From: Michal Hocko <mhocko@kernel.org> To: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org>, Petr Mladek <pmladek@suse.com>, cgroups@vger.kernel.org, Cyril Hrubis <chrubis@suse.cz>, linux-kernel@vger.kernel.org Subject: Re: [PATCH for-4.6-fixes] memcg: remove lru_add_drain_all() invocation from mem_cgroup_move_charge() Date: Wed, 20 Apr 2016 23:27:05 -0400 [thread overview] Message-ID: <20160421032704.GA15585@dhcp22.suse.cz> (raw) In-Reply-To: <20160420212922.GH4775@htj.duckdns.org> On Wed 20-04-16 17:29:22, Tejun Heo wrote: > Hello, Michal. > > On Sun, Apr 17, 2016 at 08:07:48AM -0400, Michal Hocko wrote: [...] > > I liked your proposal when mem_cgroup_move_charge would be called from a > > context which doesn't hold the problematic rwsem much more. Would that > > be too intrusive for the stable backport? > > Yeah, I'm working on the fix but let's plug this one first as it seems > really easy to trigger. I got a couple off-list reports (in and > outside fb) of this triggering. Sure, I think we can use this for an immediate workaround. Nevertheless we want to have a full fix and do not rely on this being the only problem. I would eventually like to reintroduce the draining later when we have a better fix because even though this is not a correctness problem I think we should try hard to not leave anything behind. That being said: Acked-by: Michal Hocko <mhocko@suse.com> -- Michal Hocko SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> Cc: Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, Petr Mladek <pmladek-IBi9RG/b67k@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Cyril Hrubis <chrubis-AlSwsSmVLrQ@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Subject: Re: [PATCH for-4.6-fixes] memcg: remove lru_add_drain_all() invocation from mem_cgroup_move_charge() Date: Wed, 20 Apr 2016 23:27:05 -0400 [thread overview] Message-ID: <20160421032704.GA15585@dhcp22.suse.cz> (raw) In-Reply-To: <20160420212922.GH4775-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org> On Wed 20-04-16 17:29:22, Tejun Heo wrote: > Hello, Michal. > > On Sun, Apr 17, 2016 at 08:07:48AM -0400, Michal Hocko wrote: [...] > > I liked your proposal when mem_cgroup_move_charge would be called from a > > context which doesn't hold the problematic rwsem much more. Would that > > be too intrusive for the stable backport? > > Yeah, I'm working on the fix but let's plug this one first as it seems > really easy to trigger. I got a couple off-list reports (in and > outside fb) of this triggering. Sure, I think we can use this for an immediate workaround. Nevertheless we want to have a full fix and do not rely on this being the only problem. I would eventually like to reintroduce the draining later when we have a better fix because even though this is not a correctness problem I think we should try hard to not leave anything behind. That being said: Acked-by: Michal Hocko <mhocko-IBi9RG/b67k@public.gmane.org> -- Michal Hocko SUSE Labs
next prev parent reply other threads:[~2016-04-21 3:27 UTC|newest] Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-04-13 9:42 [BUG] cgroup/workques/fork: deadlock when moving cgroups Petr Mladek 2016-04-13 18:33 ` Tejun Heo 2016-04-13 18:33 ` Tejun Heo 2016-04-13 18:57 ` Tejun Heo 2016-04-13 18:57 ` Tejun Heo 2016-04-13 19:23 ` Michal Hocko 2016-04-13 19:23 ` Michal Hocko 2016-04-13 19:28 ` Michal Hocko 2016-04-13 19:28 ` Michal Hocko 2016-04-13 19:37 ` Tejun Heo 2016-04-13 19:48 ` Michal Hocko 2016-04-14 7:06 ` Michal Hocko 2016-04-14 7:06 ` Michal Hocko 2016-04-14 15:32 ` Tejun Heo 2016-04-14 15:32 ` Tejun Heo 2016-04-14 17:50 ` Johannes Weiner 2016-04-15 7:06 ` Michal Hocko 2016-04-15 14:38 ` Tejun Heo 2016-04-15 14:38 ` Tejun Heo 2016-04-15 15:08 ` Michal Hocko 2016-04-15 15:08 ` Michal Hocko 2016-04-15 15:25 ` Tejun Heo 2016-04-15 15:25 ` Tejun Heo 2016-04-17 12:00 ` Michal Hocko 2016-04-17 12:00 ` Michal Hocko 2016-04-18 14:40 ` Petr Mladek 2016-04-18 14:40 ` Petr Mladek 2016-04-19 14:01 ` Michal Hocko 2016-04-19 14:01 ` Michal Hocko 2016-04-19 15:39 ` Petr Mladek 2016-04-15 19:17 ` [PATCH for-4.6-fixes] memcg: remove lru_add_drain_all() invocation from mem_cgroup_move_charge() Tejun Heo 2016-04-17 12:07 ` Michal Hocko 2016-04-17 12:07 ` Michal Hocko 2016-04-20 21:29 ` Tejun Heo 2016-04-20 21:29 ` Tejun Heo 2016-04-21 3:27 ` Michal Hocko [this message] 2016-04-21 3:27 ` Michal Hocko 2016-04-21 15:00 ` Petr Mladek 2016-04-21 15:00 ` Petr Mladek 2016-04-21 15:51 ` Tejun Heo 2016-04-21 23:06 ` [PATCH 1/2] cgroup, cpuset: replace cpuset_post_attach_flush() with cgroup_subsys->post_attach callback Tejun Heo 2016-04-21 23:06 ` Tejun Heo 2016-04-21 23:09 ` [PATCH 2/2] memcg: relocate charge moving from ->attach to ->post_attach Tejun Heo 2016-04-21 23:09 ` Tejun Heo 2016-04-22 13:57 ` Petr Mladek 2016-04-22 13:57 ` Petr Mladek 2016-04-25 8:25 ` Michal Hocko 2016-04-25 8:25 ` Michal Hocko 2016-04-25 19:42 ` Tejun Heo 2016-04-25 19:42 ` Tejun Heo 2016-04-25 19:44 ` Tejun Heo 2016-04-25 19:44 ` Tejun Heo 2016-04-21 23:11 ` [PATCH 1/2] cgroup, cpuset: replace cpuset_post_attach_flush() with cgroup_subsys->post_attach callback Tejun Heo 2016-04-21 23:11 ` Tejun Heo 2016-04-21 15:56 ` [PATCH for-4.6-fixes] memcg: remove lru_add_drain_all() invocation from mem_cgroup_move_charge() Tejun Heo 2016-04-21 15:56 ` Tejun Heo
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