linux-kernel - Re: [PATCH] All Transmeta CPUs have constant TSCs

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Date:	Mon, 8 Jan 2007 15:13:07 -0800 (PST)
From:	dean gaudet <dean@...tic.org>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] All Transmeta CPUs have constant TSCs

On Mon, 8 Jan 2007, H. Peter Anvin wrote:

> I *definitely* support the concept that RDPMC 0 should could CPU cycles by
> convention in Linux.

unfortunately that'd be very limiting and annoying on core2 processors 
which have dedicated perf counters for clocks unhalted (actual vs. 
nominal), but only 2 configurable perf counters.  i forget what ecx value 
gets you the dedicated counters... but a solution which might work would 
be a syscall to return the perf counter number...

or we could just merge perfmon ;)

-dean
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