FastThread.cpp revision e4a7ce250cb94a00aa2f76e5edca1c4479dc5401
12234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten/* 22234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * Copyright (C) 2014 The Android Open Source Project 32234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * 42234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * Licensed under the Apache License, Version 2.0 (the "License"); 52234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * you may not use this file except in compliance with the License. 62234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * You may obtain a copy of the License at 72234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * 82234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * http://www.apache.org/licenses/LICENSE-2.0 92234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * 102234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * Unless required by applicable law or agreed to in writing, software 112234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * distributed under the License is distributed on an "AS IS" BASIS, 122234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 132234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * See the License for the specific language governing permissions and 142234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten * limitations under the License. 152234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten */ 162234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 172234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#define LOG_TAG "FastThread" 182234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten//#define LOG_NDEBUG 0 192234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 202234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#define ATRACE_TAG ATRACE_TAG_AUDIO 212234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 222234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#include "Configuration.h" 23e348c5b72ad889389c7c1c900c121f0fbee221b5Elliott Hughes#include <linux/futex.h> 24e348c5b72ad889389c7c1c900c121f0fbee221b5Elliott Hughes#include <sys/syscall.h> 252234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#include <utils/Log.h> 262234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#include <utils/Trace.h> 272234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#include "FastThread.h" 28045ee7ea3e42b8657869d81c917feed5fb0c2b4aGlenn Kasten#include "FastThreadDumpState.h" 292234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 302234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#define FAST_DEFAULT_NS 999999999L // ~1 sec: default time to sleep 312234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#define FAST_HOT_IDLE_NS 1000000L // 1 ms: time to sleep while hot idling 32d2123e631834a887c2d8600c3ac43dda02d47cb9Glenn Kasten#define MIN_WARMUP_CYCLES 2 // minimum number of consecutive in-range loop cycles 33d2123e631834a887c2d8600c3ac43dda02d47cb9Glenn Kasten // to wait for warmup 342234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#define MAX_WARMUP_CYCLES 10 // maximum number of loop cycles to wait for warmup 352234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 362234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kastennamespace android { 372234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 382234002b0710c8db73f82d397cb945cd541c6bbbGlenn KastenFastThread::FastThread() : Thread(false /*canCallJava*/), 39e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // re-initialized to &sInitial by subclass constructor 40e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mPrevious(NULL), mCurrent(NULL), 41e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten /* mOldTs({0, 0}), */ 42e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTsValid(false), 43e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs(-1), 44e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mPeriodNs(0), 45e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mUnderrunNs(0), 46e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOverrunNs(0), 47e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mForceNs(0), 48e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mWarmupNsMin(0), 49e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mWarmupNsMax(LONG_MAX), 50e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // re-initialized to &mDummySubclassDumpState by subclass constructor 512234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten mDummyDumpState(NULL), 52e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState(NULL), 53e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIgnoreNextOverrun(true), 54214b406c813e5baca3e4b5cdc1d986de35f09bbbGlenn Kasten#ifdef FAST_THREAD_STATISTICS 55e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // mOldLoad 56e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldLoadValid(false), 57e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mBounds(0), 58e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mFull(false), 59e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // mTcu 602234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 61e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mColdGen(0), 62e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIsWarm(false), 63e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten /* mMeasuredWarmupTs({0, 0}), */ 64e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mWarmupCycles(0), 65e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mWarmupConsecutiveInRangeCycles(0), 66e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // mDummyLogWriter 67e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mLogWriter(&mDummyLogWriter), 68e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mTimestampStatus(INVALID_OPERATION), 692234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 70e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mCommand(FastThreadState::INITIAL), 712234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#if 0 722234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten frameCount(0), 732234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 74e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mAttemptedWrite(false) 752234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten{ 76e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTs.tv_sec = 0; 77e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTs.tv_nsec = 0; 78e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_sec = 0; 79e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_nsec = 0; 802234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten} 812234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 822234002b0710c8db73f82d397cb945cd541c6bbbGlenn KastenFastThread::~FastThread() 832234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten{ 842234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten} 852234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 862234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kastenbool FastThread::threadLoop() 872234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten{ 882234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten for (;;) { 892234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 902234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // either nanosleep, sched_yield, or busy wait 91e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mSleepNs >= 0) { 92e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mSleepNs > 0) { 93e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten ALOG_ASSERT(mSleepNs < 1000000000); 94e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten const struct timespec req = {0, mSleepNs}; 952234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten nanosleep(&req, NULL); 