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sched: Limit the number of task migrations per batch on RT

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Batched task migrations are a source for large latencies as they keep the
scheduler from running while processing the migrations.

Limit the batch size to 8 instead of 32 when running on a RT enabled
kernel.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210928122411.425097596@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-09-28 14:24:25 +02:00 committed by Peter Zijlstra
parent 8d491de6ed
commit 691925f3dd
1 changed files with 4 additions and 0 deletions
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4
kernel/sched/core.c
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@ -74,7 +74,11 @@ __read_mostly int sysctl_resched_latency_warn_once = 1;
* 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.