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Date: Tue, 22 Mar 2011 05:49:49 +1100 (EST)
From: Bruce Evans <brde@optusnet.com.au>
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To: David Malone <dwmalone@maths.tcd.ie>
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Cc: src-committers@FreeBSD.org, John Baldwin <jhb@FreeBSD.org>,
	svn-src-all@FreeBSD.org, Bruce Evans <brde@optusnet.com.au>,
	svn-src-head@FreeBSD.org, Jung-uk Kim <jkim@FreeBSD.org>
Subject: Re: svn commit: r219676 - head/sys/x86/x86
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On Sun, 20 Mar 2011, David Malone wrote:

> On Wed, Mar 16, 2011 at 04:34:10PM +1100, Bruce Evans wrote:
>> Please revert.  I use this for setting timecounters from userland.  The
>> sysctl is not a hack, but the primary user interface for managing the
>> TSC frequency.  The kern.timecounter.tc.TSC.frequency sysctl is
>> secondary, and is readonly anyway, so it cannot be used to manage the
>> TSC frequency or even the timecounter frequency.
>
> Some people have asked me if I can make kern.timecounter.tc.*.frequency
> writeable. I have it on my list of jobs to look at, but haven't had
> a chance yet. Are there any obvious problems with this?

No new ones.  Just the old ones of updating the frequency and all related
variables without races.

Bruce