Date: Thu, 13 Nov 2008 12:22:41 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: balbir@linux.vnet.ibm.com
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org, nishimura@mxp.nes.nec.co.jp,
       Paul Menage <menage@google.com>
Subject: Re: [RFC][PATCH 1/6] memcg: free all at rmdir
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On Thu, 13 Nov 2008 08:44:59 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > On Wed, 12 Nov 2008 16:07:58 -0800
> > Andrew Morton <akpm@linux-foundation.org> wrote:
> >> If we do this then we can make the above "keep" behaviour non-optional,
> >> and the operator gets to choose whether or not to drop the caches
> >> before doing the rmdir.
> >>
> >> Plus, we get a new per-memcg drop_caches capability.  And it's a nicer
> >> interface, and it doesn't have the obvious races which on_rmdir has,
> >> etc.
> >>
> >> hm?
> >>
> > 
> > Balbir, how would you want to do ?
> > 
> > I planned to post shrink_uage patch later (it's easy to be implemented) regardless
> > of acceptance of this patch.
> > 
> > So, I think we should add shrink_usage now and drop this is a way to go.
> 
> I am a bit concerned about dropping stuff at will later. Ubuntu 8.10 has memory
> controller enabled and we exposed memory.force_empty interface there and now
> we've dropped it (bad on our part). I think we should have deprecated it and
> dropped it later.
> 
I *was* documented as "for debug only".

Hmm, adding force_empty again to do "shrink usage to 0" is another choice.

ok?

Thanks,
-Kame

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