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McKenney" , Tim Chen Subject: [PATCH -tip 01/32] sched: Wrap rq::lock access Date: Tue, 17 Nov 2020 18:19:31 -0500 Message-Id: <20201117232003.3580179-2-joel@joelfernandes.org> X-Mailer: git-send-email 2.29.2.299.gdc1121823c-goog In-Reply-To: <20201117232003.3580179-1-joel@joelfernandes.org> References: <20201117232003.3580179-1-joel@joelfernandes.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. Tested-by: Julien Desfossez Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Vineeth Remanan Pillai Signed-off-by: Julien Desfossez Signed-off-by: Joel Fernandes (Google) --- kernel/sched/core.c | 68 ++++++++++++------------- kernel/sched/cpuacct.c | 12 ++--- kernel/sched/deadline.c | 22 ++++---- kernel/sched/debug.c | 4 +- kernel/sched/fair.c | 38 +++++++------- kernel/sched/idle.c | 4 +- kernel/sched/pelt.h | 2 +- kernel/sched/rt.c | 16 +++--- kernel/sched/sched.h | 108 +++++++++++++++++++++------------------- kernel/sched/topology.c | 4 +- 10 files changed, 141 insertions(+), 137 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index a6aaf9fb3400..db5cc05a68bc 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -186,12 +186,12 @@ 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(); @@ -210,7 +210,7 @@ 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() * @@ -232,7 +232,7 @@ 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))) @@ -302,7 +302,7 @@ 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; @@ -611,7 +611,7 @@ 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; @@ -635,10 +635,10 @@ 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 @@ -1137,7 +1137,7 @@ 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); @@ -1177,7 +1177,7 @@ 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)); /* * If sched_uclamp_used was enabled after task @p was enqueued, @@ -1807,7 +1807,7 @@ 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)); deactivate_task(rq, p, DEQUEUE_NOCLOCK); set_task_cpu(p, new_cpu); @@ -1973,7 +1973,7 @@ int push_cpu_stop(void *arg) struct task_struct *p = arg; raw_spin_lock_irq(&p->pi_lock); - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); if (task_rq(p) != rq) goto out_unlock; @@ -2003,7 +2003,7 @@ int push_cpu_stop(void *arg) out_unlock: rq->push_busy = false; - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); raw_spin_unlock_irq(&p->pi_lock); put_task_struct(p); @@ -2056,7 +2056,7 @@ __do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask, u32 * 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) @@ -2395,7 +2395,7 @@ 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. @@ -2941,7 +2941,7 @@ 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)); if (p->sched_contributes_to_load) rq->nr_uninterruptible--; @@ -3941,7 +3941,7 @@ static void do_balance_callbacks(struct rq *rq, struct callback_head *head) void (*func)(struct rq *rq); struct callback_head *next; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); while (head) { func = (void (*)(struct rq *))head->func; @@ -3957,7 +3957,7 @@ static inline struct callback_head *splice_balance_callbacks(struct rq *rq) { struct callback_head *head = rq->balance_callback; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); if (head) { rq->balance_callback = NULL; rq->balance_flags &= ~BALANCE_WORK; @@ -3976,9 +3976,9 @@ static inline void balance_callbacks(struct rq *rq, struct callback_head *head) unsigned long flags; if (unlikely(head)) { - raw_spin_lock_irqsave(&rq->lock, flags); + raw_spin_lock_irqsave(rq_lockp(rq), flags); do_balance_callbacks(rq, head); - raw_spin_unlock_irqrestore(&rq->lock, flags); + raw_spin_unlock_irqrestore(rq_lockp(rq), flags); } } @@ -4028,10 +4028,10 @@ 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 } @@ -4042,9 +4042,9 @@ 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_); + spin_acquire(&rq_lockp(rq)->dep_map, 0, 0, _THIS_IP_); balance_switch(rq); - raw_spin_unlock_irq(&rq->lock); + raw_spin_unlock_irq(rq_lockp(rq)); } /* @@ -5023,7 +5023,7 @@ static void __sched notrace __schedule(bool preempt) rq_unpin_lock(rq, &rf); __balance_callbacks(rq); - raw_spin_unlock_irq(&rq->lock); + raw_spin_unlock_irq(rq_lockp(rq)); } } @@ -5438,7 +5438,7 @@ void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task) rq_unpin_lock(rq, &rf); __balance_callbacks(rq); - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); preempt_enable(); } @@ -7020,7 +7020,7 @@ 