Subject: sched: Limit the number of task migrations per batch From: Thomas Gleixner Date: Mon, 06 Jun 2011 12:12:51 +0200 Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.25-rt16.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(+) --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -44,7 +44,11 @@ const_debug unsigned int sysctl_sched_fe * Number of tasks to iterate in a single balance run. * Limited because this is done with IRQs disabled. */ +#ifdef CONFIG_PREEMPT_RT_FULL +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.