Adding debian version 4.19.249-2.debian/4.19.249-2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/debian/patches-rt/0112-sched-Disable-TTWU_QUEUE-on-RT.patch b/debian/patches-rt/0112-sched-Disable-TTWU_QUEUE-on-RT.patch
new file mode 100644
index 000000000..8e44536b2
--- /dev/null
+++ b/debian/patches-rt/0112-sched-Disable-TTWU_QUEUE-on-RT.patch
@@ -0,0 +1,38 @@
+From 31cdcd445b6fbf09238e8e3a25c2dd72be0bb187 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Tue, 13 Sep 2011 16:42:35 +0200
+Subject: [PATCH 112/347] sched: Disable TTWU_QUEUE on RT
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+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 85ae8488039c..68de18405857 100644
+--- a/kernel/sched/features.h
++++ b/kernel/sched/features.h
+@@ -46,11 +46,16 @@ 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.
+-- 
+2.36.1
+