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

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Message-ID: <4A329631.3030105@oracle.com>
Date:	Fri, 12 Jun 2009 10:53:53 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	Mike Frysinger <vapier.adi@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf_counters: start documenting HAVE_PERF_COUNTERS requirements

Sam Ravnborg wrote:
> On Fri, Jun 12, 2009 at 10:40:50AM -0700, Randy Dunlap wrote:
>> 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.
> 
> We do not want to show the invisible symbols.

usually, yes.  But it can be very helpful to developers.
I use xconfig showing all symbols All Of The Time
(when not using menuconfig, that is).

> But the added help text is still fine as it is there when you
> grep the Kconfig file.


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