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Bug 717698. Add about:jank infrastructure. r=ehsan

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Adds a profiling mode that only records samples when we
haven't spun the event loop
This commit is contained in:
Jeff Muizelaar 2011-12-20 15:13:52 -05:00
parent bdec86a061
commit 53360cb95c
1 changed files with 25 additions and 9 deletions
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34
tools/profiler/sps/TableTicker.cpp
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@ -245,6 +245,7 @@ class TableTicker: public Sampler {
{
mUseStackWalk = hasFeature(aFeatures, aFeatureCount, "stackwalk");
mProfile.addTag(ProfileEntry('m', "Start"));
mJankOnly = hasFeature(aFeatures, aFeatureCount, "jank");
}
~TableTicker() { if (IsActive()) Stop(); }
@ -276,6 +277,7 @@ class TableTicker: public Sampler {
Stack *mStack;
bool mSaveRequested;
bool mUseStackWalk;
bool mJankOnly;
};
/**
@ -380,17 +382,31 @@ void TableTicker::Tick(TickSample* sample)
}
mStack->mQueueClearMarker = true;
#ifdef USE_BACKTRACE
if (mUseStackWalk) {
doBacktrace(mProfile);
} else {
doSampleStackTrace(mStack, mProfile, sample);
bool recordSample = true;
if (mJankOnly) {
recordSample = false;
// only record the events when we have a we haven't seen a tracer event for 100ms
if (!sLastTracerEvent.IsNull()) {
TimeDuration delta = sample->timestamp - sLastTracerEvent;
if (delta.ToMilliseconds() > 100.0) {
recordSample = true;
}
}
}
#else
doSampleStackTrace(mStack, mProfile, sample);
#endif
if (!sLastTracerEvent.IsNull() && sample) {
if (recordSample) {
#ifdef USE_BACKTRACE
if (mUseStackWalk) {
doBacktrace(mProfile);
} else {
doSampleStackTrace(mStack, mProfile, sample);
}
#else
doSampleStackTrace(mStack, mProfile, sample);
#endif
}
if (!mJankOnly && !sLastTracerEvent.IsNull() && sample) {
TimeDuration delta = sample->timestamp - sLastTracerEvent;
mProfile.addTag(ProfileEntry('r', delta.ToMilliseconds()));
}