linux-kernel - Re: [PATCH v3 05/16] consider a memcg parameter in kmem_create

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Message-ID: <50607E0C.7020606@parallels.com>
Date:	Mon, 24 Sep 2012 19:36:44 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Pekka Enberg <penberg@...nel.org>
CC:	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>,
	"<linux-kernel@...r.kernel.org>" <linux-kernel@...r.kernel.org>,
	"<cgroups@...r.kernel.org>" <cgroups@...r.kernel.org>,
	"<kamezawa.hiroyu@...fujitsu.com>" <kamezawa.hiroyu@...fujitsu.com>,
	"<devel@...nvz.org>" <devel@...nvz.org>,
	"<linux-mm@...ck.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>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 05/16] consider a memcg parameter in kmem_create_cache

On 09/24/2012 07:38 PM, Pekka Enberg wrote:
> On 09/24/2012 05:56 PM, Christoph Lameter wrote:
>>> On Mon, 24 Sep 2012, Glauber Costa wrote:
>>>
>>>> The reason I say it is orthogonal, is that people will still want to see
>>>> their caches in /proc/slabinfo, regardless of wherever else they'll be.
>>>> It was a requirement from Pekka in one of the first times I posted this,
>>>> IIRC.
>>>
>>> They want to see total counts there true. But as I said we already have a
>>> duplication of the statistics otherwise. We have never done the scheme
>>> that you propose. That is unexpected. I would not expect the numbers to be
>>> there.
> 
> On Mon, Sep 24, 2012 at 4:57 PM, Glauber Costa <glommer@...allels.com> wrote:
>> I myself personally believe it can potentially clutter slabinfo, and
>> won't put my energy in defending the current implementation. What I
>> don't want is to keep switching between implementations.
>>
>> Pekka, Tejun, what do you guys say here?
> 
> So Christoph is proposing that the new caches appear somewhere under
> the cgroups directory and /proc/slabinfo includes aggregated counts,
> right? I'm certainly OK with that.
> 
Just for clarification, I am not sure about the aggregate counts -
although it surely makes sense.

Christoph, is that what you're proposing ?


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