[Webkit-unassigned] [Bug 100873] New: attribute modification performance regression

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100873

           Summary: attribute modification performance regression
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ojan at chromium.org
                CC: koivisto at iki.fi, abarth at webkit.org, kling at webkit.org


Regression range: http://trac.webkit.org/log/?verbose=on&rev=132949&stop_rev=132924

http://trac.webkit.org/changeset/132941/ seems like the most likely culprit to me.

Most clear graph. Click on the part in the graph where the performance drops then click on the webkit link on the right to see the webkit blamelist:
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibattrjquery/report.html?rev=165231&graph=jslib_attr_jquery_jQuery___removeClass&trace=score&history=150

Some less clear graphs that point at the same webkit blamelist:
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibattrprototype/report.html?rev=165213&graph=jslib_attr_prototype_Prototype___removeClassName&trace=score&history=150
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibattrprototype/report.html?rev=165213&graph=jslib_attr_prototype_Prototype___writeAttribute&trace=score&history=150
http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibattrjquery/report.html?rev=165213&graph=jslib_attr_jquery_jQuery___attr_class_test_&trace=score&history=150

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