From nobody Fri Dec 19 07:28:11 2025 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D12FF1BC07B for ; Thu, 29 Aug 2024 22:52:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724971948; cv=none; b=WZ7DFHJGduLOGsTSFayn8V8Qy3esorDnLhSKnw6XSfmS89vfJ1v67TfFQCPaGj/tu/u/ucZ/11/MsdaHUB+lUOuFlCFzdsag+w0AJH3p1M7C4Ig7DdNT8VRcrvY6zS3L/ZXSBBLbHiuZ0qp0HeqFlu/YupS2JJ2/J1AMrt10Q3Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724971948; c=relaxed/simple; bh=0Mtn4B2ygEbVbvbv4Ga6pnXzqDvqnZiIZRiPIUhmQyc=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Ota7mM1ASTZpq1hXy+b5aDsB3TGRGxAtCbOb+71A5uK/kJOgKil4JYEfjYk8Mq/x2lx77l2vmVIcRAt6QF9A10ZjJJS+S2ZpOQPBa838e76p+0iDAnX783x6VXzgycCv2BDReQtOVHIQTJt8RwS2QBWvDoFDjIx/qiMGPag9ssA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jstultz.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=H4zYPede; arc=none smtp.client-ip=209.85.215.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jstultz.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="H4zYPede" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-7cd9ac1fa89so1083072a12.1 for ; Thu, 29 Aug 2024 15:52:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1724971945; x=1725576745; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=IRR2HIgyLbAjZIVHc7ojz+JZYJk0wDFUAOOiY2cOwPM=; b=H4zYPedec9Y5l12NC038SHeJtZVu50aB+x8MWUszjgZ/M24uqtl02p21Uh1ccgNf1/ +zBuI1dK3corjXvjt+hLrUru9Sri0zWCDBJYeRUVfuHifP8SeO6FeTlLxBS3hPJKqV+u KOkXAD2AAD7l9MPvNsIDdtyE5AVFM50Vn0Ab9nGR1wjvnLk8lUOjN87TBcMvmRXMVTD0 EDMTig0rGD4at0NUJubWaxbyz0/yrnwxDCmrYFdu4PoZFG6obyCiZka2beGGl5lg925c L7RpxZtJz3DsWwm7ZmBZex63LA9+5OyVRCvQ16C8FqJQXiD6vhaZ6nh8m/EMcf37Px8L Vf+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724971945; x=1725576745; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IRR2HIgyLbAjZIVHc7ojz+JZYJk0wDFUAOOiY2cOwPM=; b=IMP8cx5WoMKEEgj1ipxZkOnFbrnPPLHg9soIV82xjyXWR/QAsyGKsC7OBLPkOCJFV6 Z4gZyXLCl25uhHXpCj+i1JTro3Bqfbmgsb3Y0DjOFDjT1EL2cAR+mgD6nGPtA9j/mKAN 0RwbttXRNikVQq5LqUGv/KYtnMSQuDFTjgg7X0wv/aCGt5nsRElSmJKM+jF7fB6v4aAI MPCdHOQ/IqMeqfYQeVPA1+QPiFY8IA9A0Sx9qD7a7ggxkJQZrz2iXoHNsnQ0sJtU3sZa rf4qhfX1mkTzqEzxzoujm7tG0BQdcSm+H84hu0CkRR/d+eN6fFcKHtBXa/UoFxb08hWy y8TQ== X-Gm-Message-State: AOJu0YxdArYZ677dFfpbwNTo4qzOJbjLPEOiibbD9y3RoyQeKSLM9Nv3 PKDYzP651Y6kQ5EPzQgoFgZoAqsP/gvJ3bB8QVnASbn+AAPai6+lhbad7ABDk2JEb398IYAy6f+ 7Mq9TNAo7a/HRgPtnbRmRwAERWu4tlNDtFdrq/teu6ZPikZXP7bt+wFokr67fa69RTz9KjFbZxz 9B0S2OTQndCtlP/popfx+2lD/cB1DOv20YMtnwenqi3BP+ X-Google-Smtp-Source: AGHT+IHbq4TY2PgTDlAFlvuwBfueQPimW1WJsZnGqXS+4T3a6mHvH60LsK7GW0gBZZju6Fg/+oXhXRvavSXv X-Received: from jstultz-noogler2.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:600]) (user=jstultz job=sendgmr) by 2002:a17:902:f54e:b0:201:df0b:2b6e with SMTP id d9443c01a7336-2052764f72bmr220465ad.3.1724971944973; Thu, 29 Aug 2024 15:52:24 -0700 (PDT) Date: Thu, 29 Aug 2024 15:52:04 -0700 In-Reply-To: <20240829225212.6042-1-jstultz@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240829225212.6042-1-jstultz@google.com> X-Mailer: git-send-email 2.46.0.469.g59c65b2a67-goog Message-ID: <20240829225212.6042-5-jstultz@google.com> Subject: [RESEND][PATCH v12 4/7] sched: Add move_queued_task_locked helper From: John Stultz To: LKML Cc: "Connor O'Brien" , Joel Fernandes , Qais Yousef , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Valentin Schneider , Steven Rostedt , Ben Segall , Zimuzo Ezeozue , Mel Gorman , Will Deacon , Waiman Long , Boqun Feng , "Paul E. 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 2.46.0.469.g59c65b2a67-goog