releases/2.6.32.3/sched-select_task_rq_fair-must-honour-sd_load_balance.patch

   1 From e4f4288842ee12747e10c354d72be7d424c0b627 Mon Sep 17 00:00:00 2001
   2 From: Peter Zijlstra <a.p.zijlstra@chello.nl>
   3 Date: Wed, 16 Dec 2009 18:04:34 +0100
   4 Subject: sched: Select_task_rq_fair() must honour SD_LOAD_BALANCE
   5
   6 From: Peter Zijlstra <a.p.zijlstra@chello.nl>
   7
   8 commit e4f4288842ee12747e10c354d72be7d424c0b627 upstream.
   9
  10 We should skip !SD_LOAD_BALANCE domains.
  11
  12 Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
  13 Cc: Mike Galbraith <efault@gmx.de>
  14 LKML-Reference: <20091216170517.653578430@chello.nl>
  15 Signed-off-by: Ingo Molnar <mingo@elte.hu>
  16 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  17
  18 ---
  19  kernel/sched_fair.c |    3 +++
  20  1 file changed, 3 insertions(+)
  21
  22 --- a/kernel/sched_fair.c
  23 +++ b/kernel/sched_fair.c
  24 @@ -1374,6 +1374,9 @@ static int select_task_rq_fair(struct ta
  25
  26         rcu_read_lock();
  27         for_each_domain(cpu, tmp) {
  28 +               if (!(tmp->flags & SD_LOAD_BALANCE))
  29 +                       continue;
  30 +
  31                 /*
  32                  * If power savings logic is enabled for a domain, see if we
  33                  * are not overloaded, if so, don't balance wider.