Changing OOM range to 0, 1000 and tweaking OOM algorithm.

chrome/browser/oom_priority_manager.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_OOM_PRIORITY_MANAGER_H_
 #define CHROME_BROWSER_OOM_PRIORITY_MANAGER_H_
 
 #include <list>
 
 #include "base/timer.h"
 #include "base/process.h"
 
 namespace browser {
 
 // The OomPriorityManager periodically checks (see
 // ADJUSTMENT_INTERVAL_SECONDS in the source) the status of renderers
 // and adjusts the out of memory (OOM) adjustment value (in
-// /proc/<pid>/oom_adj) of the renderers so that they match the
+// /proc/<pid>/oom_score_adj) of the renderers so that they match the
 // algorithm embedded here for priority in being killed upon OOM
 // conditions.
 //
 // The algorithm used favors killing tabs that are not pinned, have
 // been idle for longest, and take up the most memory, in that order
 // of priority.  We round the idle times to the nearest few minutes
 // (see BUCKET_INTERVAL_MINUTES in the source) so that we can bucket
 // them, as no two tabs will have exactly the same idle time.
 class OomPriorityManager {
  public:
   OomPriorityManager();
   ~OomPriorityManager();
 
  private:
   struct RendererStats {
     bool is_pinned;
+    bool is_selected;
     base::TimeTicks last_selected;
     size_t memory_used;
     base::ProcessHandle renderer_handle;
   };
   typedef std::list<RendererStats> StatsList;
 
   void StartTimer();
   void StopTimer();
 
   // Posts DoAdjustOomPriorities task to the file thread.  Called when
   // the timer fires.
   void AdjustOomPriorities();
 
   // Called by AdjustOomPriorities.  Runs on the file thread.
   void DoAdjustOomPriorities(StatsList list);
 
   static bool CompareRendererStats(RendererStats first, RendererStats second);
 
   base::RepeatingTimer<OomPriorityManager> timer_;
 
   DISALLOW_COPY_AND_ASSIGN(OomPriorityManager);
 };
 }  // namespace browser
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(browser::OomPriorityManager);
 
 #endif  // CHROME_BROWSER_OOM_PRIORITY_MANAGER_H_