linux-kernel - Re: [PATCH -mm] memcg: remove activate_kmem

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Message-ID: <20141021063119.GM16496@esperanza>
Date:	Tue, 21 Oct 2014 10:31:19 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] memcg: remove activate_kmem_mutex

On Mon, Oct 20, 2014 at 08:53:06PM +0200, Michal Hocko wrote:
> On Mon 20-10-14 19:11:29, Vladimir Davydov wrote:
> > The activate_kmem_mutex is used to serialize memcg.kmem.limit updates,
> > but we already serialize them with memcg_limit_mutex so let's remove the
> > former.
> > 
> > Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
> 
> Is this the case since bd67314586a3 (memcg, slab: simplify
> synchronization scheme)?

No, it's since Johannes' lockless page counters patch where we have the
memcg_limit_mutex introduced to synchronize concurrent limit updates (mm
commit dc1815408849 "mm: memcontrol: lockless page counters").

Thanks,
Vladimir

> Anyway Looks good to me.
> Acked-by: Michal Hocko <mhocko@...e.cz>
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