[Webkit-unassigned] [Bug 100872] New: r132913 caused a bunch of performance regressions and progressions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100872

           Summary: r132913 caused a bunch of performance regressions and
                    progressions
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ojan at chromium.org
                CC: abarth at webkit.org, dcarney at google.com


http://trac.webkit.org/changeset/132913/ caused a bunch of performance regressions and progressions. Typically, we have a no perf regression policy in the tree. I think we should rollout for now and see if there is a fix that only improves performance. This will also help to verify that the other perf regressions I'm seeing are not from this patch. Sound OK?

Regressions:
http://build.chromium.org/f/chromium/perf/mac-release-10.6-webkit-latest/dom_perf/report.html?rev=165183&graph=Events&trace=score&history=150
http://build.chromium.org/f/chromium/perf/mac-release-10.6-webkit-latest/dromaeo_domcorequery/report.html?rev=164983&graph=dom_query_getElementById&trace=score&history=150


Progressions:
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibattrjquery/report.html?rev=165203&graph=jslib_attr_jquery_jQuery___addClass&trace=score&history=150
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibattrjquery/report.html?rev=165139&graph=jslib_attr_jquery_jQuery___hasClass_x10&trace=score&history=150
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dom_perf/report.html?rev=165231&graph=Total&trace=score&history=150
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dom_perf/report.html?rev=165213&graph=Get%20Elements&trace=score&history=150
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dom_perf/report.html?rev=165231&graph=DOMDivWalk&trace=score&history=150

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