linux-kernel - Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected)

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Message-ID: <20170112093613.GF2264@dhcp22.suse.cz>
Date:   Thu, 12 Jan 2017 10:36:14 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Trevor Cordes <trevor@...nopolis.ca>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected)

On Wed 11-01-17 16:52:32, Trevor Cordes wrote:
[...]
> I'm not sure how I can tell if my bug is because of memcgs so here is
> a full first oom example (attached).

4.7 kernel doesn't contain 71c799f4982d ("mm: add per-zone lru list
stat") so the OOM report will not tell us whether the Normal zone
doesn't age active lists, unfortunatelly.

You can easily check whether this is memcg related by trying to run the
same workload with cgroup_disable=memory kernel command line parameter.
This will put all the memcg specifics out of the way.
-- 
Michal Hocko
SUSE Labs