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      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 }
     82