From: Michal Hocko <mhocko@kernel.org>
To: Boris Zhmurov <bb@kernelpanic.ru>
Cc: paulmck@linux.vnet.ibm.com, Paul Menzel <pmenzel@molgen.mpg.de>,
Donald Buczek <buczek@molgen.mpg.de>,
linux-mm@kvack.org
Subject: Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node`
Date: Wed, 30 Nov 2016 19:25:52 +0100 [thread overview]
Message-ID: <20161130182552.GN18432@dhcp22.suse.cz> (raw)
In-Reply-To: <fd34243c-2ebf-c14b-55e6-684a9dc614e7@kernelpanic.ru>
On Wed 30-11-16 21:12:52, Boris Zhmurov wrote:
> Michal Hocko 30/11/16 20:48:
>
> >> Well, after some testing I may say, that your patch:
> >> ---------------------8<-----------------------------------
> >> commit 7cebc6b63bf75db48cb19a94564c39294fd40959
> >> Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> >> Date: Fri Nov 25 12:48:10 2016 -0800
> >>
> >> mm: Prevent shrink_node_memcg() RCU CPU stall warnings
> >> ---------------------8<-----------------------------------
> >>
> >> fixes stall warning and dmesg is clean now.
> >
> > Do I get it right that s@cond_resched_rcu_qs@cond_resched@ didn't help?
>
> I didn't try that. I've tried 4 patches from Paul's linux-rcu tree.
> I can try another portion of patches, no problem :)
Replacing cond_resched_rcu_qs in shrink_node_memcg by cond_resched would
be really helpful to tell whether we are missing a real scheduling point
or whether something more serious is going on here.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2016-11-30 18:25 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <d6981bac-8e97-b482-98c0-40949db03ca3@kernelpanic.ru>
[not found] ` <20161124133019.GE3612@linux.vnet.ibm.com>
[not found] ` <de88a72a-f861-b51f-9fb3-4265378702f1@kernelpanic.ru>
[not found] ` <20161125212000.GI31360@linux.vnet.ibm.com>
[not found] ` <20161128095825.GI14788@dhcp22.suse.cz>
[not found] ` <20161128105425.GY31360@linux.vnet.ibm.com>
[not found] ` <3a4242cb-0198-0a3b-97ae-536fb5ff83ec@kernelpanic.ru>
[not found] ` <20161128143435.GC3924@linux.vnet.ibm.com>
2016-11-28 14:40 ` INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` Boris Zhmurov
2016-11-28 15:05 ` Paul E. McKenney
2016-11-28 19:16 ` Boris Zhmurov
2016-11-29 18:59 ` Paul E. McKenney
2016-11-30 17:41 ` Boris Zhmurov
2016-11-30 17:48 ` Michal Hocko
2016-11-30 18:12 ` Boris Zhmurov
2016-11-30 18:25 ` Michal Hocko [this message]
2016-11-30 18:26 ` Boris Zhmurov
2016-12-01 18:10 ` Boris Zhmurov
2016-12-01 19:39 ` Paul E. McKenney
2016-12-01 19:39 ` Paul E. McKenney
2016-12-02 9:37 ` Michal Hocko
2016-12-02 9:37 ` Michal Hocko
2016-12-02 13:52 ` Paul E. McKenney
2016-12-02 13:52 ` Paul E. McKenney
2016-12-02 16:39 ` Boris Zhmurov
2016-12-02 16:39 ` Boris Zhmurov
