diff options
Diffstat (limited to 'features/rt/sched-Limit-the-number-of-task-migrations-per-batch.patch')
| -rw-r--r-- | features/rt/sched-Limit-the-number-of-task-migrations-per-batch.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/features/rt/sched-Limit-the-number-of-task-migrations-per-batch.patch b/features/rt/sched-Limit-the-number-of-task-migrations-per-batch.patch new file mode 100644 index 00000000..2acfbe0a --- /dev/null +++ b/features/rt/sched-Limit-the-number-of-task-migrations-per-batch.patch @@ -0,0 +1,32 @@ +From 8a4c33943f124f335c73fac2e3000c83073dd389 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Mon, 6 Jun 2011 12:12:51 +0200 +Subject: [PATCH 119/191] 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 <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 59fb8b18799f..aefac1f2e324 100644 +--- a/kernel/sched/core.c ++++ b/kernel/sched/core.c +@@ -64,7 +64,11 @@ 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. +-- +2.19.1 + |