linux-kernel - Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

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Date:	Fri, 19 Nov 2010 06:03:34 -0700
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Menage <menage@...gle.com>,
	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Hans-Peter Jansen <hpj@...la.net>,
	linux-kernel@...r.kernel.org,
	Lennart Poettering <mzxreary@...inter.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>, david@...g.hm,
	Dhaval Giani <dhaval.giani@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Fri, 2010-11-19 at 13:51 +0100, Peter Zijlstra wrote:
> On Fri, 2010-11-19 at 04:31 -0800, Paul Menage wrote:
> > On Fri, Nov 19, 2010 at 3:49 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > > It must be nice to be that ignorant ;-) Speaking for the scheduler
> > > cgroup controller (that being the only one I actually know), most all
> > > the load-balance operations are O(n) in the number of active cgroups,
> > > and a lot of the cpu local schedule operations are O(d) where d is the
> > > depth of the cgroup tree.
> > 
> > The same would apply to CPU autogroups, presumably?
> 
> Yep, they're not special at all... uses the same mechanism.

The only difference is cost of creation and destruction, so cgroups and
autogroups suck boulders of slightly different diameter when creating
and/or destroying at high frequency.

	-Mike


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