perf bench: Improve builtin-bench.c for more friendly output

This patch makes output of perf bench more friendly.
Current style of putput, keeping user wait
and printing everything suddenly when we finish,
may confuse users.

So I improved it:

 | % perf bench sched messaging
 | # Running sched/messaging benchmark...  <- printed right after invocation
 | # 20 sender and receiver processes per group
 | # 10 groups == 400 processes run
 |
 |      Total time: 1.476 [sec]

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1257865442-20252-2-git-send-email-mitake@dcl.info.waseda.ac.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index c7505eaff84bb064177676a7e45a609806934d0b..90c39baae0de0bf9fe58c2ddb94caca8f8ab1556 100644 (file)
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -156,6 +156,10 @@ int cmd_bench(int argc, const char **argv, const char *prefix __used)
                        if (strcmp(subsystems[i].suites[j].name, argv[1]))
                                continue;
 
+                       if (bench_format == BENCH_FORMAT_DEFAULT)
+                               printf("# Running %s/%s benchmark...\n",
+                                      subsystems[i].name,
+                                      subsystems[i].suites[j].name);
                        status = subsystems[i].suites[j].fn(argc - 1,
                                                            argv + 1, prefix);
                        goto end;