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sched: fix load scaling in group balancing 

doing the load balance will change cfs_rq->load.weight (that's the whole point)
but since that's part of the scale factor, we'll scale back with a different
amount.

Weight getting smaller would result in an inflated moved_load which causes
it to stop balancing too soon.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-06-27 13:41:29 +02:00 committed by Ingo Molnar
parent 408ed066b1
commit 42a3ac7d5c
1 changed files with 6 additions and 4 deletions
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10
kernel/sched_fair.c
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@ -1444,6 +1444,8 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
list_for_each_entry(tg, &task_groups, list) {
struct cfs_rq *busiest_cfs_rq = tg->cfs_rq[busiest_cpu];
unsigned long busiest_h_load = busiest_cfs_rq->h_load;
unsigned long busiest_weight = busiest_cfs_rq->load.weight;
long rem_load, moved_load;
/*
@ -1452,8 +1454,8 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
if (!busiest_cfs_rq->task_weight)
continue;
rem_load = rem_load_move * busiest_cfs_rq->load.weight;
rem_load /= busiest_cfs_rq->h_load + 1;
rem_load = rem_load_move * busiest_weight;
rem_load /= busiest_h_load + 1;
moved_load = __load_balance_fair(this_rq, this_cpu, busiest,
rem_load, sd, idle, all_pinned, this_best_prio,
@ -1462,8 +1464,8 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
if (!moved_load)
continue;
moved_load *= busiest_cfs_rq->h_load;
moved_load /= busiest_cfs_rq->load.weight + 1;
moved_load *= busiest_h_load;
moved_load /= busiest_weight + 1;
rem_load_move -= moved_load;
if (rem_load_move < 0)