linux-kernel - Re: [PATCH v3 02/11] perf: add PMU_FORMAT_RANGE() helper for use by sw-like pmus

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Date:	Wed, 05 Mar 2014 16:05:53 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Michael Ellerman <mpe@...erman.id.au>,
	Linux PPC <linuxppc-dev@...ts.ozlabs.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, scottwood@...escale.com
Subject: Re: [PATCH v3 02/11] perf: add PMU_FORMAT_RANGE() helper for use
 by sw-like pmus

On 03/04/2014 12:09 AM, Cody P Schafer wrote:
> On 03/03/2014 09:19 PM, Michael Ellerman wrote:
>> On Thu, 2014-27-02 at 21:04:55 UTC, Cody P Schafer wrote:
>>> Add PMU_FORMAT_RANGE() and PMU_FORMAT_RANGE_RESERVED() (for reserved
>>> areas) which generate functions to extract the relevent bits from
>>> event->attr.config{,1,2} for use by sw-like pmus where the
>>> 'config{,1,2}' values don't map directly to hardware registers.
>>>
>>> Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
>>> ---
>>>   include/linux/perf_event.h | 17 +++++++++++++++++
>>>   1 file changed, 17 insertions(+)
>>>
>>> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
>>> index e56b07f..3da5081 100644
>>> --- a/include/linux/perf_event.h
>>> +++ b/include/linux/perf_event.h
>>> @@ -871,4 +871,21 @@ _name##_show(struct device
>>> *dev,                    \
>>>                                       \
>>>   static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
>>>
>>> +#define PMU_FORMAT_RANGE(name, attr_var, bit_start, bit_end)        \
>>> +PMU_FORMAT_ATTR(name, #attr_var ":" #bit_start "-" #bit_end);        \
>>> +PMU_FORMAT_RANGE_RESERVED(name, attr_var, bit_start, bit_end)
>>
>> I really think these should have event in the name.
>>
>> Someone looking at the code is going to see event_get_foo() and wonder
>> where
>> that is defined. Grep won't find a definition, tags won't find a
>> definition,
>> the least you can do is have the macro name give some hint.
>>
>
> That is a good point (grep-ability). Let me think about this. There is
> also the possibility that I could adjust the event_get_*() naming to
> something else. format_get_*()? event_get_format_*()? (these names keep
> growing...)
>

I've gone with a format_get(name, event) style macro (making it more 
grep-able), in v4.
Feel free to direct further discussion to the v4 posting.

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