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sched: Set sched_nr_migrate back to 32 on RT for Android

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Android isn't a real-time userspace and has lots of processes, which makes
the normal sched_nr_migrate value of 32 more appealing. In addition,
there's no observed latency reduction from using a sched_nr_migrate value
of 8, probably because the shallowest idle state on mobile CPUs takes
longer to enter/exit than it takes for the scheduler to do a load balance
run, so our tail end latency is limited by cpuidle anyway.
This commit is contained in:
Sultan Alsawaf 2023-02-14 09:10:06 +00:00 • committed by Ksawlii
parent bc903594c9
commit 0b24a687cf
1 changed files with 4 additions and 0 deletions
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4
kernel/sched/core.c
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@ -80,7 +80,11 @@ EXPORT_SYMBOL_GPL(sysctl_sched_features);
* Number of tasks to iterate in a single balance run.
* Limited because this is done with IRQs disabled.
*/
#if !defined(CONFIG_ANDROID)
const_debug unsigned int sysctl_sched_nr_migrate = 32;
#else
const_debug unsigned int sysctl_sched_nr_migrate = 8;
#endif
/*
* period over which we measure -rt task CPU usage in us.