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Commit 3a5e4dc1 authored by Andi Kleen's avatar Andi Kleen Committed by Ingo Molnar
Browse files

sched: cleanup: refactor normalize_rt_tasks 



Replace a particularly ugly ifdef with an inline and a new macro.
Also split up the function to be easier to read.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 8cbbe86d

kernel/sched.c

+23 −20
Original line number Diff line number Diff line
@@ -75,6 +75,12 @@ unsigned long long __attribute__((weak)) sched_clock(void) 
	return (unsigned long long)jiffies * (1000000000 / HZ);

}



#ifdef CONFIG_SMP

#define is_migration_thread(p, rq) ((p) == (rq)->migration_thread)

#else

#define is_migration_thread(p, rq) 0

#endif



/*

 * Convert user-nice values [ -20 ... 0 ... 19 ]

 * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
@@ -6532,12 +6538,25 @@ EXPORT_SYMBOL(__might_sleep); 
#endif



#ifdef CONFIG_MAGIC_SYSRQ

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);

	__setscheduler(rq, p, SCHED_NORMAL, 0);

	if (on_rq) {

		activate_task(rq, p, 0);

		resched_task(rq->curr);

	}

}



void normalize_rt_tasks(void)

{

	struct task_struct *g, *p;

	unsigned long flags;

	struct rq *rq;

	int on_rq;



	read_lock_irq(&tasklist_lock);

	do_each_thread(g, p) {
@@ -6561,26 +6580,10 @@ void normalize_rt_tasks(void) 


		spin_lock_irqsave(&p->pi_lock, flags);

		rq = __task_rq_lock(p);

#ifdef CONFIG_SMP

		/*

		 * Do not touch the migration thread:

		 */

		if (p == rq->migration_thread)

			goto out_unlock;

#endif



		update_rq_clock(rq);

		on_rq = p->se.on_rq;

		if (on_rq)

			deactivate_task(rq, p, 0);

		__setscheduler(rq, p, SCHED_NORMAL, 0);

		if (on_rq) {

			activate_task(rq, p, 0);

			resched_task(rq->curr);

		}

#ifdef CONFIG_SMP

 out_unlock:

#endif

		if (!is_migration_thread(p, rq))

			normalize_task(rq, p);



		__task_rq_unlock(rq);

		spin_unlock_irqrestore(&p->pi_lock, flags);

	} while_each_thread(g, p);