perf: Add a timestamp to fork events

perf timechart needs to know when a process forked, in order to be
able to visualize properly when tasks start.

This patch adds a time field to the event structure, and fills it
in appropriately.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20090912130341.51ad2de2@infradead.org>
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 c7375f97aa19..bd341007c4fc 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -336,6 +336,7 @@ enum perf_event_type {
          *      struct perf_event_header        header;
          *      u32                             pid, ppid;
          *      u32                             tid, ptid;
+         *      u64                             time;
          * };
          */
         PERF_EVENT_EXIT                 = 4,
@@ -356,6 +357,7 @@ enum perf_event_type {
          *      struct perf_event_header        header;
          *      u32                             pid, ppid;
          *      u32                             tid, ptid;
+         *      { u64                           time;     } && PERF_SAMPLE_TIME
          * };
          */
         PERF_EVENT_FORK                 = 7,