2018-08-27 14:32:32 +00:00
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From: Thomas Gleixner <tglx@linutronix.de>
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2019-04-08 23:49:20 +00:00
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Date: Mon, 6 Jun 2011 12:12:51 +0200
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2019-11-25 00:04:39 +00:00
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Subject: [PATCH 107/290] sched: Limit the number of task migrations per batch
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Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=c6286af6b5a433a8f97f2875f2cdcc7fb9614a9d
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2018-08-27 14:32:32 +00:00
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Put an upper limit on the number of tasks which are migrated per batch
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to avoid large latencies.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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2019-04-08 23:49:20 +00:00
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kernel/sched/core.c | 4 ++++
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2018-08-27 14:32:32 +00:00
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1 file changed, 4 insertions(+)
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2019-04-08 23:49:20 +00:00
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diff --git a/kernel/sched/core.c b/kernel/sched/core.c
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2019-11-25 00:04:39 +00:00
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index 86839f848805..de93941bad5a 100644
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2018-08-27 14:32:32 +00:00
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--- a/kernel/sched/core.c
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+++ b/kernel/sched/core.c
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2019-04-08 23:49:20 +00:00
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@@ -44,7 +44,11 @@ const_debug unsigned int sysctl_sched_features =
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2018-08-27 14:32:32 +00:00
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* Number of tasks to iterate in a single balance run.
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* Limited because this is done with IRQs disabled.
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*/
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2018-10-30 12:40:05 +00:00
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+#ifdef CONFIG_PREEMPT_RT_FULL
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2018-08-27 14:32:32 +00:00
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+const_debug unsigned int sysctl_sched_nr_migrate = 8;
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2018-10-30 12:40:05 +00:00
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+#else
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const_debug unsigned int sysctl_sched_nr_migrate = 32;
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2018-08-27 14:32:32 +00:00
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+#endif
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/*
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2018-10-30 12:40:05 +00:00
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* period over which we measure -rt task CPU usage in us.
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