[PATCH 25/30] sched: fix shares boost logic

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

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In case the domain is empty, pretend there is a single task on each cpu, so
that together with the boost logic we end up giving 1/n shares to each
cpu.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
---
 kernel/sched.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -1543,6 +1543,9 @@ tg_shares_up(struct task_group *tg, int 
 	if (!sd->parent || !(sd->parent->flags & SD_LOAD_BALANCE))
 		shares = tg->shares;
 
+	if (!rq_weight)
+		rq_weight = cpus_weight(sd->span) * NICE_0_LOAD;
+
 	for_each_cpu_mask(i, sd->span) {
 		struct rq *rq = cpu_rq(i);
 		unsigned long flags;

--