sched: Optimize task_rq_lock()

Now that we hold the rq->lock over set_task_cpu() again, we can do
away with most of the TASK_WAKING checks and reduce them again to
set_cpus_allowed_ptr().

Removes some conditionals from scheduling hot-paths.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Oleg Nesterov <oleg@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 15 insertions, 8 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index dcd17736dae1..51d336e08a92 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -914,8 +914,8 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
 #endif /* __ARCH_WANT_UNLOCKED_CTXSW */
 
 /*
- * Check whether the task is waking, we use this to synchronize against
- * ttwu() so that task_cpu() reports a stable number.
+ * Check whether the task is waking, we use this to synchronize ->cpus_allowed
+ * against ttwu().
  */
 static inline int task_is_waking(struct task_struct *p)
 {
@@ -932,11 +932,9 @@ static inline struct rq *__task_rq_lock(struct task_struct *p)
         struct rq *rq;
 
         for (;;) {
-                while (task_is_waking(p))
-                        cpu_relax();
                 rq = task_rq(p);
                 raw_spin_lock(&rq->lock);
-                if (likely(rq == task_rq(p) && !task_is_waking(p)))
+                if (likely(rq == task_rq(p)))
                         return rq;
                 raw_spin_unlock(&rq->lock);
         }
@@ -953,12 +951,10 @@ static struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags)
         struct rq *rq;
 
         for (;;) {
-                while (task_is_waking(p))
-                        cpu_relax();
                 local_irq_save(*flags);
                 rq = task_rq(p);
                 raw_spin_lock(&rq->lock);
-                if (likely(rq == task_rq(p) && !task_is_waking(p)))
+                if (likely(rq == task_rq(p)))
                         return rq;
                 raw_spin_unlock_irqrestore(&rq->lock, *flags);
         }
@@ -5262,7 +5258,18 @@ int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
         struct rq *rq;
         int ret = 0;
 
+        /*
+         * Serialize against TASK_WAKING so that ttwu() and wunt() can
+         * drop the rq->lock and still rely on ->cpus_allowed.
+         */
+again:
+        while (task_is_waking(p))
+                cpu_relax();
         rq = task_rq_lock(p, &flags);
+        if (task_is_waking(p)) {
+                task_rq_unlock(rq, &flags);
+                goto again;
+        }
 
         if (!cpumask_intersects(new_mask, cpu_active_mask)) {
                 ret = -EINVAL;