Commit 38d8d013 authored by Yang Jihong's avatar Yang Jihong Committed by Arnaldo Carvalho de Melo
Browse files

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 [<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

Reviewed-by: default avatarIan Rogers <irogers@google.com>
Signed-off-by: default avatarYang Jihong <yangjihong1@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Link: https://lore.kernel.org/r/20230812084917.169338-8-yangjihong1@huawei.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 26b7254f

tools/perf/Documentation/perf-kwork.txt

+1 −1
Original line number Diff line number Diff line
@@ -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::

tools/perf/builtin-kwork.c

+68 −1
Original line number Diff line number Diff line
@@ -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()

	};

tools/perf/util/kwork.h

+5 −0
Original line number Diff line number Diff line
@@ -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 {