linux-kernel - Re: [PATCH 2/2] mm, oom: do not enfore OOM killer for __GFP

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Message-ID: <20161206082738.GA18664@dhcp22.suse.cz>
Date:   Tue, 6 Dec 2016 09:27:39 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     akpm@...ux-foundation.org, vbabka@...e.cz, hannes@...xchg.org,
        mgorman@...e.de, rientjes@...gle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm, oom: do not enfore OOM killer for __GFP_NOFAIL
 automatically

On Mon 05-12-16 15:10:09, Michal Hocko wrote:
[...]
> So we are somewhere in the middle between pre-mature and pointless
> system disruption (GFP_NOFS with a lots of metadata or lowmem request)
> where the OOM killer even might not help and potential lockup which is
> inevitable with the current design. Dunno about you but I would rather
> go with the first option. To be honest I really fail to understand your
> line of argumentation. We have this
> 	do {
> 		cond_resched();
> 	} (page = alloc_page(GFP_NOFS));

This should have been while (!(page = alloc_page(GFP_NOFS))) of
course...

-- 
Michal Hocko
SUSE Labs