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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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:04 +02:00
parent 19ccd97a03
commit 1091985b48
1 changed files with 5 additions and 4 deletions
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9
kernel/sched.c
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@ -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); 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->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->weight -= dec;
lw->inv_weight = 0; if (likely(lw->weight))
lw->inv_weight = WMULT_CONST / lw->weight;
} }
/* /*