[Webkit-unassigned] [Bug 186733] New: ensurePropertyReplacementWatchpointSet wastes 168KB of HashTable capacity on cnn.com

[bugzilla-daemon at webkit.org]

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

            Bug ID: 186733
           Summary: ensurePropertyReplacementWatchpointSet wastes 168KB of
                    HashTable capacity on cnn.com
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Using tooling from bug 186698, loading can and running "notifyutil -p com.apple.WebKit.dumpHashTableCapacity" shows:

Wasted capacity: 168032 bytes (used 34720 of 202752 bytes, utilization: 17.12%) - 1441 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   0x1157cf3af JSC::PropertyCondition::isWatchableWhenValid(JSC::Structure*, JSC::PropertyCondition::WatchabilityEffort) const
6   0x1157cf510 JSC::PropertyCondition::isWatchable(JSC::Structure*, JSC::JSObject*, JSC::PropertyCondition::WatchabilityEffort) const
7   0x1157bdca0 JSC::ObjectPropertyCondition::isWatchable(JSC::Structure*, JSC::PropertyCondition::WatchabilityEffort) const
8   0x1157bb17b JSC::ObjectPropertyCondition::isWatchable(JSC::PropertyCondition::WatchabilityEffort) const

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