+++ /dev/null
-/*
- * 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 {
-
-#if USE(CF) || PLATFORM(QT) || PLATFORM(EFL)
-
-#if PLATFORM(IOS)
- bool GCActivityCallback::s_shouldCreateGCTimer = true;
-#endif // PLATFORM(IOS)
-
-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.
-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.
-const double hour = 60 * 60;
-
-#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(QT)
-DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
- : GCActivityCallback(heap->vm())
- , m_delay(hour)
-{
-}
-#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(Heap::DoNotSweep);
-}
-
-#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(QT)
-
-void DefaultGCActivityCallback::scheduleTimer(double newDelay)
-{
- if (newDelay * timerSlop > m_delay)
- return;
- m_delay = newDelay;
- m_timer.start(newDelay * 1000, this);
-}
-
-void DefaultGCActivityCallback::cancelTimer()
-{
- m_delay = hour;
- m_timer.stop();
-}
-#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
-
-}
-
projects / apple / javascriptcore.git / blobdiff