Spatializer: Add rate based stats (44d648b4) · Commits · e / os / android_frameworks_av

media/utils/Android.bp

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	@@ -37,6 +37,7 @@ cc_library {
	"ProcessInfo.cpp",		"ProcessInfo.cpp",
	"SchedulingPolicyService.cpp",		"SchedulingPolicyService.cpp",
	"ServiceUtilities.cpp",		"ServiceUtilities.cpp",
			"ThreadSnapshot.cpp",
	"TimeCheck.cpp",		"TimeCheck.cpp",
	"TimerThread.cpp",		"TimerThread.cpp",
	],		],

media/utils/ThreadSnapshot.cpp

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			/*
			* Copyright (C) 2022 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 "ThreadSnapshot"
			#include <utils/Log.h>
			#include <utils/Timers.h>
			#include <mediautils/ThreadSnapshot.h>

			#include <mediautils/Process.h>

			namespace android::mediautils {

			pid_t ThreadSnapshot::getTid() const {
			std::lock_guard lg(mLock);
			return mState.mTid;
			}

			void ThreadSnapshot::setTid(pid_t tid) {
			std::lock_guard lg(mLock);
			if (mState.mTid == tid) return;
			mState.reset(tid);
			}

			void ThreadSnapshot::reset() {
			std::lock_guard lg(mLock);
			mState.reset(mState.mTid);
			}

			void ThreadSnapshot::onBegin() {
			std::string sched = getThreadSchedAsString(getTid()); // tid could race here,
			// accept as benign.
			std::lock_guard lg(mLock);
			mState.onBegin(std::move(sched));
			}

			void ThreadSnapshot::onEnd() {
			std::lock_guard lg(mLock);
			mState.onEnd();
			}

			std::string ThreadSnapshot::toString() const {
			// Make a local copy of the stats data under lock.
			State state;
			{
			std::lock_guard lg(mLock);
			state = mState;
			}
			return state.toString();
			}

			void ThreadSnapshot::State::reset(pid_t tid) {
			mTid = tid;
			mBeginTimeNs = -2;
			mEndTimeNs = -1;
			mCumulativeTimeNs = 0;
			mBeginSched.clear();
			}

			void ThreadSnapshot::State::onBegin(std::string sched) {
			if (mBeginTimeNs < mEndTimeNs) {
			mBeginTimeNs = systemTime();
			mBeginSched = std::move(sched);
			}
			}

			void ThreadSnapshot::State::onEnd() {
			if (mEndTimeNs < mBeginTimeNs) {
			mEndTimeNs = systemTime();
			mCumulativeTimeNs += mEndTimeNs - mBeginTimeNs;
			}
			}

			std::string ThreadSnapshot::State::toString() const {
			if (mBeginTimeNs < 0) return {}; // never begun.

			// compute time intervals.
			const int64_t nowNs = systemTime();
			int64_t cumulativeTimeNs = mCumulativeTimeNs;
			int64_t diffNs = mEndTimeNs - mBeginTimeNs; // if onEnd() isn't matched, diffNs < 0.
			if (diffNs < 0) {
			diffNs = nowNs - mBeginTimeNs;
			cumulativeTimeNs += diffNs;
			}
			// normalization for rate variables
			const double lastRunPerSec = 1e9 / diffNs;
			const double totalPerSec = 1e9 / cumulativeTimeNs;

			// HANDLE THE SCHEDULER STATISTICS HERE
			// current and differential statistics for the scheduler.
			std::string schedNow = getThreadSchedAsString(mTid);
			const auto schedMapThen = parseThreadSchedString(mBeginSched);
			const auto schedMapNow = parseThreadSchedString(schedNow);
			static const char * schedDiffKeyList[] = {
			"se.sum_exec_runtime",
			"se.nr_migrations",
			"se.statistics.wait_sum",
			"se.statistics.wait_count",
			"se.statistics.iowait_sum",
			"se.statistics.iowait_count",
			"se.statistics.nr_forced_migrations",
			"nr_involuntary_switches",
			};

