[Webkit-unassigned] [Bug 186736] New: JITThunks wastes 106KB of HashTable capacity on cnn.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186736

            Bug ID: 186736
           Summary: JITThunks wastes 106KB 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: 106528 bytes (used 24544 of 131072 bytes, utilization: 18.73%) - 1 allocations
1   0x11623be95 WTF::HashTable<std::__1::tuple<JSC::TaggedNativeFunction, JSC::TaggedNativeFunction, WTF::String>, WTF::KeyValuePair<std::__1::tuple<JSC::TaggedNativeFunction, JSC::TaggedNativeFunction, WTF::String>, JSC::Weak<JSC::NativeExecutable> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<std::__1::tuple<JSC::TaggedNativeFunction, JSC::TaggedNativeFunction, WTF::String>, JSC::Weak<JSC::NativeExecutable> > >, JSC::JITThunks::HostFunctionHash, WTF::HashMap<std::__1::tuple<JSC::TaggedNativeFunction, JSC::TaggedNativeFunction, WTF::String>, JSC::Weak<JSC::NativeExecutable>, JSC::JITThunks::HostFunctionHash, JSC::JITThunks::HostFunctionHashTrait, WTF::HashTraits<JSC::Weak<JSC::NativeExecutable> > >::KeyValuePairTraits, JSC::JITThunks::HostFunctionHashTrait>::HashTable()
2   0x11623be75 WTF::HashMap<std::__1::tuple<JSC::TaggedNativeFunction, JSC::TaggedNativeFunction, WTF::String>, JSC::Weak<JSC::NativeExecutable>, JSC::JITThunks::HostFunctionHash, JSC::JITThunks::HostFunctionHashTrait, WTF::HashTraits<JSC::Weak<JSC::NativeExecutable> > >::HashMap()
3   0x11623be55 WTF::HashMap<std::__1::tuple<JSC::TaggedNativeFunction, JSC::TaggedNativeFunction, WTF::String>, JSC::Weak<JSC::NativeExecutable>, JSC::JITThunks::HostFunctionHash, JSC::JITThunks::HostFunctionHashTrait, WTF::HashTraits<JSC::Weak<JSC::NativeExecutable> > >::HashMap()
4   0x116233661 JSC::JITThunks::JITThunks()
5   0x116233725 JSC::JITThunks::JITThunks()
6   0x1166be558 JSC::VM::VM(JSC::VM::VMType, JSC::HeapType)
7   0x1166c1d51 JSC::VM::VM(JSC::VM::VMType, JSC::HeapType)
8   0x1166c5406 JSC::VM::create(JSC::HeapType)

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