On Thu, Sep 12, 2013 at 6:22 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > If 'sane' userspace is never supposed to do this, then only insane > userspace is going to hurt from this and that's a GOOD (tm) thing, > right? ;-) Afaik sane userspace doesn't hit the _deadlock_ (or lifelock if we have the set_need_resched in there). drm/i915 is a bit different since we have just one lock, and so the same design would actually deadlock even for sane userspace. But hitting contention there and yielding is somewhat expected. Obviously shouldn't happen too often since it'll hurt performance, with either blocking or the yield spinning loop. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
