Date: Fri, 19 Nov 2010 00:43:39 +0100
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
To: Mike Galbraith <efault@gmx.de>
Cc: Hans-Peter Jansen <hpj@urpla.net>, linux-kernel@vger.kernel.org,
        Lennart Poettering <mzxreary@0pointer.de>,
        Linus Torvalds <torvalds@linux-foundation.org>, 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: <20101118234339.GA6024@const.famille.thibault.fr>
Mail-Followup-To: Samuel Thibault <samuel.thibault@ens-lyon.org>,
	Mike Galbraith <efault@gmx.de>, Hans-Peter Jansen <hpj@urpla.net>,
	linux-kernel@vger.kernel.org,
	Lennart Poettering <mzxreary@0pointer.de>,
	Linus Torvalds <torvalds@linux-foundation.org>, 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>
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Mike Galbraith, le Thu 18 Nov 2010 16:35:51 -0700, a ?crit :
> On Fri, 2010-11-19 at 00:12 +0100, Samuel Thibault wrote:
> > Hans-Peter Jansen, le Thu 18 Nov 2010 23:33:46 +0100, a ?crit :
> > > As already mentioned countless times (and some of it was even renamed 
> > > for this very fact): the grouping by tty is just a starter. There are 
> > > plenty of other possibilities to group the scheduling. The hard part is 
> > > to find the right grouping concepts, that are making sense in the 
> > > usability department _and_ are easy enough to be picked up from our 
> > > favorite system and desktop environments. That's where the generic 
> > > cgroup concept seems to be lacking ATM..
> > 
> > Actually, cgroups should probably be completely hierarchical: sessions
> > contain process groups, which contain processes, which contain threads.
> > You could also gather sessions with the same uid.
> 
> Hierarchical is ~tempting, but adds overhead for not much gain.

What overhead? The implementation of cgroups is actually already
hierarchical.

Samuel
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