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Unified Diff: base/memory/memory_pressure_monitor_chromeos.h

Issue 1250093006: Added memory pressure monitor for linux. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Uncomment ::Get functionality Created 5 years, 5 months ago
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Index: base/memory/memory_pressure_monitor_chromeos.h
diff --git a/base/memory/memory_pressure_monitor_chromeos.h b/base/memory/memory_pressure_monitor_chromeos.h
deleted file mode 100644
index ff8992a56314ae33b29bac7dc4c40c20f6af42b6..0000000000000000000000000000000000000000
--- a/base/memory/memory_pressure_monitor_chromeos.h
+++ /dev/null
@@ -1,119 +0,0 @@
-// Copyright 2014 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 BASE_MEMORY_MEMORY_PRESSURE_MONITOR_CHROMEOS_H_
-#define BASE_MEMORY_MEMORY_PRESSURE_MONITOR_CHROMEOS_H_
-
-#include "base/base_export.h"
-#include "base/files/scoped_file.h"
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "base/memory/memory_pressure_listener.h"
-#include "base/memory/memory_pressure_monitor.h"
-#include "base/memory/weak_ptr.h"
-#include "base/timer/timer.h"
-
-namespace base {
-namespace chromeos {
-
-class TestMemoryPressureMonitor;
-
-////////////////////////////////////////////////////////////////////////////////
-// MemoryPressureMonitor
-//
-// A class to handle the observation of our free memory. It notifies the
-// MemoryPressureListener of memory fill level changes, so that it can take
-// action to reduce memory resources accordingly.
-//
-class BASE_EXPORT MemoryPressureMonitor : public base::MemoryPressureMonitor {
- public:
- using GetUsedMemoryInPercentCallback = int (*)();
-
- // There are two memory pressure events:
- // MODERATE - which will mainly release caches.
- // CRITICAL - which will discard tabs.
- // The |MemoryPressureThresholds| enum selects the strategy of firing these
- // events: A conservative strategy will keep as much content in memory as
- // possible (causing the system to swap to zram) and an aggressive strategy
- // will release memory earlier to avoid swapping.
- enum MemoryPressureThresholds {
- // Use the system default.
- THRESHOLD_DEFAULT = 0,
- // Try to keep as much content in memory as possible.
- THRESHOLD_CONSERVATIVE = 1,
- // Discard caches earlier, allowing to keep more tabs in memory.
- THRESHOLD_AGGRESSIVE_CACHE_DISCARD = 2,
- // Discard tabs earlier, allowing the system to get faster.
- THRESHOLD_AGGRESSIVE_TAB_DISCARD = 3,
- // Discard caches and tabs earlier to allow the system to be faster.
- THRESHOLD_AGGRESSIVE = 4
- };
-
- explicit MemoryPressureMonitor(MemoryPressureThresholds thresholds);
- ~MemoryPressureMonitor() override;
-
- // Redo the memory pressure calculation soon and call again if a critical
- // memory pressure prevails. Note that this call will trigger an asynchronous
- // action which gives the system time to release memory back into the pool.
- void ScheduleEarlyCheck();
-
- // Get the current memory pressure level.
- MemoryPressureListener::MemoryPressureLevel GetCurrentPressureLevel() const
- override;
-
- // Returns a type-casted version of the current memory pressure monitor. A
- // simple wrapper to base::MemoryPressureMonitor::Get.
- static MemoryPressureMonitor* Get();
-
- private:
- friend TestMemoryPressureMonitor;
- // Starts observing the memory fill level.
- // Calls to StartObserving should always be matched with calls to
- // StopObserving.
- void StartObserving();
-
- // Stop observing the memory fill level.
- // May be safely called if StartObserving has not been called.
- void StopObserving();
-
- // The function which gets periodically called to check any changes in the
- // memory pressure. It will report pressure changes as well as continuous
- // critical pressure levels.
- void CheckMemoryPressure();
-
- // The function periodically checks the memory pressure changes and records
- // the UMA histogram statistics for the current memory pressure level.
- void CheckMemoryPressureAndRecordStatistics();
-
- // Get the memory pressure in percent (virtual for testing).
- virtual int GetUsedMemoryInPercent();
-
- // The current memory pressure.
- base::MemoryPressureListener::MemoryPressureLevel
- current_memory_pressure_level_;
-
- // A periodic timer to check for resource pressure changes. This will get
- // replaced by a kernel triggered event system (see crbug.com/381196).
- base::RepeatingTimer<MemoryPressureMonitor> timer_;
-
- // To slow down the amount of moderate pressure event calls, this counter
- // gets used to count the number of events since the last event occured.
- int moderate_pressure_repeat_count_;
-
- // The thresholds for moderate and critical pressure.
- const int moderate_pressure_threshold_percent_;
- const int critical_pressure_threshold_percent_;
-
- // File descriptor used to detect low memory condition.
- ScopedFD low_mem_file_;
-
- base::WeakPtrFactory<MemoryPressureMonitor> weak_ptr_factory_;
-
- DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
-};
-
-} // namespace chromeos
-} // namespace base
-
-#endif // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_CHROMEOS_H_
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