Messages in this thread | | | Date | Fri, 2 Dec 2016 08:44:08 -0800 | From | "Paul E. McKenney" <> | Subject | Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` |
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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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