[Webkit-unassigned] [Bug 251725] New: FloatingState::m_floats wastes 30KB of vector capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251725

            Bug ID: 251725
           Summary: FloatingState::m_floats wastes 30KB 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 FloatingState::m_floats wastes 30KB of vector capacity:

Wasted capacity: 30888 bytes (used 2392 of 33280 bytes, utilization: 7.19%) - 216 allocations
5   0x82646e57d WTF::VectorBuffer<WebCore::Layout::FloatingState::FloatItem, 0ul, WTF::FastMalloc>::VectorBuffer()
6   0x82646e545 WTF::Vector<WebCore::Layout::FloatingState::FloatItem, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::Vector()
7   0x82644b9c5 WTF::Vector<WebCore::Layout::FloatingState::FloatItem, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::Vector()
8   0x82644b91d WebCore::Layout::FloatingState::FloatingState(WebCore::Layout::LayoutState&, WebCore::Layout::ElementBox const&)
9   0x82644ba15 WebCore::Layout::FloatingState::FloatingState(WebCore::Layout::LayoutState&, WebCore::Layout::ElementBox const&)
10  0x826460b4c WebCore::Layout::BlockFormattingState::BlockFormattingState(WebCore::Layout::LayoutState&, WebCore::Layout::ElementBox const&)
11  0x826460be5 WebCore::Layout::BlockFormattingState::BlockFormattingState(WebCore::Layout::LayoutState&, WebCore::Layout::ElementBox const&)

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