From: Matthias Dahl <ml_linux-kernel@binary-island.eu>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-raid@vger.kernel.org, linux-mm@kvack.org,
dm-devel@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: Page Allocation Failures/OOM with dm-crypt on software RAID10 (Intel Rapid Storage)
Date: Tue, 12 Jul 2016 13:28:12 +0200 [thread overview]
Message-ID: <d9dbe0328e938eb7544fdb2aa8b5a9c7@mail.ud19.udmedia.de> (raw)
In-Reply-To: <20160712095013.GA14591@dhcp22.suse.cz>
Hello Michal...
On 2016-07-12 11:50, Michal Hocko wrote:
> This smells like file pages are stuck in the writeback somewhere and
> the
> anon memory is not reclaimable because you do not have any swap device.
Not having a swap device shouldn't be a problem -- and in this case, it
would cause even more trouble as in disk i/o.
What could cause the file pages to get stuck or stopped from being
written
to the disk? And more importantly, what is so unique/special about the
Intel Rapid Storage that it happens (seemingly) exclusively with that
and not the the normal Linux s/w raid support?
Also, if the pages are not written to disk, shouldn't something error
out or slow dd down? Obviously dd is capable of copying zeros a lot
faster than they could ever be written to disk -- and still, it works
just fine without dm-crypt in-between. It is only when dm-crypt /is/
involved, that the memory gets filled up and things get out of control.
Thanks,
Matthias
--
Dipl.-Inf. (FH) Matthias Dahl | Software Engineer | binary-island.eu
services: custom software [desktop, mobile, web], server administration
next prev parent reply other threads:[~2016-07-12 11:28 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-12 8:27 Page Allocation Failures/OOM with dm-crypt on software RAID10 (Intel Rapid Storage) Matthias Dahl
2016-07-12 9:50 ` Michal Hocko
2016-07-12 11:28 ` Matthias Dahl [this message]
2016-07-12 11:49 ` Michal Hocko
2016-07-12 11:59 ` Michal Hocko
2016-07-12 12:42 ` Matthias Dahl
2016-07-12 14:07 ` Michal Hocko
2016-07-12 14:56 ` Matthias Dahl
2016-07-13 11:21 ` Michal Hocko
2016-07-13 12:18 ` Michal Hocko
2016-07-13 13:18 ` Matthias Dahl
2016-07-13 13:47 ` Michal Hocko
2016-07-13 15:32 ` Matthias Dahl
2016-07-13 16:24 ` [dm-devel] " Ondrej Kozina
2016-07-13 18:24 ` Matthias Dahl
2016-07-14 11:18 ` Tetsuo Handa
2016-07-15 7:11 ` Page Allocation Failures/OOM with dm-crypt on software RAID10 (Intel Rapid Storage) with check/repair/sync Matthias Dahl
2016-07-18 7:24 ` Matthias Dahl
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