From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94A0DC3F2D1 for ; Wed, 4 Mar 2020 17:00:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4338C24677 for ; Wed, 4 Mar 2020 17:00:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=digitalocean.com header.i=@digitalocean.com header.b="CzoS8CXG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388349AbgCDRAN (ORCPT ); Wed, 4 Mar 2020 12:00:13 -0500 Received: from mail-qk1-f193.google.com ([209.85.222.193]:37960 "EHLO mail-qk1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388332AbgCDRAK (ORCPT ); Wed, 4 Mar 2020 12:00:10 -0500 Received: by mail-qk1-f193.google.com with SMTP id j7so2065633qkd.5 for ; Wed, 04 Mar 2020 09:00:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=digitalocean.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=MZHIah7eqnIe7oV4wzFAy5oxQmQXmAfBOAVUunQbgDs=; b=CzoS8CXGgqJ6OHGiPEcx+1P5LLsEd5TlorytSCbXjGjXxCljZXZlhDLmqnhN17aGBo XcF2FmAANVjp6NVkjjimX8tgWLG/2W4c7apoXGnLASWGlmXxenTygy6otLd/yQe4laqD o9B5lUcny1um+2BbPUG9lZkmxzCpTCbPfAdbE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=MZHIah7eqnIe7oV4wzFAy5oxQmQXmAfBOAVUunQbgDs=; b=FSoGJKNNQWkaGV357S9qZPfIaJyKjGRHvs+r0uoDnsExCVWGRGeqY6LTrqmE4SxH3F OSLh04jISVmNK7RN+JmVElI2hDxNzmbt4RPSSjc2iCWS2V+gMh1NfRs+XtYziyRbQXTl d46crLCxY0NDhW4Y4seQ7UpvbdtpAqJth7u7u8+MAD6rTV1TB6ilZwE4eBVf2guTtC76 3RWstweSFcBxxy1T/GDKH7kFscOc/zj7q0kwK574UOK+b+++b/mBCcJNmyK4GJDBbqyc 5ee2keySYM70YctMkKPVZqiwlSYmTXIIvGvroz6Y/leco0BbzFxckOVyBn+sYnMoHCvx LaXw== X-Gm-Message-State: ANhLgQ3fWRc1PdR6q1KOaK1Zu6W+XUteRff47Qi7Ceqm67r8+G9Em0eb w7xbT5+csfQqxF5ytgBfYZtipA== X-Google-Smtp-Source: ADFU+vtQk+wQ493X0NqgdVX4EZIsDcIwj6woKASK+92cgHNPjQT9968FLiW3X48LgHHsdhcg8YNAfg== X-Received: by 2002:a37:6115:: with SMTP id v21mr3924652qkb.105.1583341207989; Wed, 04 Mar 2020 09:00:07 -0800 (PST) Received: from s2r5node9 ([162.243.188.99]) by smtp.gmail.com with ESMTPSA id v30sm6554094qte.93.2020.03.04.09.00.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Mar 2020 09:00:07 -0800 (PST) From: vpillai To: Nishanth Aravamudan , Julien Desfossez , Peter Zijlstra , Tim Chen , mingo@kernel.org, tglx@linutronix.de, pjt@google.com, torvalds@linux-foundation.org Cc: linux-kernel@vger.kernel.org, fweisbec@gmail.com, keescook@chromium.org, kerrnel@google.com, Phil Auld , Aaron Lu , Aubrey Li , aubrey.li@linux.intel.com, Valentin Schneider , Mel Gorman , Pawan Gupta , Paolo Bonzini , Joel Fernandes , joel@joelfernandes.org, Vineeth Remanan Pillai Subject: [RFC PATCH 01/13] sched: Wrap rq::lock access Date: Wed, 4 Mar 2020 16:59:51 +0000 Message-Id: <597946953f8df41f7f6d831a62d90523111b558a.1583332764.git.vpillai@digitalocean.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Zijlstra In preparation of playing games with rq->lock, abstract the thing using an accessor. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Vineeth Remanan Pillai Signed-off-by: Julien Desfossez --- kernel/sched/core.c | 46 +++++++++--------- kernel/sched/cpuacct.c | 12 ++--- kernel/sched/deadline.c | 18 +++---- kernel/sched/debug.c | 4 +- kernel/sched/fair.c | 38 +++++++-------- kernel/sched/idle.c | 4 +- kernel/sched/pelt.h | 2 +- kernel/sched/rt.c | 8 +-- kernel/sched/sched.h | 105 +++++++++++++++++++++------------------- kernel/sched/topology.c | 4 +- 10 files changed, 122 insertions(+), 119 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index b2564d62a0f7..28ba9b56dd8a 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -85,12 +85,12 @@ struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) for (;;) { rq = task_rq(p); - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) { rq_pin_lock(rq, rf); return