962234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } else { 972234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten sched_yield(); 982234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 992234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 1002234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // default to long sleep for next cycle 101e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = FAST_DEFAULT_NS; 1022234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 1032234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // poll for state change 1042234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten const FastThreadState *next = poll(); 1052234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (next == NULL) { 1062234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // continue to use the default initial state until a real state is available 107e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // FIXME &sInitial not available, should save address earlier 108e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten //ALOG_ASSERT(mCurrent == &sInitial && previous == &sInitial); 109e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten next = mCurrent; 1102234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 1112234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 112e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mCommand = next->mCommand; 113e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (next != mCurrent) { 1142234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 1152234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // As soon as possible of learning of a new dump area, start using it 116e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState = next->mDumpState != NULL ? next->mDumpState : mDummyDumpState; 117e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mLogWriter = next->mNBLogWriter != NULL ? next->mNBLogWriter : &mDummyLogWriter; 118e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten setLog(mLogWriter); 1192234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 1202234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // We want to always have a valid reference to the previous (non-idle) state. 1212234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // However, the state queue only guarantees access to current and previous states. 1222234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // So when there is a transition from a non-idle state into an idle state, we make a 1232234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // copy of the last known non-idle state so it is still available on return from idle. 1242234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // The possible transitions are: 1252234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // non-idle -> non-idle update previous from current in-place 1262234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // non-idle -> idle update previous from copy of current 1272234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // idle -> idle don't update previous 1282234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // idle -> non-idle don't update previous 129e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (!(mCurrent->mCommand & FastThreadState::IDLE)) { 130e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mCommand & FastThreadState::IDLE) { 1312234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten onIdle(); 132e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTsValid = false; 133214b406c813e5baca3e4b5cdc1d986de35f09bbbGlenn Kasten#ifdef FAST_THREAD_STATISTICS 134e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldLoadValid = false; 1352234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 136e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIgnoreNextOverrun = true; 1372234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 138e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mPrevious = mCurrent; 1392234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 140e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mCurrent = next; 1412234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 1422234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#if !LOG_NDEBUG 1432234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten next = NULL; // not referenced again 1442234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 1452234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 146e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mCommand = mCommand; 1472234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 148e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // FIXME what does this comment mean? 1492234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // << current, previous, command, dumpState >> 1502234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 151e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten switch (mCommand) { 1522234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten case FastThreadState::INITIAL: 1532234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten case FastThreadState::HOT_IDLE: 154e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = FAST_HOT_IDLE_NS; 1552234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten continue; 1562234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten case FastThreadState::COLD_IDLE: 1572234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // only perform a cold idle command once 1582234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // FIXME consider checking previous state and only perform if previous != COLD_IDLE 159e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mCurrent->mColdGen != mColdGen) { 160e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten int32_t *coldFutexAddr = mCurrent->mColdFutexAddr; 1612234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ALOG_ASSERT(coldFutexAddr != NULL); 1622234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten int32_t old = android_atomic_dec(coldFutexAddr); 1632234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (old <= 0) { 164e348c5b72ad889389c7c1c900c121f0fbee221b5Elliott Hughes syscall(__NR_futex, coldFutexAddr, FUTEX_WAIT_PRIVATE, old - 1, NULL); 1652234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 1662234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten int policy = sched_getscheduler(0); 1672234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (!(policy == SCHED_FIFO || policy == SCHED_RR)) { 1682234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ALOGE("did not receive expected priority boost"); 1692234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 1702234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // This may be overly conservative; there could be times that the normal mixer 1712234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // requests such a brief cold idle that it doesn't require resetting this flag. 172e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIsWarm = false; 173e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_sec = 0; 174e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_nsec = 0; 175e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mWarmupCycles = 0; 176e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mWarmupConsecutiveInRangeCycles = 0; 177e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = -1; 178e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mColdGen = mCurrent->mColdGen; 179214b406c813e5baca3e4b5cdc1d986de35f09bbbGlenn Kasten#ifdef FAST_THREAD_STATISTICS 180e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mBounds = 0; 181e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mFull = false; 1822234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 183e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTsValid = !clock_gettime(CLOCK_MONOTONIC, &mOldTs); 184e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mTimestampStatus = INVALID_OPERATION; 1852234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } else { 186e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = FAST_HOT_IDLE_NS; 1872234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 1882234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten continue; 1892234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten case FastThreadState::EXIT: 1902234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten onExit(); 1912234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten return false; 1922234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten default: 193e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten LOG_ALWAYS_FATAL_IF(!isSubClassCommand(mCommand)); 1942234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten break; 1952234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 1962234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 1972234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // there is a non-idle state available to us; did the state change? 198e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mCurrent != mPrevious) { 1992234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten onStateChange(); 2002234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#if 1 // FIXME shouldn't need this 2012234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // only process state change once 202e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mPrevious = mCurrent; 2032234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 2042234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 2052234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 2062234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // do work using current state here 207e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mAttemptedWrite = false; 2082234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten onWork(); 2092234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 2102234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // To be exactly periodic, compute the next sleep time based on current time. 2112234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // This code doesn't have long-term stability when the sink is non-blocking. 2122234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // FIXME To avoid drift, use the local audio clock or watch the sink's fill status. 2132234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten struct timespec newTs; 2142234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten int rc = clock_gettime(CLOCK_MONOTONIC, &newTs); 2152234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (rc == 0) { 216e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten //mLogWriter->logTimestamp(newTs); 217e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mOldTsValid) { 218e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten time_t sec = newTs.tv_sec - mOldTs.tv_sec; 219e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten long nsec = newTs.tv_nsec - mOldTs.tv_nsec; 2202234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ALOGE_IF(sec < 0 || (sec == 0 && nsec < 0), 2212234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten "clock_gettime(CLOCK_MONOTONIC) failed: was %ld.%09ld but now %ld.%09ld", 222e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTs.tv_sec, mOldTs.tv_nsec, newTs.tv_sec, newTs.tv_nsec); 2232234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (nsec < 0) { 2242234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten --sec; 2252234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten nsec += 1000000000; 2262234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 2272234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // To avoid an initial underrun on fast tracks after exiting standby, 2282234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // do not start pulling data from tracks and mixing until warmup is complete. 2292234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // Warmup is considered complete after the earlier of: 230d2123e631834a887c2d8600c3ac43dda02d47cb9Glenn Kasten // MIN_WARMUP_CYCLES consecutive in-range write() attempts, 231e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // where "in-range" means mWarmupNsMin <= cycle time <= mWarmupNsMax 2322234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // MAX_WARMUP_CYCLES write() attempts. 2332234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // This is overly conservative, but to get better accuracy requires a new HAL API. 234e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (!mIsWarm && mAttemptedWrite) { 235e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_sec += sec; 236e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_nsec += nsec; 237e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mMeasuredWarmupTs.tv_nsec >= 1000000000) { 238e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_sec++; 239e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mMeasuredWarmupTs.tv_nsec -= 1000000000; 2402234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 241e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten ++mWarmupCycles; 242e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mWarmupNsMin <= nsec && nsec <= mWarmupNsMax) { 243e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten ALOGV("warmup cycle %d in range: %.03f ms", mWarmupCycles, nsec * 1e-9); 244e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten ++mWarmupConsecutiveInRangeCycles; 245d2123e631834a887c2d8600c3ac43dda02d47cb9Glenn Kasten } else { 246e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten ALOGV("warmup cycle %d out of range: %.03f ms", mWarmupCycles, nsec * 1e-9); 247e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mWarmupConsecutiveInRangeCycles = 0; 248d2123e631834a887c2d8600c3ac43dda02d47cb9Glenn Kasten } 249e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if ((mWarmupConsecutiveInRangeCycles >= MIN_WARMUP_CYCLES) || 250e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten (mWarmupCycles >= MAX_WARMUP_CYCLES)) { 251e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIsWarm = true; 252e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mMeasuredWarmupTs = mMeasuredWarmupTs; 253e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mWarmupCycles = mWarmupCycles; 2542234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 2552234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 256e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = -1; 257e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mIsWarm) { 258e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (sec > 0 || nsec > mUnderrunNs) { 2592234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ATRACE_NAME("underrun"); 2602234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // FIXME only log occasionally 2612234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ALOGV("underrun: time since last cycle %d.%03ld sec", 2622234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten (int) sec, nsec / 1000000L); 263e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mUnderruns++; 264e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIgnoreNextOverrun = true; 265e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten } else if (nsec < mOverrunNs) { 266e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mIgnoreNextOverrun) { 267e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIgnoreNextOverrun = false; 2682234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } else { 2692234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // FIXME only log occasionally 2702234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ALOGV("overrun: time since last cycle %d.