linux-kernel - Re: Fwd: [RFC][PATCH v1 11/15] perf: export tracepoint events via sysfs: power

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Message-Id: <201007231358.31002.rjw@sisk.pl>
Date:	Fri, 23 Jul 2010 13:58:30 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Robert Richter <robert.richter@....com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Johannes Berg <johannes@...solutions.net>,
	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>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Fwd: [RFC][PATCH v1 11/15] perf: export tracepoint events via sysfs: 
 	power

On Friday, July 23, 2010, Lin Ming wrote:
> 
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > Date: Fri, Jul 23, 2010 at 5:53 AM
> > Subject: Re: [RFC][PATCH v1 11/15] perf: export tracepoint events via
> > sysfs: power
> > 
> > 
> > On Thursday, July 22, 2010, Lin Ming wrote:
> > > power tracepoint events are exported like below,
> > >
> > > /sys/power/events/
> > > |-- power_end
> > > |   |-- config
> > > |   `-- type
> > > |-- power_frequency
> > > |   |-- config
> > > |   `-- type
> > > `-- power_start
> > >     |-- config
> > >     `-- type
> > 
> > Any details?
> 
> Sorry that I didn't include you in the patch description.
> 
> [RFC][PATCH v1 00/15] perf: export events in a structured way via sysfs
> http://lkml.org/lkml/2010/7/22/141

Thanks, I'll have a look at this later today.
 
> > > ---
> > >  kernel/power/main.c |    4 ++++
> > >  1 files changed, 4 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/kernel/power/main.c b/kernel/power/main.c
> > > index b58800b..6749374 100644
> > > --- a/kernel/power/main.c
> > > +++ b/kernel/power/main.c
> > > @@ -12,6 +12,7 @@
> > >  #include <linux/string.h>
> > >  #include <linux/resume-trace.h>
> > >  #include <linux/workqueue.h>
> > > +#include <linux/perf_event.h>
> > >
> > >  #include "power.h"
> > >
> > > @@ -269,6 +270,9 @@ static int __init pm_init(void)
> > >       power_kobj = kobject_create_and_add("power", NULL);
> > >       if (!power_kobj)
> > >               return -ENOMEM;
> > > +
> > > +     perf_sys_add_tp(power_kobj, "power");
> > > +
> > 
> > Why isn't it done in drivers/base/power/sysfs.c ?
> 
> The sysfs thing in drivers/base/power/sysfs.c is per device.
> But the power tracepoint events are not per device, right?

Right, sorry.

Rafael
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