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Date:	Sun, 30 Sep 2012 17:25:42 +0900
From:	Tejun Heo <>
To:	Glauber Costa <>
Cc:	Michal Hocko <>,,,,,,
	Suleiman Souhlal <>,
	Frederic Weisbecker <>,
	Mel Gorman <>,
	David Rientjes <>,
	Christoph Lameter <>,
	Pekka Enberg <>,
	Johannes Weiner <>
Subject: Re: [PATCH v3 06/13] memcg: kmem controller infrastructure

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?


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