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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 19 Sep 2016 11:18:26 -0700
Message-ID: <CA+55aFxgzE34D=a5ouRRgW-aca_GSsoVWX5TSOt_2rmJFQShQw@mail.gmail.com>
Subject: Re: More OOM problems
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Sender: owner-linux-mm@kvack.org
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To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <andi@firstfloor.org>, Christoph Lameter <cl@linux.com>, 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 7:41 AM, Vlastimil Babka <vbabka@suse.cz> wrote:
>
> There's no __GFP_NOWARN | __GFP_NORETRY, so it clearly wasn't the
> opportunistic "initial higher-order allocation". The logical conclusion is
> that it was a genuine order-3 allocation. 1kB allocation using order-3 would
> silently fail without OOM or warning, and then fallback to order-0.

Yes, I think you're right. The kcalloc() probably *was* a 32kB
allocation. In which case it's really more of a i915 driver issue.
I'll talk to the drm people and see if they can perhaps fix their
allocation patterns.

               Linus

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