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 = startup_metric_utils::MainEntryPointTime();
  28   DCHECK(!main_entry_time.is_null());
  29   DCHECK(!recorded_metrics_);
  30
  31   recorded_metrics_ = true;
  32
  33   for (std::map<Location, base::Time>::const_iterator it =
  34            profiled_times_.begin();
  35        it != profiled_times_.end();
  36        ++it) {
  37     const base::Time& location_time = it->second;
  38     base::TimeDelta delta = location_time - main_entry_time;
  39     RecordHistogram(it->first, delta);
  40   }
  41 }
  42
  43 const std::string MacStartupProfiler::HistogramName(Location location) {
  44   std::string prefix("Startup.OSX.");
  45   switch (location) {
  46     case PRE_MAIN_MESSAGE_LOOP_START:
  47       return prefix + "PreMainMessageLoopStart";
  48     case AWAKE_FROM_NIB:
  49       return prefix + "AwakeFromNib";
  50     case POST_MAIN_MESSAGE_LOOP_START:
  51       return prefix + "PostMainMessageLoopStart";
  52     case PRE_PROFILE_INIT:
  53       return prefix + "PreProfileInit";
  54     case POST_PROFILE_INIT:
  55       return prefix + "PostProfileInit";
  56     case WILL_FINISH_LAUNCHING:
  57       return prefix + "WillFinishLaunching";
  58     case DID_FINISH_LAUNCHING:
  59       return prefix + "DockIconWillFinishBouncing";
  60   }
  61 }
  62
  63 void MacStartupProfiler::RecordHistogram(Location location,
  64                                          const base::TimeDelta& delta) {
  65   const std::string name(HistogramName(location));
  66   base::TimeDelta min = base::TimeDelta::FromMilliseconds(10);
  67   base::TimeDelta max = base::TimeDelta::FromMinutes(1);
  68   int bucket_count = 100;
  69
  70   // No need to cache the histogram pointers, since each invocation of this
  71   // method will be the first and only usage of a histogram with that given
  72   // name.
  73   base::HistogramBase* histogram = base::Histogram::FactoryTimeGet(
  74       name,
  75       min,
  76       max,
  77       bucket_count,
  78       base::HistogramBase::kUmaTargetedHistogramFlag);
  79   histogram->AddTime(delta);
  80 }