[Webkit-unassigned] [Bug 165712] New: The DOM should have an advancing wavefront opaque root barrier

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165712

            Bug ID: 165712
           Summary: The DOM should have an advancing wavefront opaque root
                    barrier
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

I thought that I wouldn't need a barrier because of how the weak fixpoint works, but we still do need a barrier when root relationships change.

Fortunately, this isn't so difficult.

We could do a retreating wavefront barrier eventually, which would improve performance in programs that churn a lot of DOM things during an eden collection.  But I think that's a rare enough case - since eden collections are short - that I'm OK with not caring initially.

Thanks @rniwa for coming up with the algorithm on IRC.

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