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Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c8
-rw-r--r--kernel/sched/ext.c47
-rw-r--r--kernel/sched/ext.h2
-rw-r--r--kernel/sched/fair.c25
-rw-r--r--kernel/sched/sched.h36
-rw-r--r--kernel/sched/syscalls.c2
6 files changed, 86 insertions, 34 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index dbfb5717d6af..719e0ed1e976 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4711,7 +4711,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
if (rt_prio(p->prio)) {
p->sched_class = &rt_sched_class;
#ifdef CONFIG_SCHED_CLASS_EXT
- } else if (task_should_scx(p)) {
+ } else if (task_should_scx(p->policy)) {
p->sched_class = &ext_sched_class;
#endif
} else {
@@ -7025,7 +7025,7 @@ int default_wake_function(wait_queue_entry_t *curr, unsigned mode, int wake_flag
}
EXPORT_SYMBOL(default_wake_function);
-const struct sched_class *__setscheduler_class(struct task_struct *p, int prio)
+const struct sched_class *__setscheduler_class(int policy, int prio)
{
if (dl_prio(prio))
return &dl_sched_class;
@@ -7034,7 +7034,7 @@ const struct sched_class *__setscheduler_class(struct task_struct *p, int prio)
return &rt_sched_class;
#ifdef CONFIG_SCHED_CLASS_EXT
- if (task_should_scx(p))
+ if (task_should_scx(policy))
return &ext_sched_class;
#endif
@@ -7142,7 +7142,7 @@ void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task)
queue_flag &= ~DEQUEUE_MOVE;
prev_class = p->sched_class;
- next_class = __setscheduler_class(p, prio);
+ next_class = __setscheduler_class(p->policy, prio);
if (prev_class != next_class && p->se.sched_delayed)
dequeue_task(rq, p, DEQUEUE_SLEEP | DEQUEUE_DELAYED | DEQUEUE_NOCLOCK);
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 5900b06fd036..b5f4b1a5ae98 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -862,7 +862,8 @@ static DEFINE_MUTEX(scx_ops_enable_mutex);
DEFINE_STATIC_KEY_FALSE(__scx_ops_enabled);
DEFINE_STATIC_PERCPU_RWSEM(scx_fork_rwsem);
static atomic_t scx_ops_enable_state_var = ATOMIC_INIT(SCX_OPS_DISABLED);
-static atomic_t scx_ops_bypass_depth = ATOMIC_INIT(0);
+static int scx_ops_bypass_depth;
+static DEFINE_RAW_SPINLOCK(__scx_ops_bypass_lock);
static bool scx_ops_init_task_enabled;
static bool scx_switching_all;
DEFINE_STATIC_KEY_FALSE(__scx_switched_all);
@@ -4256,14 +4257,14 @@ static const struct kset_uevent_ops scx_uevent_ops = {
* Used by sched_fork() and __setscheduler_prio() to pick the matching
* sched_class. dl/rt are already handled.
*/
-bool task_should_scx(struct task_struct *p)
+bool task_should_scx(int policy)
{
if (!scx_enabled() ||
unlikely(scx_ops_enable_state() == SCX_OPS_DISABLING))
return false;
if (READ_ONCE(scx_switching_all))
return true;
- return p->policy == SCHED_EXT;
+ return policy == SCHED_EXT;
}
/**
@@ -4298,18 +4299,20 @@ bool task_should_scx(struct task_struct *p)
*/
static void scx_ops_bypass(bool bypass)
{
- int depth, cpu;
+ int cpu;
+ unsigned long flags;
+ raw_spin_lock_irqsave(&__scx_ops_bypass_lock, flags);
if (bypass) {
- depth = atomic_inc_return(&scx_ops_bypass_depth);
- WARN_ON_ONCE(depth <= 0);
- if (depth != 1)
- return;
+ scx_ops_bypass_depth++;
+ WARN_ON_ONCE(scx_ops_bypass_depth <= 0);
+ if (scx_ops_bypass_depth != 1)
+ goto unlock;
} else {
- depth = atomic_dec_return(&scx_ops_bypass_depth);
- WARN_ON_ONCE(depth < 0);
- if (depth != 0)
- return;
+ scx_ops_bypass_depth--;
