linux-kernel - Re: [RFC 0/6] perf tools: Report event parsing errors

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Date:	Mon, 20 Apr 2015 17:09:36 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [RFC 0/6] perf tools: Report event parsing errors

Em Sat, Apr 18, 2015 at 10:42:58PM +0200, Jiri Olsa escreveu:
> On Sat, Apr 18, 2015 at 07:39:27PM +0200, Ingo Molnar wrote:
> > So since we now know exactly what's going on, we might want to drop 
> > the 'invalid or unsupported event' language as well, and make it 
> > specific:
> > 
> >    $ ./perf record -e 'cpu/even=0x1/' ls
> >    event syntax error: 'cpu/even=0x1/'
> >                             \___ unknown term
> >  
> > 
> > ?
> 
> ok
> 
> > 
> > Also, for the above error, could we easily list the valid terms? An 
> > error like:
> > 
> >    $ ./perf record -e 'cpu/even=0x1/' ls
> >    event syntax error: 'cpu/even=0x1/'
> >                             \___ unknown term
> >    valid terms: "event", "raw".
> > 
> > or so?
> 
> we already carry list of all terms for given pmu,
> so it shouldn't be a problem

So, do you want me to apply this series and you work on top of it or
should I wait for another that implements what Ingo suggested?

Also, we have:

[root@zoo ~]# perf stat --all -e cycles usleep 1

 Performance counter stats for 'system wide':

         3,382,595      cycles                                                      

       0.001739102 seconds time elapsed

[root@zoo ~]# perf stat --all-cpus -e cycles usleep 1

 Performance counter stats for 'system wide':

         2,435,672      cycles                                                      

       0.001191689 seconds time elapsed

[root@zoo ~]# perf stat --a -e cycles usleep 1
  Error: Ambiguous option: a (could be --no-no-aggr or --append)

 usage: perf stat [<options>] [<command>]

[root@zoo ~]#

Which is nice, wouldn't it be good to have it for the that as well, i.e.
for your example "ev=" would be a valid, and shorter form of "even=" or
"event=".

- Arnaldo
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