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

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Message-ID: <1290133701.18039.105.camel@maggy.simson.net>
Date:	Thu, 18 Nov 2010 19:28:21 -0700
From:	Mike Galbraith <efault@....de>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hans-Peter Jansen <hpj@...la.net>,
	linux-kernel@...r.kernel.org,
	Lennart Poettering <mzxreary@...inter.de>, david@...g.hm,
	Dhaval Giani <dhaval.giani@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 02:23 +0100, Samuel Thibault wrote:
> Mike Galbraith, le Thu 18 Nov 2010 18:12:37 -0700, a écrit :
> > I think that could be done with a fork flag with the same semantics as
> > reset on fork.  Once your task launcher (ala kdeinit) is tagged, it
> > launches task groups, the children lose that ability.
> 
> Mmm, even if always creating groups can have a slight overhead, you
> should probably not prevent userspace from deciding to do so when it
> knows it's appropriate.

I think you may have misunderstood.  The flag would be a hint that
userland can set to say "I want to fork off task groups", just as
SCHED_RESET_ON_FORK asks the kernel to reset a child's sched class and
nice level on fork.

	-Mike

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