linux-kernel - [PATCH] workqueue: Add a trace event for works enqueuing

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Date:	Thu, 30 Sep 2010 17:39:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] workqueue: Add a trace event for works enqueuing

Tracing worklet queuing provides useful informations to understand
their lifecycles. Combined with timers trace events, we can also
extend the informations about this lifecycle from delayed queueing.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...e.hu>
---
 include/trace/events/workqueue.h |   32 ++++++++++++++++++++++++++++++++
 kernel/workqueue.c               |    2 ++
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
index 49682d7..4c2ec52 100644
--- a/include/trace/events/workqueue.h
+++ b/include/trace/events/workqueue.h
@@ -7,6 +7,38 @@
 #include <linux/tracepoint.h>
 #include <linux/workqueue.h>
 
+
+/**
+ * workqueue_queue_work - called when a work gets queued
+ * @work:	pointer to struct work_struct
+ * @wq:		workqueue structure
+ *
+ * Allows to track workqueue execution. This event occurs when
+ * a work is queued immediately or once a delayed work is actually
+ * queued on a workqueue (ie: once the delay has been reached).
+ */
+TRACE_EVENT(workqueue_queue_work,
+
+	TP_PROTO(struct work_struct *work, struct workqueue_struct *wq),
+
+	TP_ARGS(work, wq),
+
+	TP_STRUCT__entry(
+		__field( void *,	work	)
+		__field( void *,	function)
+		__field( void *,	workqueue)
+	),
+
+	TP_fast_assign(
+		__entry->work		= work;
+		__entry->function	= work->func;
+		__entry->workqueue	= wq;
+	),
+
+	TP_printk("work struct=%p function=%pf workqueue=%p",
+			__entry->work, __entry->function, __entry->workqueue)
+);
+
 /**
  * workqueue_execute_start - called immediately before the workqueue callback
  * @work:	pointer to struct work_struct
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f77afd9..5ed9f89 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -959,6 +959,8 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
 	if (WARN_ON_ONCE(wq->flags & WQ_DYING))
 		return;
 
+	trace_workqueue_queue_work(work, wq);
+
 	/* determine gcwq to use */
 	if (!(wq->flags & WQ_UNBOUND)) {
 		struct global_cwq *last_gcwq;
-- 
1.6.2.3

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