Date: Fri, 19 Nov 2010 00:12:18 +0100
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
To: Hans-Peter Jansen <hpj@urpla.net>
Cc: 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>,
        Mike Galbraith <efault@gmx.de>, 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: <20101118231218.GX6024@const.famille.thibault.fr>
Mail-Followup-To: Samuel Thibault <samuel.thibault@ens-lyon.org>,
	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>,
	Mike Galbraith <efault@gmx.de>, 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: <1289916171.5169.117.camel@maggy.simson.net> <AANLkTimC_TWzKET-aabYK0TPG6fUUW06HDej6iOzYtKo@mail.gmail.com> <20101116211431.GA15211@tango.0pointer.de> <201011182333.48281.hpj@urpla.net>
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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.

Samuel
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