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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/memory/memory_pressure_monitor.h"
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#include "base/logging.h"
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#include "base/metrics/histogram_macros.h"
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namespace base {
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namespace {
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MemoryPressureMonitor* g_monitor = nullptr;
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// Enumeration of UMA memory pressure levels. This needs to be kept in sync with
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// histograms.xml and the memory pressure levels defined in
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// MemoryPressureListener.
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enum MemoryPressureLevelUMA {
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UMA_MEMORY_PRESSURE_LEVEL_NONE = 0,
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UMA_MEMORY_PRESSURE_LEVEL_MODERATE = 1,
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UMA_MEMORY_PRESSURE_LEVEL_CRITICAL = 2,
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// This must be the last value in the enum.
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UMA_MEMORY_PRESSURE_LEVEL_COUNT,
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};
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// Converts a memory pressure level to an UMA enumeration value.
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MemoryPressureLevelUMA MemoryPressureLevelToUmaEnumValue(
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base::MemoryPressureListener::MemoryPressureLevel level) {
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switch (level) {
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case MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
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return UMA_MEMORY_PRESSURE_LEVEL_NONE;
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case MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
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return UMA_MEMORY_PRESSURE_LEVEL_MODERATE;
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case MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
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return UMA_MEMORY_PRESSURE_LEVEL_CRITICAL;
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}
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NOTREACHED();
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return UMA_MEMORY_PRESSURE_LEVEL_NONE;
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}
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} // namespace
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MemoryPressureMonitor::MemoryPressureMonitor() {
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DCHECK(!g_monitor);
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g_monitor = this;
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}
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MemoryPressureMonitor::~MemoryPressureMonitor() {
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DCHECK(g_monitor);
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g_monitor = nullptr;
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}
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// static
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MemoryPressureMonitor* MemoryPressureMonitor::Get() {
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return g_monitor;
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}
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void MemoryPressureMonitor::RecordMemoryPressure(
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base::MemoryPressureListener::MemoryPressureLevel level,
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int ticks) {
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// Use the more primitive STATIC_HISTOGRAM_POINTER_BLOCK macro because the
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// simple UMA_HISTOGRAM macros don't expose 'AddCount' functionality.
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STATIC_HISTOGRAM_POINTER_BLOCK(
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"Memory.PressureLevel",
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AddCount(MemoryPressureLevelToUmaEnumValue(level), ticks),
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base::LinearHistogram::FactoryGet(
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"Memory.PressureLevel", 1, UMA_MEMORY_PRESSURE_LEVEL_COUNT,
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UMA_MEMORY_PRESSURE_LEVEL_COUNT + 1,
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base::HistogramBase::kUmaTargetedHistogramFlag));
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}
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} // namespace base
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