			// compute differential rate statistics.
			std::string diffString;
			for (const auto diffKey : schedDiffKeyList) {
			if (auto itThen = schedMapThen.find(diffKey);
			itThen != schedMapThen.end()) {

			if (auto itNow = schedMapNow.find(diffKey);
			itNow != schedMapNow.end()) {
			auto diff = itNow->second - itThen->second;
			diff *= lastRunPerSec;
			auto total = itNow->second * totalPerSec;
			diffString.append(diffKey).append(" last-run:")
			.append(std::to_string(diff))
			.append(" cumulative:")
			.append(std::to_string(total))
			.append("\n");
			}
			}
			}

			if (!diffString.empty()) {
			schedNow.append("* per second stats *\n").append(diffString);
			}

			// Return snapshot string.
			return schedNow;
			}

			} // android::mediautils

media/utils/include/mediautils/ThreadSnapshot.h

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			/*
			* Copyright (C) 2022 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.
			*/

			#pragma once

			#include <mutex>
			#include <string>

			#include <android-base/thread_annotations.h>

			namespace android::mediautils {

			/**
			* Collect Thread performance statistics.
			*
			* An onBegin() and onEnd() signal a continuous "run".
			* Statistics are returned by toString().
			*/
			class ThreadSnapshot {
			public:
			explicit ThreadSnapshot(pid_t tid = -1) { mState.reset(tid); };

			// Returns current tid
			pid_t getTid() const;

			// Sets the tid
			void setTid(pid_t tid);

			// Reset statistics, keep same tid.
			void reset();

			// Signal a timing run is beginning
			void onBegin();

			// Signal a timing run is ending
			void onEnd();

			// Return the thread snapshot statistics in a string
			std::string toString() const;

			private:
			mutable std::mutex mLock;

			// State represents our statistics at a given point in time.
			// It is not thread-safe, so any locking must occur at the caller.
			struct State {
			pid_t mTid;
			int64_t mBeginTimeNs; // when last run began
			int64_t mEndTimeNs; // when last run ends (if less than begin time, not started)
			int64_t mCumulativeTimeNs;

			// Sched is the scheduler statistics obtained as a string.
			// This is parsed only when toString() is called.
			std::string mBeginSched;

			// Clears existing state.
			void reset(pid_t tid);

			// onBegin() takes a std::string sched should can be captured outside
			// of locking.
			void onBegin(std::string sched);
			void onEnd();
			std::string toString() const;
			};

			// Our current state. We only keep the current running state.
			State mState GUARDED_BY(mLock);
			};

			} // android::mediautils

media/utils/tests/Android.bp

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	@@ -103,6 +103,26 @@ cc_test {
	],		],
	}		}

			cc_test {
			name: "media_threadsnapshot_tests",

			cflags: [
			"-Wall",
			"-Werror",
			"-Wextra",
			],

			shared_libs: [
			"liblog",
			"libmediautils",
			"libutils",
			],

			srcs: [
			"media_threadsnapshot_tests.cpp",
			],
			}

	cc_test {		cc_test {
	name: "methodstatistics_tests",		name: "methodstatistics_tests",

media/utils/tests/media_threadsnapshot_tests.cpp

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			/*
			* Copyright (C) 2022 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 <mediautils/ThreadSnapshot.h>

			#define LOG_TAG "media_threadsnapshot_tests"

			#include <gtest/gtest.h>
			#include <utils/Log.h>

			#include <chrono>
			#include <thread>

			using namespace android;
			using namespace android::mediautils;

			TEST(media_threadsnapshot_tests, basic) {
			using namespace std::chrono_literals;

			ThreadSnapshot threadSnapshot(gettid());

			threadSnapshot.onBegin();

			std::string snapshot1 = threadSnapshot.toString();

			std::this_thread::sleep_for(100ms);

			threadSnapshot.onEnd();

			std::string snapshot2 = threadSnapshot.toString();

			// Either we can't get a snapshot, or they must be different when taken when thread is running.
			if (snapshot1.empty()) {
			ASSERT_TRUE(snapshot2.empty());
			} else {
			ASSERT_FALSE(snapshot2.empty());
			ASSERT_NE(snapshot1, snapshot2);
			}
			}