| /* |
| * 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 "JSGlobalData.h" |
| #include "JSLock.h" |
| #include "JSObject.h" |
| |
| #include <wtf/RetainPtr.h> |
| #include <wtf/WTFThreadData.h> |
| |
| namespace JSC { |
| |
| #if USE(CF) |
| |
| 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 CFTimeInterval hour = 60 * 60; |
| |
| DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap) |
| : GCActivityCallback(heap->globalData(), CFRunLoopGetCurrent()) |
| , m_delay(s_decade) |
| { |
| } |
| |
| DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap, CFRunLoopRef runLoop) |
| : GCActivityCallback(heap->globalData(), runLoop) |
| , m_delay(s_decade) |
| { |
| } |
| |
| void DefaultGCActivityCallback::doWork() |
| { |
| Heap* heap = &m_globalData->heap; |
| if (!isEnabled()) |
| return; |
| |
| APIEntryShim shim(m_globalData); |
| #if !PLATFORM(IOS) |
| double startTime = WTF::monotonicallyIncreasingTime(); |
| if (heap->isPagedOut(startTime + pagingTimeOut)) { |
| heap->activityCallback()->cancel(); |
| heap->increaseLastGCLength(pagingTimeOut); |
| return; |
| } |
| #endif |
| heap->collect(Heap::DoNotSweep); |
| } |
| |
| 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); |
| } |
| |
| void DefaultGCActivityCallback::didAllocate(size_t bytes) |
| { |
| // 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_globalData->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->globalData()) |
| { |
| } |
| |
| void DefaultGCActivityCallback::doWork() |
| { |
| } |
| |
| void DefaultGCActivityCallback::didAllocate(size_t) |
| { |
| } |
| |
| void DefaultGCActivityCallback::willCollect() |
| { |
| } |
| |
| void DefaultGCActivityCallback::cancel() |
| { |
| } |
| |
| #endif |
| |
| } |
| |