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/*
* Copyright (C) 2011, 2014 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "config.h"
#include "MemoryRelease.h"
#include "CSSFontSelector.h"
#include "CSSValuePool.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "CommonVM.h"
#include "Document.h"
#include "FontCache.h"
#include "GCController.h"
#include "HTMLMediaElement.h"
#include "InlineStyleSheetOwner.h"
#include "InspectorInstrumentation.h"
#include "Logging.h"
#include "MainFrame.h"
#include "MemoryCache.h"
#include "Page.h"
#include "PageCache.h"
#include "RenderTheme.h"
#include "ScrollingThread.h"
#include "StyleScope.h"
#include "StyledElement.h"
#include "WorkerThread.h"
#include <wtf/FastMalloc.h>
#include <wtf/SystemTracing.h>
#if PLATFORM(COCOA)
#include "ResourceUsageThread.h"
#endif
namespace WebCore {
static void releaseNoncriticalMemory()
{
RenderTheme::singleton().purgeCaches();
FontCache::singleton().purgeInactiveFontData();
FontDescription::invalidateCaches();
clearWidthCaches();
for (auto* document : Document::allDocuments())
document->clearSelectorQueryCache();
MemoryCache::singleton().pruneDeadResourcesToSize(0);
InlineStyleSheetOwner::clearCache();
}
static void releaseCriticalMemory(Synchronous synchronous)
{
// Right now, the only reason we call release critical memory while not under memory pressure is if the process is about to be suspended.
PruningReason pruningReason = MemoryPressureHandler::singleton().isUnderMemoryPressure() ? PruningReason::MemoryPressure : PruningReason::ProcessSuspended;
PageCache::singleton().pruneToSizeNow(0, pruningReason);
MemoryCache::singleton().pruneLiveResourcesToSize(0, /*shouldDestroyDecodedDataForAllLiveResources*/ true);
CSSValuePool::singleton().drain();
Vector<RefPtr<Document>> documents;
copyToVector(Document::allDocuments(), documents);
for (auto& document : documents) {
document->styleScope().clearResolver();
document->fontSelector().emptyCaches();
}
GCController::singleton().deleteAllCode(JSC::DeleteAllCodeIfNotCollecting);
#if ENABLE(VIDEO)
for (auto* mediaElement : HTMLMediaElement::allMediaElements()) {
if (mediaElement->paused())
mediaElement->purgeBufferedDataIfPossible();
}
#endif
if (synchronous == Synchronous::Yes) {
GCController::singleton().garbageCollectNow();
} else {
#if PLATFORM(IOS)
GCController::singleton().garbageCollectNowIfNotDoneRecently();
#else
GCController::singleton().garbageCollectSoon();
#endif
}
}
void releaseMemory(Critical critical, Synchronous synchronous)
{
TraceScope scope(MemoryPressureHandlerStart, MemoryPressureHandlerEnd, static_cast<uint64_t>(critical), static_cast<uint64_t>(synchronous));
if (critical == Critical::Yes) {
// Return unused pages back to the OS now as this will likely give us a little memory to work with.
WTF::releaseFastMallocFreeMemory();
releaseCriticalMemory(synchronous);
}
releaseNoncriticalMemory();
platformReleaseMemory(critical);
if (synchronous == Synchronous::Yes) {
// FastMalloc has lock-free thread specific caches that can only be cleared from the thread itself.
WorkerThread::releaseFastMallocFreeMemoryInAllThreads();
#if ENABLE(ASYNC_SCROLLING) && !PLATFORM(IOS)
ScrollingThread::dispatch(WTF::releaseFastMallocFreeMemory);
#endif
WTF::releaseFastMallocFreeMemory();
}
#if ENABLE(RESOURCE_USAGE)
Page::forEachPage([&](Page& page) {
InspectorInstrumentation::didHandleMemoryPressure(page, critical);
});
#endif
}
#if !RELEASE_LOG_DISABLED
static unsigned pageCount()
{
unsigned count = 0;
Page::forEachPage([&] (Page& page) {
if (!page.isUtilityPage())
++count;
});
return count;
}
#endif
void logMemoryStatisticsAtTimeOfDeath()
{
#if !RELEASE_LOG_DISABLED
#if PLATFORM(COCOA)
auto pageSize = vmPageSize();
auto pages = pagesPerVMTag();
RELEASE_LOG(MemoryPressure, "Dirty memory per VM tag at time of death:");
for (unsigned i = 0; i < 256; ++i) {
size_t dirty = pages[i].dirty * pageSize;
if (!dirty)
continue;
String tagName = displayNameForVMTag(i);
if (!tagName)
tagName = String::format("Tag %u", i);
RELEASE_LOG(MemoryPressure, "%16s: %lu MB", tagName.latin1().data(), dirty / MB);
}
#endif
auto& vm = commonVM();
RELEASE_LOG(MemoryPressure, "Memory usage statistics at time of death:");
RELEASE_LOG(MemoryPressure, "GC heap size: %zu", vm.heap.size());
RELEASE_LOG(MemoryPressure, "GC heap extra memory size: %zu", vm.heap.extraMemorySize());
#if ENABLE(RESOURCE_USAGE)
RELEASE_LOG(MemoryPressure, "GC heap external memory: %zu", vm.heap.externalMemorySize());
#endif
RELEASE_LOG(MemoryPressure, "Global object count: %zu", vm.heap.globalObjectCount());
RELEASE_LOG(MemoryPressure, "Page count: %u", pageCount());
RELEASE_LOG(MemoryPressure, "Document count: %u", Document::allDocuments().size());
RELEASE_LOG(MemoryPressure, "Live JavaScript objects:");
for (auto& it : *vm.heap.objectTypeCounts())
RELEASE_LOG(MemoryPressure, " %s: %d", it.key, it.value);
#endif
}
#if !PLATFORM(COCOA)
void platformReleaseMemory(Critical) { }
void jettisonExpensiveObjectsOnTopLevelNavigation() { }
void registerMemoryReleaseNotifyCallbacks() { }
#endif
} // namespace WebCore
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