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sched_ext: Provides a sysfs 'events' to expose core event counters

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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: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Changwoo Min 2025-02-14 18:57:36 +09:00 committed by Tejun Heo
parent 3539c6411a
commit ad3b301aa0
1 changed files with 26 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

27
kernel/sched/ext.c
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@ -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);