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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