Date: Fri, 19 Nov 2010 02:23:48 +0100
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
To: Mike Galbraith <efault@gmx.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Hans-Peter Jansen <hpj@urpla.net>, linux-kernel@vger.kernel.org,
        Lennart Poettering <mzxreary@0pointer.de>, david@lang.hm,
        Dhaval Giani <dhaval.giani@gmail.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Vivek Goyal <vgoyal@redhat.com>, Oleg Nesterov <oleg@redhat.com>,
        Markus Trippelsdorf <markus@trippelsdorf.de>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Ingo Molnar <mingo@elte.hu>, Balbir Singh <balbir@linux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups
Message-ID: <20101119012348.GM6024@const.famille.thibault.fr>
Mail-Followup-To: Samuel Thibault <samuel.thibault@ens-lyon.org>,
	Mike Galbraith <efault@gmx.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Hans-Peter Jansen <hpj@urpla.net>, linux-kernel@vger.kernel.org,
	Lennart Poettering <mzxreary@0pointer.de>, david@lang.hm,
	Dhaval Giani <dhaval.giani@gmail.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Vivek Goyal <vgoyal@redhat.com>, Oleg Nesterov <oleg@redhat.com>,
	Markus Trippelsdorf <markus@trippelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Ingo Molnar <mingo@elte.hu>,
	Balbir Singh <balbir@linux.vnet.ibm.com>
References: <20101116211431.GA15211@tango.0pointer.de> <201011182333.48281.hpj@urpla.net> <20101118231218.GX6024@const.famille.thibault.fr> <1290123351.18039.49.camel@maggy.simson.net> <20101118234339.GA6024@const.famille.thibault.fr> <AANLkTimTNxLYGLgnS9TUT_YiMnmDVrqseByGGogj+A4Z@mail.gmail.com> <20101119000204.GE6024@const.famille.thibault.fr> <AANLkTi=n4r9STKsx76t--HbK7EiUWaaPm7tUN2nXtqxA@mail.gmail.com> <20101119005942.GL6024@const.famille.thibault.fr> <1290129157.18039.70.camel@maggy.simson.net>
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Mike Galbraith, le Thu 18 Nov 2010 18:12:37 -0700, a ?crit :
> 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.

Samuel
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