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.
Showing the changes to kernel/workqueue.c (1 of 2 files). Show all
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| @@ -997,6 +997,7 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq, · 996 unmodified lines | ||
| 997 | 997 | |
| 998 | 998 | /* gcwq determined, get cwq and queue */ |
| 999 | 999 | cwq = get_cwq(gcwq->cpu, wq); |
| 1000 | + trace_workqueue_queue_work(cpu, cwq, work); | |
| 1000 | 1001 | |
| 1001 | 1002 | BUG_ON(!list_empty(&work->entry)); |
| 1002 | 1003 | |
| @@ -1004,6 +1005,7 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq, · 1 unmodified line | ||
| 1004 | 1005 | work_flags = work_color_to_flags(cwq->work_color); |
| 1005 | 1006 | |
| 1006 | 1007 | if (likely(cwq->nr_active < cwq->max_active)) { |
| 1008 | + trace_workqueue_activate_work(work); | |
| 1007 | 1009 | cwq->nr_active++; |
| 1008 | 1010 | worklist = gcwq_determine_ins_pos(gcwq, cwq); |
| 1009 | 1011 | } else { |
| @@ -1679,6 +1681,7 @@ static void cwq_activate_first_delayed(struct cpu_workqueue_struct *cwq) · 669 unmodified lines | ||
| 1679 | 1681 | struct work_struct, entry); |
| 1680 | 1682 | struct list_head *pos = gcwq_determine_ins_pos(cwq->gcwq, cwq); |
| 1681 | 1683 | |
| 1684 | + trace_workqueue_activate_work(work); | |
| 1682 | 1685 | move_linked_works(work, pos, NULL); |
| 1683 | 1686 | __clear_bit(WORK_STRUCT_DELAYED_BIT, work_data_bits(work)); |
| 1684 | 1687 | cwq->nr_active++; |