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

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Message-ID: <20170316092318.GQ802@shells.gnugeneration.com>
Date:   Thu, 16 Mar 2017 02:23:18 -0700
From:   lkml@...garu.com
To:     Michal Hocko <mhocko@...nel.org>
Cc:     lkml@...garu.com, 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, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
> 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?

http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html

>  
> > 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.

Well maybe I missed something obvious that a better informed eye will catch.

Regards,
Vito Caputo