diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2021-09-28 14:24:25 +0200 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2021-10-05 15:52:11 +0200 |
| commit | 691925f3ddccea832cf2d162dc277d2623a816e3 (patch) | |
| tree | b9c8a83cf7208a3bc1f18f726be956e6d579e5c9 /kernel/sched/core.c | |
| parent | sched: Move mmdrop to RCU on RT (diff) | |
| download | linux-dev-691925f3ddccea832cf2d162dc277d2623a816e3.tar.xz linux-dev-691925f3ddccea832cf2d162dc277d2623a816e3.zip | |
sched: Limit the number of task migrations per batch on RT
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
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 9eaeba671001..749284fc3c1f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -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. |