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sched: fix sched_domain aggregation

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Keeping the aggregate on the first cpu of the sched domain has two problems:
 - it could collide between different sched domains on different cpus
 - it could slow things down because of the remote accesses

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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 13:41:18 +02:00
committed by Ingo Molnar
parent 32df2ee86a
commit b6a86c746f
3 changed files with 60 additions and 66 deletions
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12
kernel/sched_fair.c
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@@ -1429,11 +1429,11 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
/*
* empty group
*/
if (!aggregate(tg, sd)->task_weight)
if (!aggregate(tg, this_cpu)->task_weight)
continue;
rem_load = rem_load_move * aggregate(tg, sd)->rq_weight;
rem_load /= aggregate(tg, sd)->load + 1;
rem_load = rem_load_move * aggregate(tg, this_cpu)->rq_weight;
rem_load /= aggregate(tg, this_cpu)->load + 1;
this_weight = tg->cfs_rq[this_cpu]->task_weight;
busiest_weight = tg->cfs_rq[busiest_cpu]->task_weight;
@@ -1451,10 +1451,10 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
if (!moved_load)
continue;
move_group_shares(tg, sd, busiest_cpu, this_cpu);
move_group_shares(tg, this_cpu, sd, busiest_cpu, this_cpu);
moved_load *= aggregate(tg, sd)->load;
moved_load /= aggregate(tg, sd)->rq_weight + 1;
moved_load *= aggregate(tg, this_cpu)->load;
moved_load /= aggregate(tg, this_cpu)->rq_weight + 1;
rem_load_move -= moved_load;
if (rem_load_move < 0)