From: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Thu, 23 Aug 2007 13:18:02 +0000 (+0200)
Subject: sched: skip updating rq's next_balance under null SD
X-Git-Tag: v2.6.23-rc4~24^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f549da848eca595abca14ebc5e1bf00fd72aa53d;p=pandora-kernel.git

sched: skip updating rq's next_balance under null SD

Was playing with sched_smt_power_savings/sched_mc_power_savings and
found out that while the scheduler domains are reconstructed when sysfs
settings change, rebalance_domains() can get triggered with null domain
on other cpus, which is setting next_balance to jiffies + 60*HZ.
Resulting in no idle/busy balancing for 60 seconds.

Fix this.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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