From: Michael Buesch <mbuesch@freenet.de>
To: Chris Friesen <cfriesen@nortelnetworks.com>
Subject: Re: Nice 19 process still gets some CPU
Date: Mon, 28 Jun 2004 18:23:59 +0200
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Cc: Con Kolivas <kernel@kolivas.org>, Timothy Miller <miller@techsource.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Quoting Chris Friesen <cfriesen@nortelnetworks.com>:
> Timothy Miller wrote:
> > 
> > 
> > Con Kolivas wrote:
> > 
> >  >
> >  > It definitely should _not_ starve. That is the unixy way of doing
> >  > things. Everything must go forward. Around 5% cpu for nice 19 sounds
> >  > just right. If you want scheduling only when there's spare cpu cycles
> >  > you need a sched batch(idle) implementation.
> >  >
> >  >
> > 
> > Well, since I can't rewrite the app, I can't make it sched batch.  Nice
> > values are an easy thing to get at for anything that's running.
> 
> Sure you can.  You can set the scheduler policy on any process in the system, 
> while its running.
> 
> int sched_setscheduler(pid_t pid, int policy, const struct sched_param *p);
> 
> Takes about two minutes to write an equivalent to "nice" to set scheduler 
> policies and priorities.

Sounds cool. I was searching this syscall for a long time, now. :)
But batch scheduling is available in -ck only, so this works only
with -ck kernels. Correct?

> Chris

- -- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]


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