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

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Date:	Thu, 15 Jan 2009 18:20:45 -0800
From:	Matthew Helsley <matthltc@...ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Paul Menage <menage@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFC][PATCH] NOOP cgroup subsystem

On Fri, 2009-01-09 at 15:32 +0900, KAMEZAWA Hiroyuki wrote:
> 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

	My feeling is this should be a signal subsystem rather than a NOOP
subsystem. Then, if users want the grouping for something besides
signaling, it doesn't matter if they don't issue any signals via the
signal.send file. Also, I think Paul's suggestion would be just as
useful for a signal subsystem.

	What do you think?

Cheers,
	-Matt Helsley

PS: Adding containers@...ts.linux-foundation.org to Cc.

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