[webkit-dev] Chromium PLT regression

Adam Barth abarth at webkit.org
Tue Oct 4 22:37:58 PDT 2011

About a week ago, the Chromium project measured a PLT regression on
Windows, Mac, and Linux:


I don't know whether the regression affects any other ports, but
according to the Chromium performance bots, the regression occurred in
this range:


Normally, the Chromium project has a bot continuously running the PLT
against WebKit trunk, but, due to a configuration error, that bot was
been offline for about 10 days, which, unfortunately, includes the
time period in question.  The bot is now back online:


I'm not able to reproduce the regression locally.  Sometime in the
next couple days, when the tree is quiet (which probably means at
night PST), I'd like to try to hunt down which revision in that range
caused the regression by rolling out the patches.  If I roll out your
patch as part of this process, do not worry.  I'll roll it back in
shortly thereafter.  My hope is that this experiment will allow us to
isolate the exact revision that caused the regression.

If anyone is able to reproduce the issue locally, that would certainly
be better than me making a mess by rolling patches in and out of the
main tree.


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