sched/deadline: Optimize sched_dl_global_validate()

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Under CONFIG_SMP, dl_bw is per root domain, but not per CPU.
When checking or updating dl_bw, currently iterating every CPU is
overdoing, just need iterate each root domain once.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Peng Liu <iwtbavbm@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Acked-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lkml.kernel.org/r/78d21ee792cc48ff79e8cd62a5f26208463684d6.1602171061.git.iwtbavbm@gmail.com

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Peng Liu 2020-10-08 23:48:46 +08:00 • committed by Peter Zijlstra

parent b9c88f7522

commit 26762423a2

3 changed files with 42 additions and 7 deletions

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39

kernel/sched/deadline.c

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9

kernel/sched/sched.h

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1

kernel/sched/topology.c

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