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Subject[PATCH 08/19] workqueue_tracepoint: add workqueue_flush and worklet_cancel tracepoint
Date
From: Zhaolei <zhaolei@cn.fujitsu.com>

Ingo Molnar <mingo@elte.hu> wrote:
> This allows the understanding of the life cycle of a workqueue and
> of worklets that enter that workqueue.

[ Impact: provide finer grained details about life of worklets ]

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
include/trace/events/workqueue.h | 36 ++++++++++++++++++++++++++++++++++++
kernel/workqueue.c | 4 ++++
2 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
index 36f4939..2e77e84 100644
--- a/include/trace/events/workqueue.h
+++ b/include/trace/events/workqueue.h
@@ -76,6 +76,23 @@ TRACE_EVENT(workqueue_handler_exit,
__entry->thread_pid, __entry->work)
);

+TRACE_EVENT(worklet_cancel,
+
+ TP_PROTO(struct work_struct *work),
+
+ TP_ARGS(work),
+
+ TP_STRUCT__entry(
+ __field(work_func_t, func)
+ ),
+
+ TP_fast_assign(
+ __entry->func = work->func;
+ ),
+
+ TP_printk("func=%pF", __entry->func)
+);
+
/* Trace the creation of one workqueue thread on a cpu */
TRACE_EVENT(workqueue_creation,

@@ -99,6 +116,25 @@ TRACE_EVENT(workqueue_creation,
__entry->thread_pid, __entry->cpu)
);

+TRACE_EVENT(workqueue_flush,
+
+ TP_PROTO(struct task_struct *wq_thread),
+
+ TP_ARGS(wq_thread),
+
+ TP_STRUCT__entry(
+ __array(char, thread_comm, TASK_COMM_LEN)
+ __field(pid_t, thread_pid)
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
+ __entry->thread_pid = wq_thread->pid;
+ ),
+
+ TP_printk("thread=%s:%d", __entry->thread_comm, __entry->thread_pid)
+);
+
TRACE_EVENT(workqueue_destruction,

TP_PROTO(struct task_struct *wq_thread),
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index fbcdfa2..99a81ba 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -366,6 +366,8 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
int active = 0;
struct wq_barrier barr;

+ trace_workqueue_flush(cwq->thread);
+
WARN_ON(cwq->thread == current);

spin_lock_irq(&cwq->lock);
@@ -542,6 +544,8 @@ static int __cancel_work_timer(struct work_struct *work,
{
int ret;

+ trace_worklet_cancel(work);
+
do {
ret = (timer && likely(del_timer(timer)));
if (!ret)
--
1.6.2.3


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