dom/media/Tracing.cpp
author Mike Hommey <mh+mozilla@glandium.org>
Fri, 11 Jan 2019 16:01:15 +0000
changeset 453570 daf50f25895db073e44d50fecf2e4f6fe873865d
parent 446960 0ceae9db9ec0be18daa1a279511ad305723185d4
permissions -rw-r--r--
Bug 1519307 - Add a new project to build useful parts of breakpad independently. r=froydnj With `ac_add_options --enable-project=tools/crashreporter` in a mozconfig, `./mach build` builds minidump_stackwalk, dump_syms and fileid. One caveat is that due to limitation in how the build system works currently, it's cumbersome to keep dump_syms as a host program for Gecko, and to make it a target program for this project. For now, keep it as a host program. We're not going to use it on automation, but it's still convenient to have for quick local builds (I've had to resort to awful hacks downstream). Differential Revision: https://phabricator.services.mozilla.com/D16299

/* -*- 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;

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);
    }
  }
}