linux-kernel - Re: [RFC][PATCH 4/6] memcg : swap cgroup

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Message-Id: <20081107101905.268533fb.nishimura@mxp.nes.nec.co.jp>
Date:	Fri, 7 Nov 2008 10:19:05 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"menage@...gle.com" <menage@...gle.com>,
	nishimura@....nes.nec.co.jp
Subject: Re: [RFC][PATCH 4/6] memcg : swap cgroup

On Thu, 6 Nov 2008 21:44:21 +0900 (JST), "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com> wrote:
> Daisuke Nishimura said:
> > On Wed, 5 Nov 2008 17:21:41 +0900, KAMEZAWA Hiroyuki
> > <kamezawa.hiroyu@...fujitsu.com> wrote:
> >> Note1: In this, we use pointer to record information and this means
> >>       8bytes per swap entry. I think we can reduce this when we
> >>       create "id of cgroup" in the range of 0-65535 or 0-255.
> >>
> >> Note2: array of swap_cgroup is allocated from HIGHMEM. maybe good for
> >> x86-32.
> >>
> >> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >>
> >>  include/linux/page_cgroup.h |   35 +++++++
> >>  mm/page_cgroup.c            |  201
> >> ++++++++++++++++++++++++++++++++++++++++++++
> >>  mm/swapfile.c               |    8 +
> >>  3 files changed, 244 insertions(+)
> >>
> > Is there any reason why they are defined not in memcontrol.[ch]
> > but in page_cgroup.[ch]?
> >
> no strong reason. just because this is not core logic for acccounting.
> do you want to see this in memcontrol.c ?
> 
I just felt strange just because they are not "page_cgroup".
I don't have any strong request to move them to memcontrol.c.


Thanks,
Daisuke Nishimura.
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