From: David Gibson <david@gibson.dropbear.id.au>
To: Andi Kleen <ak@suse.de>
Cc: Nicholas Miell <nmiell@comcast.net>,
Stephane Eranian <eranian@hpl.hp.com>,
Ray Bryant <raybry@mpdtxmail.amd.com>,
discuss@x86-64.org, linux-kernel@vger.kernel.org,
perfctr-devel@lists.sourceforge.net
Subject: Re: [Perfctr-devel] Re: Enabling RDPMC in user space by default
Date: Wed, 30 Nov 2005 10:07:04 +1100 [thread overview]
Message-ID: <20051129230704.GA9659@localhost.localdomain> (raw)
In-Reply-To: <20051129224346.GS19515@wotan.suse.de>
On Tue, Nov 29, 2005 at 11:43:47PM +0100, Andi Kleen wrote:
> > Well, RDPMC isn't defined at all. You're assuming that future processor
> > revisions will have the same or substantially similar PerfCtrs as
> > current processors, and nothing guarantees that at all.
>
> Point, but i guess it is reasonable to assume that future x85 CPUs
> will have cycle counter perfctrs. I cannot imagine anybody dropping
> such a basic facility.
It need not necessarily remain configurable to be in PMC 0 however.
Nor do the the PMC MSRs have to remain fixed..
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
next prev parent reply other threads:[~2005-11-29 23:07 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-29 15:15 Enabling RDPMC in user space by default Andi Kleen
2005-11-29 16:04 ` Mikael Pettersson
2005-11-29 16:17 ` Andi Kleen
2005-11-29 16:56 ` Ray Bryant
2005-11-29 16:15 ` Andi Kleen
2005-11-29 18:09 ` [Perfctr-devel] " Stephane Eranian
2005-11-29 18:13 ` Andi Kleen
2005-11-29 18:29 ` John Reiser
2005-11-29 18:38 ` Andi Kleen
2005-11-29 19:05 ` Lee Revell
2005-11-29 21:43 ` Nicholas Miell
2005-11-29 21:52 ` Andi Kleen
2005-11-29 22:19 ` Stephane Eranian
2005-11-29 22:51 ` [discuss] " Andi Kleen
2005-11-30 16:01 ` Stephane Eranian
2005-11-30 16:23 ` Andi Kleen
2005-12-01 23:41 ` Stephane Eranian
2005-12-02 0:07 ` Andi Kleen
2005-12-02 7:09 ` Stephane Eranian
2005-12-02 11:36 ` Andi Kleen
2005-11-29 22:33 ` Nicholas Miell
2005-11-29 22:43 ` Andi Kleen
2005-11-29 23:02 ` Nicholas Miell
2005-11-29 23:17 ` Andi Kleen
2005-11-29 23:29 ` Nicholas Miell
2005-11-29 23:39 ` Andi Kleen
2005-11-29 23:56 ` David Gibson
2005-11-30 0:34 ` Andi Kleen
2005-11-30 0:52 ` David Gibson
2005-11-30 1:04 ` [discuss] " Andi Kleen
2005-11-30 0:50 ` Ray Bryant
2005-11-30 0:38 ` Andi Kleen
2005-11-30 7:38 ` Stephane Eranian
2005-11-30 8:22 ` Nicholas Miell
2005-11-30 15:48 ` Stephane Eranian
2005-11-29 23:07 ` David Gibson [this message]
2005-11-29 23:18 ` [discuss] " Andi Kleen
2005-11-29 23:28 ` Bernd Schmidt
2005-11-29 23:46 ` [discuss] " Andi Kleen
2005-11-30 2:39 ` Zwane Mwaikambo
2005-11-30 3:38 ` Andi Kleen
2005-12-01 4:08 ` Zwane Mwaikambo
2005-12-01 13:05 ` Andi Kleen
2005-12-01 17:01 ` Zwane Mwaikambo
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