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+// 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.
+
+#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
+// 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;
+ 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_