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McKenney" , Metin Kaya , Xuewen Yan , K Prateek Nayak , Thomas Gleixner , Daniel Lezcano , kernel-team@android.com, Metin Kaya , John Stultz Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Connor O'Brien Switch logic that deactivates, sets the task cpu, and reactivates a task on a different rq to use a helper that will be later extended to push entire blocked task chains. This patch was broken out from a larger chain migration patch originally by Connor O'Brien. Cc: Joel Fernandes Cc: Qais Yousef Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Valentin Schneider Cc: Steven Rostedt Cc: Ben Segall Cc: Zimuzo Ezeozue Cc: Mel Gorman Cc: Will Deacon Cc: Waiman Long Cc: Boqun Feng Cc: "Paul E. McKenney" Cc: Metin Kaya Cc: Xuewen Yan Cc: K Prateek Nayak Cc: Thomas Gleixner Cc: Daniel Lezcano Cc: kernel-team@android.com Tested-by: K Prateek Nayak Tested-by: Metin Kaya Reviewed-by: Metin Kaya Reviewed-by: Valentin Schneider Reviewed-by: Qais Yousef Signed-off-by: Connor O'Brien [jstultz: split out from larger chain migration patch] Signed-off-by: John Stultz --- v8: * Renamed from push_task_chain to do_push_task so it makes more sense without proxy-execution v10: * Changed name to move_queued_task_locked as suggested by Valentin v11: * Also use new helper in __migrate_swap_task() and try_steal_cookie() as suggested by Qais Yousef * Nit cleanups suggested by Metin --- kernel/sched/core.c | 13 +++---------- kernel/sched/deadline.c | 8 ++------ kernel/sched/rt.c | 8 ++------ kernel/sched/sched.h | 12 ++++++++++++ 4 files changed, 19 insertions(+), 22 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f3951e4a55e5b..b2cc20ed14de6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2526,9 +2526,7 @@ int push_cpu_stop(void *arg) =20 // XXX validate p is still the highest prio task if (task_rq(p) =3D=3D rq) { - deactivate_task(rq, p, 0); - set_task_cpu(p, lowest_rq->cpu); - activate_task(lowest_rq, p, 0); + move_queued_task_locked(rq, lowest_rq, p); resched_curr(lowest_rq); } =20 @@ -3214,9 +3212,7 @@ static void __migrate_swap_task(struct task_struct *p= , int cpu) rq_pin_lock(src_rq, &srf); rq_pin_lock(dst_rq, &drf); =20 - deactivate_task(src_rq, p, 0); - set_task_cpu(p, cpu); - activate_task(dst_rq, p, 0); + move_queued_task_locked(src_rq, dst_rq, p); wakeup_preempt(dst_rq, p, 0); =20 rq_unpin_lock(dst_rq, &drf); @@ -6152,10 +6148,7 @@ static bool try_steal_cookie(int this, int that) if (sched_task_is_throttled(p, this)) goto next; =20 - deactivate_task(src, p, 0); - set_task_cpu(p, this); - activate_task(dst, p, 0); - + move_queued_task_locked(src, dst, p); resched_curr(dst); =20 success =3D true; diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index f59e5c19d9445..ac60d2819bd1d 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -2447,9 +2447,7 @@ static int push_dl_task(struct rq *rq) goto retry; } =20 - deactivate_task(rq, next_task, 0); - set_task_cpu(next_task, later_rq->cpu); - activate_task(later_rq, next_task, 0); + move_queued_task_locked(rq, later_rq, next_task); ret =3D 1; =20 resched_curr(later_rq); @@ -2535,9 +2533,7 @@ static void pull_dl_task(struct rq *this_rq) if (is_migration_disabled(p)) { push_task =3D get_push_task(src_rq); } else { - deactivate_task(src_rq, p, 0); - set_task_cpu(p, this_cpu); - activate_task(this_rq, p, 0); + move_queued_task_locked(src_rq, this_rq, p); dmin =3D p->dl.deadline; resched =3D true; } diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 310523c1b9e3f..496d3e6ab57d2 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -2105,9 +2105,7 @@ static int push_rt_task(struct rq *rq, bool pull) goto retry; } =20 - deactivate_task(rq, next_task, 0); - set_task_cpu(next_task, lowest_rq->cpu); - activate_task(lowest_rq, next_task, 0); + move_queued_task_locked(rq, lowest_rq, next_task); resched_curr(lowest_rq); ret =3D 1; =20 @@ -2378,9 +2376,7 @@ static void pull_rt_task(struct rq *this_rq) if (is_migration_disabled(p)) { push_task =3D get_push_task(src_rq); } else { - deactivate_task(src_rq, p, 0); - set_task_cpu(p, this_cpu); - activate_task(this_rq, p, 0); + move_queued_task_locked(src_rq, this_rq, p); resched =3D true; } /* diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 4c36cc6803617..d2cc31c2457e5 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -3575,6 +3575,18 @@ static inline void init_sched_mm_cid(struct task_str= uct *t) { } =20 extern u64 avg_vruntime(struct cfs_rq *cfs_rq); extern int entity_eligible(struct cfs_rq *cfs_rq, struct sched_entity *se); +#ifdef CONFIG_SMP +static inline +void move_queued_task_locked(struct rq *src_rq, struct rq *dst_rq, struct = task_struct *task) +{ + lockdep_assert_rq_held(src_rq); + lockdep_assert_rq_held(dst_rq); + + deactivate_task(src_rq, task, 0); + set_task_cpu(task, dst_rq->cpu); + activate_task(dst_rq, task, 0); +} +#endif =20 #ifdef CONFIG_RT_MUTEXES =20 --=20 2.46.0.76.ge559c4bf1a-goog