linux-kernel - Re: [RFC][PATCH v1 06/15] perf: export tracepoint events via sysfs: iwlwifi and iwlwifi

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Date:	Thu, 22 Jul 2010 23:57:34 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Dave Chinner <david@...morbit.com>, Ingo Molnar <mingo@...e.hu>,
	Johannes Berg <johannes@...solutions.net>,
	"Chatre, Reinette" <reinette.chatre@...el.com>,
	Robert Richter <robert.richter@....com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg KH <greg@...ah.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>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH v1 06/15] perf: export tracepoint events via
 sysfs: iwlwifi and iwlwifi_io

On Fri, 2010-07-23 at 10:45 +0800, Lin Ming wrote:
> On Fri, 2010-07-23 at 10:14 +0800, Steven Rostedt wrote:

> Does this "TRACE_CATEGORY()" can help to specify different event
> attribute value?
> 
> /sys/devices/pci0000:00/0000:00:02.0/drm/card0/events
> |-- i915_gem_object_bind
> |   |-- config
> |   |-- type
> |   |-- filter  ==> filter for card0
> 
> /sys/devices/pci0000:00/0000:00:02.0/drm/card1/events
> |-- i915_gem_object_bind
> |   |-- config
> |   |-- type
> |   |-- filter  ==> filter for card1
> 
> In above example, the values of "config" and "type" are same.
> But the values of "filter" are different.

No, it does not make a single event with different atts. It is just a
way to group events.

What you are showing is two events with the same name under two
different groups. But there still only exists one event (the place that
trace_i915_gem_object_bind() is located).

-- Steve


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