Messages in this thread | | | Date | Fri, 5 May 2017 14:57:18 -0700 (PDT) | From | Hugh Dickins <> | Subject | Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers |
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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).
Hugh
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