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/*
* Copyright (C) 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 "FullGCActivityCallback.h"
#include "VM.h"
namespace JSC {
#if USE(CF) || USE(GLIB) || PLATFORM(QT)
#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
FullGCActivityCallback::FullGCActivityCallback(Heap* heap)
: GCActivityCallback(heap)
{
}
void FullGCActivityCallback::doCollection()
{
Heap& heap = m_vm->heap;
m_didSyncGCRecently = false;
#if !PLATFORM(IOS)
double startTime = WTF::monotonicallyIncreasingTime();
if (heap.isPagedOut(startTime + pagingTimeOut)) {
cancel();
heap.increaseLastFullGCLength(pagingTimeOut);
return;
}
#endif
heap.collect(FullCollection);
}
double FullGCActivityCallback::lastGCLength()
{
return m_vm->heap.lastFullGCLength();
}
double FullGCActivityCallback::deathRate()
{
Heap* heap = &m_vm->heap;
size_t sizeBefore = heap->sizeBeforeLastFullCollection();
size_t sizeAfter = heap->sizeAfterLastFullCollection();
if (!sizeBefore)
return 1.0;
if (sizeAfter > sizeBefore) {
// GC caused the heap to grow(!)
// This could happen if the we visited more extra memory than was reported allocated.
// We don't return a negative death rate, since that would schedule the next GC in the past.
return 0;
}
return static_cast<double>(sizeBefore - sizeAfter) / static_cast<double>(sizeBefore);
}
double FullGCActivityCallback::gcTimeSlice(size_t bytes)
{
return std::min((static_cast<double>(bytes) / MB) * Options::percentCPUPerMBForFullTimer(), Options::collectionTimerMaxPercentCPU());
}
#else
FullGCActivityCallback::FullGCActivityCallback(Heap* heap)
: GCActivityCallback(heap)
{
}
void FullGCActivityCallback::doCollection()
{
}
double FullGCActivityCallback::lastGCLength()
{
return 0;
}
double FullGCActivityCallback::deathRate()
{
return 0;
}
double FullGCActivityCallback::gcTimeSlice(size_t)
{
return 0;
}
#endif // USE(CF) || PLATFORM(EFL)
} // namespace JSC
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