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From: Anders Fugmann <afu@fugmann.dhs.org>
To: Linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Q: Scheduler and need_resched
Date: Tue, 24 Sep 2002 11:37:38 +0200	[thread overview]
Message-ID: <3D903262.3020003@fugmann.dhs.org> (raw)
In-Reply-To: 3D9026B6.3080509@fugmann.dhs.org

Anders Fugmann wrote:
> Hi.
> 
> I got a small question of what happens codevice when the quantum of a 
> task is expired (counter == 0 -> need_resched == 1). Of cource schedule 
> is invoked somehow, but from where? How is the "flow". I see from where 
> do_timer is called, and that it schedules a BH, but then I'm stuck.
> 
> Any pointer appriciated.
> Anders Fugmann

Solved.
By the help of the kernel newbies pages, I was pointed to the page 
http://kernelnewbies.org/wiki/moin.cgi/Karthick, which pointed at
the label '_ret_with_reschedule' in entry.S.

This piece of assembler is called after each interrupt, and tests the 
need_resched flag to see is scheduling is nessesary.

Anyway, thanks for your time.
Anders Fugmann



      reply	other threads:[~2002-09-24  9:32 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24  8:47 Q: Scheduler and need_resched Anders Fugmann
2002-09-24  9:37 ` Anders Fugmann [this message]

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