[PATCH v3 15/19] sched: Fix migrate_disable() vs rt/dl balancing

From: Peter Zijlstra
Date: Thu Oct 15 2020 - 07:10:38 EST

In order to minimize the interference of migrate_disable() on lower
priority tasks, which can be deprived of runtime due to being stuck
below a higher priority task. Teach the RT/DL balancers to push away
these higher priority tasks when a lower priority task gets selected
to run on a freshly demoted CPU (pull).

This adds migration interference to the higher priority task, but
restores bandwidth to system that would otherwise be irrevocably lost.
Without this it would be possible to have all tasks on the system
stuck on a single CPU, each task preempted in a migrate_disable()
section with a single high priority task running.

This way we can still approximate running the M highest priority tasks
on the system.

Migrating the top task away is (ofcourse) still subject to
migrate_disable() too, which means the lower task is subject to an
interference equivalent to the worst case migrate_disable() section.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
include/linux/preempt.h | 38 +++++++++++++++------------
include/linux/sched.h | 3 +-
kernel/sched/core.c | 67 ++++++++++++++++++++++++++++++++++++++++--------
kernel/sched/deadline.c | 29 +++++++++++++++-----
kernel/sched/rt.c | 63 ++++++++++++++++++++++++++++++++++++---------
kernel/sched/sched.h | 32 ++++++++++++++++++++++
6 files changed, 185 insertions(+), 47 deletions(-)

--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -296,24 +296,28 @@ static inline void preempt_notifier_init
#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)

/*
- * Migrate-Disable and why it is (strongly) undesired.
+ * Migrate-Disable and why it is undesired.
*
- * The premise of the Real-Time schedulers we have on Linux
- * (SCHED_FIFO/SCHED_DEADLINE) is that M CPUs can/will run M tasks
- * concurrently, provided there are sufficient runnable tasks, also known as
- * work-conserving. For instance SCHED_DEADLINE tries to schedule the M
- * earliest deadline threads, and SCHED_FIFO the M highest priority threads.
- *
- * The correctness of various scheduling models depends on this, but is it
- * broken by migrate_disable() that doesn't imply preempt_disable(). Where
- * preempt_disable() implies an immediate priority ceiling, preemptible
- * migrate_disable() allows nesting.
- *
- * The worst case is that all tasks preempt one another in a migrate_disable()
- * region and stack on a single CPU. This then reduces the available bandwidth
- * to a single CPU. And since Real-Time schedulability theory considers the
- * Worst-Case only, all Real-Time analysis shall revert to single-CPU
- * (instantly solving the SMP analysis problem).
+ * When a preempted task becomes elegible to run under the ideal model (IOW it
+ * becomes one of the M highest priority tasks), it might still have to wait
+ * for the preemptee's migrate_disable() section to complete. Thereby suffering
+ * a reduction in bandwidth in the exact duration of the migrate_disable()
+ * section.
+ *
+ * Per this argument, the change from preempt_disable() to migrate_disable()
+ * gets us:
+ *
+ * - a higher priority tasks gains reduced wake-up latency; with preempt_disable()
+ * it would have had to wait for the lower priority task.
+ *
+ * - a lower priority tasks; which under preempt_disable() could've instantly
+ * migrated away when another CPU becomes available, is now constrained
+ * by the ability to push the higher priority task away, which might itself be
+ * in a migrate_disable() section, reducing it's available bandwidth.
+ *
+ * IOW it trades latency / moves the interference term, but it stays in the
+ * system, and as long as it remains unbounded, the system is not fully
+ * deterministic.
*
*
* The reason we have it anyway.
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -715,8 +715,9 @@ struct task_struct {
cpumask_t cpus_mask;
void *migration_pending;
#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)
- int migration_disabled;
+ unsigned short migration_disabled;
#endif
+ unsigned short migration_flags;

#ifdef CONFIG_PREEMPT_RCU
int rcu_read_lock_nesting;
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1763,11 +1763,6 @@ void migrate_enable(void)
}
EXPORT_SYMBOL_GPL(migrate_enable);

