ArcLowMemoryKillerMonitor:

chrome/browser/chromeos/arc/arc_lowmemorykiller_monitor.h

+// Copyright 2016 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_CHROMEOS_ARC_ARC_LOWMEMORYKILLER_MONITOR_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_ARC_LOWMEMORYKILLER_MONITOR_H_
+
+#include "base/threading/sequenced_worker_pool.h"
+
+namespace arc {
+
+// Trace lowmemorykiller events and report to UMA.
+//
+// If kernel lowmemorykiller is enabled, it would kill processes automatically
+// on memory pressure. ArcLowMemoryKillerMonitor listens on lowmemorykiller log
+// from kernel space and reports to UMA.
+//
+// Note: There should be only one ArcLowMemoryKillerMonitor instance during the
+// power cycle of a ChromeOS device, otherwise an lowmemorykiller event would be

[Yusuke Sato, 2016/03/12 00:24:29]

Chrome OS (here and elsewhere)

[cylee1, 2016/03/14 13:03:35]

Done.

+// reported twice since it reads in the entire kernel log from head.
+// On ChromeOS, it should live within a main browser thread.
+class ArcLowMemoryKillerMonitor {
+ public:
+  ArcLowMemoryKillerMonitor();
+  ~ArcLowMemoryKillerMonitor();
+
+  void Start();
+  void Stop();
+
+ private:
+  void Run();
+
+  scoped_refptr<base::SequencedWorkerPool> worker_pool_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcLowMemoryKillerMonitor);

[Yusuke Sato, 2016/03/12 00:24:29]

#include base/macros.h is needed for DISALLOW_COPY_AND_ASSIGN (although
sequenced_worker_pool.h does that too as of today.)

[cylee1, 2016/03/14 13:03:35]

Done.

+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_LOWMEMORYKILLER_MONITOR_H_"