[Webkit-unassigned] [Bug 191632] New: Align Mac WK2 layer flush throttling with iOS

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Nov 14 06:18:28 PST 2018


            Bug ID: 191632
           Summary: Align Mac WK2 layer flush throttling with iOS
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: koivisto at iki.fi
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Currently Mac WK2 uses WebCore side throttling implementation in RenderLayerCompositor. This code has throttling timer per-frame while the actual decision making and layer flushes itself are per page. These timers generate way more flushes than expected in presence of multiple frames. There are also bugs in how flushing state is updated when frames are created dynamically.

On iOS WK2 throttling is implemented on WebKit side and controlled by a per-page timer. Recent fixes also make this implementation visually fast. We should align the Mac implementation and eventually unify them.

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