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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_
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