+ WARN_ON_ONCE(scx_ops_bypass_depth < 0);
+ if (scx_ops_bypass_depth != 0)
+ goto unlock;
}
/*
@@ -4326,7 +4329,7 @@ static void scx_ops_bypass(bool bypass)
struct rq_flags rf;
struct task_struct *p, *n;
- rq_lock_irqsave(rq, &rf);
+ rq_lock(rq, &rf);
if (bypass) {
WARN_ON_ONCE(rq->scx.flags & SCX_RQ_BYPASSING);
@@ -4362,11 +4365,13 @@ static void scx_ops_bypass(bool bypass)
sched_enq_and_set_task(&ctx);
}
- rq_unlock_irqrestore(rq, &rf);
+ rq_unlock(rq, &rf);
/* resched to restore ticks and idle state */
resched_cpu(cpu);
}
+unlock:
+ raw_spin_unlock_irqrestore(&__scx_ops_bypass_lock, flags);
}
static void free_exit_info(struct scx_exit_info *ei)
@@ -4489,11 +4494,16 @@ static void scx_ops_disable_workfn(struct kthread_work *work)
scx_task_iter_start(&sti);
while ((p = scx_task_iter_next_locked(&sti))) {
const struct sched_class *old_class = p->sched_class;
+ const struct sched_class *new_class =
+ __setscheduler_class(p->policy, p->prio);
struct sched_enq_and_set_ctx ctx;
+ if (old_class != new_class && p->se.sched_delayed)
+ dequeue_task(task_rq(p), p, DEQUEUE_SLEEP | DEQUEUE_DELAYED);
+
sched_deq_and_put_task(p, DEQUEUE_SAVE | DEQUEUE_MOVE, &ctx);
- p->sched_class = __setscheduler_class(p, p->prio);
+ p->sched_class = new_class;
check_class_changing(task_rq(p), p, old_class);
sched_enq_and_set_task(&ctx);
@@ -5199,12 +5209,17 @@ static int scx_ops_enable(struct sched_ext_ops *ops, struct bpf_link *link)
scx_task_iter_start(&sti);
while ((p = scx_task_iter_next_locked(&sti))) {
const struct sched_class *old_class = p->sched_class;
+ const struct sched_class *new_class =
+ __setscheduler_class(p->policy, p->prio);
struct sched_enq_and_set_ctx ctx;
+ if (old_class != new_class && p->se.sched_delayed)
+ dequeue_task(task_rq(p), p, DEQUEUE_SLEEP | DEQUEUE_DELAYED);
+
sched_deq_and_put_task(p, DEQUEUE_SAVE | DEQUEUE_MOVE, &ctx);
p->scx.slice = SCX_SLICE_DFL;
- p->sched_class = __setscheduler_class(p, p->prio);
+ p->sched_class = new_class;
check_class_changing(task_rq(p), p, old_class);
sched_enq_and_set_task(&ctx);
diff --git a/kernel/sched/ext.h b/kernel/sched/ext.h
index 246019519231..b1675bb59fc4 100644
--- a/kernel/sched/ext.h
+++ b/kernel/sched/ext.h
@@ -18,7 +18,7 @@ bool scx_can_stop_tick(struct rq *rq);
void scx_rq_activate(struct rq *rq);
void scx_rq_deactivate(struct rq *rq);
int scx_check_setscheduler(struct task_struct *p, int policy);
-bool task_should_scx(struct task_struct *p);
+bool task_should_scx(int policy);
void init_sched_ext_class(void);
static inline u32 scx_cpuperf_target(s32 cpu)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c157d4860a3b..2d16c8545c71 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3369,7 +3369,7 @@ retry_pids:
vma = vma_next(&vmi);
}
- do {
+ for (; vma; vma = vma_next(&vmi)) {
if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) {
trace_sched_skip_vma_numa(mm, vma, NUMAB_SKIP_UNSUITABLE);
@@ -3491,7 +3491,7 @@ retry_pids:
*/
if (vma_pids_forced)
break;
- } for_each_vma(vmi, vma);
+ }
/*
* If no VMAs are remaining and VMAs were skipped due to the PID
@@ -5625,8 +5625,9 @@ pick_next_entity(struct rq *rq, struct cfs_rq *cfs_rq)
struct sched_entity *se = pick_eevdf(cfs_rq);
if (se->sched_delayed) {
dequeue_entities(rq, se, DEQUEUE_SLEEP | DEQUEUE_DELAYED);
- SCHED_WARN_ON(se->sched_delayed);
- SCHED_WARN_ON(se->on_rq);
+ /*
+ * Must not reference @se again, see __block_task().
