linux-kernel - Re: [RFC] exponential update_wall

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Message-Id: <20060927150501.3d40e11e.akpm@osdl.org>
Date:	Wed, 27 Sep 2006 15:05:01 -0700
From:	Andrew Morton <akpm@...l.org>
To:	john stultz <johnstul@...ibm.com>
Cc:	Roman Zippel <zippel@...ux-m68k.org>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC] exponential update_wall_time

On Wed, 27 Sep 2006 12:35:33 -0700
john stultz <johnstul@...ibm.com> wrote:

> +	while (offset > clock->cycle_interval << (shift + 1))
> +		shift++;

hurts my brain.  I have a vague feeling that this can be done with
something like ffz(~(offset/clock->cycle_interval))+epsilon, but that hurts
my brain too.

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