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