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perf sched: Prefer sched_waking event when it exists

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Commit fbd705a0c6 ("sched: Introduce the 'trace_sched_waking'
tracepoint") added sched_waking tracepoint which should be preferred
over sched_wakeup when analyzing scheduling delays.

Update 'perf sched record' to collect sched_waking events if it exists
and fallback to sched_wakeup if it does not. Similarly, update timehist
command to skip sched_wakeup events if the session includes sched_waking
(ie., sched_waking is preferred over sched_wakeup).

Signed-off-by: David Ahern <dsahern@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/20200807164844.44870-1-dsahern@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2020-08-07 10:48:44 -06:00 committed by Arnaldo Carvalho de Melo
parent f9f9506826
commit d566a9c2d4
1 changed files with 29 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

32
tools/perf/builtin-sched.c
View file

@ -2398,6 +2398,15 @@ static void timehist_print_wakeup_event(struct perf_sched *sched,
printf("\n");
}
static int timehist_sched_wakeup_ignore(struct perf_tool *tool __maybe_unused,
union perf_event *event __maybe_unused,
struct evsel *evsel __maybe_unused,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
return 0;
}
static int timehist_sched_wakeup_event(struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct evsel *evsel,
@ -2958,9 +2967,10 @@ static int timehist_check_attr(struct perf_sched *sched,
static int perf_sched__timehist(struct perf_sched *sched)
{
const struct evsel_str_handler handlers[] = {
struct evsel_str_handler handlers[] = {
{ "sched:sched_switch", timehist_sched_switch_event, },
{ "sched:sched_wakeup", timehist_sched_wakeup_event, },
{ "sched:sched_waking", timehist_sched_wakeup_event, },
{ "sched:sched_wakeup_new", timehist_sched_wakeup_event, },
};
const struct evsel_str_handler migrate_handlers[] = {
@ -3018,6 +3028,11 @@ static int perf_sched__timehist(struct perf_sched *sched)
setup_pager();
/* prefer sched_waking if it is captured */
if (perf_evlist__find_tracepoint_by_name(session->evlist,
"sched:sched_waking"))
handlers[1].handler = timehist_sched_wakeup_ignore;
/* setup per-evsel handlers */
if (perf_session__set_tracepoints_handlers(session, handlers))
goto out;
@ -3330,12 +3345,16 @@ static int __cmd_record(int argc, const char **argv)
"-e", "sched:sched_stat_iowait",
"-e", "sched:sched_stat_runtime",
"-e", "sched:sched_process_fork",
"-e", "sched:sched_wakeup",
"-e", "sched:sched_wakeup_new",
"-e", "sched:sched_migrate_task",
};
struct tep_event *waking_event;
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
/*
* +2 for either "-e", "sched:sched_wakeup" or
* "-e", "sched:sched_waking"
*/
rec_argc = ARRAY_SIZE(record_args) + 2 + argc - 1;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
if (rec_argv == NULL)
@ -3344,6 +3363,13 @@ static int __cmd_record(int argc, const char **argv)
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[i] = strdup(record_args[i]);
rec_argv[i++] = "-e";
waking_event = trace_event__tp_format("sched", "sched_waking");
if (!IS_ERR(waking_event))
rec_argv[i++] = strdup("sched:sched_waking");
else
rec_argv[i++] = strdup("sched:sched_wakeup");
for (j = 1; j < (unsigned int)argc; j++, i++)
rec_argv[i] = argv[j];