perf kwork: Add softirq report support

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 count,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 |
   --------------------------------------------------------------------------------------------------------------------------------

Committer testing:

  # perf kwork -k softirq report -C 2 -s count,max

  Kwork Name                     | Cpu  | Total Runtime | Count     | Max runtime   | Max runtime start   | Max runtime end     |
 --------------------------------------------------------------------------------------------------------------------------------
  (s)SCHED:7                     | 0002 |      0.980 ms |       159 |      0.024 ms |      26035.571037 s |      26035.571061 s |
  (s)RCU:9                       | 0002 |      0.124 ms |        88 |      0.021 ms |      26035.177050 s |      26035.177071 s |
  (s)TIMER:1                     | 0002 |      0.122 ms |        56 |      0.007 ms |      26035.468045 s |      26035.468052 s |
 --------------------------------------------------------------------------------------------------------------------------------

  #

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220709015033.38326-9-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index 46c0052..bdfeea3 100644 (file)
--- 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[] = {