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

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Date:	Thu, 22 Jul 2010 23:53:48 +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: [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?

> ---
>  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 ?

>  	return sysfs_create_group(power_kobj, &attr_group);
>  }

Rafael
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