[MitchellCash]

> Continuing work to restructure Firefox’s JavaScript memory management to be more performant and use less memory.

I went back the last few versions major release notes and didn’t see mention of the initial work to improve the JavaScript memory management. Is anyone aware of this work/what’s going on to improve memory management here? Interested to read more about the technicals!

[mccr8]

This is probably referring to some work to use Stencil for self-hosted code. That reduced process overhead by 6%, which is quite a bit: https://bugzilla.mozilla.org/show_bug.cgi?id=1688794

There might have been some other Stencil work that landed in 92 to reduce memory.

There's a description of what Stencil is, and some work related to it that landed in Firefox 90 and 91, here: https://spidermonkey.dev/blog/2021/07/19/newsletter-firefox-...

[sfink]

I believe this refers to the constellation of work surrounding the ReShape hidden class datastructure refactoring https://bugzilla.mozilla.org/show_bug.cgi?id=reshape

There was an initial change and then various bits of followup work to take advantage of it.

(Ah. mccr8 says it's Stencil. That probably makes more sense.)

[KeyBoardG]

I'm interested as well since they had a layoff of the Servo team. Did they rebuild that team with unannounced hires? Outside contributions?

[sfink]

Servo has very little to do with JavaScript, so no.

The parts of Servo that made it into Firefox are still being worked on by Firefox developers. I don't know how much activity is happening on the now-external Servo project itself.