Raptor has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=12c9312e15bb4de1a989351d273c3866c5603462

As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

3% raptor-tp6m-google-maps-geckoview-cold fcp android-hw-g5-7-0-arm7-api-16 pgo 1,147.96 -> 1,179.08

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=25061

On the page above you can see an alert for each affected platform as well as a link to a graph showing the history of scores for this test. There is also a link to a Treeherder page showing the Raptor jobs in a pushlog format.

To learn more about the regressing test(s) or reproducing them, please see: https://wiki.mozilla.org/TestEngineering/Performance/Raptor

*** Please let us know your plans within 3 business days, or the offending patch(es) will be backed out! ***

Our wiki page outlines the common responses and expectations: https://wiki.mozilla.org/TestEngineering/Performance/Talos/RegressionBugsHandling

Turns out we have one more copy of the PGO-initializing mozconfig code for
Android, and that one was not enabling LTO.

https://hg.mozilla.org/mozilla-central/rev/562749d5a8dc

== Change summary for alert #25325 (as of Wed, 11 Mar 2020 08:58:35 GMT) ==

Improvements:

5% raptor-tp6m-google-maps-geckoview-cold fcp android-hw-g5-7-0-arm7-api-16 pgo 1,203.23 -> 1,142.75
3% raptor-tp6m-google-maps-geckoview-cold fcp android-hw-g5-7-0-arm7-api-16 pgo 1,179.38 -> 1,147.33

For up to date results, see: https://treeherder.mozilla.org/perf.html#/alerts?id=25325