linux-kernel - Re: getting oom/stalls for ltp test cpuset01 with latest/4.9 kernel

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Message-ID: <20170111163301.GI16365@dhcp22.suse.cz>
Date:   Wed, 11 Jan 2017 17:33:01 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Ganapatrao Kulkarni <gpkulkarni@...il.com>, linux-mm@...ck.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: getting oom/stalls for ltp test cpuset01 with latest/4.9 kernel

On Wed 11-01-17 12:05:44, Vlastimil Babka wrote:
> On 01/11/2017 11:50 AM, Ganapatrao Kulkarni wrote:
> > Hi,
> > 
> > we are seeing OOM/stalls messages when we run ltp cpuset01(cpuset01 -I
> > 360) test for few minutes, even through the numa system has adequate
> > memory on both nodes.
> > 
> > this we have observed same on both arm64/thunderx numa and on x86 numa system!
> > 
> > using latest ltp from master branch version 20160920-197-gbc4d3db
> > and linux kernel version 4.9
> > 
> > is this known bug already?
> 
> Probably not.
> 
> Is it possible that cpuset limits the process to one node, and numa
> mempolicy to the other node?

No this shouldn't happen AFAICS. It is more likely that there is an
unrelated memory pressure happenning at the same time.
-- 
Michal Hocko
SUSE Labs