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Commit b781a602 authored by Andrew Vagin's avatar Andrew Vagin Committed by Ingo Molnar
Browse files

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: default avatarAndrew Vagin <avagin@openvz.org>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1322471015-107825-8-git-send-email-avagin@openvz.org


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 391e43da

include/trace/events/sched.h

+7 −0
Original line number Diff line number Diff line
@@ -330,6 +330,13 @@ DEFINE_EVENT(sched_stat_template, sched_stat_iowait, 
	     TP_PROTO(struct task_struct *tsk, u64 delay),

	     TP_ARGS(tsk, delay));



/*

 * Tracepoint for accounting blocked time (time the task is in uninterruptible).

 */

DEFINE_EVENT(sched_stat_template, sched_stat_blocked,

	     TP_PROTO(struct task_struct *tsk, u64 delay),

	     TP_ARGS(tsk, delay));



/*

 * Tracepoint for accounting runtime (time the task is executing

 * on a CPU).

kernel/sched/fair.c

+2 −0
Original line number Diff line number Diff line
@@ -1030,6 +1030,8 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) 
				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