From: Andi Kleen <ak@suse.de>
To: David Gibson <david@gibson.dropbear.id.au>,
Andi Kleen <ak@suse.de>, 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 01:34:33 +0100 [thread overview]
Message-ID: <20051130003433.GA19515@wotan.suse.de> (raw)
In-Reply-To: <20051129235626.GC9659@localhost.localdomain>
On Wed, Nov 30, 2005 at 10:56:26AM +1100, David Gibson wrote:
> On Wed, Nov 30, 2005 at 12:39:20AM +0100, Andi Kleen wrote:
> > > Well, if that's all you want them to use RDPMC 0 for, why not just make
> > > PMCs programmable from userspace?
> >
> > First we need to have a cycle counter PMC anyways for the NMI watchdog.
> > So it can as well be used for other purposes.
>
> But the watchdog doesn't require it to be in the same place on all
> machines. Exporting it turns an internal requirement into an ABI
> point.
Yes, but the only alternative I know of would be to let user space
continue getting broken all the time with RDTSC. RDPMC is a nice
alternative.
-Andi
next prev parent reply other threads:[~2005-11-30 0:34 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-29 15:15 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 [this message]
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
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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