linux-kernel - Re: [PATCH 2/10] lguest: Export symbols for lguest as a module

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Date:	Fri, 9 Feb 2007 14:58:55 +0100
From:	Andi Kleen <ak@....de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	virtualization@...ts.osdl.org,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH 2/10] lguest: Export symbols for lguest as a module

On Fri, Feb 09, 2007 at 11:06:06PM +1100, Rusty Russell wrote:
> On Fri, 2007-02-09 at 10:32 +0100, Andi Kleen wrote:
> > On Friday 09 February 2007 10:15, Rusty Russell wrote:
> > 
> > > tsc_khz:
> > > 	Simplest way of telling the guest how to interpret the TSC
> > > 	counter.
> > 
> > 
> > Are you sure this will work with varying TSC frequencies? 
> 
> I'm actually quite sure it doesn't (there's a FIXME in the lguest code).
> Given the debate over how useful the TSC was, I originally didn't use
> it, but (1) it's simple, and (2) when it doesn't change, it's pretty
> accurate.

But when it changes users become pretty unhappy

> 
> > In general you should get this from cpufreq.
> 
> Hmm, ok, I'll bite: how?  Time is a mystery I've avoided so far 8)

the old x86-64 time.c (before -mm) has a example in #ifdef CONFIG_CPUFREQ


-Andi
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