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// Copyright 2013 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 "content/browser/renderer_host/renderer_frame_manager.h"
#include <algorithm>
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/memory_pressure_monitor.h"
#include "base/memory/shared_memory.h"
#include "base/sys_info.h"
#include "build/build_config.h"
#include "content/common/host_shared_bitmap_manager.h"
namespace content {
namespace {
const int kModeratePressurePercentage = 50;
const int kCriticalPressurePercentage = 10;
} // namespace
RendererFrameManager* RendererFrameManager::GetInstance() {
return base::Singleton<RendererFrameManager>::get();
}
void RendererFrameManager::AddFrame(RendererFrameManagerClient* frame,
bool locked) {
RemoveFrame(frame);
if (locked)
locked_frames_[frame] = 1;
else
unlocked_frames_.push_front(frame);
CullUnlockedFrames(GetMaxNumberOfSavedFrames());
}
void RendererFrameManager::RemoveFrame(RendererFrameManagerClient* frame) {
std::map<RendererFrameManagerClient*, size_t>::iterator locked_iter =
locked_frames_.find(frame);
if (locked_iter != locked_frames_.end())
locked_frames_.erase(locked_iter);
unlocked_frames_.remove(frame);
}
void RendererFrameManager::LockFrame(RendererFrameManagerClient* frame) {
std::list<RendererFrameManagerClient*>::iterator unlocked_iter =
std::find(unlocked_frames_.begin(), unlocked_frames_.end(), frame);
if (unlocked_iter != unlocked_frames_.end()) {
DCHECK(locked_frames_.find(frame) == locked_frames_.end());
unlocked_frames_.remove(frame);
locked_frames_[frame] = 1;
} else {
DCHECK(locked_frames_.find(frame) != locked_frames_.end());
locked_frames_[frame]++;
}
}
void RendererFrameManager::UnlockFrame(RendererFrameManagerClient* frame) {
DCHECK(locked_frames_.find(frame) != locked_frames_.end());
size_t locked_count = locked_frames_[frame];
DCHECK(locked_count);
if (locked_count > 1) {
locked_frames_[frame]--;
} else {
RemoveFrame(frame);
unlocked_frames_.push_front(frame);
CullUnlockedFrames(GetMaxNumberOfSavedFrames());
}
}
size_t RendererFrameManager::GetMaxNumberOfSavedFrames() const {
base::MemoryPressureMonitor* monitor = base::MemoryPressureMonitor::Get();
if (!monitor)
return max_number_of_saved_frames_;
// Until we have a global OnMemoryPressureChanged event we need to query the
// value from our specific pressure monitor.
int percentage = 100;
switch (monitor->GetCurrentPressureLevel()) {
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
percentage = 100;
break;
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
percentage = kModeratePressurePercentage;
break;
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
percentage = kCriticalPressurePercentage;
break;
}
size_t frames = (max_number_of_saved_frames_ * percentage) / 100;
return std::max(static_cast<size_t>(1), frames);
}
RendererFrameManager::RendererFrameManager()
: memory_pressure_listener_(
base::Bind(&RendererFrameManager::OnMemoryPressure,
base::Unretained(this))) {
// Note: With the destruction of this class the |memory_pressure_listener_|
// gets destroyed and the observer will remove itself.
max_number_of_saved_frames_ =
#if defined(OS_ANDROID)
1;
#else
std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256));
#endif
max_handles_ = base::SharedMemory::GetHandleLimit() / 8.0f;
}
RendererFrameManager::~RendererFrameManager() {}
void RendererFrameManager::CullUnlockedFrames(size_t saved_frame_limit) {
if (unlocked_frames_.size() + locked_frames_.size() > 0) {
float handles_per_frame =
HostSharedBitmapManager::current()->AllocatedBitmapCount() * 1.0f /
(unlocked_frames_.size() + locked_frames_.size());
saved_frame_limit = std::max(
1,
static_cast<int>(std::min(static_cast<float>(saved_frame_limit),
max_handles_ / handles_per_frame)));
}
while (!unlocked_frames_.empty() &&
unlocked_frames_.size() + locked_frames_.size() > saved_frame_limit) {
size_t old_size = unlocked_frames_.size();
// Should remove self from list.
unlocked_frames_.back()->EvictCurrentFrame();
DCHECK_EQ(unlocked_frames_.size() + 1, old_size);
}
}
void RendererFrameManager::OnMemoryPressure(
base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
int saved_frame_limit = max_number_of_saved_frames_;
if (saved_frame_limit <= 1)
return;
int percentage = 100;
switch (memory_pressure_level) {
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
percentage = kModeratePressurePercentage;
break;
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
percentage = kCriticalPressurePercentage;
break;
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
// No need to change anything when there is no pressure.
return;
}
CullUnlockedFrames(std::max(1, (saved_frame_limit * percentage) / 100));
}
} // namespace content
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