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| author | Anton Blanchard <anton@samba.org> | 2009-10-18 11:29:23 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-10-19 07:20:21 (GMT) |
| commit | 11018201b831e19304c0d639f105ad6c27e120b1 (patch) | |
| tree | 531051de316cdf54b8193d11fb843d7432419d2c | |
| parent | f39cdf25bf77219676ec5360980ac40b1a7e144a (diff) | |
| download | linux-11018201b831e19304c0d639f105ad6c27e120b1.tar.xz | |
perf stat: Add branch performance metric
When we count both branches and branch-misses it is useful to
print out the percentage of branch-misses:
# perf stat -e branches -e branch-misses /bin/true
Performance counter stats for '/bin/true':
401684 branches # 0.000 M/sec
23301 branch-misses # 5.801 %
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: paulus@samba.org
Cc: a.p.zijlstra@chello.nl
LKML-Reference: <20091018112923.GQ4808@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | tools/perf/builtin-stat.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 3db31e7..c373683 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -125,6 +125,7 @@ struct stats event_res_stats[MAX_COUNTERS][3]; struct stats runtime_nsecs_stats; struct stats walltime_nsecs_stats; struct stats runtime_cycles_stats; +struct stats runtime_branches_stats; #define MATCH_EVENT(t, c, counter) \ (attrs[counter].type == PERF_TYPE_##t && \ @@ -235,6 +236,8 @@ static void read_counter(int counter) update_stats(&runtime_nsecs_stats, count[0]); if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter)) update_stats(&runtime_cycles_stats, count[0]); + if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter)) + update_stats(&runtime_branches_stats, count[0]); } static int run_perf_stat(int argc __used, const char **argv) @@ -352,6 +355,14 @@ static void abs_printout(int counter, double avg) ratio = avg / total; fprintf(stderr, " # %10.3f IPC ", ratio); + } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter)) { + total = avg_stats(&runtime_branches_stats); + + if (total) + ratio = avg * 100 / total; + + fprintf(stderr, " # %10.3f %% ", ratio); + } else { total = avg_stats(&runtime_nsecs_stats); |