linux-kernel - Re: [RFC][PATCH 0/3] Refactoring sched_entity and sched_rt

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Date:	Tue, 4 Jan 2011 14:37:16 -0200
From:	Lucas De Marchi <lucas.de.marchi@...il.com>
To:	Dario Faggioli <raistlin@...ux.it>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Darren Hart <darren@...art.com>, oleg <oleg@...hat.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>, pjt@...gle.com,
	bharata@...ux.vnet.ibm.co
Subject: Re: [RFC][PATCH 0/3] Refactoring sched_entity and sched_rt_entity.

On Tue, Jan 4, 2011 at 13:55, Dario Faggioli <raistlin@...ux.it> wrote:
> They're not inside an union yet, because I'm not sure on how to treat
> the task group case. In fact, tasks can only have _just_one_ scheduling
> policy at a time, and thus, for example, they need the run_list _or_ the
> rb_node for queueing (if the task is RT or fair, respectively), which is
> perfect with respect to using an union.
> OTOH, groups are always considered both fair _and_ RT entities, for
> example they're always queued in _both_ an RT run_list and a fair
> rb-tree. So I can't put them in an union, because I need both at the
> same time!
> Suggestions on how to deal with that will be appreciated.

Don't forget the PI case too. You will need to change
rt_mutex_setprio() to keep a copy of sched_cfs_entity in struct
rt_mutex_waiter.

Peter, isn't sched_fair_entity a better name?



Lucas De Marchi
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