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

To: Jun Sun <>
Subject: Re: [pathch] kernel/sched.c bogon?
From: Ralf Baechle <>
Date: Mon, 10 Mar 2003 13:55:31 +0100
Cc: Kip Walker <>,
In-reply-to: <>; from on Thu, Mar 06, 2003 at 05:40:01PM -0800
Original-recipient: rfc822;
References: <> <>
User-agent: Mutt/
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 ...


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