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sched: fix newidle smp group balancing

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Re-compute the shares on newidle - so we can make a decision based on
recent data.

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 13:41:24 +02:00 committed by Ingo Molnar
parent c8cba857b4
commit 3e5459b4be
1 changed files with 13 additions and 0 deletions
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13
kernel/sched.c
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@ -1579,6 +1579,13 @@ static void update_shares(struct sched_domain *sd)
walk_tg_tree(tg_nop, tg_shares_up, 0, sd);
}
static void update_shares_locked(struct rq *rq, struct sched_domain *sd)
{
spin_unlock(&rq->lock);
update_shares(sd);
spin_lock(&rq->lock);
}
static void update_h_load(int cpu)
{
walk_tg_tree(tg_load_down, tg_nop, cpu, NULL);
@ -1595,6 +1602,10 @@ static inline void update_shares(struct sched_domain *sd)
{
}
static inline void update_shares_locked(struct rq *rq, struct sched_domain *sd)
{
}
#endif
#endif
@ -3543,6 +3554,7 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
schedstat_inc(sd, lb_count[CPU_NEWLY_IDLE]);
redo:
update_shares_locked(this_rq, sd);
group = find_busiest_group(sd, this_cpu, &imbalance, CPU_NEWLY_IDLE,
&sd_idle, cpus, NULL);
if (!group) {
@ -3586,6 +3598,7 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
} else
sd->nr_balance_failed = 0;
update_shares_locked(this_rq, sd);
return ld_moved;
out_balanced: