I have documented this here: <
https://developer.mozilla.org/en-US/docs/Developer_Guide/Committing_Rules_and_Responsibilities#Dealing_with_performance_regressions
>

--
Ehsan
<http://ehsanakhgari.org/>


On Thu, Oct 18, 2012 at 2:05 PM, Ehsan Akhgari <ehsan.akhg...@gmail.com>wrote:

> Hi everyone,
>
> As part of our efforts to get more value out of the Talos test suite for
> preventing performance regressions, we believe that we are now ready to put
> a first set of measures against startup time regressions.  We will start by
> imposing a new backout policy for mozilla-inbound checkins for regressions
> more than 4% on any given platform.  If your patch falls in a range which
> causes more than 4% Ts regression, it will be backed out by our sheriffs
> together with the rest of the patches in that range, and you can only
> reland after you fix the regression by testing locally or on the try server.
>
> The 4% threshold has been chosen based on anecdotal evidence on the most
> recent Ts regressions that we have seen, and is too generous, but we will
> be working to improve the reporting and regression detection systems
> better, and as those get improved, we would feel more comfortable with
> imposing this policy on other Talos tests with tighter thresholds.
>
> Please let me know if you have any questions.
>
> Cheers,
> --
> Ehsan
> <http://ehsanakhgari.org/>
>
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