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    Subject[RFC v4 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 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 |
    --------------------------------------------------------------------------------------------------------------------------------

    Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
    ---
    tools/perf/builtin-kwork.c | 100 ++++++++++++++++++++++++++++++++++++-
    1 file changed, 98 insertions(+), 2 deletions(-)

    diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
    index 8b96113529dd..c6e94d54ca36 100644
    --- a/tools/perf/builtin-kwork.c
    +++ b/tools/perf/builtin-kwork.c
    @@ -555,17 +555,113 @@ 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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