1331676 - Creating a WebGL context can cause a sync IPC to the parent process

Status: RESOLVED FIXED

(Core :: Graphics: CanvasWebGL, defect)

Description

[(no longer active)]

See this profile for example, where the Msg_GetGraphicsFeatureStatus sync IPC message causes a 1 second pause: <https://clptr.io/2jkHPo0>

This is caused by GfxInfoBase::GetFeatureStatus() delegating to the parent process.  Since the feature status doesn't change after startup, I have a patch that replaces this sync IPC with another sync IPC at startup where we ask the parent process to compute the status of all features, and cache them in the content process.  Since we already do sync IPC at content process startup, this should improve our responsiveness.

Comment 1

[(no longer active)]

Attachment: Avoid doing sync IPC to the parent process for getting gfx feature status

Comment 2

[David Anderson [:dvander] - inactive, e-mail if emergency]

Comment on attachment 8827540 [details] [diff] [review]
Avoid doing sync IPC to the parent process for getting gfx feature status

Review of attachment 8827540 [details] [diff] [review]:
-----------------------------------------------------------------

Seems reasonable.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/mozilla-inbound/rev/2f86db66e8e4
Avoid doing sync IPC to the parent process for getting gfx feature status; r=dvander

Comment 4

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/2f86db66e8e4