linux-kernel - Re: [PATCH] msleep() with hrtimers

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Date:	Thu, 9 Aug 2007 20:31:28 +0100
From:	"Denis Vlasenko" <vda.linux@...glemail.com>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	"Roman Zippel" <zippel@...ux-m68k.org>,
	"Jonathan Corbet" <corbet@....net>, linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>, akpm@...ux-foundation.org,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: [PATCH] msleep() with hrtimers

On 8/8/07, Arjan van de Ven <arjan@...radead.org> wrote:
> You keep claiming that hrtimers are so incredibly expensive; but for
> msleep()... which is mostly called during driver init ... I really don't
> buy that it's really expensive. We're not doing this a gazilion times
> per second obviously...

Yes. Optimizing delay or sleep functions for speed is a contradiction
of terms. IIRC we still optimize udelay for speed, not code size...
Read it again folks:

        We optimize udelay for speed

How fast your udelay do you want to be today?

Oh well.
--
vda
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