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FromNikhil Rao <>
Subject[RFC][Patch 08/18] sched: update find_idlest_group() to use u64
DateWed, 20 Apr 2011 13:51:27 -0700
Update find_idlest_group() to use u64 to accumulate and maintain cpu_load
weights.

Signed-off-by: Nikhil Rao <ncrao@google.com>
---
kernel/sched_fair.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0b36548..029dd4f 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1527,11 +1527,11 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p,
int this_cpu, int load_idx)
{
struct sched_group *idlest = NULL, *group = sd->groups;
- unsigned long min_load = ULONG_MAX, this_load = 0;
+ u64 min_load = ULLONG_MAX, this_load = 0;
int imbalance = 100 + (sd->imbalance_pct-100)/2;

do {
- unsigned long load, avg_load;
+ u64 load, avg_load;
int local_group;
int i;

@@ -1557,7 +1557,8 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p,
}

/* Adjust by relative CPU power of the group */
- avg_load = (avg_load * SCHED_POWER_SCALE) / group->cpu_power;
+ avg_load *= SCHED_POWER_SCALE;
+ avg_load = div_u64(avg_load, group->cpu_power);

if (local_group) {
this_load = avg_load;
--
1.7.3.1


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