WebRender launches a few threads internally. We'd like to be able to profile them, so we need to call functions on thread creation + destruction in order to register + unregister them with the Gecko Profiler.

This works but needs lots of cleanup, and comments, and the rust parts should be rewritten by somebody who actually knows rust.

Peter, would you like to take this over and finish it?

Sure, I can help on this.

It doesn't seem to be capturing any WebRender:WorkerThreads. I haven't checked why that is.

With attachment 8917973 [details] [diff] [review], I'm able to capture WebRender::Backend but not WebRender::WorkerThreads too. I will clean up the patches for landing first because we need this bug for performance profiling.

Any update on how this is going? It would be good to land sooner rather than later.

I think we need to modify here to capture WebRender::WorkerThreads. http://searchfox.org/mozilla-central/source/gfx/webrender_bindings/src/bindings.rs#597

I will take the remaining works.

The WR's pr: https://github.com/servo/webrender/pull/2014

MozReview-Commit-ID: 2gVAmU2xomP

MozReview-Commit-ID: BUyTq2vz3cO

MozReview-Commit-ID: yyFwBr21F3

MozReview-Commit-ID: 7YbQNzTNpmE

fix typo.

MozReview-Commit-ID: 5mIoBmz59SR

try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=df92bd8a3c1da3c4d0543db050d9b78d864f3396

Pushed by hshih@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/8e69fae378b7 export the gecko profiler registering function to WR. r=jrmuizel https://hg.mozilla.org/integration/mozilla-inbound/rev/a6ad193d398e register the WR thread pool's thread to gecko profiler. r=jrmuizel https://hg.mozilla.org/integration/mozilla-inbound/rev/3fe8d225b7ba add a custom thread listener to WR. r=jrmuizel https://hg.mozilla.org/integration/mozilla-inbound/rev/d352680181fc set the window_id as renderer_id to WR. r=jrmuizel

https://hg.mozilla.org/mozilla-central/rev/8e69fae378b7 https://hg.mozilla.org/mozilla-central/rev/a6ad193d398e https://hg.mozilla.org/mozilla-central/rev/3fe8d225b7ba https://hg.mozilla.org/mozilla-central/rev/d352680181fc