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sched_ext: Factor out local_dsq_post_enq() from dispatch_enqueue() 

Factor out local_dsq_post_enq() which performs post-enqueue handling for
local DSQs - triggering resched_curr() if SCX_ENQ_PREEMPT is specified or if
the current CPU is idle. No functional change.

This will be used by the next patch to fix move_local_task_to_local_dsq().

Cc: stable@vger.kernel.org # v6.12+
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
pull/1354/merge
Tejun Heo 2025-12-11 15:45:03 -10:00
parent 9f769637a9
commit 530b6637c7
1 changed files with 19 additions and 15 deletions
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34
kernel/sched/ext.c
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@ -982,6 +982,22 @@ static void refill_task_slice_dfl(struct scx_sched *sch, struct task_struct *p)
__scx_add_event(sch, SCX_EV_REFILL_SLICE_DFL, 1);
}
static void local_dsq_post_enq(struct scx_dispatch_q *dsq, struct task_struct *p,
u64 enq_flags)
{
struct rq *rq = container_of(dsq, struct rq, scx.local_dsq);
bool preempt = false;
if ((enq_flags & SCX_ENQ_PREEMPT) && p != rq->curr &&
rq->curr->sched_class == &ext_sched_class) {
rq->curr->scx.slice = 0;
preempt = true;
}
if (preempt || sched_class_above(&ext_sched_class, rq->curr->sched_class))
resched_curr(rq);
}
static void dispatch_enqueue(struct scx_sched *sch, struct scx_dispatch_q *dsq,
struct task_struct *p, u64 enq_flags)
{
@ -1093,23 +1109,11 @@ static void dispatch_enqueue(struct scx_sched *sch, struct scx_dispatch_q *dsq,
if (enq_flags & SCX_ENQ_CLEAR_OPSS)
atomic_long_set_release(&p->scx.ops_state, SCX_OPSS_NONE);
if (is_local) {
struct rq *rq = container_of(dsq, struct rq, scx.local_dsq);
bool preempt = false;
if ((enq_flags & SCX_ENQ_PREEMPT) && p != rq->curr &&
rq->curr->sched_class == &ext_sched_class) {
rq->curr->scx.slice = 0;
preempt = true;
}
if (preempt || sched_class_above(&ext_sched_class,
rq->curr->sched_class))
resched_curr(rq);
} else {
if (is_local)
local_dsq_post_enq(dsq, p, enq_flags);
else
raw_spin_unlock(&dsq->lock);
}
}
static void task_unlink_from_dsq(struct task_struct *p,
struct scx_dispatch_q *dsq)