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From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 6 Jun 2011 12:12:51 +0200
Subject: [PATCH 106/353] sched: Limit the number of task migrations per batch
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=8cce7045319b606fb508c6c135bc17fec1297dea
Put an upper limit on the number of tasks which are migrated per batch
to avoid large latencies.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/sched/core.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b307f7c8ce14..4425acb33942 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -44,7 +44,11 @@ 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_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.
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