linux-kernel - Re: [RFC][PATCH 2/3] memcg:: seq

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Message-Id: <20080521150629.c22cb81e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 21 May 2008 15:06:29 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Paul Menage" <menage@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>
Subject: Re: [RFC][PATCH 2/3] memcg:: seq_ops support for cgroup

On Tue, 20 May 2008 22:06:48 -0700
"Paul Menage" <menage@...gle.com> wrote:

> >
> > And (*read) method isn't useful ;)
> >
> > Can we add new stat file dynamically ?
> 
> Yes, there's no reason we can't do that. Right now it's not possible
> to remove a control file without deleting the cgroup, but I have a
> patch that supports removal.
> 
Good news. I'll wait for.

> The question is whether it's better to have one file per CPU/node or
> one large complex file.
> 
For making the kernel simple, one-file-per-entity(cpu/node...) is better.
For making the applications simple, one big file is better.

I think recent interfaces uses one-file-per-entity method. So I vote for it
for this numastat. One concern is size of cpu/node. It can be 1024...4096 depends
on environment.

open/close 4096 files took some amount of cpu time.
(And that's why 'ps' command is slow on big system.)

Thanks,
-Kame

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