Commit ad3b301a authored by Changwoo Min's avatar Changwoo Min Committed by Tejun Heo
Browse files

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

kernel/sched/ext.c

+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);