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Subject[RFC v2 08/17] perf kwork: Add softirq report support
Date
Implements softirq kwork report function.

Test cases:

# perf kwork -k softirq rep

Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
(s)TIMER:1 | 0003 | 181.387 ms | 2476 | 1.240 ms | 44004.787960 s | 44004.789201 s |
(s)RCU:9 | 0003 | 91.573 ms | 2193 | 0.650 ms | 44004.790258 s | 44004.790908 s |
(s)RCU:9 | 0001 | 78.960 ms | 1619 | 1.195 ms | 44001.496553 s | 44001.497749 s |
(s)SCHED:7 | 0003 | 55.962 ms | 1255 | 0.954 ms | 44004.812008 s | 44004.812962 s |
... <SNIP> ...
(s)RCU:9 | 0004 | 0.830 ms | 26 | 0.058 ms | 43997.666418 s | 43997.666476 s |
(s)TIMER:1 | 0001 | 0.471 ms | 4 | 0.158 ms | 44007.834694 s | 44007.834852 s |
(s)RCU:9 | 0006 | 0.220 ms | 7 | 0.048 ms | 44004.833764 s | 44004.833812 s |
(s)NET_RX:3 | 0002 | 0.164 ms | 5 | 0.049 ms | 44005.012418 s | 44005.012466 s |
(s)TIMER:1 | 0005 | 0.164 ms | 1 | 0.164 ms | 44007.820474 s | 44007.820638 s |
(s)TIMER:1 | 0006 | 0.087 ms | 1 | 0.087 ms | 44000.830807 s | 44000.830894 s |
(s)SCHED:7 | 0006 | 0.080 ms | 2 | 0.044 ms | 43997.826145 s | 43997.826189 s |
--------------------------------------------------------------------------------------------------------------------------------

#
# perf kwork -k softirq rep -S

Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
(s)TIMER:1 | 0003 | 181.387 ms | 2476 | 1.240 ms | 44004.787960 s | 44004.789201 s |
(s)RCU:9 | 0003 | 91.573 ms | 2193 | 0.650 ms | 44004.790258 s | 44004.790908 s |
(s)RCU:9 | 0001 | 78.960 ms | 1619 | 1.195 ms | 44001.496553 s | 44001.497749 s |
(s)SCHED:7 | 0000 | 63.631 ms | 680 | 2.690 ms | 44006.721976 s | 44006.724666 s |
... <SNIP> ...
(s)SCHED:7 | 0003 | 55.962 ms | 1255 | 0.954 ms | 44004.812008 s | 44004.812962 s |
(s)RCU:9 | 0006 | 0.220 ms | 7 | 0.048 ms | 44004.833764 s | 44004.833812 s |
(s)NET_RX:3 | 0002 | 0.164 ms | 5 | 0.049 ms | 44005.012418 s | 44005.012466 s |
(s)TIMER:1 | 0005 | 0.164 ms | 1 | 0.164 ms | 44007.820474 s | 44007.820638 s |
(s)TIMER:1 | 0006 | 0.087 ms | 1 | 0.087 ms | 44000.830807 s | 44000.830894 s |
(s)SCHED:7 | 0006 | 0.080 ms | 2 | 0.044 ms | 43997.826145 s | 43997.826189 s |
--------------------------------------------------------------------------------------------------------------------------------
Total count : 12748
Total runtime (msec) : 661.433 (0.065% load average)
Total time span (msec) : 10176.441
--------------------------------------------------------------------------------------------------------------------------------

