From: Peter Zijlstra <peterz@infradead.org>
To: eranian@gmail.com
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
Andi Kleen <andi@firstfloor.org>,
Paul Mackerras <paulus@samba.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
Dan Terpstra <terpstra@eecs.utk.edu>,
Philip Mucci <mucci@eecs.utk.edu>,
Maynard Johnson <mpjohn@us.ibm.com>, Carl Love <cel@us.ibm.com>
Subject: Re: [RFC] perf_events: support for uncore a.k.a. nest units
Date: Thu, 21 Jan 2010 09:59:04 +0100 [thread overview]
Message-ID: <1264064344.4283.1136.camel@laptop> (raw)
In-Reply-To: <7c86c4471001210047v5907f9d8ncecc1f5441afab3a@mail.gmail.com>
On Thu, 2010-01-21 at 09:47 +0100, stephane eranian wrote:
> I don't think that is correct. You can be using the uncore PMU on Nehalem
> without any core PMU event. The only thing to realize is that uncore PMU
> shares the same interrupt vector as core PMU. You need to configure which
> core the uncore is going to interrupt on. This is done via a bitmask, so you
> can interrupt more than one core at a time. Several strategies are possible.
Ah, sharing the IRQ line is no problem. But from reading I got the
impression you need to configure an Offcore counter. See 30.6.2.1:
• EN_PMI_COREn (bit n, n = 0, 3 if four cores are present): When set, processor
core n is programmed to receive an interrupt signal from any interrupt enabled
uncore counter. PMI delivery due to an uncore counter overflow is enabled by
setting IA32_DEBUG_CTL.Offcore_PMI_EN to 1.
Which seems to indicate a link with the off-core response thing.
However I would be very glad to be wrong :-)
next prev parent reply other threads:[~2010-01-21 8:59 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-19 19:41 [RFC] perf_events: support for uncore a.k.a. nest units Corey Ashford
2010-01-20 0:44 ` Andi Kleen
2010-01-20 1:49 ` Corey Ashford
2010-01-20 9:35 ` Andi Kleen
2010-01-20 19:28 ` Corey Ashford
2010-01-20 13:34 ` Peter Zijlstra
2010-01-20 21:33 ` Peter Zijlstra
2010-01-20 23:23 ` Corey Ashford
2010-01-21 7:21 ` Ingo Molnar
2010-01-21 19:13 ` Corey Ashford
2010-01-21 19:28 ` Corey Ashford
2010-01-27 10:28 ` Ingo Molnar
2010-01-27 19:50 ` Corey Ashford
2010-01-28 10:57 ` Peter Zijlstra
2010-01-28 18:00 ` Corey Ashford
2010-01-28 19:06 ` Peter Zijlstra
2010-01-28 19:44 ` Corey Ashford
2010-01-28 22:08 ` Corey Ashford
2010-01-29 9:52 ` Peter Zijlstra
2010-01-29 23:05 ` Corey Ashford
2010-01-30 8:42 ` Peter Zijlstra
2010-02-01 19:39 ` Corey Ashford
2010-02-01 19:54 ` Peter Zijlstra
2010-01-21 8:36 ` Peter Zijlstra
2010-01-21 8:47 ` stephane eranian
2010-01-21 8:59 ` Peter Zijlstra [this message]
2010-01-21 9:16 ` stephane eranian
2010-01-21 9:43 ` stephane eranian
[not found] ` <d3f22a1003290213x7d7904an59d50eb6a8616133@mail.gmail.com>
2010-03-30 7:42 ` Lin Ming
2010-03-30 16:49 ` Corey Ashford
2010-03-30 17:15 ` Peter Zijlstra
2010-03-30 22:12 ` Corey Ashford
2010-03-31 14:01 ` Peter Zijlstra
2010-03-31 14:13 ` stephane eranian
2010-03-31 15:49 ` Maynard Johnson
2010-03-31 17:50 ` Corey Ashford
2010-04-15 21:16 ` Gary.Mohr
2010-04-16 13:24 ` Peter Zijlstra
2010-04-19 9:08 ` Lin Ming
2010-04-19 9:27 ` Peter Zijlstra
2010-04-20 11:55 ` Lin Ming
2010-04-20 12:03 ` Peter Zijlstra
2010-04-21 8:08 ` Lin Ming
2010-04-21 8:32 ` stephane eranian
2010-04-21 8:39 ` Lin Ming
2010-04-21 8:44 ` stephane eranian
2010-04-21 9:42 ` Lin Ming
2010-04-21 9:57 ` Peter Zijlstra
2010-04-21 22:12 ` Lin Ming
2010-04-21 14:22 ` Peter Zijlstra
2010-04-21 22:38 ` Lin Ming
2010-04-21 14:53 ` Peter Zijlstra
2010-03-30 21:28 ` stephane eranian
2010-03-30 23:11 ` Corey Ashford
2010-03-31 13:43 ` stephane eranian
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