events, sched: Add tracepoint for accounting blocked time
This tracepoint shows how long a task is sleeping in uninterruptible state.
E.g. it may show how long and where a mutex is waited for.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1322471015-107825-8-git-send-email-avagin@openvz.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index cd3b642..7c62e2b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1030,6 +1030,8 @@
trace_sched_stat_iowait(tsk, delta);
}
+ trace_sched_stat_blocked(tsk, delta);
+
/*
* Blocking time is in units of nanosecs, so shift by
* 20 to get a milliseconds-range estimation of the
