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Date: Fri, 12 Feb 2016 16:50:58 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Wang Nan <wangnan0@huawei.com>, Alexei Starovoitov <ast@kernel.org>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Brendan Gregg <brendan.d.gregg@gmail.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Cody P Schafer <dev@codyps.com>,
        "David S. Miller" <davem@davemloft.net>, He Kuang <hekuang@huawei.com>,
        =?iso-8859-1?Q?J=E9r=E9mie?= Galarneau 
	<jeremie.galarneau@efficios.com>,
        Jiri Olsa <jolsa@kernel.org>, Kirill Smelkov <kirr@nexedi.com>,
        Li Zefan <lizefan@huawei.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, pi3orama@163.com,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/54] perf stat: Forbid user passing improper config
 terms
Message-ID: <20160212155058.GA14891@krava.redhat.com>
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 <20160212134908.GD16190@krava.redhat.com>
 <20160212154517.GB2663@redhat.com>
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On Fri, Feb 12, 2016 at 01:45:17PM -0200, Arnaldo Carvalho de Melo wrote:
> Em Fri, Feb 12, 2016 at 02:49:08PM +0100, Jiri Olsa escreveu:
> > On Fri, Feb 05, 2016 at 02:01:35PM +0000, Wang Nan wrote:
> > > 'perf stat' accepts some config terms but doesn't apply them. For
> > > example:
> > > 
> > >  # perf stat -e 'instructions/no-inherit/' -e 'instructions/inherit/' bash
> > >  # ls
> > >  # exit
> > > 
> > >  Performance counter stats for 'bash':
> > > 
> > >          266258061      instructions/no-inherit/
> > >          266258061      instructions/inherit/
> > 
> > hum, but we support no-/inherit in stat, it'd be better to
> > implement this one for stat IMO
> > 
> > 
> > > 
> > >        1.402183915 seconds time elapsed
> > > 
> > > The result is confusing, because user may expect the first
> > > 'instructions' event exclude the 'ls' command.
> > > 
> > > This patch forbit most of those config terms for 'perf stat'.
> > > 
> > > Result:
> > > 
> > >  # ./perf stat -e 'instructions/no-inherit/' -e 'instructions/inherit/' bash
> > >  event syntax error: 'instructions/no-inherit/'
> > >                       \___ Don't use record mode only config terms
> > 
> > and there's bunch of others which are sampling related:
> >   PARSE_EVENTS__TERM_TYPE_SAMPLE_*
> >   PERF_EVSEL__CONFIG_TERM_CALLGRAPH
> >   PERF_EVSEL__CONFIG_TERM_STACK_USER
> >   ...
> > 
> > probably all from get_config_terms apart from the 'inherot' ones,
> > which should end up with the error message, which could be more
> > user friendly like:
> > 
> >   - Can't use stack-size term in stat event.
> 
> 'stat' event? If this is the term you want to use maybe:
> 
>     'stack-size' is not usable in 'perf stat'.

ok I vote for this one then ^^^ ;-)

jirka