chrome/browser/stack_sampling_configuration.cc

   1 // Copyright 2015 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/stack_sampling_configuration.h"
   6
   7 #include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
   8 #include "chrome/common/channel_info.h"
   9 #include "components/version_info/version_info.h"
  10
  11 namespace {
  12
  13 bool IsProfilerEnabledForCurrentChannel() {
  14   const version_info::Channel channel = chrome::GetChannel();
  15   return (channel == version_info::Channel::UNKNOWN ||
  16           channel == version_info::Channel::CANARY ||
  17           channel == version_info::Channel::DEV);
  18 }
  19
  20 }  // namespace
  21
  22 StackSamplingConfiguration::StackSamplingConfiguration()
  23     // Disabled pending fixes for deadlock scenarios. https://crbug.com/528129.
  24     : configuration_(PROFILE_DISABLED) {
  25 }
  26
  27 base::StackSamplingProfiler::SamplingParams
  28 StackSamplingConfiguration::GetSamplingParams() const {
  29   base::StackSamplingProfiler::SamplingParams params;
  30   params.bursts = 1;
  31   const base::TimeDelta duration = base::TimeDelta::FromSeconds(30);
  32
  33   switch (configuration_) {
  34     case PROFILE_DISABLED:
  35       params.initial_delay = base::TimeDelta::FromMilliseconds(0);
  36       params.sampling_interval = base::TimeDelta::FromMilliseconds(0);
  37       params.samples_per_burst = 0;
  38       break;
  39
  40     case PROFILE_NO_SAMPLES:
  41       params.initial_delay = duration;
  42       params.sampling_interval = base::TimeDelta::FromMilliseconds(0);
  43       params.samples_per_burst = 0;
  44       break;
  45
  46     case PROFILE_5HZ:
  47       params.initial_delay = base::TimeDelta::FromMilliseconds(0);
  48       params.sampling_interval = base::TimeDelta::FromMilliseconds(200);
  49       params.samples_per_burst = duration / params.sampling_interval;
  50       break;
  51
  52     case PROFILE_10HZ:
  53       params.initial_delay = base::TimeDelta::FromMilliseconds(0);
  54       params.sampling_interval = base::TimeDelta::FromMilliseconds(100);
  55       params.samples_per_burst = duration / params.sampling_interval;
  56       break;
  57
  58     case PROFILE_100HZ:
  59       params.initial_delay = base::TimeDelta::FromMilliseconds(0);
  60       params.sampling_interval = base::TimeDelta::FromMilliseconds(10);
  61       params.samples_per_burst = duration / params.sampling_interval;
  62       break;
  63   }
  64   return params;
  65 }
  66
  67 bool StackSamplingConfiguration::IsProfilerEnabled() const {
  68   return IsProfilerEnabledForCurrentChannel() &&
  69       configuration_ != PROFILE_DISABLED;
  70 }
  71
  72 void StackSamplingConfiguration::RegisterSyntheticFieldTrial() const {
  73   if (!IsProfilerEnabledForCurrentChannel())
  74     return;
  75
  76   std::string group;
  77   switch (configuration_) {
  78     case PROFILE_DISABLED:
  79       group = "Disabled";
  80       break;
  81
  82     case PROFILE_NO_SAMPLES:
  83       group = "NoSamples";
  84       break;
  85
  86     case PROFILE_5HZ:
  87       group = "5Hz";
  88       break;
  89
  90     case PROFILE_10HZ:
  91       group = "10Hz";
  92       break;
  93
  94     case PROFILE_100HZ:
  95       group = "100Hz";
  96       break;
  97   }
  98
  99   ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
 100       "SyntheticStackProfilingConfiguration",
 101       group);
 102 }