeline.connectionTimelines) {
	if (!connectionTimeline.isComplete()) {
	continue;
	}
	const nsecs_t readToDeliver = connectionTimeline.deliveryTime - timeline.readTime;
	const nsecs_t deliverToConsume =
	connectionTimeline.consumeTime - connectionTimeline.deliveryTime;
	const nsecs_t consumeToFinish =
	connectionTimeline.finishTime - connectionTimeline.consumeTime;
	const nsecs_t gpuCompletedTime =
	connectionTimeline.graphicsTimeline[GraphicsTimeline::GPU_COMPLETED_TIME];
	const nsecs_t presentTime =
	connectionTimeline.graphicsTimeline[GraphicsTimeline::PRESENT_TIME];
	const nsecs_t consumeToGpuComplete = gpuCompletedTime - connectionTimeline.consumeTime;
	const nsecs_t gpuCompleteToPresent = presentTime - gpuCompletedTime;
	const nsecs_t endToEnd = presentTime - timeline.eventTime;

	sketches[SketchIndex::READ_TO_DELIVER]->Add(ns2hus(readToDeliver));
	sketches[SketchIndex::DELIVER_TO_CONSUME]->Add(ns2hus(deliverToConsume));
	sketches[SketchIndex::CONSUME_TO_FINISH]->Add(ns2hus(consumeToFinish));
	sketches[SketchIndex::CONSUME_TO_GPU_COMPLETE]->Add(ns2hus(consumeToGpuComplete));
	sketches[SketchIndex::GPU_COMPLETE_TO_PRESENT]->Add(ns2hus(gpuCompleteToPresent));
	sketches[SketchIndex::END_TO_END]->Add(ns2hus(endToEnd));
	}
	}

	AStatsManager_PullAtomCallbackReturn LatencyAggregator::pullData(AStatsEventList* data) {
	std::array<std::unique_ptr<SafeBytesField>, SketchIndex::SIZE> serializedDownData;
	std::array<std::unique_ptr<SafeBytesField>, SketchIndex::SIZE> serializedMoveData;
	for (size_t i = 0; i < SketchIndex::SIZE; i++) {
	serializedDownData[i] = std::make_unique<SafeBytesField>(*mDownSketches[i]);
	serializedMoveData[i] = std::make_unique<SafeBytesField>(*mMoveSketches[i]);
	}
	android::util::
	addAStatsEvent(data, android::util::INPUT_EVENT_LATENCY_SKETCH,
	// DOWN sketches
	serializedDownData[SketchIndex::EVENT_TO_READ]->getBytesField(),
	serializedDownData[SketchIndex::READ_TO_DELIVER]->getBytesField(),
	serializedDownData[SketchIndex::DELIVER_TO_CONSUME]->getBytesField(),
	serializedDownData[SketchIndex::CONSUME_TO_FINISH]->getBytesField(),
	serializedDownData[SketchIndex::CONSUME_TO_GPU_COMPLETE]
	->getBytesField(),
	serializedDownData[SketchIndex::GPU_COMPLETE_TO_PRESENT]
	->getBytesField(),
	serializedDownData[SketchIndex::END_TO_END]->getBytesField(),
	// MOVE sketches
	serializedMoveData[SketchIndex::EVENT_TO_READ]->getBytesField(),
	serializedMoveData[SketchIndex::READ_TO_DELIVER]->getBytesField(),
	serializedMoveData[SketchIndex::DELIVER_TO_CONSUME]->getBytesField(),
	serializedMoveData[SketchIndex::CONSUME_TO_FINISH]->getBytesField(),
	serializedMoveData[SketchIndex::CONSUME_TO_GPU_COMPLETE]
	->getBytesField(),
	serializedMoveData[SketchIndex::GPU_COMPLETE_TO_PRESENT]
	->getBytesField(),
	serializedMoveData[SketchIndex::END_TO_END]->getBytesField());

	for (size_t i = 0; i < SketchIndex::SIZE; i++) {
	mDownSketches[i]->Reset();
	mMoveSketches[i]->Reset();
	}
	// Start new aggregations
	mNumSketchEventsProcessed = 0;
	return AStatsManager_PULL_SUCCESS;
	}

