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From: Juli Mallett <jmallett@FreeBSD.org>
Date: Wed, 23 Jun 2010 19:56:46 -0700
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Subject: Re: svn commit: r209490 - head/sys/kern
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On Wed, Jun 23, 2010 at 19:26, M. Warner Losh <imp@bsdimp.com> wrote:

> : > # =A0 =A0define HZ 1000
> : > # =A0else
> : > # =A0 =A0define HZ 100
>
> Shouldn't this be defined in some file in ARCH/include instead?

Didn't it used to be?  I think the problem with doing that is that
then someone inevitably writes code that uses HZ instead of the
(tunable) hz.  Of course, you can hide it behind an obscure #ifdef and
even give it an intimidating name.