Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node`

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Paul E. McKenney 28/11/16 18:05:

>>>> So Paul, I've dropped "mm: Prevent shrink_node_memcg() RCU CPU stall
>>>> warnings" patch, and stalls got back (attached).
>>>>
>>>> With this patch "commit 7cebc6b63bf75db48cb19a94564c39294fd40959" from
>>>> your tree stalls gone. Looks like that.
>>>
>>> So with only this commit and no other commit or configuration adjustment,
>>> everything works?  Or it the solution this commit and some other stuff?
>>>
>>> The reason I ask is that if just this commit does the trick, I should
>>> drop the others.
>>
>> I'd like to ask for some more time to make sure this is it.
>> Approximately 2 or 3 days.
> 
> Works for me!


Well, after some testing I may say, that your patch:
---------------------8<-----------------------------------
commit 7cebc6b63bf75db48cb19a94564c39294fd40959
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
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.

-- 
Boris Zhmurov
System/Network Administrator
mailto: bb@xxxxxxxxxxxxxx
"wget http://kernelpanic.ru/bb_public_key.pgp -O - | gpg --import"

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