From nobody Sun Feb 8 14:32:30 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C74AEDEC51 for ; Wed, 13 Sep 2023 13:11:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240808AbjIMNLZ (ORCPT ); Wed, 13 Sep 2023 09:11:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240767AbjIMNLQ (ORCPT ); Wed, 13 Sep 2023 09:11:16 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9260519BB; Wed, 13 Sep 2023 06:11:12 -0700 (PDT) Date: Wed, 13 Sep 2023 13:11:10 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1694610671; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=K1u9XhqGdD8iDt6tL76z5B6EdFl2w7DNvw3G7mMcyyk=; b=gXZA4wC/8jjGIu2jay+Kq0xN+4E6ykuHTuNO+Rg1WwzbX97+5oYVCNNJXj3NxR/jFvfYAy wbdUsLztKCiCxKmywvw5KUxkiutQzbIaykxQOK+sjlacglVDosE4IAbfQ2rmMQvqQgW5wo kMOZcyWS/g1olPmw5MfJ2PNgYS3n7N92lvnQexWQOIETCltTXbOp7DJn2hsZEmGybhDuba 1kDnX5P/XkRUTYIf+ltRI3q98xPEFiU0Elo2N8Xnxb0agptb3w+ns5VVjSg1S+183LA2rP 9wV0O20QO7qnm7fCr6pm/kNTf5Y5CEBF/Jwx0YcsWwXBVv58Md7Q7g+j4xZJ3w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1694610671; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=K1u9XhqGdD8iDt6tL76z5B6EdFl2w7DNvw3G7mMcyyk=; b=xxHBIZ6rFBE+itkgLDAvW6oAlw+r06NVIh9sGrZLL3cLRJC6kn5JWC0VTsekGILXD74yX+ xDEkw6BIsSkqhoAQ== From: "tip-bot2 for Peter Zijlstra" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/core] sched: Simplify tg_set_cfs_bandwidth() Cc: "Peter Zijlstra (Intel)" , Ingo Molnar , x86@kernel.org, linux-kernel@vger.kernel.org MIME-Version: 1.0 Message-ID: <169461067069.27769.2758619210925283697.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the sched/core branch of tip: Commit-ID: 6fb45460615358157a6d3c990e74f9c1395247e2 Gitweb: https://git.kernel.org/tip/6fb45460615358157a6d3c990e74f9c13= 95247e2 Author: Peter Zijlstra AuthorDate: Fri, 09 Jun 2023 20:45:16 +02:00 Committer: Ingo Molnar CommitterDate: Wed, 13 Sep 2023 15:01:42 +02:00 sched: Simplify tg_set_cfs_bandwidth() Use guards to reduce gotos and simplify control flow. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar --- include/linux/cpu.h | 2 ++ kernel/sched/core.c | 38 +++++++++++++++++++------------------- 2 files changed, 21 insertions(+), 19 deletions(-) diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 0abd60a..f19f565 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -153,6 +153,8 @@ static inline int remove_cpu(unsigned int cpu) { return= -EPERM; } static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { } #endif /* !CONFIG_HOTPLUG_CPU */ =20 +DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock()) + #ifdef CONFIG_PM_SLEEP_SMP extern int freeze_secondary_cpus(int primary); extern void thaw_secondary_cpus(void); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index a3f4fb8..5d9f363 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -10802,11 +10802,12 @@ static int tg_set_cfs_bandwidth(struct task_group= *tg, u64 period, u64 quota, * Prevent race between setting of cfs_rq->runtime_enabled and * unthrottle_offline_cfs_rqs(). */ - cpus_read_lock(); - mutex_lock(&cfs_constraints_mutex); + guard(cpus_read_lock)(); + guard(mutex)(&cfs_constraints_mutex); + ret =3D __cfs_schedulable(tg, period, quota); if (ret) - goto out_unlock; + return ret; =20 runtime_enabled =3D quota !=3D RUNTIME_INF; runtime_was_enabled =3D cfs_b->quota !=3D RUNTIME_INF; @@ -10816,39 +10817,38 @@ static int tg_set_cfs_bandwidth(struct task_group= *tg, u64 period, u64 quota, */ if (runtime_enabled && !runtime_was_enabled) cfs_bandwidth_usage_inc(); - raw_spin_lock_irq(&cfs_b->lock); - cfs_b->period =3D ns_to_ktime(period); - cfs_b->quota =3D quota; - cfs_b->burst =3D burst; =20 - __refill_cfs_bandwidth_runtime(cfs_b); + scoped_guard (raw_spinlock_irq, &cfs_b->lock) { + cfs_b->period =3D ns_to_ktime(period); + cfs_b->quota =3D quota; + cfs_b->burst =3D burst; =20 - /* Restart the period timer (if active) to handle new period expiry: */ - if (runtime_enabled) - start_cfs_bandwidth(cfs_b); + __refill_cfs_bandwidth_runtime(cfs_b); =20 - raw_spin_unlock_irq(&cfs_b->lock); + /* + * Restart the period timer (if active) to handle new + * period expiry: + */ + if (runtime_enabled) + start_cfs_bandwidth(cfs_b); + } =20 for_each_online_cpu(i) { struct cfs_rq *cfs_rq =3D tg->cfs_rq[i]; struct rq *rq =3D cfs_rq->rq; - struct rq_flags rf; =20 - rq_lock_irq(rq, &rf); + guard(rq_lock_irq)(rq); cfs_rq->runtime_enabled =3D runtime_enabled; cfs_rq->runtime_remaining =3D 0; =20 if (cfs_rq->throttled) unthrottle_cfs_rq(cfs_rq); - rq_unlock_irq(rq, &rf); } + if (runtime_was_enabled && !runtime_enabled) cfs_bandwidth_usage_dec(); -out_unlock: - mutex_unlock(&cfs_constraints_mutex); - cpus_read_unlock(); =20 - return ret; + return 0; } =20 static int tg_set_cfs_quota(struct task_group *tg, long cfs_quota_us)