Re: Still OOM problems with 4.9er/4.10er kernels

From	Michal Hocko <mhocko@kernel.org>
Newsgroups	linux.kernel
Subject	Re: Still OOM problems with 4.9er/4.10er kernels
Date	2017-03-16 10:40 +0100
Message-ID	<tlA30-4H0-13@gated-at.bofh.it> (permalink)
References	(5 earlier) <tlxot-2Mg-13@gated-at.bofh.it> <tlyXg-3YD-35@gated-at.bofh.it> <tlzgC-45R-25@gated-at.bofh.it> <tlzzY-4tY-31@gated-at.bofh.it> <tlzTk-4Bt-29@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu 16-03-17 02:23:18, lkml@pengaru.com wrote:
> On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
> > On Thu 16-03-17 01:47:33, lkml@pengaru.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

Thanks. It is gone from my lkml mailbox. Could you CC me (and linux-mm) please?
 
> >  
> > > 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.

Nothing really obvious. There is indeed a lot of anonymous memory to
swap out. Almost no pages on file LRU lists (active_file:759
inactive_file:749) but 158783 total pagecache pages so we have to have a
lot of pages in the swap cache. I would probably have to see more data
to make a full picture.

-- 
Michal Hocko
SUSE Labs

Thread

Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-16 07:50 +0100
  Re: Still OOM problems with 4.9er/4.10er kernels Michal Hocko <mhocko@kernel.org> - 2017-03-16 09:30 +0100
    Re: Still OOM problems with 4.9er/4.10er kernels lkml@pengaru.com - 2017-03-16 09:50 +0100
      Re: Still OOM problems with 4.9er/4.10er kernels Michal Hocko <mhocko@kernel.org> - 2017-03-16 10:10 +0100
        Re: Still OOM problems with 4.9er/4.10er kernels lkml@pengaru.com - 2017-03-16 10:30 +0100
          Re: Still OOM problems with 4.9er/4.10er kernels Michal Hocko <mhocko@kernel.org> - 2017-03-16 10:40 +0100
            Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-17 17:50 +0100
              Re: Still OOM problems with 4.9er/4.10er kernels Michal Hocko <mhocko@kernel.org> - 2017-03-17 18:20 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-17 21:10 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-19 09:20 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-03-20 03:00 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Michal Hocko <mhocko@kernel.org> - 2017-03-19 16:30 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-19 17:10 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Mike Galbraith <efault@gmx.de> - 2017-03-20 04:10 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-21 07:10 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Mike Galbraith <efault@gmx.de> - 2017-03-21 08:20 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-23 08:40 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Mike Galbraith <efault@gmx.de> - 2017-03-23 09:50 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-03-23 15:50 +0100
                Re: Still OOM problems with 4.9er/4.10er kernels Gerhard Wiesinger <lists@wiesinger.com> - 2017-03-26 10:40 +0200

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