linux-kernel - Re: [PATCH 07/10] perf, tool: Add support to specify hw event as pmu event term

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Date:	Fri, 6 Jul 2012 03:08:39 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] perf, tool: Add support to specify hw event as pmu
 event term

On Wed, Jul 4, 2012 at 2:13 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Wed, 2012-07-04 at 14:00 +0200, Jiri Olsa wrote:
>> On Wed, Jul 04, 2012 at 12:39:20PM +0200, Peter Zijlstra wrote:
>> > On Wed, 2012-07-04 at 00:00 +0200, Jiri Olsa wrote:
>> > >
>> > > It's possible to use sysfs attribute name as 'event' term value,
>> > > or any possible alias for hw event, e.g.:
>> > >   cycles                     OR cpu-cycles
>> > >   branch_misses              OR branch-misses
>> > >   bus_cycles                 OR bus-cycles
>> > >   cache_misses               OR cache-misses
>> > >   cache_references           OR cache-references
>> > >   ref_cycles                 OR ref-cycles
>> > >   stalled_cycles_backend     OR stalled-cycles-backend
>> > >   stalled_cycles_frontend    OR stalled-cycles-frontend
>> >
>> > Do we really want to do that?
>>
>> well, the aliasing works on sysfs filename base.. so when you specify
>>    event=str
>>
>> 'str' file is looked up in 'events' dir.
>
> Right..
>
>> We use '_' in file names and '-' in event symbol names. I thought it might be
>> confusing allowing just '_' so I added also the '-' version.
>>
What's wrong with keeping the - in the filenames as well? That would help
keep things simple. That would avoid yet another layer of aliases.


>> I could keep just the '-' version.. with some more work on kernel ATTR
>> function names ;) but it seems like common sysfs practise to use '_'.
>
> We could map '-' to '_', but I'm not sure about the aliases in general.
> I mean if the sysfs event name is 'cycles' also allowing 'cpu_cycles' is
> somewhat confusing and arbitrary.
>
> I think it would be best to stick to discoverable names only. Anybody?
>
>
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