On Tue, 2014-04-29 at 20:13 -0400, Steven Rostedt wrote: > On Tue, 29 Apr 2014 07:21:09 +0200 > Mike Galbraith <umgwanakikbuti@xxxxxxxxx> wrote: > > > On Mon, 2014-04-28 at 16:37 +0200, Mike Galbraith wrote: > > > > > > Seems that migrate_disable() must be called before taking the lock as > > > > it is done in every other location. > > > > > > And for tasklist_lock, seems you also MUST do that prior to trylock as > > > well, else you'll run afoul of the hotplug beast. > > > > Bah. Futzing with dmesg while stress script is running is either a very > > bad idea, or a very good test. Both virgin 3.10-rt and 3.12-rt with new > > bugs squashed will deadlock. > > > > Too bad I kept on testing, I liked the notion that hotplug was solid ;-) > > I was able to stress cpu hotplug on 3.12-rt after applying the > following patch. > > If there's no complaints about it. I'm going to add this to the 3.12-rt > stable tree. As without it, it fails horribly with the cpu hotplug > stress test, and I wont release a stable kernel that does that. My local boxen are happy, 64 core box with 14-rt seems happy as well, though I couldn't let it burn for long. BTW, that dmesg business went into hiding. I didn't have time to put virgin 10-rt back on and play around poking both kernels this that and the other way again, but seems there's some phase-of-moon factor there. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
