| Subject: sched: Limit the number of task migrations per batch |
| From: Thomas Gleixner <tglx@linutronix.de> |
| Date: Mon, 06 Jun 2011 12:12:51 +0200 |
| |
| 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(+) |
| |
| --- a/kernel/sched/core.c |
| +++ b/kernel/sched/core.c |
| @@ -58,7 +58,11 @@ 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. |
| */ |
| +#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 |
