[Webkit-unassigned] [Bug 186702] CodeBlock's SegmentedVector wastes 58KB of Vector capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186702

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
On nytimes.com:

Wasted capacity: 125336 bytes (used 16456 of 141792 bytes, utilization: 11.61%) - 1434 allocations
1   0x115829225 WTF::VectorBuffer<WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::Segment*, 0ul>::VectorBuffer()
2   0x115829205 WTF::Vector<WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::Segment*, 0ul, WTF::CrashOnOverflow, 16ul>::Vector()
3   0x1158291e5 WTF::Vector<WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::Segment*, 0ul, WTF::CrashOnOverflow, 16ul>::Vector()
4   0x1158291c0 WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::SegmentedVector()
5   0x11580fc45 WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::SegmentedVector()
6   0x1158113aa JSC::CodeBlock::CodeBlock(JSC::VM*, JSC::Structure*, JSC::ScriptExecutable*, JSC::UnlinkedCodeBlock*, JSC::JSScope*, WTF::RefPtr<JSC::SourceProvider, WTF::DumbPtrTraits<JSC::SourceProvider> >&&, unsigned int, unsigned int)
7   0x1167404fb JSC::FunctionCodeBlock::FunctionCodeBlock(JSC::VM*, JSC::Structure*, JSC::FunctionExecutable*, JSC::UnlinkedFunctionCodeBlock*, JSC::JSScope*, WTF::RefPtr<JSC::SourceProvider, WTF::DumbPtrTraits<JSC::SourceProvider> >&&, unsigned int, unsigned int)
8   0x116740292 JSC::FunctionCodeBlock::FunctionCodeBlock(JSC::VM*, JSC::Structure*, JSC::FunctionExecutable*, JSC::UnlinkedFunctionCodeBlock*, JSC::JSScope*, WTF::RefPtr<JSC::SourceProvider, WTF::DumbPtrTraits<JSC::SourceProvider> >&&, unsigned int, unsigned int)

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