[RFC 04/13] perf kwork: Add workqueue record support

[Yang Jihong <yangjihong1@huawei.com>]

Record workqueue events workqueue:workqueue_activate_work,
workqueue:workqueue_execute_start & workqueue:workqueue_execute_end

Record all events:

  # perf kwork record -o perf_kwork.date -- sleep 1
  [ perf record: Woken up 0 times to write data ]
  [ perf record: Captured and wrote 0.839 MB perf_kwork.date ]

  # perf evlist -i perf_kwork.date
  irq:irq_handler_entry
  irq:irq_handler_exit
  irq:softirq_raise
  irq:softirq_entry
  irq:softirq_exit
  workqueue:workqueue_activate_work
  workqueue:workqueue_execute_start
  workqueue:workqueue_execute_end
  dummy:HG

Record workqueue events:

  # perf kwork -k workqueue record -o perf_kwork.date -- sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.080 MB perf_kwork.date ]

  # perf evlist -i perf_kwork.date
  workqueue:workqueue_activate_work
  workqueue:workqueue_execute_start
  workqueue:workqueue_execute_end
  dummy:HG

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
 tools/perf/builtin-kwork.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index 0da554e04f16..cda6fcbc6e41 100644
--- a/tools/perf/builtin-kwork.c
+++ b/tools/perf/builtin-kwork.c
@@ -27,6 +27,7 @@
 enum kwork_class_type {
 	KWORK_CLASS_IRQ,
 	KWORK_CLASS_SOFTIRQ,
+	KWORK_CLASS_WORKQUEUE,
 	KWORK_CLASS_MAX,
 };
 
@@ -93,9 +94,22 @@ static struct kwork_class kwork_softirq = {
 	.tp_handlers    = softirq_tp_handlers,
 };
 
+const struct evsel_str_handler workqueue_tp_handlers[] = {
+	{ "workqueue:workqueue_activate_work", NULL, },
+	{ "workqueue:workqueue_execute_start", NULL, },
+	{ "workqueue:workqueue_execute_end",   NULL, },
+};
+
+static struct kwork_class kwork_workqueue = {
+	.name           = "workqueue",
+	.nr_tracepoints = 3,
+	.tp_handlers    = workqueue_tp_handlers,
+};
+
 static struct kwork_class *kwork_class_supported_list[KWORK_CLASS_MAX] = {
 	[KWORK_CLASS_IRQ]	= &kwork_irq,
 	[KWORK_CLASS_SOFTIRQ]	= &kwork_softirq,
+	[KWORK_CLASS_WORKQUEUE] = &kwork_workqueue,
 };
 
 static void setup_event_list(struct perf_kwork *kwork,
-- 
2.30.GIT