[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 #6 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Just saw almost 400KB on theverge.com:

Wasted capacity: 394016 bytes (used 58952 of 452968 bytes, utilization: 13.01%). 4460 allocations. Non-empty size range 8 to 888, non-empty capacity range 128-1088
1   0x1156dc9b5 WTF::VectorBuffer<WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::Segment*, 0ul>::VectorBuffer()
2   0x1156dc995 WTF::Vector<WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::Segment*, 0ul, WTF::CrashOnOverflow, 16ul>::Vector()
3   0x1156dc975 WTF::Vector<WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::Segment*, 0ul, WTF::CrashOnOverflow, 16ul>::Vector()
4   0x1156dc950 WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::SegmentedVector()
5   0x1156c34c5 WTF::SegmentedVector<JSC::ArrayProfile, 4ul>::SegmentedVector()
6   0x1156c4c0d 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)

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