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(); @@ -7058,7 +7058,7 @@ 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! */ @@ -7221,7 +7221,7 @@ static void balance_push(struct rq *rq) { struct task_struct *push_task = rq->curr; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); SCHED_WARN_ON(rq->cpu != smp_processor_id()); /* @@ -7242,9 +7242,9 @@ static void balance_push(struct rq *rq) */ if (!rq->nr_running && !rq_has_pinned_tasks(rq) && rcuwait_active(&rq->hotplug_wait)) { - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); rcuwait_wake_up(&rq->hotplug_wait); - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); } return; } @@ -7254,7 +7254,7 @@ static void balance_push(struct rq *rq) * Temporarily drop rq->lock such that we can wake-up the stop task. * Both preemption and IRQs are still disabled. */ - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); stop_one_cpu_nowait(rq->cpu, __balance_push_cpu_stop, push_task, this_cpu_ptr(&push_work)); /* @@ -7262,7 +7262,7 @@ static void balance_push(struct rq *rq) * schedule(). The next pick is obviously going to be the stop task * which is_per_cpu_kthread() and will push this task away. */ - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); } static void balance_push_set(int cpu, bool on) @@ -7682,7 +7682,7 @@ 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 941c28cf9738..38c1a68e91f0 100644 --- a/kernel/sched/cpuacct.c +++ b/kernel/sched/cpuacct.c @@ -112,7 +112,7 @@ 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) { @@ -126,7 +126,7 @@ 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; @@ -141,14 +141,14 @@ 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 } @@ -253,13 +253,13 @@ 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 2a5836f440e0..0f2ea0a3664c 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -135,7 +135,7 @@ 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); @@ -148,7 +148,7 @@ 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) @@ -162,7 +162,7 @@ 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 */ } @@ -172,7 +172,7 @@ 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) @@ -982,7 +982,7 @@ 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 @@ -1092,9 +1092,9 @@ 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); /* @@ -1746,7 +1746,7 @@ 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; @@ -1761,7 +1761,7 @@ 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) @@ -2306,10 +2306,10 @@ static void pull_dl_task(struct rq *this_rq) double_unlock_balance(this_rq, src_rq); if (push_task) { - raw_spin_unlock(&this_rq->lock); + raw_spin_unlock(rq_lockp(this_rq)); stop_one_cpu_nowait(src_rq->cpu, push_cpu_stop, push_task, &src_rq->push_work); - raw_spin_lock(&this_rq->lock); + raw_spin_lock(rq_lockp(this_rq)); } } diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 2357921580f9..60a922d3f46f 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -551,7 +551,7 @@ 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); @@ -559,7 +559,7 @@ 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 27536f37ba1a..52ddfec7cea6 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1110,7 +1110,7 @@ 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) @@ -5309,7 +5309,7 @@ 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) { @@ -5328,7 +5328,7 @@ 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) { @@ -6813,7 +6813,7 @@ 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 { @@ -7441,7 +7441,7 @@ 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; @@ -7539,7 +7539,7 @@ 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: @@ -7617,7 +7617,7 @@ 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); @@ -7633,7 +7633,7 @@ 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) { @@ -7669,7 +7669,7 @@ 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; @@ -7791,7 +7791,7 @@ 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); @@ -9726,7 +9726,7 @@ 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, @@ -9734,7 +9734,7 @@ 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; @@ -9750,7 +9750,7 @@ 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), @@ -10506,7 +10506,7 @@ 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 @@ -10515,7 +10515,7 @@ 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 */ @@ -10581,7 +10581,7 @@ static 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(); @@ -10619,7 +10619,7 @@ static 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; @@ -11095,9 +11095,9 @@ 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 df91b198a74c..50e128b899c4 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -422,10 +422,10 @@ 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 795e43e02afc..e850bd71a8ce 100644 --- a/kernel/sched/pelt.h +++ b/kernel/sched/pelt.h @@ -141,7 +141,7 @@ 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 dbe4629cf7ba..a6f9d132c24f 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -888,7 +888,7 @@ 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) { @@ -926,7 +926,7 @@ 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)) @@ -1894,10 +1894,10 @@ static int push_rt_task(struct rq *rq, bool pull) */ push_task = get_push_task(rq); if (push_task) { - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); stop_one_cpu_nowait(rq->cpu, push_cpu_stop, push_task, &rq->push_work); - raw_spin_lock(&rq->lock); + raw_spin_lock(rq_lockp(rq)); } return 0; @@ -2122,10 +2122,10 @@ 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)); while (push_rt_task(rq, true)) ; - raw_spin_unlock(&rq->lock); + raw_spin_unlock(rq_lockp(rq)); } raw_spin_lock(&rd->rto_lock); @@ -2243,10 +2243,10 @@ static void pull_rt_task(struct rq *this_rq) double_unlock_balance(this_rq, src_rq); if (push_task) { - raw_spin_unlock(&this_rq->lock); + raw_spin_unlock(rq_lockp(this_rq)); stop_one_cpu_nowait(src_rq->cpu, push_cpu_stop, push_task, &src_rq->push_work); - raw_spin_lock(&this_rq->lock); + raw_spin_lock(rq_lockp(this_rq)); } } diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 590e6f27068c..f794c9337047 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -896,7 +896,7 @@ DECLARE_STATIC_KEY_FALSE(sched_uclamp_used); */ struct rq { /* runqueue lock: */ - raw_spinlock_t lock; + raw_spinlock_t __lock; /* * nr_running and cpu_load should be in the same cacheline because @@ -1099,6 +1099,11 @@ static inline bool is_migration_disabled(struct task_struct *p) #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); @@ -1165,7 +1170,7 @@ 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; @@ -1173,7 +1178,7 @@ 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; @@ -1199,7 +1204,7 @@ static inline u64 rq_clock_thermal(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; } @@ -1209,7 +1214,7 @@ 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; } @@ -1238,7 +1243,7 @@ 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); @@ -1256,12 +1261,12 @@ 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 /* @@ -1282,7 +1287,7 @@ 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 @@ -1291,7 +1296,7 @@ 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); } @@ -1299,7 +1304,7 @@ 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); } @@ -1307,7 +1312,7 @@ 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); } @@ -1315,7 +1320,7 @@ 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); } @@ -1323,7 +1328,7 @@ 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); } @@ -1332,7 +1337,7 @@ 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 @@ -1340,7 +1345,7 @@ 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 @@ -1348,7 +1353,7 @@ 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 * @@ -1416,7 +1421,7 @@ 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 || (rq->balance_flags & BALANCE_PUSH))) return; @@ -1959,7 +1964,7 @@ static inline struct task_struct *get_push_task(struct rq *rq) { struct task_struct *p = rq->curr; - lockdep_assert_held(&rq->lock); + lockdep_assert_held(rq_lockp(rq)); if (rq->push_busy) return NULL; @@ -2167,7 +2172,7 @@ 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; @@ -2186,20 +2191,22 @@ 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 */ @@ -2209,11 +2216,7 @@ 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); } @@ -2221,8 +2224,9 @@ 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) @@ -2263,16 +2267,16 @@ 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); } } } @@ -2287,9 +2291,9 @@ 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); } @@ -2312,7 +2316,7 @@ 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 ;) */ } @@ -2327,7 +2331,7 @@ 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 90f3e5558fa2..82924db74ccb 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -454,7 +454,7 @@ 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; @@ -480,7 +480,7 @@ 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); -- 2.29.2.299.gdc1121823c-goog