	void LatencyAggregator::processSlowEvent(const InputEventTimeline& timeline) {
	static const std::chrono::duration sSlowEventThreshold = getSlowEventMinReportingLatency();
	static const std::chrono::duration sSlowEventReportingInterval =
	getSlowEventMinReportingInterval();
	for (const auto& [token, connectionTimeline] : timeline.connectionTimelines) {
	if (!connectionTimeline.isComplete()) {
	continue;
	}
	mNumEventsSinceLastSlowEventReport++;
	const nsecs_t presentTime =
	connectionTimeline.graphicsTimeline[GraphicsTimeline::PRESENT_TIME];
	const std::chrono::nanoseconds endToEndLatency =
	std::chrono::nanoseconds(presentTime - timeline.eventTime);
	if (endToEndLatency < sSlowEventThreshold) {
	continue;
	}
	// This is a slow event. Before we report it, check if we are reporting too often
	const std::chrono::duration elapsedSinceLastReport =
	std::chrono::nanoseconds(timeline.eventTime - mLastSlowEventTime);
	if (elapsedSinceLastReport < sSlowEventReportingInterval) {
	mNumSkippedSlowEvents++;
	continue;
	}

	const nsecs_t eventToRead = timeline.readTime - timeline.eventTime;
	const nsecs_t readToDeliver = connectionTimeline.deliveryTime - timeline.readTime;
	const nsecs_t deliverToConsume =
	connectionTimeline.consumeTime - connectionTimeline.deliveryTime;
	const nsecs_t consumeToFinish =
	connectionTimeline.finishTime - connectionTimeline.consumeTime;
	const nsecs_t gpuCompletedTime =
	connectionTimeline.graphicsTimeline[GraphicsTimeline::GPU_COMPLETED_TIME];
	const nsecs_t consumeToGpuComplete = gpuCompletedTime - connectionTimeline.consumeTime;
	const nsecs_t gpuCompleteToPresent = presentTime - gpuCompletedTime;

	android::util::stats_write(android::util::SLOW_INPUT_EVENT_REPORTED, timeline.isDown,
	static_cast<int32_t>(ns2us(eventToRead)),
	static_cast<int32_t>(ns2us(readToDeliver)),
	static_cast<int32_t>(ns2us(deliverToConsume)),
	static_cast<int32_t>(ns2us(consumeToFinish)),
	static_cast<int32_t>(ns2us(consumeToGpuComplete)),
	static_cast<int32_t>(ns2us(gpuCompleteToPresent)),
	static_cast<int32_t>(ns2us(endToEndLatency.count())),
	static_cast<int32_t>(mNumEventsSinceLastSlowEventReport),
	static_cast<int32_t>(mNumSkippedSlowEvents));
	mNumEventsSinceLastSlowEventReport = 0;
	mNumSkippedSlowEvents = 0;
	mLastSlowEventTime = timeline.readTime;
	}
	}

	std::string LatencyAggregator::dump(const char* prefix) {
	std::string sketchDump = StringPrintf("%s Sketches:\n", prefix);
	for (size_t i = 0; i < SketchIndex::SIZE; i++) {
	const int64_t numDown = mDownSketches[i]->num_values();
	SafeBytesField downBytesField(*mDownSketches[i]);
	const float downBytesKb = downBytesField.getBytesField().arg_length * 1E-3;
	const int64_t numMove = mMoveSketches[i]->num_values();
	SafeBytesField moveBytesField(*mMoveSketches[i]);
	const float moveBytesKb = moveBytesField.getBytesField().arg_length * 1E-3;
	sketchDump +=
	StringPrintf("%s mDownSketches[%zu]->num_values = %" PRId64 " size = %.1fKB"
	" mMoveSketches[%zu]->num_values = %" PRId64 " size = %.1fKB\n",
	prefix, i, numDown, downBytesKb, i, numMove, moveBytesKb);
	}

	return StringPrintf("%sLatencyAggregator:\n", prefix) + sketchDump +
	StringPrintf("%s mNumSketchEventsProcessed=%zu\n", prefix, mNumSketchEventsProcessed) +
	StringPrintf("%s mLastSlowEventTime=%" PRId64 "\n", prefix, mLastSlowEventTime) +
	StringPrintf("%s mNumEventsSinceLastSlowEventReport = %zu\n", prefix,
	mNumEventsSinceLastSlowEventReport) +
	StringPrintf("%s mNumSkippedSlowEvents = %zu\n", prefix, mNumSkippedSlowEvents);
	}

	} // namespace android::inputdispatcher