forked from rrcarlosr/Jetpack
38 lines
1.0 KiB
Diff
38 lines
1.0 KiB
Diff
|
From 249ad6800b5e950c188d5cd274ca62315bc0ee5e Mon Sep 17 00:00:00 2001
|
||
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
||
|
|
Date: Tue, 13 Sep 2011 16:42:35 +0200
|
||
|
|
Subject: [PATCH 139/352] sched: Disable TTWU_QUEUE on RT
|
||
|
|
|
||
|
|
The queued remote wakeup mechanism can introduce rather large
|
||
|
|
latencies if the number of migrated tasks is high. Disable it for RT.
|
||
|
|
|
||
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
||
|
|
---
|
||
|
|
kernel/sched/features.h | 5 +++++
|
||
|
|
1 file changed, 5 insertions(+)
|
||
|
|
|
||
|
|
diff --git a/kernel/sched/features.h b/kernel/sched/features.h
|
||
|
|
index d28c12e..24b2ede 100644
|
||
|
|
--- a/kernel/sched/features.h
|
||
|
|
+++ b/kernel/sched/features.h
|
||
|
|
@@ -45,11 +45,16 @@ SCHED_FEAT(LB_BIAS, true)
|
||
|
|
*/
|
||
|
|
SCHED_FEAT(NONTASK_CAPACITY, true)
|
||
|
|
|
||
|
|
+#ifdef CONFIG_PREEMPT_RT_FULL
|
||
|
|
+SCHED_FEAT(TTWU_QUEUE, false)
|
||
|
|
+#else
|
||
|
|
+
|
||
|
|
/*
|
||
|
|
* Queue remote wakeups on the target CPU and process them
|
||
|
|
* using the scheduler IPI. Reduces rq->lock contention/bounces.
|
||
|
|
*/
|
||
|
|
SCHED_FEAT(TTWU_QUEUE, true)
|
||
|
|
+#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* When doing wakeups, attempt to limit superfluous scans of the LLC domain.
|
||
|
|
--
|
||
|
|
2.7.4
|
||
|
|
|