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Commit cdadf009 authored by Tejun Heo's avatar Tejun Heo
Browse files

workqueue: add queue_work and activate_work trace points 



These two tracepoints allow tracking when and how a work is queued and
activated.  This patch is based on Frederic's patch to add queue_work
trace point.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
parent 97bd2347

include/trace/events/workqueue.h

+53 −0
Original line number Diff line number Diff line
@@ -24,6 +24,59 @@ DECLARE_EVENT_CLASS(workqueue_work, 
	TP_printk("work struct %p", __entry->work)

);



/**

 * workqueue_queue_work - called when a work gets queued

 * @req_cpu:	the requested cpu

 * @cwq:	pointer to struct cpu_workqueue_struct

 * @work:	pointer to struct work_struct

 *

 * 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(unsigned int req_cpu, struct cpu_workqueue_struct *cwq,

		 struct work_struct *work),



	TP_ARGS(req_cpu, cwq, work),



	TP_STRUCT__entry(

		__field( void *,	work	)

		__field( void *,	function)

		__field( void *,	workqueue)

		__field( unsigned int,	req_cpu	)

		__field( unsigned int,	cpu	)

	),



	TP_fast_assign(

		__entry->work		= work;

		__entry->function	= work->func;

		__entry->workqueue	= cwq->wq;

		__entry->req_cpu	= req_cpu;

		__entry->cpu		= cwq->gcwq->cpu;

	),



	TP_printk("work struct=%p function=%pf workqueue=%p req_cpu=%u cpu=%u",

		  __entry->work, __entry->function, __entry->workqueue,

		  __entry->req_cpu, __entry->cpu)

);



/**

 * workqueue_activate_work - called when a work gets activated

 * @work:	pointer to struct work_struct

 *

 * This event occurs when a queued work is put on the active queue,

 * which happens immediately after queueing unless @max_active limit

 * is reached.

 */

DEFINE_EVENT(workqueue_work, workqueue_activate_work,



	TP_PROTO(struct work_struct *work),



	TP_ARGS(work)

);



/**

 * workqueue_execute_start - called immediately before the workqueue callback

 * @work:	pointer to struct work_struct

kernel/workqueue.c

+3 −0
Original line number Diff line number Diff line
@@ -997,6 +997,7 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq, 


	/* gcwq determined, get cwq and queue */

	cwq = get_cwq(gcwq->cpu, wq);

	trace_workqueue_queue_work(cpu, cwq, work);



	BUG_ON(!list_empty(&work->entry));
@@ -1004,6 +1005,7 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq, 
	work_flags = work_color_to_flags(cwq->work_color);



	if (likely(cwq->nr_active < cwq->max_active)) {

		trace_workqueue_activate_work(work);

		cwq->nr_active++;

		worklist = gcwq_determine_ins_pos(gcwq, cwq);

	} else {
@@ -1679,6 +1681,7 @@ static void cwq_activate_first_delayed(struct cpu_workqueue_struct *cwq) 
						    struct work_struct, entry);

	struct list_head *pos = gcwq_determine_ins_pos(cwq->gcwq, cwq);



	trace_workqueue_activate_work(work);

	move_linked_works(work, pos, NULL);

	__clear_bit(WORK_STRUCT_DELAYED_BIT, work_data_bits(work));

	cwq->nr_active++;