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author | Lorry Tar Creator <lorry-tar-importer@lorry> | 2016-04-10 09:28:39 +0000 |
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committer | Lorry Tar Creator <lorry-tar-importer@lorry> | 2016-04-10 09:28:39 +0000 |
commit | 32761a6cee1d0dee366b885b7b9c777e67885688 (patch) | |
tree | d6bec92bebfb216f4126356e55518842c2f476a1 /Source/JavaScriptCore/runtime/GCActivityCallback.cpp | |
parent | a4e969f4965059196ca948db781e52f7cfebf19e (diff) | |
download | WebKitGtk-tarball-32761a6cee1d0dee366b885b7b9c777e67885688.tar.gz |
webkitgtk-2.4.11webkitgtk-2.4.11
Diffstat (limited to 'Source/JavaScriptCore/runtime/GCActivityCallback.cpp')
-rw-r--r-- | Source/JavaScriptCore/runtime/GCActivityCallback.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/GCActivityCallback.cpp b/Source/JavaScriptCore/runtime/GCActivityCallback.cpp new file mode 100644 index 000000000..e1cc98867 --- /dev/null +++ b/Source/JavaScriptCore/runtime/GCActivityCallback.cpp @@ -0,0 +1,191 @@ +/* + * Copyright (C) 2010 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. + * 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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 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 "GCActivityCallback.h" + +#include "APIShims.h" +#include "Heap.h" +#include "VM.h" +#include "JSLock.h" +#include "JSObject.h" + +#include <wtf/RetainPtr.h> +#include <wtf/WTFThreadData.h> + +#if PLATFORM(EFL) +#include <wtf/MainThread.h> +#endif + +namespace JSC { + +bool GCActivityCallback::s_shouldCreateGCTimer = true; + +#if USE(CF) || PLATFORM(EFL) + +const double gcTimeSlicePerMB = 0.01; // Percentage of CPU time we will spend to reclaim 1 MB +const double maxGCTimeSlice = 0.05; // The maximum amount of CPU time we want to use for opportunistic timer-triggered collections. +const double timerSlop = 2.0; // Fudge factor to avoid performance cost of resetting timer. + +#if !PLATFORM(IOS) +const double pagingTimeOut = 0.1; // Time in seconds to allow opportunistic timer to iterate over all blocks to see if the Heap is paged out. +#endif + +#if !USE(CF) +const double hour = 60 * 60; +#endif + +#if USE(CF) +DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap) + : GCActivityCallback(heap->vm(), CFRunLoopGetCurrent()) + , m_delay(s_decade) +{ +} + +DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap, CFRunLoopRef runLoop) + : GCActivityCallback(heap->vm(), runLoop) + , m_delay(s_decade) +{ +} +#elif PLATFORM(EFL) +DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap) + : GCActivityCallback(heap->vm(), WTF::isMainThread()) + , m_delay(hour) +{ +} +#endif + +void DefaultGCActivityCallback::doWork() +{ + Heap* heap = &m_vm->heap; + if (!isEnabled()) + return; + + APIEntryShim shim(m_vm); +#if !PLATFORM(IOS) + double startTime = WTF::monotonicallyIncreasingTime(); + if (heap->isPagedOut(startTime + pagingTimeOut)) { + heap->activityCallback()->cancel(); + heap->increaseLastGCLength(pagingTimeOut); + return; + } +#endif + heap->collect(); +} + +#if USE(CF) +void DefaultGCActivityCallback::scheduleTimer(double newDelay) +{ + if (newDelay * timerSlop > m_delay) + return; + double delta = m_delay - newDelay; + m_delay = newDelay; + CFRunLoopTimerSetNextFireDate(m_timer.get(), CFRunLoopTimerGetNextFireDate(m_timer.get()) - delta); +} + +void DefaultGCActivityCallback::cancelTimer() +{ + m_delay = s_decade; + CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade); +} +#elif PLATFORM(EFL) +void DefaultGCActivityCallback::scheduleTimer(double newDelay) +{ + if (newDelay * timerSlop > m_delay) + return; + + stop(); + m_delay = newDelay; + + ASSERT(!m_timer); + m_timer = add(newDelay, this); +} + +void DefaultGCActivityCallback::cancelTimer() +{ + m_delay = hour; + stop(); +} +#endif + +void DefaultGCActivityCallback::didAllocate(size_t bytes) +{ +#if PLATFORM(EFL) + if (!isEnabled()) + return; + + ASSERT(WTF::isMainThread()); +#endif + + // The first byte allocated in an allocation cycle will report 0 bytes to didAllocate. + // We pretend it's one byte so that we don't ignore this allocation entirely. + if (!bytes) + bytes = 1; + Heap* heap = static_cast<Heap*>(&m_vm->heap); + double gcTimeSlice = std::min((static_cast<double>(bytes) / MB) * gcTimeSlicePerMB, maxGCTimeSlice); + double newDelay = heap->lastGCLength() / gcTimeSlice; + scheduleTimer(newDelay); +} + +void DefaultGCActivityCallback::willCollect() +{ + cancelTimer(); +} + +void DefaultGCActivityCallback::cancel() +{ + cancelTimer(); +} + +#else + +DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap) + : GCActivityCallback(heap->vm()) +{ +} + +void DefaultGCActivityCallback::doWork() +{ +} + +void DefaultGCActivityCallback::didAllocate(size_t) +{ +} + +void DefaultGCActivityCallback::willCollect() +{ +} + +void DefaultGCActivityCallback::cancel() +{ +} + +#endif + +} + |