linux-kernel - Re: Page Allocation Failures/OOM with dm-crypt on software RAID10 (Intel Rapid Storage)

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Date:	Thu, 14 Jul 2016 20:18:49 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	Michal Hocko <mhocko@...nel.org>,
	Matthias Dahl <ml_linux-kernel@...ary-island.eu>
Cc:	linux-raid@...r.kernel.org, linux-mm@...ck.org,
	dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	Mike Snitzer <snitzer@...hat.com>
Subject: Re: Page Allocation Failures/OOM with dm-crypt on software RAID10
 (Intel Rapid Storage)

On 2016/07/13 22:47, Michal Hocko wrote:
> On Wed 13-07-16 15:18:11, Matthias Dahl wrote:
>> 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?
> 
> $ git grep "kmem_cache_create.*bio"
> block/bio-integrity.c:  bip_slab = kmem_cache_create("bio_integrity_payload",
> 
> so there doesn't seem to be any cache like that in the vanilla kernel.
> 
It is

  snprintf(bslab->name, sizeof(bslab->name), "bio-%d", entry);

line in bio_find_or_create_slab() in block/bio.c.
I think you can identify who is creating it by printing backtrace at that line.