[Webkit-unassigned] [Bug 251697] New: EventListenerMap's m_entries vector wastes a lot of vector capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251697

            Bug ID: 251697
           Summary: EventListenerMap's m_entries vector wastes a lot of
                    vector capacity
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Using the patch in bug 186698, and testing on a wikipedia page, we see that EventListenerMap::m_entries is the second-most wasteful site for vector capacity:

Wasted capacity: 65640 bytes (used 6680 of 72320 bytes, utilization: 9.24%) - 1923 allocations
1   0x2fc39b217 WebCore::EventListenerMap::EventListenerMap()
2   0x2fcd93008 WebCore::RenderObject::RenderObject(WebCore::Node&)
3   0x2fcceef18 WebCore::RenderElement::RenderElement(WebCore::Element&, WebCore::RenderStyle&&, unsigned int)
4   0x2fcd69351 WebCore::RenderLayerModelObject::RenderLayerModelObject(WebCore::Element&, WebCore::RenderStyle&&, unsigned int)
5   0x2fccbe2b1 WebCore::RenderBoxModelObject::RenderBoxModelObject(WebCore::Element&, WebCore::RenderStyle&&, unsigned int)
6   0x2fcd287b3 WebCore::RenderInline::RenderInline(WebCore::Element&, WebCore::RenderStyle&&)

Wasted capacity: 7960 bytes (used 1000 of 8960 bytes, utilization: 11.16%) - 278 allocations
1   0x2fc39b217 WebCore::EventListenerMap::EventListenerMap()
2   0x2fcd93008 WebCore::RenderObject::RenderObject(WebCore::Node&)
3   0x2fcceef18 WebCore::RenderElement::RenderElement(WebCore::Element&, WebCore::RenderStyle&&, unsigned int)
4   0x2fcd69351 WebCore::RenderLayerModelObject::RenderLayerModelObject(WebCore::Element&, WebCore::RenderStyle&&, unsigned int)
5   0x2fccbe261 WebCore::RenderBox::RenderBox(WebCore::Element&, WebCore::RenderStyle&&, unsigned int)

Wasted capacity: 3400 bytes (used 440 of 3840 bytes, utilization: 11.46%) - 7 allocations
1   0x2fc39b217 WebCore::EventListenerMap::EventListenerMap()
2   0x2fc5e7fb0 WebCore::CheckboxInputType::CheckboxInputType(WebCore::HTMLInputElement&)
3   0x2fc5e73e8 WTF::Ref<WebCore::InputType, WTF::RawPtrTraits<WebCore::InputType> > WebCore::createInputType<WebCore::CheckboxInputType>(WebCore::HTMLInputElement&)
4   0x2fc5e0772 WebCore::InputType::createIfDifferent(WebCore::HTMLInputElement&, WTF::AtomString const&, WebCore::InputType*)

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