linux-kernel - Re: [RFC][PATCH v2 11/11] perf top: demo of how to use the sysfs interface

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Date:	Thu, 20 May 2010 17:21:23 -0700
From:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Lin Ming <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	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>,
	"greg@...ah.com" <greg@...ah.com>,
	Kay Sievers <kay.sievers@...y.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH v2 11/11] perf top: demo of how to use the sysfs
 interface



On 5/20/2010 1:08 PM, Peter Zijlstra wrote:
> On Wed, 2010-05-19 at 18:33 -0700, Corey Ashford wrote:
>>
>> We also need to take into account event "attributes" - other data that
>> is needed to configure a specific event.  For example, think about a
>> memory controller which has a PMU can count events in a particular
>> memory range; we need to be able to supply the memory range somehow, 
> 
> That's that perf_event_attr is for.
> 

I think the issue is that what is stuffed into perf_event_attr's fields should be done in a way that userspace tools can figure out via attribute info which is in exported by the kernel via sysfs (or eventfs, etc.)

- Corey

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