perf report: Print out the total number of events

So that the statistical quality of the profile can be estimated at a glance.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 0 deletions

diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
index 15fe9dae792b..be392e0f77c6 100644
--- a/Documentation/perf_counter/builtin-report.c
+++ b/Documentation/perf_counter/builtin-report.c
@@ -722,6 +722,8 @@ static size_t output__fprintf(FILE *fp, uint64_t total_samples)
         size_t ret = 0;
 
         fprintf(fp, "#\n");
+        fprintf(fp, "# (%Ld profiler events)\n", (__u64)total_samples);
+        fprintf(fp, "#\n");
 
         fprintf(fp, "# Overhead");
         list_for_each_entry(se, &hist_entry__sort_list, list)