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/kernel/sched_debug.c b/kernel/sched_debug.c
index 57ee9d5630a8..823b63a3a3e1 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -136,6 +136,8 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
                         SPLIT_NS(spread0));
         SEQ_printf(m, "  .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
         SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
+        SEQ_printf(m, "  .%-30s: %ld\n", "bkl_cnt",
+                        rq->bkl_cnt);
 }
 
 static void print_cpu(struct seq_file *m, int cpu)
@@ -323,6 +325,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
         PN(se.exec_max);
         PN(se.slice_max);
         PN(se.wait_max);
+        P(sched_info.bkl_cnt);
 #endif
         SEQ_printf(m, "%-25s:%20Ld\n",
                    "nr_switches", (long long)(p->nvcsw + p->nivcsw));
@@ -350,6 +353,7 @@ void proc_sched_set_task(struct task_struct *p)
         p->se.exec_max                  = 0;
         p->se.slice_max                 = 0;
         p->se.wait_max                  = 0;
+        p->sched_info.bkl_cnt           = 0;
 #endif
         p->se.sum_exec_runtime          = 0;
         p->se.prev_sum_exec_runtime     = 0;