sched debug: BKL usage statistics

add per task and per rq BKL usage statistics.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index d0cc58311b13..920eb7354d0a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -621,6 +621,10 @@ struct sched_info {
         /* timestamps */
         unsigned long long last_arrival,/* when we last ran on a cpu */
                            last_queued; /* when we were last queued to run */
+#ifdef CONFIG_SCHEDSTATS
+        /* BKL stats */
+        unsigned long bkl_cnt;
+#endif
 };
 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */