From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752798AbdEEX3C (ORCPT ); Fri, 5 May 2017 19:29:02 -0400 Received: from mail02-md.ns.itscom.net ([175.177.155.112]:35126 "EHLO mail02-md.ns.itscom.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750951AbdEEX3B (ORCPT ); Fri, 5 May 2017 19:29:01 -0400 From: "J. R. Okajima" Subject: Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers To: Joonas Lahtinen Cc: Andrea Arcangeli , chris@chris-wilson.co.uk, daniel.vetter@ffwll.ch, jani.nikula@intel.com, linux-kernel@vger.kernel.org In-Reply-To: <1493977180.3551.24.camel@linux.intel.com> References: <7743.1493532478@jrobl> <20170430094348.GA5970@redhat.com> <16988.1493604328@jrobl> <1493977180.3551.24.camel@linux.intel.com> Date: Sat, 06 May 2017 08:28:59 +0900 Message-ID: <17413.1494026939@jrobl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Joonas Lahtinen: > 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. My original report was http://marc.info/?l=linux-kernel&m=149313183203325&w=2 The report contained - kernel command line options - lockdep msg - call trace but it didn't look drm/i915 shrinker is related. It was git-bisect which lead me to drm/i915 shrinker. > I've anyway gone and prepared a patch to drop the RCU sync completely > from shrinker phase, as discussed originally with Chris. Thank you. I don't know whether the fix is good to me or not yet. I will test your fix, but I am busy now and my test will be a few weeks later. Other people may want the fix soon. So I'd suggest you to reproduce the problem on your side. I guess "mem=1G" or "mem=512M" will make it easier to reproduce the problem. Of course, if you are sure the fix is correct, then you don't have to wait for my test. Release it soon for other people. J. R. Okajima