Add a histogram for renderer memory usage.

content/renderer/renderer_main.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/debug/stack_trace.h"
 #include "base/debug/trace_event.h"
 #include "base/hi_res_timer_manager.h"
@@ skipping 12 matching lines @@
 #include "base/time.h"
 #include "content/common/pepper_plugin_registry.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/renderer/browser_plugin/browser_plugin_manager_impl.h"
 #include "content/renderer/render_process_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/renderer_main_platform_delegate.h"
 #include "ui/base/ui_base_switches.h"
+#include "webkit/glue/webkit_glue.h"
 #include "webkit/plugins/ppapi/ppapi_interface_factory.h"
 
 #if defined(OS_MACOSX)
 #include <Carbon/Carbon.h>
 #include <signal.h>
 #include <unistd.h>
 
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
@@ skipping 34 matching lines @@
     if (!begin_process_message_.is_null())
       process_times_->AddTime(base::TimeTicks::Now() - begin_process_message_);
   }
 
  private:
   base::TimeTicks begin_process_message_;
   base::Histogram* const process_times_;
   DISALLOW_COPY_AND_ASSIGN(RendererMessageLoopObserver);
 };
 
+// For measuring memory usage after each task. Behind a command line flag.
+class MemoryObserver : public MessageLoop::TaskObserver {
+ public:
+  MemoryObserver() {}
+
+  virtual void WillProcessTask(base::TimeTicks time_posted) OVERRIDE {}
+
+  virtual void DidProcessTask(base::TimeTicks time_posted) OVERRIDE {
+    HISTOGRAM_MEMORY_KB("Memory.RendererUsed", webkit_glue::MemoryUsageKB());
+  }
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
+};
+
 // mainline routine for running as the Renderer process
 int RendererMain(const MainFunctionParams& parameters) {
   TRACE_EVENT_BEGIN_ETW("RendererMain", 0, "");
 
   const CommandLine& parsed_command_line = parameters.command_line;
 
 #if defined(OS_MACOSX)
   base::mac::ScopedNSAutoreleasePool* pool = parameters.autorelease_pool;
 #endif  // OS_MACOSX
 
@@ skipping 31 matching lines @@
   // now; see http://crbug.com/13890 for info) we need to have a UI loop.
   MessageLoop main_message_loop(MessageLoop::TYPE_UI);
 #else
   // The main message loop of the renderer services doesn't have IO or UI tasks,
   // unless in-process-plugins is used.
   MessageLoop main_message_loop(RenderProcessImpl::InProcessPlugins() ?
               MessageLoop::TYPE_UI : MessageLoop::TYPE_DEFAULT);
 #endif
   main_message_loop.AddTaskObserver(&task_observer);
 
+  scoped_ptr<MemoryObserver> memory_observer;
+  if (parsed_command_line.HasSwitch(switches::kMemoryMetrics)) {
+    memory_observer.reset(new MemoryObserver());
+    main_message_loop.AddTaskObserver(memory_observer.get());
+  }
+
   base::PlatformThread::SetName("CrRendererMain");
 
   base::SystemMonitor system_monitor;
   HighResolutionTimerManager hi_res_timer_manager;
 
   platform.PlatformInitialize();
 
   bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox);
   platform.InitSandboxTests(no_sandbox);
 
@@ skipping 54 matching lines @@
       MessageLoop::current()->Run();
       TRACE_EVENT_END_ETW("RendererMain.START_MSG_LOOP", 0, 0);
     }
   }
   platform.PlatformUninitialize();
   TRACE_EVENT_END_ETW("RendererMain", 0, "");
   return 0;
 }
 
 }  // namespace content