linux-kernel - Re: [PATCH v3 06/13] memcg: kmem controller infrastructure

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Message-ID: <20121001094447.GB8622@dhcp22.suse.cz>
Date:	Mon, 1 Oct 2012 11:44:47 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	Glauber Costa <glommer@...allels.com>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	linux-mm@...ck.org, Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 06/13] memcg: kmem controller infrastructure

On Sun 30-09-12 17:25:42, Tejun Heo wrote:
> On Fri, Sep 28, 2012 at 03:34:19PM +0400, Glauber Costa wrote:
> > On 09/27/2012 05:44 PM, Michal Hocko wrote:
> > > Anyway, I have just noticed that __mem_cgroup_try_charge does
> > > VM_BUG_ON(css_is_removed(&memcg->css)) on a given memcg so you should
> > > keep css ref count up as well.
> > 
> > IIRC, css_get will prevent the cgroup directory from being removed.
> > Because some allocations are expected to outlive the cgroup, we
> > specifically don't want that.
> 
> That synchronous ref draining is going away.  Maybe we can do that
> before kmemcg?  Michal, do you have some timeframe on mind?

It is on my todo list but I didn't get to it yet. I am not sure we can
get rid of css_get though - will have to think about that.

> 
> Thanks.
> 
> -- 
> tejun

-- 
Michal Hocko
SUSE Labs
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