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Re: [pathch] kernel/sched.c bogon?

To: Jun Sun <jsun@mvista.com>
Subject: Re: [pathch] kernel/sched.c bogon?
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 10 Mar 2003 13:55:31 +0100
Cc: Kip Walker <kwalker@broadcom.com>, linux-mips@linux-mips.org
In-reply-to: <20030306174001.K26071@mvista.com>; from jsun@mvista.com on Thu, Mar 06, 2003 at 05:40:01PM -0800
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <3E67EF64.152CFC6C@broadcom.com> <20030306174001.K26071@mvista.com>
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On Thu, Mar 06, 2003 at 05:40:01PM -0800, Jun Sun wrote:

> I reported this bug last May.  Apparently it is still not
> taken up-stream.   Ralf, why don't we fix it here and push
> it up from you?
> 
> BTW, this bug actually has effect on real-time performance under
> preemptible kernel.

< = 2.4.x preemptible kernel is OPP.

>  It can delay the execution of the highest
> priority real-time process from execution up to 1 jiffy.

Quite a number of users get_cycles() in the kernel assume it to return a
64-bit number.  I guess we'll have to fake a 64-bit counter in software ...

  Ralf

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