rq; } - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); while (unlikely(task_on_rq_migrating(p))) cpu_relax(); @@ -109,7 +109,7 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) for (;;) { raw_spin_lock_irqsave(&p->pi_lock, rf->flags); rq = task_rq(p); - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); /* * move_queued_task() task_rq_lock() * @@ -131,7 +131,7 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) rq_pin_lock(rq, rf); return rq; } - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); while (unlikely(task_on_rq_migrating(p))) @@ -201,7 +201,7 @@ void update_rq_clock(struct rq *rq) { s64 delta; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); if (rq->clock_update_flags & RQCF_ACT_SKIP) return; @@ -510,7 +510,7 @@ void resched_curr(struct rq *rq) struct task_struct *curr = rq->curr; int cpu; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); if (test_tsk_need_resched(curr)) return; @@ -534,10 +534,10 @@ void resched_cpu(int cpu) struct rq *rq = cpu_rq(cpu); unsigned long flags; - raw_spin_lock_irqsave(&rq->lock, flags); + raw_spin_lock_irqsave(rq_lockp(rq), flags); if (cpu_online(cpu) || cpu == smp_processor_id()) resched_curr(rq); - raw_spin_unlock_irqrestore(&rq->lock, flags); + raw_spin_unlock_irqrestore(rq_lockp(rq), flags); } #ifdef CONFIG_SMP @@ -949,7 +949,7 @@ static inline void uclamp_rq_inc_id(struct rq *rq, struct task_struct *p, struct uclamp_se *uc_se = &p->uclamp[clamp_id]; struct uclamp_bucket *bucket; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); /* Update task effective clamp */ p->uclamp[clamp_id] = uclamp_eff_get(p, clamp_id); @@ -989,7 +989,7 @@ static inline void uclamp_rq_dec_id(struct rq *rq, struct task_struct *p, unsigned int bkt_clamp; unsigned int rq_clamp; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); bucket = &uc_rq->bucket[uc_se->bucket_id]; SCHED_WARN_ON(!bucket->tasks); @@ -1490,7 +1490,7 @@ static inline bool is_cpu_allowed(struct task_struct *p, int cpu) static struct rq *move_queued_task(struct rq *rq, struct rq_flags *rf, struct task_struct *p, int new_cpu) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); WRITE_ONCE(p->on_rq, TASK_ON_RQ_MIGRATING); dequeue_task(rq, p, DEQUEUE_NOCLOCK); @@ -1604,7 +1604,7 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) * Because __kthread_bind() calls this on blocked tasks without * holding rq->lock. */ - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); dequeue_task(rq, p, DEQUEUE_SAVE | DEQUEUE_NOCLOCK); } if (running) @@ -1736,7 +1736,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) * task_rq_lock(). */ WARN_ON_ONCE(debug_locks && !(lockdep_is_held(&p->pi_lock) || - lockdep_is_held(&task_rq(p)->lock))); + lockdep_is_held(rq_lockp(task_rq(p))))); #endif /* * Clearly, migrating tasks to offline CPUs is a fairly daft thing. @@ -2253,7 +2253,7 @@ ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags, { int en_flags = ENQUEUE_WAKEUP | ENQUEUE_NOCLOCK; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); #ifdef CONFIG_SMP if (p->sched_contributes_to_load) @@ -3107,10 +3107,10 @@ prepare_lock_switch(struct rq *rq, struct task_struct *next, struct rq_flags *rf * do an early lockdep release here: */ rq_unpin_lock(rq, rf); - spin_release(&rq->lock.dep_map, _THIS_IP_); + spin_release(&rq_lockp(rq)->dep_map, _THIS_IP_); #ifdef CONFIG_DEBUG_SPINLOCK /* this is a valid case when another task releases the spinlock */ - rq->lock.owner = next; + rq_lockp(rq)->owner = next; #endif } @@ -3121,8 +3121,8 @@ static inline void finish_lock_switch(struct rq *rq) * fix up the runqueue lock - which gets 'carried over' from * prev into current: */ - spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); - raw_spin_unlock_irq(&rq->lock); + spin_acquire(&rq_lockp(rq)->dep_map, 0, 0, _THIS_IP_); + raw_spin_unlock_irq(rq_lockp(rq)); } /* @@ -3272,7 +3272,7 @@ static void __balance_callback(struct rq *rq) void (*func)(struct rq *rq); unsigned long flags; - raw_spin_lock_irqsave(&rq->lock, flags); + raw_spin_lock_irqsave(rq_lockp(rq), flags); head = rq->balance_callback; rq->balance_callback = NULL; while (head) { @@ -3283,7 +3283,7 @@ static void __balance_callback(struct rq *rq) func(rq); } - raw_spin_unlock_irqrestore(&rq->lock, flags); + raw_spin_unlock_irqrestore(rq_lockp(rq), flags); } static inline void balance_callback(struct rq *rq) @@ -6033,7 +6033,7 @@ void init_idle(struct task_struct *idle, int cpu) __sched_fork(0, idle); raw_spin_lock_irqsave(&idle->pi_lock, flags); - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); idle->state = TASK_RUNNING; idle->se.exec_start = sched_clock(); @@ -6070,7 +6070,7 @@ void init_idle(struct task_struct *idle, int cpu) #ifdef CONFIG_SMP idle->on_cpu = 1; #endif - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); raw_spin_unlock_irqrestore(&idle->pi_lock, flags); /* Set the preempt count _outside_ the spinlocks! */ @@ -6632,7 +6632,7 @@ void __init sched_init(void) struct rq *rq; rq = cpu_rq(i); - raw_spin_lock_init(&rq->lock); + raw_spin_lock_init(&rq->__lock); rq->nr_running = 0; rq->calc_load_active = 0; rq->calc_load_update = jiffies + LOAD_FREQ; diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c index 9fbb10383434..78de28ebc45d 100644 --- a/kernel/sched/cpuacct.c +++ b/kernel/sched/cpuacct.c @@ -111,7 +111,7 @@ static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu, /* * Take rq->lock to make 64-bit read safe on 32-bit platforms. */ - raw_spin_lock_irq(&cpu_rq(cpu)->lock); + raw_spin_lock_irq(rq_lockp(cpu_rq(cpu))); #endif if (index == CPUACCT_STAT_NSTATS) { @@ -125,7 +125,7 @@ static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu, } #ifndef CONFIG_64BIT - raw_spin_unlock_irq(&cpu_rq(cpu)->lock); + raw_spin_unlock_irq(rq_lockp(cpu_rq(cpu))); #endif return data; @@ -140,14 +140,14 @@ static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val) /* * Take rq->lock to make 64-bit write safe on 32-bit platforms. */ - raw_spin_lock_irq(&cpu_rq(cpu)->lock); + raw_spin_lock_irq(rq_lockp(cpu_rq(cpu))); #endif for (i = 0; i < CPUACCT_STAT_NSTATS; i++) cpuusage->usages[i] = val; #ifndef CONFIG_64BIT - raw_spin_unlock_irq(&cpu_rq(cpu)->lock); + raw_spin_unlock_irq(rq_lockp(cpu_rq(cpu))); #endif } @@ -252,13 +252,13 @@ static int cpuacct_all_seq_show(struct seq_file *m, void *V) * Take rq->lock to make 64-bit read safe on 32-bit * platforms. */ - raw_spin_lock_irq(&cpu_rq(cpu)->lock); + raw_spin_lock_irq(rq_lockp(cpu_rq(cpu))); #endif seq_printf(m, " %llu", cpuusage->usages[index]); #ifndef CONFIG_64BIT - raw_spin_unlock_irq(&cpu_rq(cpu)->lock); + raw_spin_unlock_irq(rq_lockp(cpu_rq(cpu))); #endif } seq_puts(m, "\n"); diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 43323f875cb9..ded147f84382 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -80,7 +80,7 @@ void __add_running_bw(u64 dl_bw, struct dl_rq *dl_rq) { u64 old = dl_rq->running_bw; - lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock); + lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq))); dl_rq->running_bw += dl_bw; SCHED_WARN_ON(dl_rq->running_bw < old); /* overflow */ SCHED_WARN_ON(dl_rq->running_bw > dl_rq->this_bw); @@ -93,7 +93,7 @@ void __sub_running_bw(u64 dl_bw, struct dl_rq *dl_rq) { u64 old = dl_rq->running_bw; - lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock); + lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq))); dl_rq->running_bw -= dl_bw; SCHED_WARN_ON(dl_rq->running_bw > old); /* underflow */ if (dl_rq->running_bw > old) @@ -107,7 +107,7 @@ void __add_rq_bw(u64 dl_bw, struct dl_rq *dl_rq) { u64 old = dl_rq->this_bw; - lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock); + lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq))); dl_rq->this_bw += dl_bw; SCHED_WARN_ON(dl_rq->this_bw < old); /* overflow */ } @@ -117,7 +117,7 @@ void __sub_rq_bw(u64 dl_bw, struct dl_rq *dl_rq) { u64 old = dl_rq->this_bw; - lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock); + lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq))); dl_rq->this_bw -= dl_bw; SCHED_WARN_ON(dl_rq->this_bw > old); /* underflow */ if (dl_rq->this_bw > old) @@ -925,7 +925,7 @@ static int start_dl_timer(struct task_struct *p) ktime_t now, act; s64 delta; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); /* * We want the timer to fire at the deadline, but considering @@ -1035,9 +1035,9 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer) * If the runqueue is no longer available, migrate the * task elsewhere. This necessarily changes rq. */ - lockdep_unpin_lock(&rq->lock, rf.cookie); + lockdep_unpin_lock(rq_lockp(rq), rf.cookie); rq = dl_task_offline_migration(rq, p); - rf.cookie = lockdep_pin_lock(&rq->lock); + rf.cookie = lockdep_pin_lock(rq_lockp(rq)); update_rq_clock(rq); /* @@ -1652,7 +1652,7 @@ static void migrate_task_rq_dl(struct task_struct *p, int new_cpu __maybe_unused * from try_to_wake_up(). Hence, p->pi_lock is locked, but * rq->lock is not... So, lock it */ - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); if (p->dl.dl_non_contending) { sub_running_bw(&p->dl, &rq->dl); p->dl.dl_non_contending = 0; @@ -1667,7 +1667,7 @@ static void migrate_task_rq_dl(struct task_struct *p, int new_cpu __maybe_unused put_task_struct(p); } sub_rq_bw(&p->dl, &rq->dl); - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); } static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p) diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index f7e4579e746c..7e5f2237c7e4 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -498,7 +498,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", SPLIT_NS(cfs_rq->exec_clock)); - raw_spin_lock_irqsave(&rq->lock, flags); + raw_spin_lock_irqsave(rq_lockp(rq), flags); if (rb_first_cached(&cfs_rq->tasks_timeline)) MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime; last = __pick_last_entity(cfs_rq); @@ -506,7 +506,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) max_vruntime = last->vruntime; min_vruntime = cfs_rq->min_vruntime; rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime; - raw_spin_unlock_irqrestore(&rq->lock, flags); + raw_spin_unlock_irqrestore(rq_lockp(rq), flags); SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", SPLIT_NS(MIN_vruntime)); SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index ba749f579714..3b218753bf7a 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1091,7 +1091,7 @@ struct numa_group { static struct numa_group *deref_task_numa_group(struct task_struct *p) { return rcu_dereference_check(p->numa_group, p == current || - (lockdep_is_held(&task_rq(p)->lock) && !READ_ONCE(p->on_cpu))); + (lockdep_is_held(rq_lockp(task_rq(p))) && !READ_ONCE(p->on_cpu))); } static struct numa_group *deref_curr_numa_group(struct task_struct *p) @@ -5035,7 +5035,7 @@ static void __maybe_unused update_runtime_enabled(struct rq *rq) { struct task_group *tg; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); rcu_read_lock(); list_for_each_entry_rcu(tg, &task_groups, list) { @@ -5054,7 +5054,7 @@ static void __maybe_unused unthrottle_offline_cfs_rqs(struct rq *rq) { struct task_group *tg; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); rcu_read_lock(); list_for_each_entry_rcu(tg, &task_groups, list) { @@ -6438,7 +6438,7 @@ static void migrate_task_rq_fair(struct task_struct *p, int new_cpu) * In case of TASK_ON_RQ_MIGRATING we in fact hold the 'old' * rq->lock and can modify state directly. */ - lockdep_assert_held(&task_rq(p)->lock); + lockdep_assert_held(rq_lockp(task_rq(p))); detach_entity_cfs_rq(&p->se); } else { @@ -7066,7 +7066,7 @@ static int task_hot(struct task_struct *p, struct lb_env *env) { s64 delta; - lockdep_assert_held(&env->src_rq->lock); + lockdep_assert_held(rq_lockp(env->src_rq)); if (p->sched_class != &fair_sched_class) return 0; @@ -7160,7 +7160,7 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env) { int tsk_cache_hot; - lockdep_assert_held(&env->src_rq->lock); + lockdep_assert_held(rq_lockp(env->src_rq)); /* * We do not migrate tasks that are: @@ -7238,7 +7238,7 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env) */ static void detach_task(struct task_struct *p, struct lb_env *env) { - lockdep_assert_held(&env->src_rq->lock); + lockdep_assert_held(rq_lockp(env->src_rq)); deactivate_task(env->src_rq, p, DEQUEUE_NOCLOCK); set_task_cpu(p, env->dst_cpu); @@ -7254,7 +7254,7 @@ static struct task_struct *detach_one_task(struct lb_env *env) { struct task_struct *p; - lockdep_assert_held(&env->src_rq->lock); + lockdep_assert_held(rq_lockp(env->src_rq)); list_for_each_entry_reverse(p, &env->src_rq->cfs_tasks, se.group_node) { @@ -7290,7 +7290,7 @@ static int detach_tasks(struct lb_env *env) struct task_struct *p; int detached = 0; - lockdep_assert_held(&env->src_rq->lock); + lockdep_assert_held(rq_lockp(env->src_rq)); if (env->imbalance <= 0) return 0; @@ -7405,7 +7405,7 @@ static int detach_tasks(struct lb_env *env) */ static void attach_task(struct rq *rq, struct task_struct *p) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); BUG_ON(task_rq(p) != rq); activate_task(rq, p, ENQUEUE_NOCLOCK); @@ -9291,7 +9291,7 @@ static int load_balance(int this_cpu, struct rq *this_rq, if (need_active_balance(&env)) { unsigned long flags; - raw_spin_lock_irqsave(&busiest->lock, flags); + raw_spin_lock_irqsave(rq_lockp(busiest), flags); /* * Don't kick the active_load_balance_cpu_stop, @@ -9299,7 +9299,7 @@ static int load_balance(int this_cpu, struct rq *this_rq, * moved to this_cpu: */ if (!cpumask_test_cpu(this_cpu, busiest->curr->cpus_ptr)) { - raw_spin_unlock_irqrestore(&busiest->lock, + raw_spin_unlock_irqrestore(rq_lockp(busiest), flags); env.flags |= LBF_ALL_PINNED; goto out_one_pinned; @@ -9315,7 +9315,7 @@ static int load_balance(int this_cpu, struct rq *this_rq, busiest->push_cpu = this_cpu; active_balance = 1; } - raw_spin_unlock_irqrestore(&busiest->lock, flags); + raw_spin_unlock_irqrestore(rq_lockp(busiest), flags); if (active_balance) { stop_one_cpu_nowait(cpu_of(busiest), @@ -10058,7 +10058,7 @@ static void nohz_newidle_balance(struct rq *this_rq) time_before(jiffies, READ_ONCE(nohz.next_blocked))) return; - raw_spin_unlock(&this_rq->lock); + raw_spin_unlock(rq_lockp(this_rq)); /* * This CPU is going to be idle and blocked load of idle CPUs * need to be updated. Run the ilb locally as it is a good @@ -10067,7 +10067,7 @@ static void nohz_newidle_balance(struct rq *this_rq) */ if (!