perf_counter: Add PERF_SAMPLE_PERIOD

In order to allow easy tracking of the period, also provide means of
adding it to the sample data.

Signed-off-by: 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, 2 insertions, 0 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 9cea32a0655d..6bc250039738 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -106,6 +106,7 @@ enum perf_counter_sample_format {
         PERF_SAMPLE_CALLCHAIN           = 1U << 5,
         PERF_SAMPLE_ID                  = 1U << 6,
         PERF_SAMPLE_CPU                 = 1U << 7,
+        PERF_SAMPLE_PERIOD              = 1U << 8,
 };
 
 /*
@@ -260,6 +261,7 @@ enum perf_event_type {
          * struct {
          *      struct perf_event_header        header;
          *      u64                             time;
+         *      u64                             id;
          *      u64                             sample_period;
          * };
          */