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

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Message-ID: <20070523203436.01a005b0@the-village.bc.nu>
Date:	Wed, 23 May 2007 20:34:36 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Rene Herman <rene.herman@...il.com>
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

> 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.

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