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Date: Mon, 19 Sep 2016 07:31:06 -0700
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: More OOM problems
Message-ID: <20160919143106.GX5871@two.firstfloor.org>
References: <CA+55aFwu30Yz52yW+MRHt_JgpqZkq4DHdWR-pX4+gO_OK7agCQ@mail.gmail.com>
 <214a6307-3bcf-38e1-7984-48cc9f838a48@suse.cz>
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To: Christoph Lameter <cl@linux.com>
Cc: Andi Kleen <andi@firstfloor.org>, Vlastimil Babka <vbabka@suse.cz>, Linus Torvalds <torvalds@linux-foundation.org>, Michal Hocko <mhocko@kernel.org>, Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>, Oleg Nesterov <oleg@redhat.com>, Vladimir Davydov <vdavydov@parallels.com>, Andrew Morton <akpm@linux-foundation.org>, Markus Trippelsdorf <markus@trippelsdorf.de>, Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>, Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>, Jiri Slaby <jslaby@suse.com>, Olaf Hering <olaf@aepfle.de>, Joonsoo Kim <js1304@gmail.com>, linux-mm <linux-mm@kvack.org>

On Mon, Sep 19, 2016 at 08:37:36AM -0500, Christoph Lameter wrote:
> On Sun, 18 Sep 2016, Andi Kleen wrote:
> 
> > > Sounds like SLUB. SLAB would use order-0 as long as things fit. I would
> > > hope for SLUB to fallback to order-0 (or order-1 for 8kB) instead of
> > > OOM, though. Guess not...
> >
> > It's already trying to do that, perhaps just some flags need to be
> > changed?
> 
> SLUB tries order-N and falls back to order 0 on failure.

Right it tries, but Linus apparently got an OOM in the order-N
allocation. So somehow the flag combination that it passes first
is not preventing the OOM killer.

-Andi

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