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perf stat: Add -a as default target 

Boris asked for default -a option in case we monitor only uncore events.

While implementing that I thought it might be actually useful to make it
overall default.

Running 'perf stat' will now collect system wide data.

Committer note:

Testing it:

  # perf stat
  ^C
   Performance counter stats for 'system wide':

         3571.559178      cpu-clock (msec)          #    4.000 CPUs utilized
               3,346      context-switches          #    0.937 K/sec
                 277      cpu-migrations            #    0.078 K/sec
              57,271      page-faults               #    0.016 M/sec
       4,535,633,835      cycles                    #    1.270 GHz
       6,389,736,516      instructions              #    1.41  insn per cycle
       1,541,293,875      branches                  #  431.547 M/sec
          14,526,396      branch-misses             #    0.94% of all branches

         0.892950118 seconds time elapsed

  #

Requested-and-Acked-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20170217170034.GB15389@krava
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2017-02-17 18:00:34 +01:00 committed by Arnaldo Carvalho de Melo
parent 99e7138eb7
commit 0d79f8b931
2 changed files with 3 additions and 2 deletions
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2
tools/perf/Documentation/perf-stat.txt
View File

@ -63,7 +63,7 @@ report::
-a::
--all-cpus::
system-wide collection from all CPUs
system-wide collection from all CPUs (default if no target is specified)
-c::
--scale::

3
tools/perf/builtin-stat.c
View File

@ -2445,8 +2445,9 @@ 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;
/* Make system wide (-a) the default target. */
if (!argc && target__none(&target))
usage_with_options(stat_usage, stat_options);
target.system_wide = true;
if (run_count < 0) {
pr_err("Run count must be a positive number\n");