From 38d8d013a525daf4f98a2b53065d8e89d5f810dd Mon Sep 17 00:00:00 2001 From: Yang Jihong Date: Sat, 12 Aug 2023 08:49:08 +0000 Subject: perf kwork: Add sched record support 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 [] {record|report|latency|timehist} -D, --dump-raw-trace dump raw trace in ASCII -f, --force don't complain, do it -k, --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 Reviewed-by: Ian Rogers Signed-off-by: Yang Jihong Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Sandipan Das Link: https://lore.kernel.org/r/20230812084917.169338-8-yangjihong1@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-kwork.c | 69 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 68 insertions(+), 1 deletion(-) (limited to 'tools/perf/builtin-kwork.c') diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c index e859c34b23f3..4e2b9103b9e0 100644 --- a/tools/perf/builtin-kwork.c +++ b/tools/perf/builtin-kwork.c @@ -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() }; -- cgit