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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-06-27 13:41:29 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-27 14:31:41 +0200
commit42a3ac7d5cee89849448b41b86faeb86f98e92f6 (patch)
treea601a02fd090b6da93b81ef9857133b8de7b5079
parent408ed066b11cf9ee4536573b4269ee3613bd735e (diff)
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>
-rw-r--r--kernel/sched_fair.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 865cb53a7cc..734e4c556fc 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -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)