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perf kwork: Add sched record support

Browse source 
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: Ian Rogers <irogers@google.com>
Signed-off-by: Yang 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Yang Jihong 2023-08-12 08:49:08 +00:00 committed by Arnaldo Carvalho de Melo
parent 26b7254ff1
commit 38d8d013a5
3 changed files with 74 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
tools/perf/Documentation/perf-kwork.txt
View file

@ -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::

69
tools/perf/builtin-kwork.c
View file

@ -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()
};

5
tools/perf/util/kwork.h
View file

@ -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 {