From 01856635bb5753093014512e621834a3b13ab9a1 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 6 Jun 2011 12:12:51 +0200 Subject: [PATCH 130/352] sched: Limit the number of task migrations per batch 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 64ac7a2..412542f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -132,7 +132,11 @@ 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. */ +#ifndef CONFIG_PREEMPT_RT_FULL const_debug unsigned int sysctl_sched_nr_migrate = 32; +#else +const_debug unsigned int sysctl_sched_nr_migrate = 8; +#endif /* * period over which we average the RT time consumption, measured -- 2.7.4