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

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

On Mon, Nov 28, 2016 at 10:16:33PM +0300, Boris Zhmurov wrote:
> Paul E. McKenney 28/11/16 18:05:
> > On Mon, Nov 28, 2016 at 05:40:48PM +0300, Boris Zhmurov wrote:
> >> Paul E. McKenney 28/11/16 17:34:
> >>
> >>
> >>>> 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!
> > 
> > 							Thanx, Paul
> 
> 
> FYI.
> Some more stalls with mm-prevent-shrink_node-RCU-CPU-stall-warning.patch
> and without mm-prevent-shrink_node_memcg-RCU-CPU-stall-warnings.patch.

Thank you for the info!  Is this one needed?  2d66cccd7343 ("mm: Prevent
__alloc_pages_nodemask() RCU CPU stall warnings")

It is causing trouble in other tests.  If it is needed, I must fix it,
if not, I can happily drop it.  ;-)

							Thanx. Paul

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