linux-kernel - Re: [PATCH] CDROM: replace jiffies busyloop with msleep

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Date:	Wed, 23 May 2007 21:38:13 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Jeff Garzik <jeff@...zik.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH] CDROM: replace jiffies busyloop with msleep

On 05/23/2007 09:34 PM, Alan Cox wrote:

>> driver was snappy in that regard. When I replaced our sleeping loop with a 
>> busy-wait same as the original the snappyness returned and moreover, reading 
>> the TOC from the CD went from something close to a minute to approximately a 
>> second. Thought that minute was just because I was dealing with an old junk 
>> 1-speed drive...
> 
> It happens. If you want to be fairer you can check need_resched in the
> loop so that you still share the CPU fairly with other users.

Thanks for the tip -- I'll do this.

Rene.

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