#
# perf kwork -k softirq rep -s freq,max

Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
(s)TIMER:1 | 0003 | 181.387 ms | 2476 | 1.240 ms | 44004.787960 s | 44004.789201 s |
(s)RCU:9 | 0003 | 91.573 ms | 2193 | 0.650 ms | 44004.790258 s | 44004.790908 s |
(s)SCHED:7 | 0002 | 50.039 ms | 1731 | 0.074 ms | 44005.009447 s | 44005.009521 s |
(s)RCU:9 | 0001 | 78.960 ms | 1619 | 1.195 ms | 44001.496553 s | 44001.497749 s |
(s)SCHED:7 | 0003 | 55.962 ms | 1255 | 0.954 ms | 44004.812008 s | 44004.812962 s |
... <SNIP> ...
(s)RCU:9 | 0002 | 35.241 ms | 932 | 0.407 ms | 44005.009541 s | 44005.009949 s |
(s)RCU:9 | 0000 | 45.710 ms | 702 | 1.144 ms | 44004.787023 s | 44004.788167 s |
(s)SCHED:7 | 0006 | 0.080 ms | 2 | 0.044 ms | 43997.826145 s | 43997.826189 s |
(s)TIMER:1 | 0005 | 0.164 ms | 1 | 0.164 ms | 44007.820474 s | 44007.820638 s |
(s)TIMER:1 | 0006 | 0.087 ms | 1 | 0.087 ms | 44000.830807 s | 44000.830894 s |
--------------------------------------------------------------------------------------------------------------------------------

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
tools/perf/builtin-kwork.c | 98 +++++++++++++++++++++++++++++++++++++-
1 file changed, 96 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index b1993be0a20a..8680fe3795d4 100644
--- a/tools/perf/builtin-kwork.c
+++ b/tools/perf/builtin-kwork.c
@@ -550,17 +550,111 @@ static struct kwork_class kwork_irq = {
.work_name = irq_work_name,
};

+static struct kwork_class kwork_softirq;
+static int process_softirq_entry_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->entry_event)
+ return kwork->tp_handler->entry_event(kwork, &kwork_softirq,
+ evsel, sample, machine);
+
+ return 0;
+}
+
+static int process_softirq_exit_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->exit_event)
+ return kwork->tp_handler->exit_event(kwork, &kwork_softirq,
+ evsel, sample, machine);
+
+ return 0;
+}
+
const struct evsel_str_handler softirq_tp_handlers[] = {
{ "irq:softirq_raise", NULL, },
- { "irq:softirq_entry", NULL, },
- { "irq:softirq_exit", NULL, },
+ { "irq:softirq_entry", process_softirq_entry_event, },
+ { "irq:softirq_exit", process_softirq_exit_event, },
};

+static int softirq_class_init(struct kwork_class *class,
+ struct perf_session *session)
+{
+ if (perf_session__set_tracepoints_handlers(session,
+ softirq_tp_handlers)) {
+ pr_err("Failed to set softirq tracepoints handlers\n");
+ return -1;
+ }
+
+ class->work_root = RB_ROOT_CACHED;
+ return 0;
+}
+
+static char *evsel__softirq_name(struct evsel *evsel, u64 num)
+{
+ char *name = NULL;
+ bool found = false;
+ struct tep_print_flag_sym *sym = NULL;
+ struct tep_print_arg *args = evsel->tp_format->print_fmt.args;
+
+ if ((args == NULL) || (args->next == NULL))
+ return NULL;
+
+ /* skip softirq field: "REC->vec" */
+ for (sym = args->next->symbol.symbols; sym != NULL; sym = sym->next) {
+ if ((eval_flag(sym->value) == (unsigned long long)num) &&
+ (strlen(sym->str) != 0)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return NULL;
+
+ name = strdup(sym->str);
+ if (name == NULL) {
+ pr_err("Failed to copy symbol name\n");
+ return NULL;
+ }
+ return name;
+}
+
+static void softirq_work_init(struct kwork_class *class,
+ struct kwork_work *work,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine __maybe_unused)
+{
+ u64 num = evsel__intval(evsel, sample, "vec");
+
+ work->id = num;
+ work->class = class;
+ work->cpu = sample->cpu;
+ work->name = evsel__softirq_name(evsel, num);
+}
+
+static void softirq_work_name(struct kwork_work *work, char *buf, int len)
+{
+ snprintf(buf, len, "(s)%s:%" PRIu64 "", work->name, work->id);
+}
+
static struct kwork_class kwork_softirq = {
.name = "softirq",
.type = KWORK_CLASS_SOFTIRQ,
.nr_tracepoints = 3,
.tp_handlers = softirq_tp_handlers,
+ .class_init = softirq_class_init,
+ .work_init = softirq_work_init,
+ .work_name = softirq_work_name,
};

const struct evsel_str_handler workqueue_tp_handlers[] = {
--
2.30.GIT
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