linux-kernel - Re: [RFC][PATCH v2 06/11] perf: core, export pmus via sysfs

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Message-ID: <1274253427.5605.10131.camel@twins>
Date:	Wed, 19 May 2010 09:17:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	Lin Ming <ming.m.lin@...el.com>, Greg KH <greg@...ah.com>,
	Ingo Molnar <mingo@...e.hu>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <carll@...ibm.com>,
	Kay Sievers <kay.sievers@...y.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH v2 06/11] perf: core, export pmus via sysfs

On Wed, 2010-05-19 at 09:06 +0200, Borislav Petkov wrote:
> 
> have we considered the per-cpu granularity of MCEs here and if yes, how
> to represent that?

Uhm, by opening the MCE event on a particular cpu? Remember that
sys_perf_event_open() has a cpu target.

The thing is, CPUs are assumed symmetric, thus also all MCE events are
symmetric, one CPU cannot generate other MCE than another. So the only
thing that differs is where you want to listen for them.
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