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

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Message-ID: <506063B8.70305@parallels.com>
Date:	Mon, 24 Sep 2012 17:44:24 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	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>,
	Pekka Enberg <penberg@...helsinki.fi>,
	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 05:42 PM, Christoph Lameter wrote:
> On Mon, 24 Sep 2012, Glauber Costa wrote:
> 
>> But that is orthogonal, isn't it? People will still expect to see it in
>> the old slabinfo file.
> 
> The current scheme for memory statistics is
> 
> /proc/meminfo contains global counters
> 
> /sys/devices/system/node/nodeX/meminfo
> 
> contains node specific counters.
> 
> The cgroups directory already contains various files. Adding a slabinfo
> file would make sense and it could be found easily.
> 
> The sysfs hierachy /sys/kernel/slab could also show up there as a "slab"
> directory under which all the details of the various caches would be
> available and tunable. Very much in sync with the way the cgroups
> directories operate.
> 

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.



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