This adds periodic OOM score adjustment, based on the last access time

chrome/browser/browser_main.cc

 // Copyright (c) 2010 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 "chrome/browser/browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 87 matching lines @@
 #include "base/linux_util.h"
 #include "chrome/app/breakpad_linux.h"
 #endif
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 #include "chrome/browser/gtk/gtk_util.h"
 #endif
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/boot_times_loader.h"
+#include "chrome/browser/oom_priority_manager.h"
 #endif
 
 // TODO(port): several win-only methods have been pulled out of this, but
 // BrowserMain() as a whole needs to be broken apart so that it's usable by
 // other platforms. For now, it's just a stub. This is a serious work in
 // progress and should not be taken as an indication of a real refactoring.
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <commctrl.h>
@@ skipping 1276 matching lines @@
     // See issue 40144.
     profile->GetExtensionsService()->InitEventRouters();
   }
 
 #if defined(OS_WIN)
   // We check this here because if the profile is OTR (chromeos possibility)
   // it won't still be accessible after browser is destroyed.
   bool record_search_engine = is_first_run && !profile->IsOffTheRecord();
 #endif
 
-    // ChildProcess:: is a misnomer unless you consider context.  Use
-    // of --wait-for-debugger only makes sense when Chrome itself is a
-    // child process (e.g. when launched by PyAuto).
+  // ChildProcess:: is a misnomer unless you consider context.  Use
+  // of --wait-for-debugger only makes sense when Chrome itself is a
+  // child process (e.g. when launched by PyAuto).
   if (parsed_command_line.HasSwitch(switches::kWaitForDebugger)) {
     ChildProcess::WaitForDebugger(L"Browser");
   }
 
   // If remoting or cloud print proxy is enabled and setup has been completed
   // we start the service process here.
   // The prerequisite for running the service process is that we have IO, UI
   // and PROCESS_LAUNCHER threads up and running.
   // TODO(hclam): Need to check for cloud print proxy too.
   if (parsed_command_line.HasSwitch(switches::kEnableRemoting)) {
     if (user_prefs->GetBoolean(prefs::kRemotingHasSetupCompleted)) {
       ServiceProcessControl* control = ServiceProcessControlManager::instance()
           ->GetProcessControl(profile, kServiceProcessRemoting);
        control->Launch(NULL);
     }
   }
 
+#if defined(OS_CHROMEOS)
+  // Run the Out of Memory priority manager while in this scope.  Wait
+  // until here to start so that we give the most amount of time for
+  // the other services to start up before we start adjusting the oom
+  // priority.  In reality, it doesn't matter much where in this scope
+  // this is started, but it must be started in this scope so it will
+  // also be terminated when this scope exits.
+  scoped_ptr<browser::OomPriorityManager> oom_priority_manager(
+      new browser::OomPriorityManager);
+#endif
+
   int result_code = ResultCodes::NORMAL_EXIT;
   if (parameters.ui_task) {
     // We are in test mode. Run one task and enter the main message loop.
     if (pool)
       pool->Recycle();
     parameters.ui_task->Run();
     delete parameters.ui_task;
   } else {
     // We are in regular browser boot sequence. Open initial stabs and enter
     // the main message loop.
@@ skipping 71 matching lines @@
   metrics->Stop();
 
   // browser_shutdown takes care of deleting browser_process, so we need to
   // release it.
   ignore_result(browser_process.release());
   browser_shutdown::Shutdown();
 
   TRACE_EVENT_END("BrowserMain", 0, 0);
   return result_code;
 }