+ */
return NULL;
}
return se;
@@ -7176,7 +7177,11 @@ static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags)
/* Fix-up what dequeue_task_fair() skipped */
hrtick_update(rq);
- /* Fix-up what block_task() skipped. */
+ /*
+ * Fix-up what block_task() skipped.
+ *
+ * Must be last, @p might not be valid after this.
+ */
__block_task(rq, p);
}
@@ -7193,12 +7198,14 @@ static bool dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
if (!(p->se.sched_delayed && (task_on_rq_migrating(p) || (flags & DEQUEUE_SAVE))))
util_est_dequeue(&rq->cfs, p);
- if (dequeue_entities(rq, &p->se, flags) < 0) {
- util_est_update(&rq->cfs, p, DEQUEUE_SLEEP);
+ util_est_update(&rq->cfs, p, flags & DEQUEUE_SLEEP);
+ if (dequeue_entities(rq, &p->se, flags) < 0)
return false;
- }
- util_est_update(&rq->cfs, p, flags & DEQUEUE_SLEEP);
+ /*
+ * Must not reference @p after dequeue_entities(DEQUEUE_DELAYED).
+ */
+
hrtick_update(rq);
return true;
}
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 081519ffab46..6c54a57275cc 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2769,8 +2769,6 @@ static inline void sub_nr_running(struct rq *rq, unsigned count)
static inline void __block_task(struct rq *rq, struct task_struct *p)
{
- WRITE_ONCE(p->on_rq, 0);
- ASSERT_EXCLUSIVE_WRITER(p->on_rq);
if (p->sched_contributes_to_load)
rq->nr_uninterruptible++;
@@ -2778,6 +2776,38 @@ static inline void __block_task(struct rq *rq, struct task_struct *p)
atomic_inc(&rq->nr_iowait);
delayacct_blkio_start();
}
+
+ ASSERT_EXCLUSIVE_WRITER(p->on_rq);
+
+ /*
+ * The moment this write goes through, ttwu() can swoop in and migrate
+ * this task, rendering our rq->__lock ineffective.
+ *
+ * __schedule() try_to_wake_up()
+ * LOCK rq->__lock LOCK p->pi_lock
+ * pick_next_task()
+ * pick_next_task_fair()
+ * pick_next_entity()
+ * dequeue_entities()
+ * __block_task()
+ * RELEASE p->on_rq = 0 if (p->on_rq && ...)
+ * break;
+ *
+ * ACQUIRE (after ctrl-dep)
+ *
+ * cpu = select_task_rq();
+ * set_task_cpu(p, cpu);
+ * ttwu_queue()
+ * ttwu_do_activate()
+ * LOCK rq->__lock
+ * activate_task()
+ * STORE p->on_rq = 1
+ * UNLOCK rq->__lock
+ *
+ * Callers must ensure to not reference @p after this -- we no longer
+ * own it.
+ */
+ smp_store_release(&p->on_rq, 0);
}
extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
@@ -3800,7 +3830,7 @@ static inline int rt_effective_prio(struct task_struct *p, int prio)
extern int __sched_setscheduler(struct task_struct *p, const struct sched_attr *attr, bool user, bool pi);
extern int __sched_setaffinity(struct task_struct *p, struct affinity_context *ctx);
-extern const struct sched_class *__setscheduler_class(struct task_struct *p, int prio);
+extern const struct sched_class *__setscheduler_class(int policy, int prio);
extern void set_load_weight(struct task_struct *p, bool update_load);
extern void enqueue_task(struct rq *rq, struct task_struct *p, int flags);
extern bool dequeue_task(struct rq *rq, struct task_struct *p, int flags);
diff --git a/kernel/sched/syscalls.c b/kernel/sched/syscalls.c
index 0470bcc3d204..24f9f90b6574 100644
--- a/kernel/sched/syscalls.c
+++ b/kernel/sched/syscalls.c
@@ -707,7 +707,7 @@ change:
}
prev_class = p->sched_class;
- next_class = __setscheduler_class(p, newprio);
+ next_class = __setscheduler_class(policy, newprio);
if (prev_class != next_class && p->se.sched_delayed)
dequeue_task(rq, p, DEQUEUE_SLEEP | DEQUEUE_DELAYED | DEQUEUE_NOCLOCK);
generated by cgit v1.2.3 (git 2.0.4) at 2026-01-30 13:31:48 +0000