* [PATCH git-sched 1/3] no need for 'affine wakeup' balancing in select_task_rq_fair() when task_cpu(p) == this_cpu
@ 2007-12-09 18:36 Dmitry Adamushko
2007-12-10 8:37 ` Ingo Molnar
0 siblings, 1 reply; 2+ messages in thread
From: Dmitry Adamushko @ 2007-12-09 18:36 UTC (permalink / raw)
To: Ingo Molnar; +Cc: Steven Rostedt, Gregory Haskins, LKML Kernel
From: Dmitry Adamushko <dmitry.adamushko@gmail.com>
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>
---
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index f881fc5..2208692 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;
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2007-12-09 18:36 [PATCH git-sched 1/3] no need for 'affine wakeup' balancing in select_task_rq_fair() when task_cpu(p) == this_cpu Dmitry Adamushko
2007-12-10 8:37 ` Ingo Molnar
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