We have detected an awsy regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=2428766459c6339fcafdc437dfb45beba59e6de2

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

Regressions:

10% Heap Unclassified windows10-64-shippable opt 47,930,510.64 -> 52,503,294.43
9% Heap Unclassified windows10-64-shippable-qr opt 55,676,570.30 -> 60,841,405.55
7% Heap Unclassified windows10-64-shippable-qr opt stylo tp6 73,278,056.52 -> 78,604,625.61
7% Heap Unclassified windows10-64-shippable opt stylo tp6 65,895,326.83 -> 70,464,817.05
6% Heap Unclassified linux64-shippable opt 82,432,589.20 -> 87,599,821.41
6% Heap Unclassified macosx1010-64-shippable opt 78,355,585.39 -> 83,053,007.02
6% Heap Unclassified linux64-shippable opt 82,381,510.96 -> 87,274,778.01
6% Heap Unclassified macosx1010-64-shippable opt stylo tp6 91,007,553.68 -> 96,038,525.04
3% Base Content Heap Unclassified windows10-64-shippable-qr opt 1,581,973.33 -> 1,621,587.33
2% Explicit Memory windows10-64-shippable-qr opt 356,876,080.14 -> 365,419,673.97

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=21194

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 jobs in a pushlog format.

To learn more about the regressing test(s), please see: https://wiki.mozilla.org/AWSY/Tests

Should look better now, mind confirming?

== Change summary for alert #21281 (as of Tue, 04 Jun 2019 08:59:45 GMT) ==

Improvements:

7% Heap Unclassified windows10-64-shippable opt 52,435,580.72 -> 48,816,289.52
6% Heap Unclassified windows10-64-shippable-qr opt 60,870,352.68 -> 57,208,173.31
5% Heap Unclassified windows10-64-shippable opt stylo tp6 70,864,549.78 -> 67,020,993.66
5% Heap Unclassified windows10-64-shippable-qr opt stylo tp6 79,055,258.33 -> 74,913,882.60
5% Heap Unclassified linux64-shippable opt 87,818,724.69 -> 83,456,992.42
5% Heap Unclassified macosx1010-64-shippable opt 82,920,922.19 -> 78,884,161.58
5% Heap Unclassified windows7-32-shippable opt 39,670,934.48 -> 37,876,590.70
4% Heap Unclassified macosx1010-64-shippable opt stylo tp6 96,172,564.88 -> 92,328,539.74
3% Heap Unclassified linux64-shippable opt stylo tp6 103,179,454.69 -> 99,747,160.31

For up to date results, see: https://treeherder.mozilla.org/perf.html#/alerts?id=21281

:emilio these are the some improvments that we think are related to this bug... Still waiting for the back fills to confirm for sure.

Yes, that'd make sense. Feel free to resolve if they are :)

I'm moderately sure at this point they are, so duping to bug 1555867. But please reopen if there remains other regressions worth looking into.