140 lines
4.3 KiB
C++
140 lines
4.3 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <time.h>
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#include <utils/Log.h>
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#include <cpustats/ThreadCpuUsage.h>
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bool ThreadCpuUsage::setEnabled(bool isEnabled)
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{
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bool wasEnabled = mIsEnabled;
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// only do something if there is a change
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if (isEnabled != wasEnabled) {
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int rc;
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// enabling
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if (isEnabled) {
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rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &mPreviousTs);
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if (rc) {
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LOGE("clock_gettime(CLOCK_THREAD_CPUTIME_ID) errno=%d", errno);
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isEnabled = false;
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} else {
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mWasEverEnabled = true;
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// record wall clock time at first enable
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if (!mMonotonicKnown) {
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rc = clock_gettime(CLOCK_MONOTONIC, &mMonotonicTs);
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if (rc) {
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LOGE("clock_gettime(CLOCK_MONOTONIC) errno=%d", errno);
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} else {
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mMonotonicKnown = true;
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}
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}
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}
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// disabling
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} else {
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struct timespec ts;
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rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
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if (rc) {
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LOGE("clock_gettime(CLOCK_THREAD_CPUTIME_ID) errno=%d", errno);
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} else {
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long long delta = (ts.tv_sec - mPreviousTs.tv_sec) * 1000000000LL +
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(ts.tv_nsec - mPreviousTs.tv_nsec);
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mAccumulator += delta;
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#if 0
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mPreviousTs = ts;
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#endif
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}
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}
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mIsEnabled = isEnabled;
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}
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return wasEnabled;
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}
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void ThreadCpuUsage::sampleAndEnable()
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{
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bool wasEverEnabled = mWasEverEnabled;
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if (enable()) {
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// already enabled, so add a new sample relative to previous
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sample();
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} else if (wasEverEnabled) {
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// was disabled, but add sample for accumulated time while enabled
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mStatistics.sample((double) mAccumulator);
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mAccumulator = 0;
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}
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}
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void ThreadCpuUsage::sample()
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{
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if (mWasEverEnabled) {
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if (mIsEnabled) {
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struct timespec ts;
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int rc;
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rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
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if (rc) {
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LOGE("clock_gettime(CLOCK_THREAD_CPUTIME_ID) errno=%d", errno);
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} else {
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long long delta = (ts.tv_sec - mPreviousTs.tv_sec) * 1000000000LL +
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(ts.tv_nsec - mPreviousTs.tv_nsec);
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mAccumulator += delta;
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mPreviousTs = ts;
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}
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} else {
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mWasEverEnabled = false;
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}
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mStatistics.sample((double) mAccumulator);
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mAccumulator = 0;
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} else {
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LOGW("Can't add sample because measurements have never been enabled");
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}
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}
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long long ThreadCpuUsage::elapsed() const
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{
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long long elapsed;
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if (mMonotonicKnown) {
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struct timespec ts;
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int rc;
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rc = clock_gettime(CLOCK_MONOTONIC, &ts);
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if (rc) {
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LOGE("clock_gettime(CLOCK_MONOTONIC) errno=%d", errno);
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elapsed = 0;
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} else {
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// mMonotonicTs is updated only at first enable and resetStatistics
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elapsed = (ts.tv_sec - mMonotonicTs.tv_sec) * 1000000000LL +
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(ts.tv_nsec - mMonotonicTs.tv_nsec);
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}
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} else {
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LOGW("Can't compute elapsed time because measurements have never been enabled");
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elapsed = 0;
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}
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return elapsed;
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}
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void ThreadCpuUsage::resetStatistics()
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{
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mStatistics.reset();
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if (mMonotonicKnown) {
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int rc;
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rc = clock_gettime(CLOCK_MONOTONIC, &mMonotonicTs);
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if (rc) {
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LOGE("clock_gettime(CLOCK_MONOTONIC) errno=%d", errno);
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mMonotonicKnown = false;
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}
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}
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}
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