From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Boris Zhmurov <bb@kernelpanic.ru>
Cc: Michal Hocko <mhocko@kernel.org>,
Paul Menzel <pmenzel@molgen.mpg.de>,
Donald Buczek <buczek@molgen.mpg.de>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node`
Date: Fri, 2 Dec 2016 08:44:08 -0800 [thread overview]
Message-ID: <20161202164408.GM3924@linux.vnet.ibm.com> (raw)
In-Reply-To: <a21ba936-0b8e-fd8e-620e-933850cc992d@kernelpanic.ru>
On Fri, Dec 02, 2016 at 07:39:24PM +0300, Boris Zhmurov wrote:
> Paul E. McKenney Thu Dec 01 2016 - 14:39:21 EST:
>
> >> Well, I can confirm, that replacing cond_resched_rcu_qs in
> >> shrink_node_memcg by cond_resched also makes dmesg clean from RCU
> >> CPU stall warnings.
> >>
> >> I've attached patch (just modification of Paul's patch), that
> >> fixes RCU stall messages in situations, when all memory is used by
> >> couchbase/memcached + fs cache and linux starts to use swap.
>
> > Nice! Just to double-check, could you please also test your patch
> > above with these two commits from -rcu?
> >
> > d2db185bfee8 ("rcu: Remove short-term CPU kicking") f8f127e738e3
> > ("rcu: Add long-term CPU kicking")
> >
> > Thanx, Paul
>
>
> Looks like patches d2db185bfee8 and f8f127e738e3 change nothing.
>
> With cond_resched() in shrink_node_memcg and these two patches dmesg is
> clean. No any RCU CPU stall messages.
Very good! I have these two patches queued for 4.11.
And thank you again for all the testing!!!
Thanx, Paul
next prev parent reply other threads:[~2016-12-02 16:44 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
[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>
[not found] ` <eba1571e-f7a8-09b3-5516-c2bc35b38a83@kernelpanic.ru>
[not found] ` <20161128150509.GG3924@linux.vnet.ibm.com>
[not found] ` <66fd50e1-a922-846a-f427-7654795bd4b5@kernelpanic.ru>
[not found] ` <20161130174802.GM18432@dhcp22.suse.cz>
[not found] ` <fd34243c-2ebf-c14b-55e6-684a9dc614e7@kernelpanic.ru>
[not found] ` <20161130182552.GN18432@dhcp22.suse.cz>
2016-12-01 18:10 ` INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` Boris Zhmurov
2016-12-01 19:39 ` Paul E. McKenney
2016-12-02 9:37 ` Michal Hocko
2016-12-02 13:52 ` Paul E. McKenney
2016-12-02 16:39 ` Boris Zhmurov
2016-12-02 16:44 ` Paul E. McKenney [this message]
2016-12-02 17:02 ` Michal Hocko
2016-12-02 17:15 ` 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
2016-11-30 10:28 ` Donald Buczek
2016-11-30 11:09 ` Michal Hocko
2016-11-30 11:43 ` Donald Buczek
2016-12-02 9:14 ` Donald Buczek
2016-12-06 8:32 ` Donald Buczek
2016-11-30 11:53 ` Paul E. McKenney
2016-11-30 11:54 ` Paul E. McKenney
2016-11-30 12:31 ` Paul Menzel
2016-11-30 14:31 ` Paul E. McKenney
2016-11-30 13:19 ` Michal Hocko
2016-11-30 14:29 ` Paul E. McKenney
2016-11-30 16:38 ` Peter Zijlstra
2016-11-30 17:02 ` Paul E. McKenney
2016-11-30 17:05 ` Michal Hocko
2016-11-30 17:23 ` Paul E. McKenney
2016-11-30 17:34 ` Michal Hocko
2016-11-30 17:50 ` Peter Zijlstra
2016-11-30 19:40 ` Paul E. McKenney
2016-12-01 5:30 ` Peter Zijlstra
2016-12-01 12:40 ` Paul E. McKenney
2016-12-01 16:36 ` Peter Zijlstra
2016-12-01 16:59 ` Paul E. McKenney
2016-12-01 18:09 ` Peter Zijlstra
2016-12-01 18:42 ` Paul E. McKenney
2016-12-01 18:49 ` Peter Zijlstra
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