[Webkit-unassigned] [Bug 186733] ensurePropertyReplacementWatchpointSet wastes 308KB of HashTable capacity on cnn.com

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Jun 16 12:33:47 PDT 2018


https://bugs.webkit.org/show_bug.cgi?id=186733

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Also:

Wasted capacity: 67888 bytes (used 18000 of 85888 bytes, utilization: 20.96%) - 551 allocations
1   0x116684e05 WTF::HashTable<int, WTF::KeyValuePair<int, WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> > >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<int, WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> > > >, WTF::IntHash<int>, WTF::HashMap<int, WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> >, WTF::IntHash<int>, WTF::UnsignedWithZeroKeyHashTraits<int>, WTF::HashTraits<WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> > > >::KeyValuePairTraits, WTF::UnsignedWithZeroKeyHashTraits<int> >::HashTable()
2   0x116684de5 WTF::HashMap<int, WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> >, WTF::IntHash<int>, WTF::UnsignedWithZeroKeyHashTraits<int>, WTF::HashTraits<WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> > > >::HashMap()
3   0x116684dc5 WTF::HashMap<int, WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> >, WTF::IntHash<int>, WTF::UnsignedWithZeroKeyHashTraits<int>, WTF::HashTraits<WTF::RefPtr<JSC::WatchpointSet, WTF::DumbPtrTraits<JSC::WatchpointSet> > > >::HashMap()
4   0x1166754f2 JSC::Structure::ensurePropertyReplacementWatchpointSet(JSC::VM&, int)
5   0x1156e0cb3 JSC::Structure::startWatchingPropertyForReplacements(JSC::VM&, int)
6   0x11624959d JSC::tryCacheGetByID(JSC::ExecState*, JSC::JSValue, JSC::Identifier const&, JSC::PropertySlot const&, JSC::StructureStubInfo&, JSC::GetByIDKind)
7   0x116247627 JSC::repatchGetByID(JSC::ExecState*, JSC::JSValue, JSC::Identifier const&, JSC::PropertySlot const&, JSC::StructureStubInfo&, JSC::GetByIDKind)
8   0x116226f97 operationGetByIdOptimize::$_1::operator()(bool, JSC::PropertySlot&) const

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