linux-kernel - Re: [PATCH 10/14] Add /sys trigger for per-node memory compaction

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Message-Id: <20100407101913.58d1855b.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 7 Apr 2010 10:19:13 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 10/14] Add /sys trigger for per-node memory compaction

On Tue, 6 Apr 2010 17:56:01 -0400
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 7 Apr 2010 09:31:48 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> 
> > A cgroup which controls placement of memory is cpuset.
> 
> err, yes, that.
> 
> > One idea is per cpuset. But per-node seems ok.
> 
> Which is superior?
> 
> Which maps best onto the way systems are used (and onto ways in which
> we _intend_ that systems be used)?
> 

node has hugepage interface now.

[root@...extal qemu-kvm-0.12.3]# ls /sys/devices/system/node/node0/hugepages/
hugepages-2048kB

So, per-node knob is straightforward. 

> Is the physical node really the best unit-of-administration?  And is
> direct access to physical nodes the best means by which admins will
> manage things?

In these days, we tend to use "setup tool" for using cpuset, etc.
(as libcgroup.)

Considering control by userland-support-soft, I think pernode is not bad.
And per-cpuset requires users to mount cpuset.
(Now, most of my customer doesn't use cpuset.)


Thanks,
-Kame


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