commit | 4cc720436197cbbb8e4c48226df34e98d98509ab | [log] [tgz] |
---|---|---|
author | ysuzuki@apple.com <ysuzuki@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> | Sat Nov 09 01:37:55 2019 +0000 |
committer | ysuzuki@apple.com <ysuzuki@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> | Sat Nov 09 01:37:55 2019 +0000 |
tree | 9b44e3365f4d359fd8de771550e1b9a6730027d2 | |
parent | 52b7bf5ed79012977948456de78fa60819deaf7e [diff] |
[JSC] Make IsoSubspace scalable https://bugs.webkit.org/show_bug.cgi?id=201908 Reviewed by Keith Miller. This patch introduces lower-tier into IsoSubspace so that we can avoid allocating MarkedBlock if a certain type of object is not allocated so many. This optimization allows us apply IsoSubspace more aggressively to various types of objects without introducing memory regression even if such a type of object is allocated so frequently. We use LargeAllocation for these lower-tier objects. Each IsoSubspace holds up to 8 lower-tier objects allocated via LargeAllocation. We use this special LargeAllocation when we tend to allocate small # of cells for this type. Specifically, what we are doing right now is, (1) first, try to allocate in an existing MarkedBlock (there won't be one to start), and (2) then, try to allocate in LargeAllocation, and if we cannot allocate lower-tier objects, (3) finally we allocate a new MarkedBlock. Once this LargeAllocation is allocated to a certain type, we do not deallocate it until VM is destroyed, so that we can keep IsoSubspace's characteristics: once an address is assigned to a certain type, we continue using this address only for this type. To introduce this optimization, we need to remove an restriction that no callee cells can be a LargeAllocation. This also turns out that SamplingProfiler's isValueGCObject is heavily relies on that all the callee is small-sized. isValueGCObject relies on the thing that MarkedSpace::m_largeAllocations is sorted. But this is not true since this vector is sorted only when conservative scan happens. And further, this vector is only partially sorted: we sort only an eden part part of this vector. So we cannot use this vector to implement isValueGCObject in the sampling profiler. Instead we register HeapCell address into a hash-set in MarkedSpace. Since we do not need to find a pointer that is pointing at the middle of the JSCell in sampling profiler, just registering cell address is enough. And we maintain this hash-set only when sampling profiler is enabled to save memory in major cases. We also fix the code that is relying on that JSString is always allocated in MarkedBlock. And we also fix PackedCellPtr's assumption that CodeBlock is always allocated in MarkedBlock. We also make sizeof(LargeAllocation) small since it is now used for non-large allocations. JetStream2 and Speedometer2 are neutral. RAMification shows 0.6% progression on iOS devices. * heap/BlockDirectory.cpp: (JSC::BlockDirectory::BlockDirectory): * heap/BlockDirectory.h: * heap/BlockDirectoryInlines.h: (JSC::BlockDirectory::tryAllocateFromLowerTier): * heap/CompleteSubspace.cpp: (JSC::CompleteSubspace::allocatorForSlow): (JSC::CompleteSubspace::tryAllocateSlow): (JSC::CompleteSubspace::reallocateLargeAllocationNonVirtual): * heap/Heap.cpp: (JSC::Heap::dumpHeapStatisticsAtVMDestruction): (JSC::Heap::addCoreConstraints): * heap/HeapUtil.h: (JSC::HeapUtil::isPointerGCObjectJSCell): (JSC::HeapUtil::isValueGCObject): * heap/IsoAlignedMemoryAllocator.cpp: (JSC::IsoAlignedMemoryAllocator::tryAllocateMemory): (JSC::IsoAlignedMemoryAllocator::freeMemory): (JSC::IsoAlignedMemoryAllocator::tryReallocateMemory): * heap/IsoCellSet.cpp: (JSC::IsoCellSet::~IsoCellSet): * heap/IsoCellSet.h: * heap/IsoCellSetInlines.h: (JSC::IsoCellSet::add): (JSC::IsoCellSet::remove): (JSC::IsoCellSet::contains const): (JSC::IsoCellSet::forEachMarkedCell): (JSC::IsoCellSet::forEachMarkedCellInParallel): (JSC::IsoCellSet::forEachLiveCell): (JSC::IsoCellSet::sweepLowerTierCell): * heap/IsoSubspace.cpp: (JSC::IsoSubspace::IsoSubspace): (JSC::IsoSubspace::tryAllocateFromLowerTier): (JSC::IsoSubspace::sweepLowerTierCell): * heap/IsoSubspace.h: * heap/LargeAllocation.cpp: (JSC::LargeAllocation::tryReallocate): (JSC::LargeAllocation::createForLowerTier): (JSC::LargeAllocation::reuseForLowerTier): (JSC::LargeAllocation::LargeAllocation): * heap/LargeAllocation.h: (JSC::LargeAllocation::lowerTierIndex const): (JSC::LargeAllocation::isLowerTier const): * heap/LocalAllocator.cpp: (JSC::LocalAllocator::allocateSlowCase): * heap/MarkedBlock.cpp: (JSC::MarkedBlock::Handle::Handle): (JSC::MarkedBlock::Handle::stopAllocating): * heap/MarkedBlock.h: (JSC::MarkedBlock::Handle::forEachCell): * heap/MarkedSpace.cpp: (JSC::MarkedSpace::freeMemory): (JSC::MarkedSpace::lastChanceToFinalize): (JSC::MarkedSpace::sweepLargeAllocations): (JSC::MarkedSpace::enableLargeAllocationTracking): * heap/MarkedSpace.h: (JSC::MarkedSpace:: const): * heap/PackedCellPtr.h: (JSC::PackedCellPtr::PackedCellPtr): * heap/Subspace.h: * heap/WeakSet.cpp: (JSC::WeakSet::~WeakSet): (JSC::WeakSet::findAllocator): (JSC::WeakSet::addAllocator): * heap/WeakSet.h: (JSC::WeakSet::WeakSet): (JSC::WeakSet::resetAllocator): (JSC::WeakSet::container const): Deleted. (JSC::WeakSet::setContainer): Deleted. * heap/WeakSetInlines.h: (JSC::WeakSet::allocate): * runtime/InternalFunction.cpp: (JSC::InternalFunction::InternalFunction): * runtime/JSCallee.cpp: (JSC::JSCallee::JSCallee): * runtime/JSString.h: * runtime/SamplingProfiler.cpp: (JSC::SamplingProfiler::SamplingProfiler): (JSC::SamplingProfiler::processUnverifiedStackTraces): (JSC::SamplingProfiler::releaseStackTraces): (JSC::SamplingProfiler::stackTracesAsJSON): (JSC::SamplingProfiler::reportTopFunctions): (JSC::SamplingProfiler::reportTopBytecodes): * runtime/SamplingProfiler.h: git-svn-id: http://svn.webkit.org/repository/webkit/trunk@252298 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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