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Subject[RFC v2 12/17] perf kwork: Add workqueue latency support
Date
Implements workqueue latency function.

Test cases:

# perf kwork -k workqueue lat

Kwork Name | Cpu | Avg delay | Count | Max delay | Max delay start | Max delay end |
--------------------------------------------------------------------------------------------------------------------------------
(w)vmstat_update | 0001 | 5.004 ms | 1 | 5.004 ms | 44001.745646 s | 44001.750650 s |
(w)vmstat_update | 0006 | 1.773 ms | 1 | 1.773 ms | 44000.830840 s | 44000.832613 s |
(w)vmstat_shepherd | 0000 | 0.992 ms | 8 | 2.474 ms | 44007.717845 s | 44007.720318 s |
(w)vmstat_update | 0000 | 0.974 ms | 5 | 2.624 ms | 44004.785970 s | 44004.788594 s |
(w)e1000_watchdog | 0002 | 0.687 ms | 5 | 2.632 ms | 44005.009334 s | 44005.011966 s |
(w)vmstat_update | 0002 | 0.307 ms | 1 | 0.307 ms | 44004.817395 s | 44004.817702 s |
(w)vmstat_update | 0004 | 0.296 ms | 1 | 0.296 ms | 43997.913677 s | 43997.913973 s |
(w)mix_interrupt_randomness | 0000 | 0.283 ms | 285 | 3.724 ms | 44006.790889 s | 44006.794613 s |
(w)neigh_managed_work | 0001 | 0.271 ms | 1 | 0.271 ms | 43997.665542 s | 43997.665813 s |
(w)vmstat_update | 0005 | 0.261 ms | 1 | 0.261 ms | 44007.820542 s | 44007.820803 s |
(w)neigh_managed_work | 0004 | 0.220 ms | 1 | 0.220 ms | 44002.953287 s | 44002.953507 s |
(w)neigh_periodic_work | 0004 | 0.217 ms | 1 | 0.217 ms | 43999.929718 s | 43999.929935 s |
(w)mix_interrupt_randomness | 0002 | 0.199 ms | 5 | 0.310 ms | 44005.012316 s | 44005.012625 s |
(w)vmstat_update | 0003 | 0.199 ms | 4 | 0.307 ms | 44005.714391 s | 44005.714699 s |
(w)gc_worker | 0001 | 0.071 ms | 173 | 1.128 ms | 44002.062579 s | 44002.063707 s |
--------------------------------------------------------------------------------------------------------------------------------
INFO: 0.020% skipped events (17 including 10 raise, 7 entry, 0 exit)

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
tools/perf/builtin-kwork.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index fa09d4eea913..4902bc73aca1 100644
--- a/tools/perf/builtin-kwork.c
+++ b/tools/perf/builtin-kwork.c
@@ -767,6 +767,20 @@ static struct kwork_class kwork_softirq = {
};

static struct kwork_class kwork_workqueue;
+static int process_workqueue_activate_work_event(struct perf_tool *tool,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_kwork *kwork = container_of(tool, struct perf_kwork, tool);
+
+ if (kwork->tp_handler->raise_event)
+ return kwork->tp_handler->raise_event(kwork, &kwork_workqueue,
+ evsel, sample, machine);
+
+ return 0;
+}
+
static int process_workqueue_execute_start_event(struct perf_tool *tool,
struct evsel *evsel,
struct perf_sample *sample,
@@ -796,7 +810,7 @@ static int process_workqueue_execute_end_event(struct perf_tool *tool,
}

const struct evsel_str_handler workqueue_tp_handlers[] = {
- { "workqueue:workqueue_activate_work", NULL, },
+ { "workqueue:workqueue_activate_work", process_workqueue_activate_work_event, },
{ "workqueue:workqueue_execute_start", process_workqueue_execute_start_event, },
{ "workqueue:workqueue_execute_end", process_workqueue_execute_end_event, },
};
--
2.30.GIT
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