From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Date: Tue, 23 Apr 2013 08:27:37 +0000 (+0900)
Subject: sched: Change position of resched_cpu() in load_balance()
X-Git-Tag: MMI-PSA29.97-13-9~14514^2~10
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f1cd0858100c67273f2c74344e0c464344c4a982;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

sched: Change position of resched_cpu() in load_balance()

cur_ld_moved is reset if env.flags hit LBF_NEED_BREAK.
So, there is possibility that we miss doing resched_cpu().
Correct it as changing position of resched_cpu()
before checking LBF_NEED_BREAK.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Tested-by: Jason Low <jason.low2@hp.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1366705662-3587-2-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1c977350e322..25aaf93281de 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5080,17 +5080,17 @@ more_balance:
 		double_rq_unlock(env.dst_rq, busiest);
 		local_irq_restore(flags);
 
-		if (env.flags & LBF_NEED_BREAK) {
-			env.flags &= ~LBF_NEED_BREAK;
-			goto more_balance;
-		}
-
 		/*
 		 * some other cpu did the load balance for us.
 		 */
 		if (cur_ld_moved && env.dst_cpu != smp_processor_id())
 			resched_cpu(env.dst_cpu);
 
+		if (env.flags & LBF_NEED_BREAK) {
+			env.flags &= ~LBF_NEED_BREAK;
+			goto more_balance;
+		}
+
 		/*
 		 * Revisit (affine) tasks on src_cpu that couldn't be moved to
 		 * us and move them to an alternate dst_cpu in our sched_group