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

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Message-Id: <1171022766.2718.94.camel@localhost.localdomain>
Date:	Fri, 09 Feb 2007 23:06:06 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andi Kleen <ak@....de>
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, 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.

> In general you should get this from cpufreq.

Hmm, ok, I'll bite: how?  Time is a mystery I've avoided so far 8)

Thanks!
Rusty.


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