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From: "H. Peter Anvin" <hpa@zytor.com>
To: dean gaudet <dean@arctic.org>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>,
	akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] All Transmeta CPUs have constant TSCs
Date: Mon, 08 Jan 2007 15:54:48 -0800	[thread overview]
Message-ID: <45A2D9C8.9020007@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0701081506330.12282@twinlark.arctic.org>

dean gaudet wrote:
> 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 ;)
> 

OK, if there are dedicated counters in hardware at a different number, 
we probably should make it an ELF entry value (no need to make it a 
syscall for a constant.)

	-hpa

      reply	other threads:[~2007-01-08 23:55 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-05  1:48 H. Peter Anvin
2007-01-05 14:25 ` Jan Engelhardt
2007-01-08  8:02   ` dean gaudet
2007-01-08 20:19     ` Jan Engelhardt
2007-01-08 20:51       ` Chris Friesen
2007-01-08 20:51       ` H. Peter Anvin
2007-01-08 23:13         ` dean gaudet
2007-01-08 23:54           ` H. Peter Anvin [this message]

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