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

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Date:	Wed, 22 Apr 2015 16:08:50 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
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

On Mon, Apr 20, 2015 at 05:38:52PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Apr 20, 2015 at 10:15:39PM +0200, Jiri Olsa escreveu:
> > On Mon, Apr 20, 2015 at 05:09:36PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Sat, Apr 18, 2015 at 10:42:58PM +0200, Jiri Olsa escreveu:
> > > 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?
> > 
> > I'll resend v2 with the update
> > 
> > > 
> > > 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=".
> > 
> > hum, not sure I follow.. could you please explain in more details?
> 
> This would be considered valid:
> 
>     $ ./perf record -e 'cpu/even=0x1/' ls
>     event syntax error: 'cpu/even=0x1/'
>                              \___ unknown term
>     valid terms: "event", "raw".
> 
> "even="  would be recognized as a shorter form of "event=", "evint="
> would be invalid :-)

hum I see.. seem to be touching the bison/flex core part, might not
be that easy I'll think about it.. ;-)

thanks,
jirka
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