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-rw-r--r--services/audioflinger/FastMixerDumpState.cpp252
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diff --git a/services/audioflinger/FastMixerDumpState.cpp b/services/audioflinger/FastMixerDumpState.cpp
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+/*
+ * Copyright (C) 2014 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 "FastMixerDumpState"
+//#define LOG_NDEBUG 0
+
+#include "Configuration.h"
+#ifdef FAST_MIXER_STATISTICS
+#include <cpustats/CentralTendencyStatistics.h>
+#ifdef CPU_FREQUENCY_STATISTICS
+#include <cpustats/ThreadCpuUsage.h>
+#endif
+#endif
+#include <utils/Debug.h>
+#include <utils/Log.h>
+#include "FastMixerDumpState.h"
+
+namespace android {
+
+FastMixerDumpState::FastMixerDumpState(
+#ifdef FAST_MIXER_STATISTICS
+ uint32_t samplingN
+#endif
+ ) : FastThreadDumpState(),
+ mWriteSequence(0), mFramesWritten(0),
+ mNumTracks(0), mWriteErrors(0),
+ mSampleRate(0), mFrameCount(0),
+ mTrackMask(0)
+{
+#ifdef FAST_MIXER_STATISTICS
+ increaseSamplingN(samplingN);
+#endif
+}
+
+#ifdef FAST_MIXER_STATISTICS
+void FastMixerDumpState::increaseSamplingN(uint32_t samplingN)
+{
+ if (samplingN <= mSamplingN || samplingN > kSamplingN || roundup(samplingN) != samplingN) {
+ return;
+ }
+ uint32_t additional = samplingN - mSamplingN;
+ // sample arrays aren't accessed atomically with respect to the bounds,
+ // so clearing reduces chance for dumpsys to read random uninitialized samples
+ memset(&mMonotonicNs[mSamplingN], 0, sizeof(mMonotonicNs[0]) * additional);
+ memset(&mLoadNs[mSamplingN], 0, sizeof(mLoadNs[0]) * additional);
+#ifdef CPU_FREQUENCY_STATISTICS
+ memset(&mCpukHz[mSamplingN], 0, sizeof(mCpukHz[0]) * additional);
+#endif
+ mSamplingN = samplingN;
+}
+#endif
+
+FastMixerDumpState::~FastMixerDumpState()
+{
+}
+
+// helper function called by qsort()
+static int compare_uint32_t(const void *pa, const void *pb)
+{
+ uint32_t a = *(const uint32_t *)pa;
+ uint32_t b = *(const uint32_t *)pb;
+ if (a < b) {
+ return -1;
+ } else if (a > b) {
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+void FastMixerDumpState::dump(int fd) const
+{
+ if (mCommand == FastMixerState::INITIAL) {
+ dprintf(fd, " FastMixer not initialized\n");
+ return;
+ }
+#define COMMAND_MAX 32
+ char string[COMMAND_MAX];
+ switch (mCommand) {
+ case FastMixerState::INITIAL:
+ strcpy(string, "INITIAL");
+ break;
+ case FastMixerState::HOT_IDLE:
+ strcpy(string, "HOT_IDLE");
+ break;
+ case FastMixerState::COLD_IDLE:
+ strcpy(string, "COLD_IDLE");
+ break;
+ case FastMixerState::EXIT:
+ strcpy(string, "EXIT");
+ break;
+ case FastMixerState::MIX:
+ strcpy(string, "MIX");
+ break;
+ case FastMixerState::WRITE:
+ strcpy(string, "WRITE");
+ break;
+ case FastMixerState::MIX_WRITE:
+ strcpy(string, "MIX_WRITE");
+ break;
+ default:
+ snprintf(string, COMMAND_MAX, "%d", mCommand);
+ break;
+ }
+ double measuredWarmupMs = (mMeasuredWarmupTs.tv_sec * 1000.0) +
+ (mMeasuredWarmupTs.tv_nsec / 1000000.0);
+ double mixPeriodSec = (double) mFrameCount / (double) mSampleRate;
+ dprintf(fd, " FastMixer command=%s writeSequence=%u framesWritten=%u\n"
+ " numTracks=%u writeErrors=%u underruns=%u overruns=%u\n"
+ " sampleRate=%u frameCount=%zu measuredWarmup=%.3g ms, warmupCycles=%u\n"
+ " mixPeriod=%.2f ms\n",
+ string, mWriteSequence, mFramesWritten,
+ mNumTracks, mWriteErrors, mUnderruns, mOverruns,
+ mSampleRate, mFrameCount, measuredWarmupMs, mWarmupCycles,
+ mixPeriodSec * 1e3);
+#ifdef FAST_MIXER_STATISTICS
+ // find the interval of valid samples
+ uint32_t bounds = mBounds;
+ uint32_t newestOpen = bounds & 0xFFFF;
+ uint32_t oldestClosed = bounds >> 16;
+ uint32_t n = (newestOpen - oldestClosed) & 0xFFFF;
+ if (n > mSamplingN) {
+ ALOGE("too many samples %u", n);
+ n = mSamplingN;
+ }
+ // statistics for monotonic (wall clock) time, thread raw CPU load in time, CPU clock frequency,
+ // and adjusted CPU load in MHz normalized for CPU clock frequency
+ CentralTendencyStatistics wall, loadNs;
+#ifdef CPU_FREQUENCY_STATISTICS
+ CentralTendencyStatistics kHz, loadMHz;
+ uint32_t previousCpukHz = 0;
+#endif
+ // Assuming a normal distribution for cycle times, three standard deviations on either side of
+ // the mean account for 99.73% of the population. So if we take each tail to be 1/1000 of the
+ // sample set, we get 99.8% combined, or close to three standard deviations.