%03ld sec", 2712234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten (int) sec, nsec / 1000000L); 272e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mOverruns++; 2732234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 2742234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // This forces a minimum cycle time. It: 2752234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // - compensates for an audio HAL with jitter due to sample rate conversion 2762234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // - works with a variable buffer depth audio HAL that never pulls at a 277e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten // rate < than mOverrunNs per buffer. 2782234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // - recovers from overrun immediately after underrun 2792234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // It doesn't work with a non-blocking audio HAL. 280e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = mForceNs - nsec; 2812234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } else { 282e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIgnoreNextOverrun = false; 2832234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 2842234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 285214b406c813e5baca3e4b5cdc1d986de35f09bbbGlenn Kasten#ifdef FAST_THREAD_STATISTICS 286e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mIsWarm) { 2872234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // advance the FIFO queue bounds 288e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten size_t i = mBounds & (mDumpState->mSamplingN - 1); 289e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mBounds = (mBounds & 0xFFFF0000) | ((mBounds + 1) & 0xFFFF); 290e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mFull) { 291e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mBounds += 0x10000; 292e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten } else if (!(mBounds & (mDumpState->mSamplingN - 1))) { 293e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mFull = true; 2942234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 2952234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // compute the delta value of clock_gettime(CLOCK_MONOTONIC) 2962234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten uint32_t monotonicNs = nsec; 2972234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (sec > 0 && sec < 4) { 2982234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten monotonicNs += sec * 1000000000; 2992234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 3002234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // compute raw CPU load = delta value of clock_gettime(CLOCK_THREAD_CPUTIME_ID) 3012234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten uint32_t loadNs = 0; 3022234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten struct timespec newLoad; 3032234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &newLoad); 3042234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (rc == 0) { 305e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten if (mOldLoadValid) { 306e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten sec = newLoad.tv_sec - mOldLoad.tv_sec; 307e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten nsec = newLoad.tv_nsec - mOldLoad.tv_nsec; 3082234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (nsec < 0) { 3092234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten --sec; 3102234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten nsec += 1000000000; 3112234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 3122234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten loadNs = nsec; 3132234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten if (sec > 0 && sec < 4) { 3142234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten loadNs += sec * 1000000000; 3152234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 3162234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } else { 3172234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // first time through the loop 318e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldLoadValid = true; 3192234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 320e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldLoad = newLoad; 3212234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 3222234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#ifdef CPU_FREQUENCY_STATISTICS 3232234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // get the absolute value of CPU clock frequency in kHz 3242234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten int cpuNum = sched_getcpu(); 325e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten uint32_t kHz = mTcu.getCpukHz(cpuNum); 3262234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten kHz = (kHz << 4) | (cpuNum & 0xF); 3272234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 3282234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // save values in FIFO queues for dumpsys 3292234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // these stores #1, #2, #3 are not atomic with respect to each other, 3302234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // or with respect to store #4 below 331e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mMonotonicNs[i] = monotonicNs; 332e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mLoadNs[i] = loadNs; 3332234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#ifdef CPU_FREQUENCY_STATISTICS 334e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mCpukHz[i] = kHz; 3352234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 3362234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // this store #4 is not atomic with respect to stores #1, #2, #3 above, but 3372234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // the newest open & oldest closed halves are atomic with respect to each other 338e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mDumpState->mBounds = mBounds; 3392234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ATRACE_INT("cycle_ms", monotonicNs / 1000000); 3402234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten ATRACE_INT("load_us", loadNs / 1000); 3412234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 3422234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten#endif 3432234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } else { 3442234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // first time through the loop 345e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTsValid = true; 346e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = mPeriodNs; 347e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mIgnoreNextOverrun = true; 3482234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 349e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTs = newTs; 3502234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } else { 3512234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // monotonic clock is broken 352e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mOldTsValid = false; 353e4a7ce250cb94a00aa2f76e5edca1c4479dc5401Glenn Kasten mSleepNs = mPeriodNs; 3542234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } 3552234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 3562234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten } // for (;;) 3572234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 3582234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten // never return 'true'; Thread::_threadLoop() locks mutex which can result in priority inversion 3592234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten} 3602234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten 3612234002b0710c8db73f82d397cb945cd541c6bbbGlenn Kasten} // namespace android 362