linux-kernel - Re: [PATCH 2/3] perf x86: Add precise sysfs attribute

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Date:	Wed, 19 Dec 2012 21:34:30 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 2/3] perf x86: Add precise sysfs attribute

On Wed, Dec 19, 2012 at 04:07:21PM +0100, Jiri Olsa wrote:
> Adding sysfs precise attribute for cpu device (/sys/devices/cpu)
> to show the maximum value for perf event precise attribute.
> 
> This will be initialy used for automated precise event perf test
> and could be helpful otherwise. Arnaldo suggested to use this as
> a guide for default adding of precise attribute for HW events.
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  arch/x86/kernel/cpu/perf_event.c | 34 +++++++++++++++++++++++++---------
>  1 file changed, 25 insertions(+), 9 deletions(-)

As you are adding a new sysfs file, you must also document it with an
entry in Documentation/ABI/

thanks,

greg k-h
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