The kwork_class type of sched is added to support recording and parsing of
sched_switch events.
As follows:
# perf kwork -h
Usage: perf kwork [<options>] {record|report|latency|timehist}
-D, --dump-raw-trace dump raw trace in ASCII
-f, --force don't complain, do it
-k, --kwork <kwork> list of kwork to profile (irq, softirq, workqueue, sched, etc)
-v, --verbose be more verbose (show symbol address, etc)
# perf kwork -k sched record true
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.083 MB perf.data (47 samples) ]
# perf evlist
sched:sched_switch
dummy:HG
# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
tools/perf/Documentation/perf-kwork.txt | 2 +-
tools/perf/builtin-kwork.c | 69 ++++++++++++++++++++++++-
tools/perf/util/kwork.h | 5 ++
3 files changed, 74 insertions(+), 2 deletions(-)
@@ -66,7 +66,7 @@ OPTIONS
-k::
--kwork::
- List of kwork to profile (irq, softirq, workqueue, etc)
+ List of kwork to profile (irq, softirq, workqueue, sched, etc)
-v::
--verbose::
@@ -1084,10 +1084,77 @@ static struct kwork_class kwork_workqueue = {
.work_name = workqueue_work_name,
};
+static struct kwork_class kwork_sched;
+static int process_sched_switch_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->sched_switch_event)
+ return kwork->tp_handler->sched_switch_event(kwork, &kwork_sched,
+ evsel, sample, machine);
+ return 0;
+}
+
+const struct evsel_str_handler sched_tp_handlers[] = {
+ { "sched:sched_switch", process_sched_switch_event, },
+};
+
+static int sched_class_init(struct kwork_class *class,
+ struct perf_session *session)
+{
+ if (perf_session__set_tracepoints_handlers(session,
+ sched_tp_handlers)) {
+ pr_err("Failed to set sched tracepoints handlers\n");
+ return -1;
+ }
+
+ class->work_root = RB_ROOT_CACHED;
+ return 0;
+}
+
+static void sched_work_init(struct perf_kwork *kwork __maybe_unused,
+ struct kwork_class *class,
+ struct kwork_work *work,
+ enum kwork_trace_type src_type,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine __maybe_unused)
+{
+ work->class = class;
+ work->cpu = sample->cpu;
+
+ if (src_type == KWORK_TRACE_EXIT) {
+ work->id = evsel__intval(evsel, sample, "prev_pid");
+ work->name = strdup(evsel__strval(evsel, sample, "prev_comm"));
+ } else if (src_type == KWORK_TRACE_ENTRY) {
+ work->id = evsel__intval(evsel, sample, "next_pid");
+ work->name = strdup(evsel__strval(evsel, sample, "next_comm"));
+ }
+}
+
+static void sched_work_name(struct kwork_work *work, char *buf, int len)
+{
+ snprintf(buf, len, "%s", work->name);
+}
+
+static struct kwork_class kwork_sched = {
+ .name = "sched",
+ .type = KWORK_CLASS_SCHED,
+ .nr_tracepoints = ARRAY_SIZE(sched_tp_handlers),
+ .tp_handlers = sched_tp_handlers,
+ .class_init = sched_class_init,
+ .work_init = sched_work_init,
+ .work_name = sched_work_name,
+};
+
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,
+ [KWORK_CLASS_SCHED] = &kwork_sched,
};
static void print_separator(int len)
@@ -1740,7 +1807,7 @@ int cmd_kwork(int argc, const char **argv)
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_STRING('k', "kwork", &kwork.event_list_str, "kwork",
- "list of kwork to profile (irq, softirq, workqueue, etc)"),
+ "list of kwork to profile (irq, softirq, workqueue, sched, etc)"),
OPT_BOOLEAN('f', "force", &kwork.force, "don't complain, do it"),
OPT_END()
};
@@ -16,6 +16,7 @@ enum kwork_class_type {
KWORK_CLASS_IRQ,
KWORK_CLASS_SOFTIRQ,
KWORK_CLASS_WORKQUEUE,
+ KWORK_CLASS_SCHED,
KWORK_CLASS_MAX,
};
@@ -167,6 +168,10 @@ struct trace_kwork_handler {
int (*exit_event)(struct perf_kwork *kwork,
struct kwork_class *class, struct evsel *evsel,
struct perf_sample *sample, struct machine *machine);
+
+ int (*sched_switch_event)(struct perf_kwork *kwork,
+ struct kwork_class *class, struct evsel *evsel,
+ struct perf_sample *sample, struct machine *machine);
};
struct perf_kwork {