[Webkit-unassigned] [Bug 186728] New: StructureTransitionTable wastes 318KB of HashTable capacity on cnn.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186728

            Bug ID: 186728
           Summary: StructureTransitionTable wastes 318KB 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: 318816 bytes (used 143904 of 462720 bytes, utilization: 31.10%) - 689 allocations
1   0x116681ba5 WTF::HashTable<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, WTF::KeyValuePair<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, JSC::Weak<JSC::Structure> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, JSC::Weak<JSC::Structure> > >, JSC::StructureTransitionTable::Hash, WTF::HashMap<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, JSC::Weak<JSC::Structure>, JSC::StructureTransitionTable::Hash, WTF::HashTraits<std::__1::pair<WTF::UniquedStringImpl*, unsigned int> >, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::KeyValuePairTraits, WTF::HashTraits<std::__1::pair<WTF::UniquedStringImpl*, unsigned int> > >::HashTable()
2   0x116681b85 WTF::HashMap<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, JSC::Weak<JSC::Structure>, JSC::StructureTransitionTable::Hash, WTF::HashTraits<std::__1::pair<WTF::UniquedStringImpl*, unsigned int> >, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::HashMap()
3   0x116681ae5 WTF::HashMap<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, JSC::Weak<JSC::Structure>, JSC::StructureTransitionTable::Hash, WTF::HashTraits<std::__1::pair<WTF::UniquedStringImpl*, unsigned int> >, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::HashMap()
4   0x116681a9b JSC::WeakGCMap<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, JSC::Structure, JSC::StructureTransitionTable::Hash, WTF::HashTraits<std::__1::pair<WTF::UniquedStringImpl*, unsigned int> > >::WeakGCMap(JSC::VM&)
5   0x1166706fd JSC::WeakGCMap<std::__1::pair<WTF::UniquedStringImpl*, unsigned int>, JSC::Structure, JSC::StructureTransitionTable::Hash, WTF::HashTraits<std::__1::pair<WTF::UniquedStringImpl*, unsigned int> > >::WeakGCMap(JSC::VM&)
6   0x116670392 JSC::StructureTransitionTable::add(JSC::VM&, JSC::Structure*)
7   0x11667357f JSC::Structure::addNewPropertyTransition(JSC::VM&, JSC::Structure*, JSC::PropertyName, unsigned int, int&, JSC::PutPropertySlot::Context, JSC::DeferredStructureTransitionWatchpointFire*)
8   0x11536ad9c bool JSC::JSObject::putDirectInternal<(JSC::JSObject::PutMode)1>(JSC::VM&, JSC::PropertyName, JSC::JSValue, unsigned int, JSC::PutPropertySlot&)

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