linux-kernel - [PATCH 7/7] event: add tracepoint for accounting block time

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Date:	Mon, 28 Nov 2011 12:03:35 +0300
From:	Andrew Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...e.hu,
	acme@...stprotocols.net, asharma@...com, devel@...nvz.org,
	dsahern@...il.com, linux-perf-users@...r.kernel.org
Subject: [PATCH 7/7] event: add tracepoint for accounting block 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.

Signed-off-by: Andrew Vagin <avagin@...nvz.org>
---
 include/trace/events/sched.h |    7 +++++++
 kernel/sched_fair.c          |    2 ++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 959ff18..be077cf 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -331,6 +331,13 @@ DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
 	     TP_ARGS(tsk, delay));
 
 /*
+ * Tracepoint for accounting block time (time the task is in uninterruptible).
+ */
+DEFINE_EVENT(sched_stat_template, sched_stat_block,
+	     TP_PROTO(struct task_struct *tsk, u64 delay),
+	     TP_ARGS(tsk, delay));
+
+/*
  * Tracepoint for accounting runtime (time the task is executing
  * on a CPU).
  */
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5c9e679..0d7b156 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -907,6 +907,8 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 				trace_sched_stat_iowait(tsk, delta);
 			}
 
+			trace_sched_stat_block(tsk, delta);
+
 			/*
 			 * Blocking time is in units of nanosecs, so shift by
 			 * 20 to get a milliseconds-range estimation of the
-- 
1.7.1

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