From: Oliver Neukum <oliver@neukum.org>
To: "Povolotsky, Alexander" <Alexander.Povolotsky@marconi.com>
Subject: Re: Preemption of the OS system call due to expiration of the time-sl ice for: a) SCHED_NORMAL (aka SCHED_OTHER) b) SCHED_RR
Date: Wed, 30 Jun 2004 12:50:04 +0200
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       "'andrebalsa@altern.org'" <andrebalsa@altern.org>,
       "'Richard E. Gooch'" <rgooch@atnf.csiro.au>,
       "'Ingo Molnar'" <mingo@elte.hu>, "'rml@tech9.net'" <rml@tech9.net>,
       "'akpm@osdl.org'" <akpm@osdl.org>, "'Con Kolivas'" <kernel@kolivas.org>
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Am Mittwoch, 30. Juni 2004 11:50 schrieb Povolotsky, Alexander:
> Con - thanks for your kind answers !
> 
> Preemption (due to the expiration of the time-slice) of the process, while
> it executes OS system call, -  by another process (of equal or higher
> priority) when running under following scheduling policies:
> 
>  a) SCHED_NORMAL (aka SCHED_OTHER)
>  b) SCHED_RR 
> 
> Is it possible in Linux 2.6 ? Linux 2.4 ?

It is possible if the kernel is compiled with CONFIG_PREEMPT
and the calling task has not blocked it.

	HTH
		Oliver
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