kernel/sched/core.c

1355  * Serializes updates of utilization clamp values
1357  * The (slow-path) user-space triggers utilization clamp value updates which
1444 	 * idle (which drops the max-clamp) by retaining the last known
1445 	 * max-clamp.
1458 	/* Reset max-clamp retention only on idle exit */
1482 	/* No tasks -- default clamp values */
1533 	value = clamp(value, tg_min, tg_max);
1541  * The effective clamp bucket index of a task depends on, by increasing
1543  * - the task specific clamp value, when explicitly requested from userspace
1544  * - the task group effective clamp value, for tasks not either in the root
1546  * - the system default clamp value, defined by the sysadmin
1575  * When a task is enqueued on a rq, the clamp bucket currently defined by the
1577  * updates the rq's clamp value if required.
1582  * for each bucket when all its RUNNABLE tasks require the same clamp.
1593 	/* Update task effective clamp */
1604 	 * "requested" clamp value of its RUNNABLE tasks.
1614  * When a task is dequeued from a rq, the clamp bucket refcounted by the task
1616  * active clamp value, then the rq's clamp value is updated.
1618  * Both refcounted tasks and rq's cached clamp values are expected to be
1670 	 * The rq clamp bucket value is reset to its base value whenever
1707 	/* Reset clamp idle holding when there is one RUNNABLE task */
1767 	 * Setting the clamp bucket is serialized by task_rq_lock().
1769 	 * affecting a valid clamp bucket, the next time it's enqueued,
1770 	 * it will already see the updated clamp bucket value.
1940 	/* Reset on sched class change for a non user-defined clamp value. */
2055 	/* System defaults allow max clamp values for both indexes */
7370 	increment = clamp(increment, -NICE_WIDTH, NICE_WIDTH);
8098 	attr->sched_nice = clamp(attr->sched_nice, MIN_NICE, MAX_NICE);