chrome/browser/mac/mac_startup_profiler.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/mac/mac_startup_profiler.h"
   6
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9 #include "components/startup_metric_utils/startup_metric_utils.h"
  10
  11 // static
  12 MacStartupProfiler* MacStartupProfiler::GetInstance() {
  13   return Singleton<MacStartupProfiler>::get();
  14 }
  15
  16 MacStartupProfiler::MacStartupProfiler() : recorded_metrics_(false) {
  17 }
  18
  19 MacStartupProfiler::~MacStartupProfiler() {
  20 }
  21
  22 void MacStartupProfiler::Profile(Location location) {
  23   profiled_times_[location] = base::Time::Now();
  24 }
  25
  26 void MacStartupProfiler::RecordMetrics() {
  27   const base::Time* main_entry_time =
  28       startup_metric_utils::MainEntryPointTime();
  29   DCHECK(main_entry_time);
  30   DCHECK(!recorded_metrics_);
  31
  32   recorded_metrics_ = true;
  33
  34   for (std::map<Location, base::Time>::const_iterator it =
  35            profiled_times_.begin();
  36        it != profiled_times_.end();
  37        ++it) {
  38     const base::Time& location_time = it->second;
  39     base::TimeDelta delta = location_time - *main_entry_time;
  40     RecordHistogram(it->first, delta);
  41   }
  42 }
  43
  44 const std::string MacStartupProfiler::HistogramName(Location location) {
  45   std::string prefix("Startup.OSX.");
  46   switch (location) {
  47     case PRE_MAIN_MESSAGE_LOOP_START:
  48       return prefix + "PreMainMessageLoopStart";
  49     case AWAKE_FROM_NIB:
  50       return prefix + "AwakeFromNib";
  51     case POST_MAIN_MESSAGE_LOOP_START:
  52       return prefix + "PostMainMessageLoopStart";
  53     case PRE_PROFILE_INIT:
  54       return prefix + "PreProfileInit";
  55     case POST_PROFILE_INIT:
  56       return prefix + "PostProfileInit";
  57     case WILL_FINISH_LAUNCHING:
  58       return prefix + "WillFinishLaunching";
  59     case DID_FINISH_LAUNCHING:
  60       return prefix + "DockIconWillFinishBouncing";
  61   }
  62 }
  63
  64 void MacStartupProfiler::RecordHistogram(Location location,
  65                                          const base::TimeDelta& delta) {
  66   const std::string name(HistogramName(location));
  67   base::TimeDelta min = base::TimeDelta::FromMilliseconds(10);
  68   base::TimeDelta max = base::TimeDelta::FromMinutes(1);
  69   int bucket_count = 100;
  70
  71   // No need to cache the histogram pointers, since each invocation of this
  72   // method will be the first and only usage of a histogram with that given
  73   // name.
  74   base::HistogramBase* histogram = base::Histogram::FactoryTimeGet(
  75       name,
  76       min,
  77       max,
  78       bucket_count,
  79       base::HistogramBase::kUmaTargetedHistogramFlag);
  80   histogram->AddTime(delta);
  81 }