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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/bindings/core/v8/v8_gc_for_context_dispose.h"
#include "base/process/process_metrics.h"
#include "build/build_config.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/platform/bindings/v8_per_isolate_data.h"
#include "third_party/blink/renderer/platform/histogram.h"
#include "third_party/blink/renderer/platform/memory_coordinator.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread_scheduler.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
#include "v8/include/v8.h"
#if defined(OS_ANDROID)
static size_t GetMemoryUsage() {
size_t usage =
base::ProcessMetrics::CreateCurrentProcessMetrics()->GetMallocUsage() +
WTF::Partitions::TotalActiveBytes() +
blink::ProcessHeap::TotalAllocatedObjectSize() +
blink::ProcessHeap::TotalMarkedObjectSize();
v8::HeapStatistics v8_heap_statistics;
blink::V8PerIsolateData::MainThreadIsolate()->GetHeapStatistics(
&v8_heap_statistics);
usage = v8_heap_statistics.total_heap_size();
return usage;
}
#endif // defined(OS_ANDROID)
namespace blink {
V8GCForContextDispose::V8GCForContextDispose()
: pseudo_idle_timer_(
Platform::Current()->MainThread()->Scheduler()->V8TaskRunner(),
this,
&V8GCForContextDispose::PseudoIdleTimerFired) {
Reset();
}
void V8GCForContextDispose::NotifyContextDisposed(
bool is_main_frame,
WindowProxy::FrameReuseStatus frame_reuse_status) {
did_dispose_context_for_main_frame_ = is_main_frame;
last_context_disposal_time_ = WTF::CurrentTime();
#if defined(OS_ANDROID)
// When a low end device is in a low memory situation we should prioritize
// memory use and trigger a V8+Blink GC. However, on Android, if the frame
// will not be reused, the process will likely to be killed soon so skip this.
if (is_main_frame && frame_reuse_status == WindowProxy::kFrameWillBeReused &&
MemoryCoordinator::IsLowEndDevice() &&
MemoryCoordinator::IsCurrentlyLowMemory()) {
size_t pre_gc_memory_usage = GetMemoryUsage();
V8PerIsolateData::MainThreadIsolate()->MemoryPressureNotification(
v8::MemoryPressureLevel::kCritical);
size_t post_gc_memory_usage = GetMemoryUsage();
int reduction = static_cast<int>(pre_gc_memory_usage) -
static_cast<int>(post_gc_memory_usage);
DEFINE_STATIC_LOCAL(
CustomCountHistogram, reduction_histogram,
("BlinkGC.LowMemoryPageNavigationGC.Reduction", 1, 512, 50));
reduction_histogram.Count(reduction / 1024 / 1024);
}
#endif
V8PerIsolateData::MainThreadIsolate()->ContextDisposedNotification(
!is_main_frame);
pseudo_idle_timer_.Stop();
}
void V8GCForContextDispose::NotifyIdle() {
double max_time_since_last_context_disposal = .2;
if (!did_dispose_context_for_main_frame_ && !pseudo_idle_timer_.IsActive() &&
last_context_disposal_time_ + max_time_since_last_context_disposal >=
WTF::CurrentTime()) {
pseudo_idle_timer_.StartOneShot(TimeDelta(), FROM_HERE);
}
}
V8GCForContextDispose& V8GCForContextDispose::Instance() {
DEFINE_STATIC_LOCAL(V8GCForContextDispose, static_instance, ());
return static_instance;
}
void V8GCForContextDispose::PseudoIdleTimerFired(TimerBase*) {
V8PerIsolateData::MainThreadIsolate()->IdleNotificationDeadline(
CurrentTimeTicksInSeconds());
Reset();
}
void V8GCForContextDispose::Reset() {
did_dispose_context_for_main_frame_ = false;
last_context_disposal_time_ = -1;
}
} // namespace blink
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