sched: fix shares boost logic

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>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index 6c5eb3bc37e0c0ab69fc5ba53d2293ca5a3ede52..1cff969f66463e8505386d4b4e5287bd852252ba 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1549,6 +1549,9 @@ tg_shares_up(struct task_group *tg, int cpu, struct sched_domain *sd)
        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;