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authorJiri Olsa <jolsa@redhat.com>2017-02-17 18:00:34 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-02-17 17:31:10 -0300
commit0d79f8b93187c771b6971acfaba67f4e2f1e0710 (patch)
tree27c99c7c1efeaabbe39a07ff3183e53dfedc40e7 /tools
parent99e7138eb7897aa0ccc6661173ae2d7e79721e05 (diff)
downloadlinux-0d79f8b93187c771b6971acfaba67f4e2f1e0710.tar.gz
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/Documentation/perf-stat.txt2
-rw-r--r--tools/perf/builtin-stat.c3
2 files changed, 3 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index d96ccd4..aecf2a8 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -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::
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index ca27a8a..9989b03 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -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");