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/*
* Copyright (C) 2014-2017 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 <wtf/MemoryPressureHandler.h>
#include "VM.h"
namespace JSC {
FullGCActivityCallback::FullGCActivityCallback(JSC::Heap& heap, Synchronousness synchronousness)
: GCActivityCallback(heap, synchronousness)
{
}
FullGCActivityCallback::~FullGCActivityCallback() = default;
void FullGCActivityCallback::doCollection(VM& vm)
{
JSC::Heap& heap = vm.heap;
setDidGCRecently(false);
#if !PLATFORM(IOS_FAMILY) || PLATFORM(MACCATALYST)
MonotonicTime startTime = MonotonicTime::now();
if (MemoryPressureHandler::singleton().isUnderMemoryPressure() && heap.isPagedOut()) {
cancel();
heap.increaseLastFullGCLength(MonotonicTime::now() - startTime);
return;
}
#endif
heap.collect(m_synchronousness, CollectionScope::Full);
}
Seconds FullGCActivityCallback::lastGCLength(JSC::Heap& heap)
{
return heap.lastFullGCLength();
}
double FullGCActivityCallback::deathRate(JSC::Heap& 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());
}
} // namespace JSC
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