linux-kernel - [PATCH 0/2] memcg: mm_update_next

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Message-ID: <20140418172631.GA13323@redhat.com>
Date:	Fri, 18 Apr 2014 19:26:31 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Chiang <pchiang@...dia.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Cc:	"ccross@...roid.com" <ccross@...roid.com>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	"tj@...nel.org" <tj@...nel.org>, "pavel@....cz" <pavel@....cz>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"guillaume@...infr.org" <guillaume@...infr.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/2] memcg: mm_update_next_owner() should skip kthreads

On 04/18, Oleg Nesterov wrote:
>
> Hmm. I seem to see a bug in this function, it can be fulled by use_mm,
> but I am not sure this can explain the problem. I'll send a patch.

Untested, please review. But it really looks "obviously wrong", and note
that unuse_mm() doesn't do mm_update_next_owner(). (just in case, do not
confuse it with unuse_mm() in mm/swapfile.c).

Oleg.

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