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

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Message-ID: <20141021064935.GA9415@dhcp22.suse.cz>
Date:	Tue, 21 Oct 2014 08:49:35 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Vladimir Davydov <vdavydov@...allels.com>
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 Tue 21-10-14 10:31:19, Vladimir Davydov wrote:
> 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").

Ahh, ok. Thanks for the clarification.

-- 
Michal Hocko
SUSE Labs
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