linux/debian/patches-rt/0163-rcu-enable-rcu_normal_...

38 lines
1.5 KiB
Diff
Raw Normal View History

From 724541a3012567e4851d44a94795c42ce9fbc8ab Mon Sep 17 00:00:00 2001
From: Julia Cartwright <julia@ni.com>
Date: Wed, 12 Oct 2016 11:21:14 -0500
Subject: [PATCH 163/325] rcu: enable rcu_normal_after_boot by default for RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.115-rt48.tar.xz
The forcing of an expedited grace period is an expensive and very
RT-application unfriendly operation, as it forcibly preempts all running
tasks on CPUs which are preventing the gp from expiring.
By default, as a policy decision, disable the expediting of grace
periods (after boot) on configurations which enable PREEMPT_RT_FULL.
Suggested-by: Luiz Capitulino <lcapitulino@redhat.com>
2018-11-15 07:47:09 +00:00
Acked-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
2019-04-08 23:49:20 +00:00
kernel/rcu/update.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
2019-04-08 23:49:20 +00:00
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
2019-04-30 12:45:19 +00:00
index 6ffafb1b1584..16d8dba23329 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
2019-04-30 12:45:19 +00:00
@@ -68,7 +68,7 @@ extern int rcu_expedited; /* from sysctl */
module_param(rcu_expedited, int, 0);
extern int rcu_normal; /* from sysctl */
module_param(rcu_normal, int, 0);
-static int rcu_normal_after_boot;
+static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT_FULL);
module_param(rcu_normal_after_boot, int, 0);
#endif /* #ifndef CONFIG_TINY_RCU */
2020-01-03 23:36:11 +00:00
--
2020-04-09 19:44:24 +00:00
2.25.1
2020-01-03 23:36:11 +00:00