On pe, 2017-05-05 at 14:57 -0700, Hugh Dickins wrote: > On Fri, 5 May 2017, Joonas Lahtinen wrote: > > On ma, 2017-05-01 at 11:05 +0900, J. R. Okajima wrote: > > > Thanx for the reply. > > > > > > Andrea Arcangeli: > > > > > > > > Yes I already reported this, my original fix was way more efficient > > > > (and also safer considering the above) than what landed upstream. My > > > > feedback was ignored though. > > > > > > > > https://lists.freedesktop.org/archives/intel-gfx/2017-April/125414.html > > > > > > I see. > > > Actually on my test system for v4.11-rc8, kthreadd, kworker, kswapd and > > > others all stopped working due to the synchronize_rcu_expedited call > > > from i915_gem_shrinker_count. It is definitly a show stopper for me as > > > an i915 user. > > > > Filing a bug in freedesktop.org with all the details is the fastest way > > of getting help. Without the bug (and with such little information as > > the previous e-mail) it's hard to estimate the extent and nature of the > > bug. > > > > I've anyway gone and prepared a patch to drop the RCU sync completely > > from shrinker phase, as discussed originally with Chris. > > Is that a patch that will be suitable for 4.11-stable? Please do post > it here. I had not experienced this i915-induced hang at all when > Andrea first mentioned it, nor even on 4.11-rc8; but now with 4.11 > final I can get it fairly easily (I haven't tried Andrea's fix yet).
Please try: https://patchwork.freedesktop.org/patch/154713/ If it works, a Tested-by: would be appreciated. Regards, Joonas -- Joonas Lahtinen Open Source Technology Center Intel Corporation
