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Commit 9c217245 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

[PATCH] sched: move load-calculation functions 



move load-calculation functions so that they can use the per-policy
declarations and methods.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent cad60d93

kernel/sched.c

+66 −66
Original line number Diff line number Diff line
@@ -678,46 +678,6 @@ static void update_load_sub(struct load_weight *lw, unsigned long dec) 
	lw->inv_weight = 0;

}



static void __update_curr_load(struct rq *rq, struct load_stat *ls)

{

	if (rq->curr != rq->idle && ls->load.weight) {

		ls->delta_exec += ls->delta_stat;

		ls->delta_fair += calc_delta_fair(ls->delta_stat, &ls->load);

		ls->delta_stat = 0;

	}

}



/*

 * Update delta_exec, delta_fair fields for rq.

 *

 * delta_fair clock advances at a rate inversely proportional to

 * total load (rq->ls.load.weight) on the runqueue, while

 * delta_exec advances at the same rate as wall-clock (provided

 * cpu is not idle).

 *

 * delta_exec / delta_fair is a measure of the (smoothened) load on this

 * runqueue over any given interval. This (smoothened) load is used

 * during load balance.

 *

 * This function is called /before/ updating rq->ls.load

 * and when switching tasks.

 */

static void update_curr_load(struct rq *rq, u64 now)

{

	struct load_stat *ls = &rq->ls;

	u64 start;



	start = ls->load_update_start;

	ls->load_update_start = now;

	ls->delta_stat += now - start;

	/*

	 * Stagger updates to ls->delta_fair. Very frequent updates

	 * can be expensive.

	 */

	if (ls->delta_stat >= sysctl_sched_stat_granularity)

		__update_curr_load(rq, ls);

}



/*

 * To aid in avoiding the subversion of "niceness" due to uneven distribution

 * of tasks with abnormal "nice" values across CPUs the contribution that
@@ -768,32 +728,6 @@ static const u32 prio_to_wmult[40] = { 
/*  15 */ 119304647, 148102320, 186737708, 238609294, 286331153,

};



static inline void

inc_load(struct rq *rq, const struct task_struct *p, u64 now)

{

	update_curr_load(rq, now);

	update_load_add(&rq->ls.load, p->se.load.weight);

}



static inline void

dec_load(struct rq *rq, const struct task_struct *p, u64 now)

{

	update_curr_load(rq, now);

	update_load_sub(&rq->ls.load, p->se.load.weight);

}



static void inc_nr_running(struct task_struct *p, struct rq *rq, u64 now)

{

	rq->nr_running++;

	inc_load(rq, p, now);

}



static void dec_nr_running(struct task_struct *p, struct rq *rq, u64 now)

{

	rq->nr_running--;

	dec_load(rq, p, now);

}



static void activate_task(struct rq *rq, struct task_struct *p, int wakeup);



/*
@@ -824,6 +758,72 @@ static int balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest, 


#define sched_class_highest (&rt_sched_class)



static void __update_curr_load(struct rq *rq, struct load_stat *ls)

{

	if (rq->curr != rq->idle && ls->load.weight) {

		ls->delta_exec += ls->delta_stat;

		ls->delta_fair += calc_delta_fair(ls->delta_stat, &ls->load);

		ls->delta_stat = 0;

	}

}



/*

 * Update delta_exec, delta_fair fields for rq.

 *

 * delta_fair clock advances at a rate inversely proportional to

 * total load (rq->ls.load.weight) on the runqueue, while

 * delta_exec advances at the same rate as wall-clock (provided

 * cpu is not idle).

 *

 * delta_exec / delta_fair is a measure of the (smoothened) load on this

 * runqueue over any given interval. This (smoothened) load is used

 * during load balance.

 *

 * This function is called /before/ updating rq->ls.load

 * and when switching tasks.

 */

static void update_curr_load(struct rq *rq, u64 now)

{

	struct load_stat *ls = &rq->ls;

	u64 start;



	start = ls->load_update_start;

	ls->load_update_start = now;

	ls->delta_stat += now - start;

	/*

	 * Stagger updates to ls->delta_fair. Very frequent updates

	 * can be expensive.

	 */

	if (ls->delta_stat >= sysctl_sched_stat_granularity)

		__update_curr_load(rq, ls);

}



static inline void

inc_load(struct rq *rq, const struct task_struct *p, u64 now)

{

	update_curr_load(rq, now);

	update_load_add(&rq->ls.load, p->se.load.weight);

}



static inline void

dec_load(struct rq *rq, const struct task_struct *p, u64 now)

{

	update_curr_load(rq, now);

	update_load_sub(&rq->ls.load, p->se.load.weight);

}



static void inc_nr_running(struct task_struct *p, struct rq *rq, u64 now)

{

	rq->nr_running++;

	inc_load(rq, p, now);

}



static void dec_nr_running(struct task_struct *p, struct rq *rq, u64 now)

{

	rq->nr_running--;

	dec_load(rq, p, now);

}



static void set_load_weight(struct task_struct *p)

{

	task_rq(p)->cfs.wait_runtime -= p->se.wait_runtime;