linux-kernel - [RFC 1/12][PATCH] Extended scheduling parameters structure added.

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Message-Id: <1255707535.6228.451.camel@Palantir>
Date:	Fri, 16 Oct 2009 17:38:55 +0200
From:	Raistlin <raistlin@...ux.it>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	michael trimarchi <michael@...dence.eu.com>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	Chris Friesen <cfriesen@...tel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Henrik Austad <henrik@...tad.us>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Sven-Thorsten Dietrich <sven@...bigcorporation.com>,
	Bjoern Brandenburg <bbb@...unc.edu>,
	Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
	"giuseppe.lipari" <giuseppe.lipari@...up.it>,
	Juri Lelli <juri.lelli@...il.com>
Subject: [RFC 1/12][PATCH] Extended scheduling parameters structure added.

An extended scheduling parameter structure, sched_param_ex, is defined in
this commit, as the starting point for supporting task models more
sophisticated than fixed-priority.

One that is both popular and (hopefully!) general enough is the so-called
sporadic task model, in which tasks' computation is divided into instances,
each one with:
 * a (maximum/typical) execution time,
 * a minimum interval between the activation of two consecutive instances,
 * a time instant by which the computation of the instance must be completed.

The new sched_param_ex reflects this model, and thus allows for better
specification of time sensitive workloads typical, for example, in real-time,
control and/or continuous media applications.

Signed-off-by: Raistlin <raistlin@...ux.it>
---
 include/linux/sched.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 75e6e60..ac9837c 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -94,6 +94,14 @@ struct sched_param {
 
 #include <asm/processor.h>
 
+struct sched_param_ex {
+	int sched_priority;
+	struct timespec sched_runtime;
+	struct timespec sched_deadline;
+	struct timespec sched_period;
+	int sched_flags;
+};
+
 struct exec_domain;
 struct futex_pi_state;
 struct robust_list_head;
-- 
1.6.0.4

-- 
<<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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