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Commit 1091985b authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: speed up update_load_add/_sub() 



speed up update_load_add/_sub() by not delaying the division - this
reduces CPU pipeline dependencies.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 19ccd97a

kernel/sched.c

+5 −4
Original line number Diff line number Diff line
@@ -697,16 +697,17 @@ calc_delta_fair(unsigned long delta_exec, struct load_weight *lw) 
	return calc_delta_mine(delta_exec, NICE_0_LOAD, lw);

}



static void update_load_add(struct load_weight *lw, unsigned long inc)

static inline void update_load_add(struct load_weight *lw, unsigned long inc)

{

	lw->weight += inc;

	lw->inv_weight = 0;

	lw->inv_weight = WMULT_CONST / lw->weight;

}



static void update_load_sub(struct load_weight *lw, unsigned long dec)

static inline void update_load_sub(struct load_weight *lw, unsigned long dec)

{

	lw->weight -= dec;

	lw->inv_weight = 0;

	if (likely(lw->weight))

		lw->inv_weight = WMULT_CONST / lw->weight;

}



/*