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,
Mike Snitzer <snitzer@redhat.com>
Subject: Re: Page Allocation Failures/OOM with dm-crypt on software RAID10 (Intel Rapid Storage)
Date: Wed, 13 Jul 2016 15:18:11 +0200 [thread overview]
Message-ID: <74b9325c37948cf2b460bd759cff23dd@mail.ud19.udmedia.de> (raw)
In-Reply-To: <20160713121828.GI28723@dhcp22.suse.cz>
Hello Michal,
many thanks for all your time and help on this issue. It is very much
appreciated and I hope we can track this down somehow.
On 2016-07-13 14:18, Michal Hocko wrote:
> So it seems we are accumulating bios and 256B objects. Buffer heads as
> well but so much. Having over 4G worth of bios sounds really
> suspicious.
> Note that they pin pages to be written so this might be consuming the
> rest of the unaccounted memory! So the main question is why those bios
> do not get dispatched or finished.
Ok. It is the Block IOs that do not get completed. I do get it right
that those bio-3 are already the encrypted data that should be written
out but do not for some reason? I tried to figure this out myself but
couldn't find anything -- what does the number "-3" state? It is the
position in some chain or has it a different meaning?
Do you think a trace like you mentioned would help shed some more light
on this? Or would you recommend something else?
I have also cc' Mike Snitzer who commented on this issue before, maybe
he can see some pattern here as well. Pity that Neil Brown is no longer
available as I think this is also somehow related to it being a Intel
Rapid Storage RAID10... since it is the only way I can reproduce it. :(
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:[~2016-07-13 13:18 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
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 [this message]
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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