[Webkit-unassigned] [Bug 83784] New: [Qt][WK2] Waiting for the UI process when rendering is unnecessary in certain situations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=83784

           Summary: [Qt][WK2] Waiting for the UI process when rendering is
                    unnecessary in certain situations
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: Qt
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: noam.rosenthal at nokia.com
                CC: hausmann at webkit.org, kenneth at webkit.org,
                    ostapenko.viatcheslav at nokia.com,
                    jocelyn.turcotte at nokia.com


Right now we have a very simple synchronization mechanism between rendering in the web process and using the rendered results in the UI process - the web process simply waits with further updates until the UI process is done. This was done to prevent the web process from "accumulating" updates and hogging memory. However, since we're using an update atlas, the updates are bound to the atlas memory limit, thus not allowing that kind of hogging.
An alternative approach would be to allow the web process to continue updating until the buffer is full, allowing a faster frame-rate (potentially double?) in situations where rendering in the web process is fast.

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