2016-12-02 16:44 ` Paul E. McKenney
2016-12-02 16:44 ` Paul E. McKenney
2016-12-02 17:02 ` Michal Hocko
2016-12-02 17:02 ` Michal Hocko
2016-12-02 17:15 ` Paul E. McKenney
2016-12-02 17:15 ` Paul E. McKenney
2016-11-30 19:42 ` Paul E. McKenney
[not found] <24c226a5-1a4a-173e-8b4e-5107a2baac04@molgen.mpg.de>
2016-11-08 12:22 ` Paul Menzel
2016-11-08 17:03 ` Paul E. McKenney
2016-11-08 17:38 ` Paul Menzel
2016-11-08 18:39 ` Paul E. McKenney
2016-11-16 17:01 ` Paul Menzel
2016-11-16 17:30 ` Paul E. McKenney
2016-11-21 13:41 ` Michal Hocko
2016-11-21 14:01 ` Paul E. McKenney
2016-11-21 14:18 ` Michal Hocko
2016-11-21 14:29 ` Paul E. McKenney
2016-11-21 15:35 ` Donald Buczek
2016-11-24 10:15 ` Michal Hocko
2016-11-24 18:50 ` Donald Buczek
2016-11-27 9:37 ` Paul Menzel
2016-11-27 5:32 ` Christopher S. Aker
2016-11-27 9:19 ` Donald Buczek
2016-11-28 11:04 ` Michal Hocko
2016-11-28 12:26 ` Paul Menzel
2016-11-28 12:26 ` Paul Menzel
2016-11-30 10:28 ` Donald Buczek
2016-11-30 10:28 ` Donald Buczek
2016-11-30 11:09 ` Michal Hocko
2016-11-30 11:09 ` Michal Hocko
2016-11-30 11:43 ` Donald Buczek
2016-11-30 11:43 ` Donald Buczek
2016-12-02 9:14 ` Donald Buczek
2016-12-02 9:14 ` Donald Buczek
2016-12-06 8:32 ` Donald Buczek
2016-12-06 8:32 ` Donald Buczek
2016-11-30 11:53 ` Paul E. McKenney
2016-11-30 11:53 ` Paul E. McKenney
2016-11-30 11:54 ` Paul E. McKenney
2016-11-30 11:54 ` Paul E. McKenney
2016-11-30 12:31 ` Paul Menzel
2016-11-30 12:31 ` Paul Menzel
2016-11-30 14:31 ` Paul E. McKenney
2016-11-30 14:31 ` Paul E. McKenney
2016-11-30 13:19 ` Michal Hocko
2016-11-30 13:19 ` Michal Hocko
2016-11-30 14:29 ` Paul E. McKenney
2016-11-30 14:29 ` Paul E. McKenney
2016-11-30 16:38 ` Peter Zijlstra
2016-11-30 16:38 ` Peter Zijlstra
2016-11-30 17:02 ` Paul E. McKenney
2016-11-30 17:02 ` Paul E. McKenney
2016-11-30 17:05 ` Michal Hocko
2016-11-30 17:05 ` Michal Hocko
2016-11-30 17:23 ` Paul E. McKenney
2016-11-30 17:23 ` Paul E. McKenney
2016-11-30 17:34 ` Michal Hocko
2016-11-30 17:34 ` Michal Hocko
2016-11-30 17:50 ` Peter Zijlstra
2016-11-30 17:50 ` Peter Zijlstra
2016-11-30 19:40 ` Paul E. McKenney
2016-11-30 19:40 ` Paul E. McKenney
2016-12-01 5:30 ` Peter Zijlstra
2016-12-01 5:30 ` Peter Zijlstra
2016-12-01 12:40 ` Paul E. McKenney
2016-12-01 12:40 ` Paul E. McKenney
2016-12-01 16:36 ` Peter Zijlstra
2016-12-01 16:36 ` Peter Zijlstra
2016-12-01 16:59 ` Paul E. McKenney
2016-12-01 16:59 ` Paul E. McKenney
2016-12-01 18:09 ` Peter Zijlstra
2016-12-01 18:09 ` Peter Zijlstra
2016-12-01 18:42 ` Paul E. McKenney
2016-12-01 18:42 ` Paul E. McKenney
2016-12-01 18:49 ` Peter Zijlstra
2016-12-01 18:49 ` Peter Zijlstra
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