* Arnaldo Carvalho de Melo <[email protected]> wrote:
> 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>
Btw., would anyone be interested in adding CPU and node binding options to
perf stat?
There's code to do something like that in tools/perf/bench/numa.c:
/* Special option string parsing callbacks: */
OPT_CALLBACK('C', "cpus", NULL, "cpu[,cpu2,...cpuN]",
"bind the first N tasks to these specific cpus (the
rest is unbound)",
parse_cpus_opt),
OPT_CALLBACK('M', "memnodes", NULL, "node[,node2,...nodeN]",
"bind the first N tasks to these specific memory nodes
(the rest is unbound)",
parse_nodes_opt),
Thanks,
Ingo
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