linux-kernel - Re: [PATCH] lguest-fix-divide-error-implement-sched

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Message-Id: <200706052331.09214.ak@suse.de>
Date:	Tue, 5 Jun 2007 23:31:08 +0200
From:	Andi Kleen <ak@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lguest-fix-divide-error-implement-sched_clock

On Tuesday 05 June 2007 23:15:28 H. Peter Anvin wrote:
> Andi Kleen wrote:
> > 
> > I don't think it's a good idea for the TSC. There are various
> > setups where it is unreliable and also often simulators don't 
> > implement it correctly. And it's always a valuable workaround
> > to be able to turn it off.
> > 
> 
> For all I can tell, if this is the case, then CONFIG_X86_TSC should be
> removed completely.

Yes it should.

> We still support the TSC when CONFIG_X86_TSC is not 
> compiled in; that attribute controls if it is unconditionally required.
> 
> (We seem to still not always use it, which may be a good indication that
> CONFIG_X86_TSC has outlived its usefulness.  Should it be removed?)

Yes.

-Andi
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