We have detected an awsy regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=348419a9d041ee3a29d4ce5f48073003dac17f50

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

Regressions:

1% Base Content JS osx-10-10-shippable opt 3,982,352.00 -> 4,005,184.00

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=20244

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

This is occurring across all platforms. The patches in Bug 1530412 undo some complex and error-prone bitfields and move some fields to LazyScriptData. The LazyScript struct should be the same size as before, but the LazyScriptData struct grows slightly in cases when it is used. My original estimates for how often the (optional) LazyScriptData is used seem to be way off.

Ted, do you have any updates here?

(In reply to Ionuț Goldan [:igoldan], Performance Sheriffing from comment #2)

Ted, do you have any updates here?

ted?

This is fixed by Bug 1600705.