Bug 265295

Summary:	Speedometer 3: Sync wait in RemoteLayerWithRemoteRenderingBackingStoreCollection::prepareBackingStoresForDisplay
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Matt Woodrow <mattwoodrow>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, Hironori.Fujii, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Matt Woodrow 2023-11-23 16:56:17 PST

Having a synchronous call to prepareBackingStoresForDisplay blocks the main thread, while the GPU Process existing commands (like canvas drawing from rAF).

We should be able to avoid this in the common case, and just asynchronously let the GPU know that we're starting layer drawing for a frame.


<rdar://116792212>

Comment 1 Matt Woodrow 2023-11-23 16:58:19 PST

Pull request: https://github.com/WebKit/WebKit/pull/20858

Comment 2 EWS 2023-12-08 11:20:43 PST

Committed 271747@main (3dd074a9e5d2): <https://commits.webkit.org/271747@main>

Reviewed commits have been landed. Closing PR #20858 and removing active labels.

Comment 3 Fujii Hironori 2023-12-09 00:54:17 PST

Windows port regressed.
  Bug 266138 – REGRESSION(271747@main): [Win] ASSERTION FAILED: canSafelyBeUsed() under WebKit::RemoteImageBufferProxy::streamConnection