linux-kernel - Re: [PATCH v2 2/3] mm: memcontrol: fix memcg id ref counter on swap charge move

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Message-ID: <20160802172250.GB6637@cmpxchg.org>
Date:	Tue, 2 Aug 2016 13:22:50 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, stable@...r.kernel.org,
	Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] mm: memcontrol: fix memcg id ref counter on swap
 charge move

On Tue, Aug 02, 2016 at 06:00:49PM +0300, Vladimir Davydov wrote:
> Since commit 73f576c04b941 swap entries do not pin memcg->css.refcnt
> directly. Instead, they pin memcg->id.ref. So we should adjust the
> reference counters accordingly when moving swap charges between cgroups.
> 
> Fixes: 73f576c04b941 ("mm: memcontrol: fix cgroup creation failure after many small jobs")
> Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Cc: <stable@...r.kernel.org>	[3.19+]

Acked-by: Johannes Weiner <hannes@...xchg.org>