linux-kernel - Re: [PATCH 2/3] perf stat: Don't require a workload when using system wide or CPU options

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Date:	Tue, 8 Oct 2013 09:39:28 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf stat: Don't require a workload when using
 system wide or CPU options

Em Mon, Sep 30, 2013 at 07:40:12AM -0600, David Ahern escreveu:
> On 9/30/13 2:47 AM, Namhyung Kim wrote:
> >>@@ -1517,8 +1517,10 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
> >>  	} else if (big_num_opt == 0) /* User passed --no-big-num */
> >>  		big_num = false;
> >>
> >>-	if (!argc && !perf_target__has_task(&target))
> >>+	if (!argc && !perf_target__has_task(&target) &&
> >>+	    !perf_target__has_cpu(&target))
> >
> >You can use perf_target__none() for this.
> 
> Indeed. Updated patch attached.

Cool patch, applying to acme/perf/core.

While trying it noticed this, that should also be fixed
eventually:

[root@zoo ~]# perf stat -c C 0
C: No such file or directory

 Performance counter stats for 'C 0':

     <not counted> task-clock              
     <not counted> context-switches        
     <not counted> cpu-migrations 
<SNIP>

- Arnaldo
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