Commit ad3b301a authored by Changwoo Min's avatar Changwoo Min Committed by Tejun Heo
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sched_ext: Provides a sysfs 'events' to expose core event counters



Add a sysfs entry at /sys/kernel/sched_ext/root/events to expose core
event counters through the files system interface. Each line of the file
shows the event name and its counter value.

In addition, the format of scx_dump_event() is adjusted as the event name
gets longer.

Signed-off-by: default avatarChangwoo Min <changwoo@igalia.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 3539c641
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+26 −1
Original line number Diff line number Diff line
@@ -1576,7 +1576,7 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_stats_cpu);
 * @kind: a kind of event to dump
 */
#define scx_dump_event(s, events, kind) do {					\
	dump_line(&(s), "%30s: %16llu", #kind, (events)->kind);			\
	dump_line(&(s), "%40s: %16llu", #kind, (events)->kind);			\
} while (0)


@@ -4383,8 +4383,33 @@ static ssize_t scx_attr_ops_show(struct kobject *kobj,
}
SCX_ATTR(ops);

#define scx_attr_event_show(buf, at, events, kind) ({				\
	sysfs_emit_at(buf, at, "%s %llu\n", #kind, (events)->kind);		\
})

static ssize_t scx_attr_events_show(struct kobject *kobj,
				    struct kobj_attribute *ka, char *buf)
{
	struct scx_event_stats events;
	int at = 0;

	scx_bpf_events(&events, sizeof(events));
	at += scx_attr_event_show(buf, at, &events, SCX_EV_SELECT_CPU_FALLBACK);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_DISPATCH_KEEP_LAST);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_ENQ_SKIP_EXITING);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_ENQ_SKIP_MIGRATION_DISABLED);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_ENQ_SLICE_DFL);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_BYPASS_DURATION);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_BYPASS_DISPATCH);
	at += scx_attr_event_show(buf, at, &events, SCX_EV_BYPASS_ACTIVATE);
	return at;
}
SCX_ATTR(events);

static struct attribute *scx_sched_attrs[] = {
	&scx_attr_ops.attr,
	&scx_attr_events.attr,
	NULL,
};
ATTRIBUTE_GROUPS(scx_sched);