-static inline bool is_migration_disabled(struct task_struct *p)
-{
- return p->migration_disabled;
-}
-
static inline bool rq_has_pinned_tasks(struct rq *rq)
{
return rq->nr_pinned;
@@ -1913,6 +1908,49 @@ static int migration_cpu_stop(void *data
return 0;
}

+int push_cpu_stop(void *arg)
+{
+ struct rq *lowest_rq = NULL, *rq = this_rq();
+ struct task_struct *p = arg;
+
+ raw_spin_lock_irq(&p->pi_lock);
+ raw_spin_lock(&rq->lock);
+
+ if (task_rq(p) != rq)
+ goto out_unlock;
+
+ if (is_migration_disabled(p)) {
+ p->migration_flags |= MDF_PUSH;
+ goto out_unlock;
+ }
+
+ p->migration_flags &= ~MDF_PUSH;
+
+ if (p->sched_class->find_lock_rq)
+ lowest_rq = p->sched_class->find_lock_rq(p, rq);
+
+ if (!lowest_rq)
+ goto out_unlock;
+
+ // XXX validate p is still the highest prio task
+ if (task_rq(p) == rq) {
+ deactivate_task(rq, p, 0);
+ set_task_cpu(p, lowest_rq->cpu);
+ activate_task(lowest_rq, p, 0);
+ resched_curr(lowest_rq);
+ }
+
+ double_unlock_balance(rq, lowest_rq);
+
+out_unlock:
+ rq->push_busy = false;
+ raw_spin_unlock(&rq->lock);
+ raw_spin_unlock_irq(&p->pi_lock);
+
+ put_task_struct(p);
+ return 0;
+}
+
/*
* sched_class::set_cpus_allowed must do the below, but is not required to
* actually call this function.
@@ -2000,6 +2038,14 @@ static int affine_move_task(struct rq *r

/* Can the task run on the task's current CPU? If so, we're done */
if (cpumask_test_cpu(task_cpu(p), &p->cpus_mask)) {
+ struct task_struct *push_task = NULL;
+
+ if ((flags & SCA_MIGRATE_ENABLE) &&
+ (p->migration_flags & MDF_PUSH) && !rq->push_busy) {
+ rq->push_busy = true;
+ push_task = get_task_struct(p);
+ }
+
pending = p->migration_pending;
if (pending) {
p->migration_pending = NULL;
@@ -2007,6 +2053,11 @@ static int affine_move_task(struct rq *r
}
task_rq_unlock(rq, p, rf);

+ if (push_task) {
+ stop_one_cpu_nowait(rq->cpu, push_cpu_stop,
+ p, &rq->push_work);
+ }
+
if (complete)
goto do_complete;

@@ -2044,6 +2095,7 @@ static int affine_move_task(struct rq *r

if (flags & SCA_MIGRATE_ENABLE) {

+ p->migration_flags &= ~MDF_PUSH;
task_rq_unlock(rq, p, rf);
pending->arg = arg;
stop_one_cpu_nowait(cpu_of(rq), migration_cpu_stop,
@@ -2656,11 +2708,6 @@ static inline int __set_cpus_allowed_ptr

static inline void migrate_disable_switch(struct rq *rq, struct task_struct *p) { }

-static inline bool is_migration_disabled(struct task_struct *p)
-{
- return false;
-}
-
static inline bool rq_has_pinned_tasks(struct rq *rq)
{
return false;
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2129,6 +2129,9 @@ static int push_dl_task(struct rq *rq)
return 0;

retry:
+ if (is_migration_disabled(next_task))
+ return 0;
+
if (WARN_ON(next_task == rq->curr))
return 0;

