perf stat: Add -n/--null option to run without counters

Allow a no-counters run. This can be useful to measure just
elapsed wall-clock time - or to assess the raw overhead of perf
stat itself, without running any counters.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 1 deletions

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 8420ec589506..cdcd058fac08 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -70,6 +70,7 @@ static int			run_count			=  1;
 static int                      inherit                         =  1;
 static int                      scale                           =  1;
 static int                      target_pid                      = -1;
+static int                      null_run                        =  0;
 
 static int                      fd[MAX_NR_CPUS][MAX_COUNTERS];
 
@@ -461,6 +462,8 @@ static const struct option options[] = {
                     "be more verbose (show counter open errors, etc)"),
         OPT_INTEGER('r', "repeat", &run_count,
                     "repeat command and print average + stddev (max: 100)"),
+        OPT_BOOLEAN('n', "null", &null_run,
+                    "null run - dont start any counters"),
         OPT_END()
 };
 
@@ -476,7 +479,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix)
         if (run_count <= 0 || run_count > MAX_RUN)
                 usage_with_options(stat_usage, options);
 
-        if (!nr_counters)
+        if (!null_run && !nr_counters)
                 nr_counters = 8;
 
         nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);