+ static const uint32_t kTailDenominator = 1000;
+ uint32_t *tail = n >= kTailDenominator ? new uint32_t[n] : NULL;
+ // loop over all the samples
+ for (uint32_t j = 0; j < n; ++j) {
+ size_t i = oldestClosed++ & (mSamplingN - 1);
+ uint32_t wallNs = mMonotonicNs[i];
+ if (tail != NULL) {
+ tail[j] = wallNs;
+ }
+ wall.sample(wallNs);
+ uint32_t sampleLoadNs = mLoadNs[i];
+ loadNs.sample(sampleLoadNs);
+#ifdef CPU_FREQUENCY_STATISTICS
+ uint32_t sampleCpukHz = mCpukHz[i];
+ // skip bad kHz samples
+ if ((sampleCpukHz & ~0xF) != 0) {
+ kHz.sample(sampleCpukHz >> 4);
+ if (sampleCpukHz == previousCpukHz) {
+ double megacycles = (double) sampleLoadNs * (double) (sampleCpukHz >> 4) * 1e-12;
+ double adjMHz = megacycles / mixPeriodSec; // _not_ wallNs * 1e9
+ loadMHz.sample(adjMHz);
+ }
+ }
+ previousCpukHz = sampleCpukHz;
+#endif
+ }
+ if (n) {
+ dprintf(fd, " Simple moving statistics over last %.1f seconds:\n",
+ wall.n() * mixPeriodSec);
+ dprintf(fd, " wall clock time in ms per mix cycle:\n"
+ " mean=%.2f min=%.2f max=%.2f stddev=%.2f\n",
+ wall.mean()*1e-6, wall.minimum()*1e-6, wall.maximum()*1e-6,
+ wall.stddev()*1e-6);
+ dprintf(fd, " raw CPU load in us per mix cycle:\n"
+ " mean=%.0f min=%.0f max=%.0f stddev=%.0f\n",
+ loadNs.mean()*1e-3, loadNs.minimum()*1e-3, loadNs.maximum()*1e-3,
+ loadNs.stddev()*1e-3);
+ } else {
+ dprintf(fd, " No FastMixer statistics available currently\n");
+ }
+#ifdef CPU_FREQUENCY_STATISTICS
+ dprintf(fd, " CPU clock frequency in MHz:\n"
+ " mean=%.0f min=%.0f max=%.0f stddev=%.0f\n",
+ kHz.mean()*1e-3, kHz.minimum()*1e-3, kHz.maximum()*1e-3, kHz.stddev()*1e-3);
+ dprintf(fd, " adjusted CPU load in MHz (i.e. normalized for CPU clock frequency):\n"
+ " mean=%.1f min=%.1f max=%.1f stddev=%.1f\n",
+ loadMHz.mean(), loadMHz.minimum(), loadMHz.maximum(), loadMHz.stddev());
+#endif
+ if (tail != NULL) {
+ qsort(tail, n, sizeof(uint32_t), compare_uint32_t);
+ // assume same number of tail samples on each side, left and right
+ uint32_t count = n / kTailDenominator;
+ CentralTendencyStatistics left, right;
+ for (uint32_t i = 0; i < count; ++i) {
+ left.sample(tail[i]);
+ right.sample(tail[n - (i + 1)]);
+ }
+ dprintf(fd, " Distribution of mix cycle times in ms for the tails "
+ "(> ~3 stddev outliers):\n"
+ " left tail: mean=%.2f min=%.2f max=%.2f stddev=%.2f\n"
+ " right tail: mean=%.2f min=%.2f max=%.2f stddev=%.2f\n",
+ left.mean()*1e-6, left.minimum()*1e-6, left.maximum()*1e-6, left.stddev()*1e-6,
+ right.mean()*1e-6, right.minimum()*1e-6, right.maximum()*1e-6,
+ right.stddev()*1e-6);
+ delete[] tail;
+ }
+#endif
+ // The active track mask and track states are updated non-atomically.
+ // So if we relied on isActive to decide whether to display,
+ // then we might display an obsolete track or omit an active track.
+ // Instead we always display all tracks, with an indication
+ // of whether we think the track is active.
+ uint32_t trackMask = mTrackMask;
+ dprintf(fd, " Fast tracks: kMaxFastTracks=%u activeMask=%#x\n",
+ FastMixerState::kMaxFastTracks, trackMask);
+ dprintf(fd, " Index Active Full Partial Empty Recent Ready\n");
+ for (uint32_t i = 0; i < FastMixerState::kMaxFastTracks; ++i, trackMask >>= 1) {
+ bool isActive = trackMask & 1;
+ const FastTrackDump *ftDump = &mTracks[i];
+ const FastTrackUnderruns& underruns = ftDump->mUnderruns;
+ const char *mostRecent;
+ switch (underruns.mBitFields.mMostRecent) {
+ case UNDERRUN_FULL:
+ mostRecent = "full";
+ break;
+ case UNDERRUN_PARTIAL:
+ mostRecent = "partial";
+ break;
+ case UNDERRUN_EMPTY:
+ mostRecent = "empty";
+ break;
+ default:
+ mostRecent = "?";
+ break;
+ }
+ dprintf(fd, " %5u %6s %4u %7u %5u %7s %5zu\n", i, isActive ? "yes" : "no",
+ (underruns.mBitFields.mFull) & UNDERRUN_MASK,
+ (underruns.mBitFields.mPartial) & UNDERRUN_MASK,
+ (underruns.mBitFields.mEmpty) & UNDERRUN_MASK,
+ mostRecent, ftDump->mFramesReady);
+ }
+}
+
+} // android
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