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

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Message-ID: <20100519072332.GE9618@elte.hu>
Date:	Wed, 19 May 2010 09:23:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Borislav Petkov <bp@...64.org>, Lin Ming <ming.m.lin@...el.com>,
	Greg KH <greg@...ah.com>,
	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


* Peter Zijlstra <peterz@...radead.org> wrote:

> 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.

Note, this does not preclude Linux from supporting 
assymetric MP, should the need arise: if MP assymetry is 
supported then that can (and should) be expressed in the 
sysfs topology accordingly - and the moment the assymetric 
MP topology is enumerated in sysfs it gives a place for 
the different event_source's to live there as well.

Thanks,

	Ingo
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