sched: Cleanup/optimize clock updates

Now that we no longer depend on the clock being updated prior to enqueueing
on migratory wakeup, we can clean up a bit, placing calls to update_rq_clock()
exactly where they are needed, ie on enqueue, dequeue and schedule events.

In the case of a freshly enqueued task immediately preempting, we can skip the
update during preemption, as the clock was just updated by the enqueue event.
We also save an unneeded call during a migratory wakeup by not updating the
previous runqueue, where update_curr() won't be invoked.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301199.6785.32.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index 68ed6f4..16559de 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -495,6 +495,8 @@ struct rq {
        u64 nohz_stamp;
        unsigned char in_nohz_recently;
 #endif
+       unsigned int skip_clock_update;
+
        /* capture load from *all* tasks on this cpu: */
        struct load_weight load;
        unsigned long nr_load_updates;
@@ -592,6 +594,13 @@ static inline
 void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags)
 {
        rq->curr->sched_class->check_preempt_curr(rq, p, flags);
+
+       /*
+        * A queue event has occurred, and we're going to schedule.  In
+        * this case, we can save a useless back to back clock update.
+        */
+       if (test_tsk_need_resched(p))
+               rq->skip_clock_update = 1;
 }
 
 static inline int cpu_of(struct rq *rq)
@@ -626,7 +635,8 @@ static inline int cpu_of(struct rq *rq)
 
 inline void update_rq_clock(struct rq *rq)
 {
-       rq->clock = sched_clock_cpu(cpu_of(rq));
+       if (!rq->skip_clock_update)
+               rq->clock = sched_clock_cpu(cpu_of(rq));
 }
 
 /*
@@ -1782,8 +1792,6 @@ static void double_rq_lock(struct rq *rq1, struct rq *rq2)
                        raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
                }
        }
-       update_rq_clock(rq1);
-       update_rq_clock(rq2);
 }
 
 /*
@@ -1880,6 +1888,7 @@ static void update_avg(u64 *avg, u64 sample)
 static void
 enqueue_task(struct rq *rq, struct task_struct *p, int wakeup, bool head)
 {
+       update_rq_clock(rq);
        sched_info_queued(p);
        p->sched_class->enqueue_task(rq, p, wakeup, head);
        p->se.on_rq = 1;
@@ -1887,6 +1896,7 @@ enqueue_task(struct rq *rq, struct task_struct *p, int wakeup, bool head)
 
 static void dequeue_task(struct rq *rq, struct task_struct *p, int sleep)
 {
+       update_rq_clock(rq);
        sched_info_dequeued(p);
        p->sched_class->dequeue_task(rq, p, sleep);
        p->se.on_rq = 0;
@@ -2366,7 +2376,6 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 
        smp_wmb();
        rq = task_rq_lock(p, &flags);
-       update_rq_clock(rq);
        if (!(p->state & state))
                goto out;
 
@@ -2407,7 +2416,6 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 
        rq = cpu_rq(cpu);
        raw_spin_lock(&rq->lock);
-       update_rq_clock(rq);
 
        /*
         * We migrated the task without holding either rq->lock, however
@@ -2624,7 +2632,6 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 
        BUG_ON(p->state != TASK_WAKING);
        p->state = TASK_RUNNING;
-       update_rq_clock(rq);
        activate_task(rq, p, 0);
        trace_sched_wakeup_new(rq, p, 1);
        check_preempt_curr(rq, p, WF_FORK);
@@ -3578,6 +3585,9 @@ static inline void schedule_debug(struct task_struct *prev)
 
 static void put_prev_task(struct rq *rq, struct task_struct *prev)
 {
+       if (prev->se.on_rq)
+               update_rq_clock(rq);
+       rq->skip_clock_update = 0;
        prev->sched_class->put_prev_task(rq, prev);
 }
 
@@ -3640,7 +3650,6 @@ need_resched_nonpreemptible:
                hrtick_clear(rq);
 
        raw_spin_lock_irq(&rq->lock);
-       update_rq_clock(rq);
        clear_tsk_need_resched(prev);
 
        if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
@@ -4197,7 +4206,6 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
        BUG_ON(prio < 0 || prio > MAX_PRIO);
 
        rq = task_rq_lock(p, &flags);
-       update_rq_clock(rq);
 
        oldprio = p->prio;
        prev_class = p->sched_class;
@@ -4240,7 +4248,6 @@ void set_user_nice(struct task_struct *p, long nice)
         * the task might be in the middle of scheduling on another CPU.
         */
        rq = task_rq_lock(p, &flags);
-       update_rq_clock(rq);
        /*
         * The RT priorities are set via sched_setscheduler(), but we still
         * allow the 'normal' nice value to be set - but as expected
@@ -4523,7 +4530,6 @@ recheck:
                raw_spin_unlock_irqrestore(&p->pi_lock, flags);
                goto recheck;
        }
-       update_rq_clock(rq);
        on_rq = p->se.on_rq;
        running = task_current(rq, p);
        if (on_rq)
@@ -5530,7 +5536,6 @@ void sched_idle_next(void)
 
        __setscheduler(rq, p, SCHED_FIFO, MAX_RT_PRIO-1);
 
-       update_rq_clock(rq);
        activate_task(rq, p, 0);
 
        raw_spin_unlock_irqrestore(&rq->lock, flags);
@@ -5585,7 +5590,6 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
        for ( ; ; ) {
                if (!rq->nr_running)
                        break;
-               update_rq_clock(rq);
                next = pick_next_task(rq);
                if (!next)
                        break;
@@ -5869,7 +5873,6 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                rq->migration_thread = NULL;
                /* Idle task back to normal (off runqueue, low prio) */
                raw_spin_lock_irq(&rq->lock);
-               update_rq_clock(rq);
                deactivate_task(rq, rq->idle, 0);
                __setscheduler(rq, rq->idle, SCHED_NORMAL, 0);
                rq->idle->sched_class = &idle_sched_class;
@@ -7815,7 +7818,6 @@ static void normalize_task(struct rq *rq, struct task_struct *p)
 {
        int on_rq;
 
-       update_rq_clock(rq);
        on_rq = p->se.on_rq;
        if (on_rq)
                deactivate_task(rq, p, 0);
@@ -8177,8 +8179,6 @@ void sched_move_task(struct task_struct *tsk)
 
        rq = task_rq_lock(tsk, &flags);
 
-       update_rq_clock(rq);
-
        running = task_current(rq, tsk);
        on_rq = tsk->se.on_rq;
 

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index c3b69d4..69e5820 100644 (file)
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -3064,8 +3064,6 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
 
        /* move a task from busiest_rq to target_rq */
        double_lock_balance(busiest_rq, target_rq);
-       update_rq_clock(busiest_rq);
-       update_rq_clock(target_rq);
 
        /* Search for an sd spanning us and the target CPU. */
        for_each_domain(target_cpu, sd) {