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Groups > linux.kernel > #1535071
| From | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` |
| Date | 2016-12-02 17:50 +0100 |
| Message-ID | <sJZc5-6jb-13@gated-at.bofh.it> (permalink) |
| References | (5 earlier) <sJE7D-85V-31@gated-at.bofh.it> <sJE7D-85V-33@gated-at.bofh.it> <sJE7D-85V-35@gated-at.bofh.it> <sJE7D-85V-13@gated-at.bofh.it> <sJZc5-6jb-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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
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Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` Boris Zhmurov <bb@kernelpanic.ru> - 2016-12-01 19:20 +0100
Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-01 20:40 +0100
Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` Michal Hocko <mhocko@kernel.org> - 2016-12-02 10:40 +0100
Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-02 15:00 +0100
Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-02 17:50 +0100
Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` Michal Hocko <mhocko@kernel.org> - 2016-12-02 18:10 +0100
Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-02 18:20 +0100
Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` Boris Zhmurov <bb@kernelpanic.ru> - 2016-12-02 17:50 +0100
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