From: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Date: Fri, 25 Jan 2008 20:08:21 +0000 (+0100)
Subject: sched: no need for 'affine wakeup' balancing
X-Git-Tag: v2.6.25-rc1~1237^2~45
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ec3b77e11b9398ab40b492c4fde7d8aac04a718;p=linux-2.6

sched: no need for 'affine wakeup' balancing

No need to do a check for 'affine wakeup and passive balancing possibilities'
in select_task_rq_fair() when task_cpu(p) == this_cpu.

I guess, this part got missed upon introduction of per-sched_class
select_task_rq() in try_to_wake_up().

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index f881fc5e03..2208692dc4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -925,6 +925,9 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
 	this_cpu = smp_processor_id();
 	new_cpu  = cpu;
 
+	if (cpu == this_cpu)
+		goto out_set_cpu;
+
 	for_each_domain(this_cpu, sd) {
 		if (cpu_isset(cpu, sd->span)) {
 			this_sd = sd;