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- Make sure the check for lost pelt idle time is done unconditionally to 

have correct lost idle time accounting
 
 - Stop the deadline server task before a CPU goes offline
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Merge tag 'sched_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fixes from Borislav Petkov:

 - Make sure the check for lost pelt idle time is done unconditionally
   to have correct lost idle time accounting

 - Stop the deadline server task before a CPU goes offline

* tag 'sched_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Fix pelt lost idle time detection
  sched/deadline: Stop dl_server before CPU goes offline
This commit is contained in:
Linus Torvalds 2025-10-19 04:59:43 -10:00
parent 343b4b44a1 17e3e88ed0
commit d9043c79ba
3 changed files with 18 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/sched/core.c
View File

@ -8571,10 +8571,12 @@ int sched_cpu_dying(unsigned int cpu)
sched_tick_stop(cpu);
rq_lock_irqsave(rq, &rf);
update_rq_clock(rq);
if (rq->nr_running != 1 || rq_has_pinned_tasks(rq)) {
WARN(true, "Dying CPU not properly vacated!");
dump_rq_tasks(rq, KERN_WARNING);
}
dl_server_stop(&rq->fair_server);
rq_unlock_irqrestore(rq, &rf);
calc_load_migrate(rq);

3
kernel/sched/deadline.c
View File

@ -1582,6 +1582,9 @@ void dl_server_start(struct sched_dl_entity *dl_se)
if (!dl_server(dl_se) || dl_se->dl_server_active)
return;
if (WARN_ON_ONCE(!cpu_online(cpu_of(rq))))
return;
dl_se->dl_server_active = 1;
enqueue_dl_entity(dl_se, ENQUEUE_WAKEUP);
if (!dl_task(dl_se->rq->curr) || dl_entity_preempt(dl_se, &rq->curr->dl))

12
kernel/sched/fair.c
View File

@ -8920,21 +8920,21 @@ pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf
return p;
idle:
if (!rf)
return NULL;
if (rf) {
new_tasks = sched_balance_newidle(rq, rf);
/*
* Because sched_balance_newidle() releases (and re-acquires) rq->lock, it is
* possible for any higher priority task to appear. In that case we
* must re-start the pick_next_entity() loop.
* Because sched_balance_newidle() releases (and re-acquires)
* rq->lock, it is possible for any higher priority task to
* appear. In that case we must re-start the pick_next_entity()
* loop.
*/
if (new_tasks < 0)
return RETRY_TASK;
if (new_tasks > 0)
goto again;
}
/*
* rq is about to be idle, check if we need to update the