Commit 1c5183aa authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'sched-urgent-2025-03-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull misc scheduler fixes from Ingo Molnar:

 - Fix deadline scheduler sysctl parameter setting bug

 - Fix RT scheduler sysctl parameter setting bug

 - Fix possible memory corruption in child_cfs_rq_on_list()

* tag 'sched-urgent-2025-03-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/rt: Update limit of sched_rt sysctl in documentation
  sched/deadline: Use online cpus for validating runtime
  sched/fair: Fix potential memory corruption in child_cfs_rq_on_list
parents ab60bd57 b1536481

Documentation/scheduler/sched-rt-group.rst

+3 −0
Original line number Diff line number Diff line
@@ -102,6 +102,9 @@ The system wide settings are configured under the /proc virtual file system: 
  * sched_rt_period_us takes values from 1 to INT_MAX.

  * sched_rt_runtime_us takes values from -1 to sched_rt_period_us.

  * A run time of -1 specifies runtime == period, ie. no limit.

  * sched_rt_runtime_us/sched_rt_period_us > 0.05 inorder to preserve

    bandwidth for fair dl_server. For accurate value check average of

    runtime/period in /sys/kernel/debug/sched/fair_server/cpuX/





2.2 Default behaviour

kernel/sched/deadline.c

+1 −1
Original line number Diff line number Diff line
@@ -3189,7 +3189,7 @@ int sched_dl_global_validate(void) 
	 * value smaller than the currently allocated bandwidth in

	 * any of the root_domains.

	 */

	for_each_possible_cpu(cpu) {

	for_each_online_cpu(cpu) {

		rcu_read_lock_sched();



		if (dl_bw_visited(cpu, gen))

kernel/sched/fair.c

+4 −2
Original line number Diff line number Diff line
@@ -4045,15 +4045,17 @@ static inline bool child_cfs_rq_on_list(struct cfs_rq *cfs_rq) 
{

	struct cfs_rq *prev_cfs_rq;

	struct list_head *prev;

	struct rq *rq = rq_of(cfs_rq);



	if (cfs_rq->on_list) {

		prev = cfs_rq->leaf_cfs_rq_list.prev;

	} else {

		struct rq *rq = rq_of(cfs_rq);



		prev = rq->tmp_alone_branch;

	}



	if (prev == &rq->leaf_cfs_rq_list)

		return false;



	prev_cfs_rq = container_of(prev, struct cfs_rq, leaf_cfs_rq_list);



	return (prev_cfs_rq->tg->parent == cfs_rq->tg);