linux-kernel - Re: Still OOM problems with 4.9er/4.10er kernels

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Date:   Thu, 16 Mar 2017 10:08:44 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     lkml@...garu.com
Cc:     Gerhard Wiesinger <lists@...singer.com>,
        Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Still OOM problems with 4.9er/4.10er kernels

On Thu 16-03-17 01:47:33, lkml@...garu.com wrote:
[...]
> While on the topic of understanding allocation stalls, Philip Freeman recently
> mailed linux-kernel with a similar report, and in his case there are plenty of
> page cache pages.  It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.

care to point me to the report?
 
> I'm no MM expert, but it appears a bit broken for such a low-order allocation
> to stall on the order of 10 seconds when there's plenty of reclaimable pages,
> in addition to mostly unused and abundant swap space on SSD.

yes this might indeed signal a problem.
-- 
Michal Hocko
SUSE Labs