1636382 - 0.34 - 0.38% Base Content JS (linux1804-64-shippable, linux1804-64-shippable-qr, macosx1014-64-shippable) regression on push 8e5e6fd199d3d503b38f267901b737751b710413 (Tue May 5 2020)

Status: RESOLVED WONTFIX

(Core :: DOM: Bindings (WebIDL), defect)

Description

[Marian Raiciof [:marauder]]

Perfherder has detected an awsy performance regression from push 8e5e6fd199d3d503b38f267901b737751b710413. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

0.38% Base Content JS linux1804-64-shippable-qr opt 3,697,852.00 -> 3,711,802.67
0.37% Base Content JS linux1804-64-shippable opt 3,697,852.67 -> 3,711,673.33
0.37% Base Content JS macosx1014-64-shippable opt 3,699,654.00 -> 3,713,304.67
0.34% Base Content JS linux1804-64-shippable-qr opt 3,697,898.67 -> 3,710,556.67

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) will be backed out in accordance with our regression policy.

For more information on performance sheriffing please see our FAQ.

Comment 1

[Tom S [:evilpie]]

Unfortunately I don't think there is much we can do here ... All DOM interfaces prototypes now have an additional property plus we allocate a string. I doubt we want to introduce some kind of lazy resolve just for this.

Comment 2

[Tom S [:evilpie]]

I doubt we are going to fix this.