[Webkit-unassigned] [Bug 251699] New: FormattingState::m_outOfFlowBoxes wastes a lot of vector capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251699

            Bug ID: 251699
           Summary: FormattingState::m_outOfFlowBoxes wastes a lot of
                    vector capacity
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan 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: 1293768 bytes (used 321640 of 1615408 bytes, utilization: 19.91%) - 219 allocations
1   0x11045bc0f WebCore::Layout::InlineFormattingState::InlineFormattingState(WebCore::Layout::LayoutState&)
2   0x11043d1fa WebCore::Layout::LayoutState::ensureInlineFormattingState(WebCore::Layout::ElementBox const&)

Wasted capacity: 27456 bytes (used 2112 of 29568 bytes, utilization: 7.14%) - 219 allocations
1   0x11044c8b9 WebCore::Layout::BlockFormattingState::BlockFormattingState(WebCore::Layout::LayoutState&, WebCore::Layout::ElementBox const&)
2   0x11043d41f WebCore::Layout::LayoutState::ensureBlockFormattingState(WebCore::Layout::ElementBox const&)

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