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/*
* Copyright (C) 2011 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 <errno.h>
#include <time.h>
#include <utils/Log.h>
#include <cpustats/ThreadCpuUsage.h>
bool ThreadCpuUsage::setEnabled(bool isEnabled)
{
bool wasEnabled = mIsEnabled;
// only do something if there is a change
if (isEnabled != wasEnabled) {
int rc;
// enabling
if (isEnabled) {
rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &mPreviousTs);
if (rc) {
ALOGE("clock_gettime(CLOCK_THREAD_CPUTIME_ID) errno=%d", errno);
isEnabled = false;
} else {
mWasEverEnabled = true;
// record wall clock time at first enable
if (!mMonotonicKnown) {
rc = clock_gettime(CLOCK_MONOTONIC, &mMonotonicTs);
if (rc) {
ALOGE("clock_gettime(CLOCK_MONOTONIC) errno=%d", errno);
} else {
mMonotonicKnown = true;
}
}
}
// disabling
} else {
struct timespec ts;
rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
if (rc) {
ALOGE("clock_gettime(CLOCK_THREAD_CPUTIME_ID) errno=%d", errno);
} else {
long long delta = (ts.tv_sec - mPreviousTs.tv_sec) * 1000000000LL +
(ts.tv_nsec - mPreviousTs.tv_nsec);
mAccumulator += delta;
#if 0
mPreviousTs = ts;
#endif
}
}
mIsEnabled = isEnabled;
}
return wasEnabled;
}
void ThreadCpuUsage::sampleAndEnable()
{
bool wasEverEnabled = mWasEverEnabled;
if (enable()) {
// already enabled, so add a new sample relative to previous
sample();
} else if (wasEverEnabled) {
// was disabled, but add sample for accumulated time while enabled
mStatistics.sample((double) mAccumulator);
mAccumulator = 0;
}
}
void ThreadCpuUsage::sample()
{
if (mWasEverEnabled) {
if (mIsEnabled) {
struct timespec ts;
int rc;
rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
if (rc) {
ALOGE("clock_gettime(CLOCK_THREAD_CPUTIME_ID) errno=%d", errno);
} else {
long long delta = (ts.tv_sec - mPreviousTs.tv_sec) * 1000000000LL +
(ts.tv_nsec - mPreviousTs.tv_nsec);
mAccumulator += delta;
mPreviousTs = ts;
}
} else {
mWasEverEnabled = false;
}
mStatistics.sample((double) mAccumulator);
mAccumulator = 0;
} else {
ALOGW("Can't add sample because measurements have never been enabled");
}
}
long long ThreadCpuUsage::elapsed() const
{
long long elapsed;
if (mMonotonicKnown) {
struct timespec ts;
int rc;
rc = clock_gettime(CLOCK_MONOTONIC, &ts);
if (rc) {
ALOGE("clock_gettime(CLOCK_MONOTONIC) errno=%d", errno);
elapsed = 0;
} else {
// mMonotonicTs is updated only at first enable and resetStatistics
elapsed = (ts.tv_sec - mMonotonicTs.tv_sec) * 1000000000LL +
(ts.tv_nsec - mMonotonicTs.tv_nsec);
}
} else {
ALOGW("Can't compute elapsed time because measurements have never been enabled");
elapsed = 0;
}
return elapsed;
}
void ThreadCpuUsage::resetStatistics()
{
mStatistics.reset();
if (mMonotonicKnown) {
int rc;
rc = clock_gettime(CLOCK_MONOTONIC, &mMonotonicTs);
if (rc) {
ALOGE("clock_gettime(CLOCK_MONOTONIC) errno=%d", errno);
mMonotonicKnown = false;
}
}
}
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