[Webkit-unassigned] [Bug 186732] New: JITStubRoutineSet wastes 180KB of HashTable capacity on can.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186732

            Bug ID: 186732
           Summary: JITStubRoutineSet wastes 180KB of HashTable capacity
                    on can.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: 179008 bytes (used 83136 of 262144 bytes, utilization: 31.71%) - 1 allocations
1   0x11606c2a5 WTF::HashTable<unsigned long, WTF::KeyValuePair<unsigned long, JSC::GCAwareJITStubRoutine*>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<unsigned long, JSC::GCAwareJITStubRoutine*> >, WTF::IntHash<unsigned long>, WTF::HashMap<unsigned long, JSC::GCAwareJITStubRoutine*, WTF::IntHash<unsigned long>, WTF::HashTraits<unsigned long>, WTF::HashTraits<JSC::GCAwareJITStubRoutine*> >::KeyValuePairTraits, WTF::HashTraits<unsigned long> >::HashTable()
2   0x11606c285 WTF::HashMap<unsigned long, JSC::GCAwareJITStubRoutine*, WTF::IntHash<unsigned long>, WTF::HashTraits<unsigned long>, WTF::HashTraits<JSC::GCAwareJITStubRoutine*> >::HashMap()
3   0x116062b75 WTF::HashMap<unsigned long, JSC::GCAwareJITStubRoutine*, WTF::IntHash<unsigned long>, WTF::HashTraits<unsigned long>, WTF::HashTraits<JSC::GCAwareJITStubRoutine*> >::HashMap()
4   0x116062b49 JSC::JITStubRoutineSet::JITStubRoutineSet()
5   0x116062bb5 JSC::JITStubRoutineSet::JITStubRoutineSet()
6   0x116010051 JSC::Heap::Heap(JSC::VM*, JSC::HeapType)
7   0x1160126b3 JSC::Heap::Heap(JSC::VM*, JSC::HeapType)
8   0x1166b8e72 JSC::VM::VM(JSC::VM::VMType, JSC::HeapType)

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