gecko-dev/dom/media/Tracing.cpp
2019-10-02 12:16:22 +00:00

103 lines
3.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "Tracing.h"
#include <inttypes.h>
#include "mozilla/TimeStamp.h"
using namespace mozilla;
mozilla::AsyncLogger gAudioCallbackTraceLogger("AudioCallbackTracing");
static Atomic<bool> gTracingStarted(false);
void StartAudioCallbackTracing() {
#ifdef TRACING
if (gTracingStarted) {
return;
}
// This is a noop if the logger has not been enabled.
gAudioCallbackTraceLogger.Start();
gAudioCallbackTraceLogger.Log("[");
gTracingStarted = true;
#endif
}
uint64_t AutoTracer::NowInUs() {
static TimeStamp base = TimeStamp::Now();
return (TimeStamp::Now() - base).ToMicroseconds();
}
void AutoTracer::PrintEvent(const char* aName, const char* aCategory,
const char* aComment, TracingPhase aPhase,
uint64_t aTime, uint64_t aPID, uint64_t aThread) {
mLogger.Log(
"{\"name\": \"%s\", \"cat\": \"%s\", \"ph\": \"%c\","
"\"ts\": %" PRIu64 ", \"pid\": %" PRIu64
", \"tid\":"
" %" PRIu64 ", \"args\": { \"comment\": \"%s\"}},",
aName, aCategory, TRACING_PHASE_STRINGS[static_cast<int>(aPhase)], aTime,
aPID, aThread, aComment);
}
void AutoTracer::PrintBudget(const char* aName, const char* aCategory,
uint64_t aDuration, uint64_t aPID,
uint64_t aThread, uint64_t aFrames,
uint64_t aSampleRate) {
mLogger.Log(
"{\"name\": \"%s\", \"cat\": \"%s\", \"ph\": \"X\","
"\"ts\": %" PRIu64 ", \"dur\": %" PRIu64 ", \"pid\": %" PRIu64
","
"\"tid\": %" PRIu64 ", \"args\": { \"comment\": \"%" PRIu64 "/%" PRIu64
"\"}},",
aName, aCategory, NowInUs(), aDuration, aPID, aThread, aFrames,
aSampleRate);
}
AutoTracer::AutoTracer(AsyncLogger& aLogger, const char* aLocation,
uint64_t aPID, uint64_t aTID, EventType aEventType,
uint64_t aFrames, uint64_t aSampleRate)
: mLogger(aLogger),
mLocation(aLocation),
mComment(nullptr),
mEventType(aEventType),
mPID(aPID),
mTID(aTID) {
MOZ_ASSERT(aEventType == EventType::BUDGET);
if (aLogger.Enabled()) {
float durationUS = (static_cast<float>(aFrames) / aSampleRate) * 1e6;
PrintBudget(aLocation, "perf", durationUS, mPID, mTID, aFrames,
aSampleRate);
}
}
AutoTracer::AutoTracer(AsyncLogger& aLogger, const char* aLocation,
uint64_t aPID, uint64_t aTID, EventType aEventType,
const char* aComment)
: mLogger(aLogger),
mLocation(aLocation),
mComment(aComment),
mEventType(aEventType),
mPID(aPID),
mTID(aTID) {
MOZ_ASSERT(aEventType == EventType::DURATION);
if (aLogger.Enabled()) {
PrintEvent(aLocation, "perf", mComment, TracingPhase::BEGIN, NowInUs(),
aPID, aTID);
}
}
AutoTracer::~AutoTracer() {
if (mEventType == EventType::DURATION) {
if (mLogger.Enabled()) {
PrintEvent(mLocation, "perf", mComment, TracingPhase::END, NowInUs(),
mPID, mTID);
}
}
}