NEW 214650
[iOS] Avoid rebuilding MobileGestalt cache if IOKit is busy 
https://bugs.webkit.org/show_bug.cgi?id=214650
Summary [iOS] Avoid rebuilding MobileGestalt cache if IOKit is busy
Per Arne Vollan
Reported 2020-07-22 12:52:59 PDT
If IOKit is busy, any attempt to rebuild the MobileGestalt cache will likely fail after a timeout. To avoid blocking the main thread in the UI process, skip rebuilding the MobileGestalt cache if IOKit is busy.
Attachments
Patch (4.18 KB, patch)
2020-07-22 13:03 PDT, Per Arne Vollan 		ap: review-
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Per Arne Vollan
Comment 1 2020-07-22 12:53:43 PDT
rdar://problem/65882633
Per Arne Vollan
Comment 2 2020-07-22 13:03:06 PDT
Created attachment 404954 [details] Patch
Geoffrey Garen
Comment 3 2020-07-22 13:24:11 PDT
Today, if the MG cache is invalid, we get hang reports about it. That's not the best signal, but it's some signal nonetheless. I can see how this patch would make the hang go away, but the next thing that will happen is a mysterious failure in the WebContent process (most likely a failure to play media). Is that an improvement? Did we find to what exactly what keeping IOKit busy on the device that triggered this hang?
Alexey Proskuryakov
Comment 4 2020-07-23 17:45:37 PDT
Comment on attachment 404954 [details] Patch r- because of red EWS, but yes, what Geoff said.
Note You need to log in before you can comment on or make changes to this bug.