@@ -2206,7 +2209,7 @@ static void push_dl_tasks(struct rq *rq)
static void pull_dl_task(struct rq *this_rq)
{
int this_cpu = this_rq->cpu, cpu;
- struct task_struct *p;
+ struct task_struct *p, *push_task;
bool resched = false;
struct rq *src_rq;
u64 dmin = LONG_MAX;
@@ -2236,6 +2239,7 @@ static void pull_dl_task(struct rq *this
continue;

/* Might drop this_rq->lock */
+ push_task = NULL;
double_lock_balance(this_rq, src_rq);

/*
@@ -2267,17 +2271,27 @@ static void pull_dl_task(struct rq *this
src_rq->curr->dl.deadline))
goto skip;

- resched = true;
-
- deactivate_task(src_rq, p, 0);
- set_task_cpu(p, this_cpu);
- activate_task(this_rq, p, 0);
- dmin = p->dl.deadline;
+ if (is_migration_disabled(p)) {
+ push_task = get_push_task(src_rq);
+ } else {
+ deactivate_task(src_rq, p, 0);
+ set_task_cpu(p, this_cpu);
+ activate_task(this_rq, p, 0);
+ dmin = p->dl.deadline;
+ resched = true;
+ }

/* Is there any other task even earlier? */
}
skip:
double_unlock_balance(this_rq, src_rq);
+
+ if (push_task) {
+ raw_spin_unlock(&this_rq->lock);
+ stop_one_cpu_nowait(src_rq->cpu, push_cpu_stop,
+ push_task, &src_rq->push_work);
+ raw_spin_lock(&this_rq->lock);
+ }
}

if (resched)
@@ -2524,6 +2538,7 @@ const struct sched_class dl_sched_class
.rq_online = rq_online_dl,
.rq_offline = rq_offline_dl,
.task_woken = task_woken_dl,
+ .find_lock_rq = find_lock_later_rq,
#endif

.task_tick = task_tick_dl,
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1859,7 +1859,7 @@ static struct task_struct *pick_next_pus
* running task can migrate over to a CPU that is running a task
* of lesser priority.
*/
-static int push_rt_task(struct rq *rq)
+static int push_rt_task(struct rq *rq, bool pull)
{
struct task_struct *next_task;
struct rq *lowest_rq;
@@ -1873,6 +1873,34 @@ static int push_rt_task(struct rq *rq)
return 0;

retry:
+ if (is_migration_disabled(next_task)) {
+ struct task_struct *push_task = NULL;
+ int cpu;
+
+ if (!pull || rq->push_busy)
+ return 0;
+
+ cpu = find_lowest_rq(rq->curr);
+ if (cpu == -1 || cpu == rq->cpu)
+ return 0;
+
+ /*
+ * Given we found a CPU with lower priority than @next_task,
+ * therefore it should be running. However we cannot migrate it
+ * to this other CPU, instead attempt to push the current
+ * running task on this CPU away.
+ */
+ push_task = get_push_task(rq);
+ if (push_task) {
+ raw_spin_unlock(&rq->lock);
+ stop_one_cpu_nowait(rq->cpu, push_cpu_stop,
+ push_task, &rq->push_work);
+ raw_spin_lock(&rq->lock);
+ }
+
+ return 0;
+ }
+
if (WARN_ON(next_task == rq->curr))
return 0;

@@ -1927,12 +1955,10 @@ static int push_rt_task(struct rq *rq)
deactivate_task(rq, next_task, 0);
set_task_cpu(next_task, lowest_rq->cpu);
activate_task(lowest_rq, next_task, 0);
- ret = 1;
-
resched_curr(lowest_rq);
+ ret = 1;

double_unlock_balance(rq, lowest_rq);
-
out:
put_task_struct(next_task);

@@ -1942,7 +1968,7 @@ static int push_rt_task(struct rq *rq)
static void push_rt_tasks(struct rq *rq)
{
/* push_rt_task will return true if it moved an RT */
- while (push_rt_task(rq))
+ while (push_rt_task(rq, false))
;
}

