Performance monitor stats gathering.

chrome/browser/performance_monitor/performance_monitor.h

Index: chrome/browser/performance_monitor/performance_monitor.h
diff --git a/chrome/browser/performance_monitor/performance_monitor.h b/chrome/browser/performance_monitor/performance_monitor.h
index 3a900813981989c2b9ab352d7c0db51ab2c35d96..227595d326838577ca313b6b8be0571c2174091e 100644
--- a/chrome/browser/performance_monitor/performance_monitor.h
+++ b/chrome/browser/performance_monitor/performance_monitor.h
@@ -6,10 +6,15 @@
 #define CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
 #pragma once
 
+#include <map>
+#include <string>
+
 #include "base/callback.h"
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
+#include "base/process.h"
+#include "base/process_util.h"
 #include "chrome/browser/performance_monitor/database.h"
 #include "chrome/browser/performance_monitor/event.h"
 #include "content/public/browser/notification_details.h"
@@ -24,6 +29,9 @@ class PerformanceMonitor : public content::NotificationObserver {
  public:
   typedef base::Callback<void(const std::string&)> StateValueCallback;
 
+  typedef std::map<base::ProcessId,
+                   linked_ptr<base::ProcessMetrics> > MetricsMap;
+
   // Set the path which the PerformanceMonitor should use for the database files
   // constructed. This must be done prior to the initialization of the
   // PerformanceMonitor. Returns true on success, false on failure (failure
@@ -43,6 +51,19 @@ class PerformanceMonitor : public content::NotificationObserver {
   // it has been updated. If it has, insert an event in the database.
   void CheckForVersionUpdate();
 
+  // Gathers CPU usage and memory usage of all Chrome processes.
+  void GatherStatistics();
+
+  // Gathers the CPU usage of every process that has been running since the
+  // last call to GatherStatistics().

[Devlin, 2012/07/11 16:28:08]

Make the helpers private?

[mitchellwrosen, 2012/07/11 18:30:18]

Done.

+  void GatherCPUUsage();
+
+  // Gathers the memory usage of every process in the current list of processes.
+  void GatherMemoryUsage();
+
+  // Updates the ProcessMetrics map with the current list of processes.
+  void UpdateMetricsMap();
+
   // content::NotificationObserver
   // Wait for various notifications; insert events into the database upon
   // occurance.
@@ -81,6 +102,14 @@ class PerformanceMonitor : public content::NotificationObserver {
 
   void AddEventOnBackgroundThread(scoped_ptr<Event> event);
 
+  // Wrapper function for inserting metrics into the database.
+  void AddMetric(const std::string& key, const std::string& value);
+
+  void AddMetricOnBackgroundThread(const std::string& key,
+                                   const std::string& value);
+
+  MetricsMap metrics_map_;
+
   // The location at which the database files are stored; if empty, the database
   // will default to '<user_data_dir>/performance_monitor_dbs'.
   FilePath database_path_;