linux-kernel - Re: [RFC][PATCH 02/22] sched: add extended scheduling interface

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Date:	Wed, 10 Nov 2010 23:45:35 +0100
From:	Raistlin <raistlin@...ux.it>
To:	Dhaval Giani <dhaval.giani@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <luca.abeni@...tn.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 02/22] sched: add extended scheduling interface

On Wed, 2010-11-10 at 17:12 +0100, Dhaval Giani wrote:
> >> + *  @curr_runtime       task's currently available runtime
> >> + *  @used_runtime       task's totally used runtime
> >> + *  @curr_deadline      task's current absolute deadline
> >> + *
> >> + * Given this task model, there are a multiplicity of scheduling algorithms
> >> + * and policies, that can be used to ensure all the tasks will make their
> >> + * timing constraints.
> >> + */
> >> +struct sched_param_ex {
> >> +     int sched_priority;
> >> +     struct timespec sched_runtime;
> >> +     struct timespec sched_deadline;
> >> +     struct timespec sched_period;
> >> +     unsigned int sched_flags;
> >> +
> >> +     struct timespec curr_runtime;
> >> +     struct timespec used_runtime;
> >> +     struct timespec curr_deadline;
> 
> Can we expose soem of these details via schedstats as opposed to a syscall?
> 
Actually, good point... schedstats seems very reasonable to me... What
do the others think?

Thanks,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://blog.linux.it/raistlin / raistlin@...ga.net /
dario.faggioli@...ber.org

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