From a178dbd2a3f8eeedf39cde9582a29bc95f335b17 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 6 Jun 2011 12:12:51 +0200 Subject: [PATCH 214/323] sched: Limit the number of task migrations per batch Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz Put an upper limit on the number of tasks which are migrated per batch to avoid large latencies. Signed-off-by: Thomas Gleixner --- kernel/sched/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index aaeed4b14278..3d7e9ecbd376 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -65,7 +65,11 @@ const_debug unsigned int sysctl_sched_features = * Number of tasks to iterate in a single balance run. * Limited because this is done with IRQs disabled. */ +#ifdef CONFIG_PREEMPT_RT +const_debug unsigned int sysctl_sched_nr_migrate = 8; +#else const_debug unsigned int sysctl_sched_nr_migrate = 32; +#endif /* * period over which we measure -rt task CPU usage in us. -- 2.43.0