linux-kernel - Re: [RFC][PATCH] Multimedia scheduling class, take 2

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Message-Id: <1242146758.4792.19.camel@Palantir>
Date:	Tue, 12 May 2009 18:45:58 +0200
From:	Raistlin <raistlin@...ux.it>
To:	Jussi Laako <jussi@...arnerd.net>
Cc:	Chris Friesen <cfriesen@...tel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	James Courtier-Dutton <James@...erbug.co.uk>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC][PATCH] Multimedia scheduling class, take 2

On Tue, 2009-05-12 at 19:34 +0300, Jussi Laako wrote:
> Chris Friesen wrote:
> > If all you're trying to do is allow different threads to run at
> > different nice levels, what about extending sys_setpriority() to take a
> > "which" of PRIO_THREAD?  We'd probably have to call the syscall directly
> > until/unless libc picks up the new option.
> 
> How would this be mapped to a POSIX standard API? I would like to see
> something which works straight out with
> pthread_setschedprio()/pthread_getschedparam(). In order it to work
> correctly it also needs sys_sched_get_priority_min and
> sys_sched_get_priority_max.
> 
Well, I'm not sure I can see why, since nor a "SCHED_MM" scheduling
policy, nor having priorities for SCHED_OTHER (different from nice
levels) is _not_ POSIX compliant, is it?

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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