src/chrome/browser/performance_monitor/process_metrics_history.cc

   1 // Copyright 2013 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 <limits>
   6
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/process/process_metrics.h"
  10
  11 #include "chrome/browser/performance_monitor/constants.h"
  12 #include "chrome/browser/performance_monitor/process_metrics_history.h"
  13 #if defined(OS_MACOSX)
  14 #include "content/public/browser/browser_child_process_host.h"
  15 #endif
  16 #include "content/public/common/process_type.h"
  17
  18 namespace performance_monitor {
  19
  20 ProcessMetricsHistory::ProcessMetricsHistory()
  21     : process_handle_(0),
  22       process_type_(content::PROCESS_TYPE_UNKNOWN),
  23       last_update_sequence_(0) {
  24   ResetCounters();
  25 }
  26
  27 ProcessMetricsHistory::~ProcessMetricsHistory() {}
  28
  29 void ProcessMetricsHistory::ResetCounters() {
  30   min_cpu_usage_ = std::numeric_limits<double>::max();
  31   accumulated_cpu_usage_ = 0.0;
  32   accumulated_private_bytes_ = 0;
  33   accumulated_shared_bytes_ = 0;
  34   sample_count_ = 0;
  35 }
  36
  37 void ProcessMetricsHistory::Initialize(base::ProcessHandle process_handle,
  38                                        int process_type,
  39                                        int initial_update_sequence) {
  40   DCHECK(process_handle_ == 0);
  41   process_handle_ = process_handle;
  42   process_type_ = process_type;
  43   last_update_sequence_ = initial_update_sequence;
  44
  45 #if defined(OS_MACOSX)
  46   process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(
  47       process_handle_, content::BrowserChildProcessHost::GetPortProvider()));
  48 #else
  49   process_metrics_.reset(
  50       base::ProcessMetrics::CreateProcessMetrics(process_handle_));
  51 #endif
  52 }
  53
  54 void ProcessMetricsHistory::SampleMetrics() {
  55   double cpu_usage = process_metrics_->GetPlatformIndependentCPUUsage();
  56   min_cpu_usage_ = std::min(min_cpu_usage_, cpu_usage);
  57   accumulated_cpu_usage_ += cpu_usage;
  58
  59   size_t private_bytes = 0;
  60   size_t shared_bytes = 0;
  61   if (!process_metrics_->GetMemoryBytes(&private_bytes, &shared_bytes))
  62     LOG(WARNING) << "GetMemoryBytes returned NULL (platform-specific error)";
  63
  64   accumulated_private_bytes_ += private_bytes;
  65   accumulated_shared_bytes_ += shared_bytes;
  66
  67   sample_count_++;
  68 }
  69
  70 void ProcessMetricsHistory::EndOfCycle() {
  71   RunPerformanceTriggers();
  72   ResetCounters();
  73 }
  74
  75 void ProcessMetricsHistory::RunPerformanceTriggers() {
  76   // As an initial step, we only care about browser processes.
  77   if (process_type_ != content::PROCESS_TYPE_BROWSER || sample_count_ == 0)
  78     return;
  79
  80   // We scale up to the equivalent of 64 CPU cores fully loaded. More than this
  81   // doesn't really matter, as we're already in a terrible place.
  82   UMA_HISTOGRAM_CUSTOM_COUNTS("PerformanceMonitor.AverageCPU.BrowserProcess",
  83                               accumulated_cpu_usage_ / sample_count_,
  84                               0, 6400, 50);
  85
  86   // If CPU usage has consistently been above our threshold,
  87   // we *may* have an issue.
  88   if (min_cpu_usage_ > kHighCPUUtilizationThreshold)
  89     UMA_HISTOGRAM_BOOLEAN("PerformanceMonitor.HighCPU.BrowserProcess", true);
  90 }
  91
  92 }  // namespace performance_monitor