Date: Tue, 12 Oct 2010 13:34:02 -0700 From: Garrett Cooper <gcooper@FreeBSD.org> To: Eknath Venkataramani <eknath.iyer@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Scheduler Question Message-ID: <AANLkTim6ExpkWm-tqb2OJgTcSs7m6Q9xVOuzKZT6hdyz@mail.gmail.com> In-Reply-To: <AANLkTi=emW=TZ9-6PQZJQuqU33ErVvvjYX0DfFxCMO-x@mail.gmail.com> References: <AANLkTi=emW=TZ9-6PQZJQuqU33ErVvvjYX0DfFxCMO-x@mail.gmail.com>
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On Sat, Oct 9, 2010 at 4:46 PM, Eknath Venkataramani
<eknath.iyer@gmail.com> wrote:
> D&I of the FreeBSD Operating System says it's gonna refer to the BSD default
> scheduler, the 'time share scheduler' does this mean sched_4BSD.c(In the
> introduction section of Chapter 4) handles only time-share process?
> If so, then how (or where) are the kernel processes/real time process
> scheduled?
The Design and Implementation of the FreeBSD Operating System is
unfortunately extremely out of date (my edition which I think is the
latest one refers to FreeBSD 5.2). The FreeBSD scheduler was switched
over to sched_ule.c as the default scheduler in 7.1.
So I'd invest more time in determining how SCHED_ULE works rather
than SCHED_4BSD going forward (even though learning about SCHED_4BSD
is a good lesson in history of design of FreeBSD).
FWIW the algorithm of prioritization, quantization of time slices,
etc for SCHED_4BSD are discussed more in depth in the chapter.
Cheers,
-Garrett
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