On Mon, Jun 29, 2015 at 06:23:30AM +0900, Mike Hommey wrote: > On Sun, Jun 28, 2015 at 10:09:04PM +0200, David Rajchenbach-Teller wrote: > > On 28/06/15 20:39, Randell Jesup wrote: > > >>> I was under the impression that because e10s is only a single process > > >>> for > > >> all content (at least right now) a background tab can still negatively > > >> affect the foreground tab. > > >> > > >> That's right, but we also tested e10s in the process-per-tab > > >> configuration > > > > > > There are other options for background tab effects on foreground, though > > > all have some sort of impact. (For example, you could 'freeze' > > > background tabs more aggressively than we currently do. This may have > > > some impact on functionality - we already limit timeouts, but IIRC we > > > don't turn them off entirely, and other events still occur that we could > > > defer until the tab is touched or ignore - but again, that could cause > > > sites to break or make switching back problematic/annoying. However, > > > I'm out of touch with the exact state of our 'freezing' of background > > > tabs. And there are certainly sites where they'll eat your performance > > > (eventually) unless you block everything. > > > > Actually, I was just thinking about introducing a "priority-to-60fps" > > mode, activated e.g. while the user is scrolling the foreground tab, or > > perhaps during animations in the foreground tab. > > > > Whenever we are running in "priority-to-60fps" mode, we can delay up to > > N milliseconds main thread treatments such as: > > - garbage-collection/cycle-collection; > > - dispatching events to background tabs (including timeouts); > > - Session Restore; > > - Thumbnail creation; > > - FHR; > > - Sync; > > - db flushes; > > - copying large batches of data to worker threads; > > - performance monitoring; > > - ... > > BTW, wasn't there an effort a few couple years ago, to move content > event loop in different threads for different tabs? What happened to > that?
Speaking of threads, do we already fiddle with thread priorities so that the OMTC thread possibly gets more time slices? Mike _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