_nohz_idle_balance(this_rq, NOHZ_STATS_KICK, CPU_NEWLY_IDLE)) kick_ilb(NOHZ_STATS_KICK); - raw_spin_lock(&this_rq->lock); + raw_spin_lock(rq_lockp(this_rq)); } #else /* !CONFIG_NO_HZ_COMMON */ @@ -10133,7 +10133,7 @@ int newidle_balance(struct rq *this_rq, struct rq_flags *rf) goto out; } - raw_spin_unlock(&this_rq->lock); + raw_spin_unlock(rq_lockp(this_rq)); update_blocked_averages(this_cpu); rcu_read_lock(); @@ -10174,7 +10174,7 @@ int newidle_balance(struct rq *this_rq, struct rq_flags *rf) } rcu_read_unlock(); - raw_spin_lock(&this_rq->lock); + raw_spin_lock(rq_lockp(this_rq)); if (curr_cost > this_rq->max_idle_balance_cost) this_rq->max_idle_balance_cost = curr_cost; @@ -10647,9 +10647,9 @@ void unregister_fair_sched_group(struct task_group *tg) rq = cpu_rq(cpu); - raw_spin_lock_irqsave(&rq->lock, flags); + raw_spin_lock_irqsave(rq_lockp(rq), flags); list_del_leaf_cfs_rq(tg->cfs_rq[cpu]); - raw_spin_unlock_irqrestore(&rq->lock, flags); + raw_spin_unlock_irqrestore(rq_lockp(rq), flags); } } diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index ffa959e91227..f8653290de95 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -413,10 +413,10 @@ struct task_struct *pick_next_task_idle(struct rq *rq) static void dequeue_task_idle(struct rq *rq, struct task_struct *p, int flags) { - raw_spin_unlock_irq(&rq->lock); + raw_spin_unlock_irq(rq_lockp(rq)); printk(KERN_ERR "bad: scheduling from the idle thread!\n"); dump_stack(); - raw_spin_lock_irq(&rq->lock); + raw_spin_lock_irq(rq_lockp(rq)); } /* diff --git a/kernel/sched/pelt.h b/kernel/sched/pelt.h index afff644da065..6649cb63e32a 100644 --- a/kernel/sched/pelt.h +++ b/kernel/sched/pelt.h @@ -116,7 +116,7 @@ static inline void update_idle_rq_clock_pelt(struct rq *rq) static inline u64 rq_clock_pelt(struct rq *rq) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); assert_clock_updated(rq); return rq->clock_pelt - rq->lost_idle_time; diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index e591d40fd645..fc7d6706b209 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -846,7 +846,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun) if (skip) continue; - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); update_rq_clock(rq); if (rt_rq->rt_time) { @@ -884,7 +884,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun) if (enqueue) sched_rt_rq_enqueue(rt_rq); - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); } if (!throttled && (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)) @@ -2021,9 +2021,9 @@ void rto_push_irq_work_func(struct irq_work *work) * When it gets updated, a check is made if a push is possible. */ if (has_pushable_tasks(rq)) { - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); push_rt_tasks(rq); - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); } raw_spin_lock(&rd->rto_lock); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 280a3c735935..a306008a12f7 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -846,7 +846,7 @@ struct uclamp_rq { */ struct rq { /* runqueue lock: */ - raw_spinlock_t lock; + raw_spinlock_t __lock; /* * nr_running and cpu_load should be in the same cacheline because @@ -1026,6 +1026,10 @@ static inline int cpu_of(struct rq *rq) #endif } +static inline raw_spinlock_t *rq_lockp(struct rq *rq) +{ + return &rq->__lock; +} #ifdef CONFIG_SCHED_SMT extern void __update_idle_core(struct rq *rq); @@ -1093,7 +1097,7 @@ static inline void assert_clock_updated(struct rq *rq) static inline u64 rq_clock(struct rq *rq) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); assert_clock_updated(rq); return rq->clock; @@ -1101,7 +1105,7 @@ static inline u64 rq_clock(struct rq *rq) static inline u64 rq_clock_task(struct rq *rq) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); assert_clock_updated(rq); return rq->clock_task; @@ -1109,7 +1113,7 @@ static inline u64 rq_clock_task(struct rq *rq) static inline void rq_clock_skip_update(struct