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sched_ext: Avoid multiple irq_work_queue() calls in destroy_dsq()

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llist_add() returns true only when adding to an empty list, which indicates
that no IRQ work is currently queued or running. Therefore, we only need to
call irq_work_queue() when llist_add() returns true, to avoid unnecessarily
re-queueing IRQ work that is already pending or executing.

Signed-off-by: Zqiang <qiang.zhang@linux.dev>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Zqiang
2025-12-22 19:53:18 +08:00
committed by Tejun Heo
parent ccaeeb585c
commit 714d81423e
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/ext.c
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@@ -3439,8 +3439,8 @@ static void destroy_dsq(struct scx_sched *sch, u64 dsq_id)
* operations inside scheduler locks.
*/
dsq->id = SCX_DSQ_INVALID;
llist_add(&dsq->free_node, &dsqs_to_free);
irq_work_queue(&free_dsq_irq_work);
if (llist_add(&dsq->free_node, &dsqs_to_free))
irq_work_queue(&free_dsq_irq_work);
out_unlock_dsq:
raw_spin_unlock_irqrestore(&dsq->lock, flags);