linux-kernel - Re: [RFC][PATCH] NOOP cgroup subsystem

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Message-Id: <20090109153219.dd8c153d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 9 Jan 2009 15:32:19 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH] NOOP cgroup subsystem

On Thu, 8 Jan 2009 22:26:46 -0800
Paul Menage <menage@...gle.com> wrote:

> On Thu, Jan 8, 2009 at 9:32 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> >
> > Motivation: Simply classify Applications by cgroup
> >  When using cgroup for classifying applications, some kind of "control" or
> >  "account" subsys must be used. For flexible use of cgroup's nature of
> >  classifying applications, NOOP is useful. It can be used regardless of
> >  resource accounting unit or name spaces or some controls.
> >  IOW, NOOP cgroup allows users to tie PIDs with some nickname.
> 
> I agree that the idea is useful. But to me it seems to a bit
> artificial that you still have to mount some kind of subsystem purely
> to get the grouping, and that you can only have one such grouping.
> 
> I think I'd prefer the ability to mount a cgroups hierarchy without
> *any* subsystems (maybe with "-o none"?) which would give you a
> similar effect, but without you needing to know about a special no-op
> subsystem, and would allow you to have multiple "no-op" groupings.
> 

Oh, it seems better idea. Then, we need no configs and no additional subsys.
Thank you for a hint. I'll check how I can do it.

Thanks,
-Kame


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