ArcLowMemoryKillerMonitor:

chrome/browser/chromeos/arc/arc_low_memory_killer_monitor.h

Index: chrome/browser/chromeos/arc/arc_low_memory_killer_monitor.h
diff --git a/chrome/browser/chromeos/arc/arc_low_memory_killer_monitor.h b/chrome/browser/chromeos/arc/arc_low_memory_killer_monitor.h
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index 0000000000000000000000000000000000000000..773d7235e1bc73f3bf6991b66dfb8b076a58bda0
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+++ b/chrome/browser/chromeos/arc/arc_low_memory_killer_monitor.h
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+// 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_LOW_MEMORY_KILLER_MONITOR_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_ARC_LOW_MEMORY_KILLER_MONITOR_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.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 Chrome OS device, otherwise an lowmemorykiller event would
+// be reported twice since it reads in the entire kernel log from head.
+// On Chrome OS, it should live within a main browser thread.
+class ArcLowMemoryKillerMonitor {
+ public:
+  ArcLowMemoryKillerMonitor();
+  ~ArcLowMemoryKillerMonitor();
+
+  void Start();
+  void Stop();
+
+ private:
+  // Keep a reference to worker_pool_ in case |this| is deleted in
+  // shutdown process while this thread returns from a blocking read.
+  static void Run(scoped_refptr<base::SequencedWorkerPool> worker_pool);
+
+  scoped_refptr<base::SequencedWorkerPool> worker_pool_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcLowMemoryKillerMonitor);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_LOW_MEMORY_KILLER_MONITOR_H_"