linux-kernel - Re: [RFC PATCH] memcg, oom: move out_of

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Message-ID: <20180621073646.GB10465@dhcp22.suse.cz>
Date:   Thu, 21 Jun 2018 09:36:46 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     linux-mm@...ck.org, Greg Thelen <gthelen@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] memcg, oom: move out_of_memory back to the charge
 path

On Wed 20-06-18 15:38:36, Johannes Weiner wrote:
> On Wed, Jun 20, 2018 at 05:31:48PM +0200, Michal Hocko wrote:
> > 	 * Please note that mem_cgroup_oom_synchronize might fail to find a
> > 	 * victim and then we have rely on mem_cgroup_oom_synchronize otherwise
> > 	 * we would fall back to the global oom killer in pagefault_out_of_memory
> 
> I can't quite figure out what this paragraph is trying to
> say. "oom_synchronize might fail [...] and we have to rely on
> oom_synchronize". Hm?

heh, vim autocompletion + a stale comment from the previous
implementation which ENOMEM on the fail path. I went with 

	 * Please note that mem_cgroup_out_of_memory might fail to find a
	 * victim and then we have to bail out from the charge path.

-- 
Michal Hocko
SUSE Labs