@@ -2095,7 +2121,8 @@ void rto_push_irq_work_func(struct irq_w
*/
if (has_pushable_tasks(rq)) {
raw_spin_lock(&rq->lock);
- push_rt_tasks(rq);
+ while (push_rt_task(rq, true))
+ ;
raw_spin_unlock(&rq->lock);
}

@@ -2120,7 +2147,7 @@ static void pull_rt_task(struct rq *this
{
int this_cpu = this_rq->cpu, cpu;
bool resched = false;
- struct task_struct *p;
+ struct task_struct *p, *push_task;
struct rq *src_rq;
int rt_overload_count = rt_overloaded(this_rq);

@@ -2167,6 +2194,7 @@ static void pull_rt_task(struct rq *this
* double_lock_balance, and another CPU could
* alter this_rq
*/
+ push_task = NULL;
double_lock_balance(this_rq, src_rq);

/*
@@ -2194,11 +2222,14 @@ static void pull_rt_task(struct rq *this
if (p->prio < src_rq->curr->prio)
goto skip;

- resched = true;
-
- deactivate_task(src_rq, p, 0);
- set_task_cpu(p, this_cpu);
- activate_task(this_rq, p, 0);
+ if (is_migration_disabled(p)) {
+ push_task = get_push_task(src_rq);
+ } else {
+ deactivate_task(src_rq, p, 0);
+ set_task_cpu(p, this_cpu);
+ activate_task(this_rq, p, 0);
+ resched = true;
+ }
/*
* We continue with the search, just in
* case there's an even higher prio task
@@ -2208,6 +2239,13 @@ static void pull_rt_task(struct rq *this
}
skip:
double_unlock_balance(this_rq, src_rq);
+
+ if (push_task) {
+ raw_spin_unlock(&this_rq->lock);
+ stop_one_cpu_nowait(src_rq->cpu, push_cpu_stop,
+ push_task, &src_rq->push_work);
+ raw_spin_lock(&this_rq->lock);
+ }
}

if (resched)
@@ -2449,6 +2487,7 @@ const struct sched_class rt_sched_class
.rq_offline = rq_offline_rt,
.task_woken = task_woken_rt,
.switched_from = switched_from_rt,
+ .find_lock_rq = find_lock_lowest_rq,
#endif

.task_tick = task_tick_rt,
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1057,6 +1057,8 @@ struct rq {
#if defined(CONFIG_PREEMPT_RT) && defined(CONFIG_SMP)
unsigned int nr_pinned;
#endif
+ unsigned int push_busy;
+ struct cpu_stop_work push_work;
};

#ifdef CONFIG_FAIR_GROUP_SCHED
@@ -1084,6 +1086,16 @@ static inline int cpu_of(struct rq *rq)
#endif
}

+#define MDF_PUSH 0x01
+
+static inline bool is_migration_disabled(struct task_struct *p)
+{
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)
+ return p->migration_disabled;
+#else
+ return false;
+#endif
+}

#ifdef CONFIG_SCHED_SMT
extern void __update_idle_core(struct rq *rq);
@@ -1816,6 +1828,8 @@ struct sched_class {

void (*rq_online)(struct rq *rq);
void (*rq_offline)(struct rq *rq);
+
+ struct rq *(*find_lock_rq)(struct task_struct *p, struct rq *rq);
#endif

void (*task_tick)(struct rq *rq, struct task_struct *p, int queued);
@@ -1911,6 +1925,24 @@ extern void trigger_load_balance(struct

extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask, u32 flags);

+static inline struct task_struct *get_push_task(struct rq *rq)
+{
+ struct task_struct *p = rq->curr;
+
+ lockdep_assert_held(&rq->lock);
+
+ if (rq->push_busy)
+ return NULL;
+
+ if (p->nr_cpus_allowed == 1)
+ return NULL;
+
+ rq->push_busy = true;
+ return get_task_struct(p);
+}
+
+extern int push_cpu_stop(void *arg);
+
#endif

#ifdef CONFIG_CPU_IDLE