linux-kernel - Re: [PATCH] perf_counters: start documenting HAVE_PERF

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Message-ID: <4A329322.7030403@oracle.com>
Date:	Fri, 12 Jun 2009 10:40:50 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Mike Frysinger <vapier.adi@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, samr <sam@...nborg.org>
Subject: Re: [PATCH] perf_counters: start documenting HAVE_PERF_COUNTERS 
 requirements

Mike Frysinger wrote:
> On Fri, Jun 12, 2009 at 13:36, Ingo Molnar wrote:
>> * Mike Frysinger <vapier.adi@...il.com> wrote:
>>> On Fri, Jun 12, 2009 at 13:30, Ingo Molnar wrote:
>>>> * Mike Frysinger <vapier@...too.org> wrote:
>>>>> Help out arch porters who want to support perf counters by listing some
>>>>> basic requirements.
>>>>>
>>>>> Signed-off-by: Mike Frysinger <vapier@...too.org>
>>>>> ---
>>>>> i imagine more details would be good, but this is a starting point and
>>>>> better than nothing
>>>>>
>>>>>  init/Kconfig          |    2 ++
>>>>>  tools/perf/design.txt |   15 +++++++++++++++
>>>>>  2 files changed, 17 insertions(+), 0 deletions(-)
>>>>>
>>>>> diff --git a/init/Kconfig b/init/Kconfig
>>>>> index c649657..20f85b1 100644
>>>>> --- a/init/Kconfig
>>>>> +++ b/init/Kconfig
>>>>> @@ -936,6 +936,8 @@ config AIO
>>>>>
>>>>>  config HAVE_PERF_COUNTERS
>>>>>       bool
>>>>> +     help
>>>>> +       See end of tools/perf/design.txt
>>>>>
>>>>>  menu "Performance Counters"
>>>> Applied, thanks Mike! I have made a small change: i changed it from
>>>> help text into a regular comment. We usually use help texts for
>>>> interactive Kconfig options - but this is not one.
>>> yes, but i like the help text because when i use the kconfig
>>> search option, it shows up.  otherwise doing a search for
>>> HAVE_PERF_COUNTERS shows nothing useful.
>> When i did this modification i tried that in 'make menuconfig' and
>> the help didnt show up. Is it only available in certain kconfig
>> methods?

There is no prompt string for it, so it's invisible in menuconfig.
xconfig has View options that can show it.

> hrm, you're right.  not sure what i was thinking of.  sounds like an
> enhancement request though for kconfig.

Could be.  Cc: Sam added.

-- 
~Randy
LPC 2009, Sept. 23-25, Portland, Oregon
http://linuxplumbersconf.org/2009/
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