rq *rq) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); rq->clock_update_flags |= RQCF_REQ_SKIP; } @@ -1119,7 +1123,7 @@ static inline void rq_clock_skip_update(struct rq *rq) */ static inline void rq_clock_cancel_skipupdate(struct rq *rq) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); rq->clock_update_flags &= ~RQCF_REQ_SKIP; } @@ -1138,7 +1142,7 @@ struct rq_flags { static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf) { - rf->cookie = lockdep_pin_lock(&rq->lock); + rf->cookie = lockdep_pin_lock(rq_lockp(rq)); #ifdef CONFIG_SCHED_DEBUG rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP); @@ -1153,12 +1157,12 @@ static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf) rf->clock_update_flags = RQCF_UPDATED; #endif - lockdep_unpin_lock(&rq->lock, rf->cookie); + lockdep_unpin_lock(rq_lockp(rq), rf->cookie); } static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf) { - lockdep_repin_lock(&rq->lock, rf->cookie); + lockdep_repin_lock(rq_lockp(rq), rf->cookie); #ifdef CONFIG_SCHED_DEBUG /* @@ -1179,7 +1183,7 @@ static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf) __releases(rq->lock) { rq_unpin_lock(rq, rf); - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); } static inline void @@ -1188,7 +1192,7 @@ task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) __releases(p->pi_lock) { rq_unpin_lock(rq, rf); - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); } @@ -1196,7 +1200,7 @@ static inline void rq_lock_irqsave(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock) { - raw_spin_lock_irqsave(&rq->lock, rf->flags); + raw_spin_lock_irqsave(rq_lockp(rq), rf->flags); rq_pin_lock(rq, rf); } @@ -1204,7 +1208,7 @@ static inline void rq_lock_irq(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock) { - raw_spin_lock_irq(&rq->lock); + raw_spin_lock_irq(rq_lockp(rq)); rq_pin_lock(rq, rf); } @@ -1212,7 +1216,7 @@ static inline void rq_lock(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock) { - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); rq_pin_lock(rq, rf); } @@ -1220,7 +1224,7 @@ static inline void rq_relock(struct rq *rq, struct rq_flags *rf) __acquires(rq->lock) { - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); rq_repin_lock(rq, rf); } @@ -1229,7 +1233,7 @@ rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf) __releases(rq->lock) { rq_unpin_lock(rq, rf); - raw_spin_unlock_irqrestore(&rq->lock, rf->flags); + raw_spin_unlock_irqrestore(rq_lockp(rq), rf->flags); } static inline void @@ -1237,7 +1241,7 @@ rq_unlock_irq(struct rq *rq, struct rq_flags *rf) __releases(rq->lock) { rq_unpin_lock(rq, rf); - raw_spin_unlock_irq(&rq->lock); + raw_spin_unlock_irq(rq_lockp(rq)); } static inline void @@ -1245,7 +1249,7 @@ rq_unlock(struct rq *rq, struct rq_flags *rf) __releases(rq->lock) { rq_unpin_lock(rq, rf); - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); } static inline struct rq * @@ -1310,7 +1314,7 @@ queue_balance_callback(struct rq *rq, struct callback_head *head, void (*func)(struct rq *rq)) { - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); if (unlikely(head->next)) return; @@ -1994,7 +1998,7 @@ static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) __acquires(busiest->lock) __acquires(this_rq->lock) { - raw_spin_unlock(&this_rq->lock); + raw_spin_unlock(rq_lockp(this_rq)); double_rq_lock(this_rq, busiest); return 1; @@ -2013,20 +2017,22 @@ static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) __acquires(busiest->lock) __acquires(this_rq->lock) { - int ret = 0; - - if (unlikely(!raw_spin_trylock(&busiest->lock))) { - if (busiest < this_rq) { - raw_spin_unlock(&this_rq->lock); - raw_spin_lock(&busiest->lock); - raw_spin_lock_nested(&this_rq->lock, - SINGLE_DEPTH_NESTING); - ret = 1; - } else - raw_spin_lock_nested(&busiest->lock, - SINGLE_DEPTH_NESTING); + if (rq_lockp(this_rq) == rq_lockp(busiest)) + return 0; + + if (likely(raw_spin_trylock(rq_lockp(busiest)))) + return 0; + + if (rq_lockp(busiest) >= rq_lockp(this_rq)) { + raw_spin_lock_nested(rq_lockp(busiest), SINGLE_DEPTH_NESTING); + return 0; } - return ret; + + raw_spin_unlock(rq_lockp(this_rq)); + raw_spin_lock(rq_lockp(busiest)); + raw_spin_lock_nested(rq_lockp(this_rq), SINGLE_DEPTH_NESTING); + + return 1; } #endif /* CONFIG_PREEMPTION */ @@ -2036,11 +2042,7 @@ static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) */ static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) { - if (unlikely(!irqs_disabled())) { - /* printk() doesn't work well under rq->lock */ - raw_spin_unlock(&this_rq->lock); - BUG_ON(1); - } + lockdep_assert_irqs_disabled(); return _double_lock_balance(this_rq, busiest); } @@ -2048,8 +2050,9 @@ static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) __releases(busiest->lock) { - raw_spin_unlock(&busiest->lock); - lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); + if (rq_lockp(this_rq) != rq_lockp(busiest)) + raw_spin_unlock(rq_lockp(busiest)); + lock_set_subclass(&rq_lockp(this_rq)->dep_map, 0, _RET_IP_); } static inline void double_lock(spinlock_t *l1, spinlock_t *l2) @@ -2090,16 +2093,16 @@ static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) __acquires(rq2->lock) { BUG_ON(!irqs_disabled()); - if (rq1 == rq2) { - raw_spin_lock(&rq1->lock); + if (rq_lockp(rq1) == rq_lockp(rq2)) { + raw_spin_lock(rq_lockp(rq1)); __acquire(rq2->lock); /* Fake it out ;) */ } else { - if (rq1 < rq2) { - raw_spin_lock(&rq1->lock); - raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); + if (rq_lockp(rq1) < rq_lockp(rq2)) { + raw_spin_lock(rq_lockp(rq1)); + raw_spin_lock_nested(rq_lockp(rq2), SINGLE_DEPTH_NESTING); } else { - raw_spin_lock(&rq2->lock); - raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); + raw_spin_lock(rq_lockp(rq2)); + raw_spin_lock_nested(rq_lockp(rq1), SINGLE_DEPTH_NESTING); } } } @@ -2114,9 +2117,9 @@ static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) __releases(rq1->lock) __releases(rq2->lock) { - raw_spin_unlock(&rq1->lock); - if (rq1 != rq2) - raw_spin_unlock(&rq2->lock); + raw_spin_unlock(rq_lockp(rq1)); + if (rq_lockp(rq1) != rq_lockp(rq2)) + raw_spin_unlock(rq_lockp(rq2)); else __release(rq2->lock); } @@ -2139,7 +2142,7 @@ static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) { BUG_ON(!irqs_disabled()); BUG_ON(rq1 != rq2); - raw_spin_lock(&rq1->lock); + raw_spin_lock(rq_lockp(rq1)); __acquire(rq2->lock); /* Fake it out ;) */ } @@ -2154,7 +2157,7 @@ static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) __releases(rq2->lock) { BUG_ON(rq1 != rq2); - raw_spin_unlock(&rq1->lock); + raw_spin_unlock(rq_lockp(rq1)); __release(rq2->lock); } diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index dfb64c08a407..991accc492d8 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -442,7 +442,7 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd) struct root_domain *old_rd = NULL; unsigned long flags; - raw_spin_lock_irqsave(&rq->lock, flags); + raw_spin_lock_irqsave(rq_lockp(rq), flags); if (rq->rd) { old_rd = rq->rd; @@ -468,7 +468,7 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd) if (cpumask_test_cpu(rq->cpu, cpu_active_mask)) set_rq_online(rq); - raw_spin_unlock_irqrestore(&rq->lock, flags); + raw_spin_unlock_irqrestore(rq_lockp(rq), flags); if (old_rd) call_rcu(&old_rd->rcu, free_rootdomain); -- 2.17.1