On Thu Dec 11, 2025 at 8:45 PM EST, Tejun Heo wrote:
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 Signed-off-by: Tejun Heo tj@kernel.org
Reviewed-by: Emil Tsalapatis emil@etsalapatis.com
kernel/sched/ext.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-)
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index c4465ccefea4..c78efa99406f 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -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) { @@ -1093,22 +1109,10 @@ 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,