On Thu 24-11-16 15:09:38, Nikolay Borisov wrote:
[...]
> I just checked all the zones for both nodes (the machines have 2 NUMA
> nodes) so essentially there are no reclaimable pages - all are
> anonymous. So the pertinent question is why process are sleeping in
> reclamation path when there are no pages to free. I also observed the
> same behavior on a different node, this time the priority was 0 and the
> code hasn't resorted to OOM. This seems all too strange..
>From my experience we usually hit the memcg OOM quickly if there are no
reclaimable pages. I do not remember anything big changed recently in
that area. Could you enable mm_vmscan_memcg_isolate,
mm_vmscan_memcg_reclaim__{begin,end} and mm_vmscan_lru_shrink_inactive
tracepoints to see what is going on during the reclaim?
I suspect we will see some minor reclaim activity there which will
basically "livelock" the oom from happening but let's see.
--
Michal Hocko
SUSE Labs
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