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Thu, 11 Dec 2025 21:50:24 -0800 (PST) Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Fri, 12 Dec 2025 00:50:22 -0500 Message-Id: From: "Emil Tsalapatis" To: "Tejun Heo" , "Andrea Righi" , "Changwoo Min" , "David Vernet" Cc: , , Subject: Re: [PATCH 1/2] sched_ext: Factor out local_dsq_post_enq() from dispatch_enqueue() X-Mailer: aerc 0.20.1 References: <20251211224809.3383633-1-tj@kernel.org> <20251212014504.3431169-1-tj@kernel.org> <20251212014504.3431169-2-tj@kernel.org> In-Reply-To: <20251212014504.3431169-2-tj@kernel.org> 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 > Signed-off-by: Tejun Heo > --- Reviewed-by: Emil Tsalapatis > 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); > } > =20 > +static void local_dsq_post_enq(struct scx_dispatch_q *dsq, struct task_s= truct *p, > + u64 enq_flags) > +{ > + struct rq *rq =3D container_of(dsq, struct rq, scx.local_dsq); > + bool preempt =3D false; > + > + if ((enq_flags & SCX_ENQ_PREEMPT) && p !=3D rq->curr && > + rq->curr->sched_class =3D=3D &ext_sched_class) { > + rq->curr->scx.slice =3D 0; > + preempt =3D true; > + } > + > + if (preempt || sched_class_above(&ext_sched_class, rq->curr->sched_clas= s)) > + 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 *sc= h, struct scx_dispatch_q *dsq, > if (enq_flags & SCX_ENQ_CLEAR_OPSS) > atomic_long_set_release(&p->scx.ops_state, SCX_OPSS_NONE); > =20 > - if (is_local) { > - struct rq *rq =3D container_of(dsq, struct rq, scx.local_dsq); > - bool preempt =3D false; > - > - if ((enq_flags & SCX_ENQ_PREEMPT) && p !=3D rq->curr && > - rq->curr->sched_class =3D=3D &ext_sched_class) { > - rq->curr->scx.slice =3D 0; > - preempt =3D 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); > - } > } > =20 > static void task_unlink_from_dsq(struct task_struct *p,