sched/fair: Avoid re-setting virtual deadline on 'migrations'

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During OSPM24 Youssef noted that migrations are re-setting the virtual
deadline. Notably everything that does a dequeue-enqueue, like setting
nice, changing preferred numa-node, and a myriad of other random crap,
will cause this to happen.

This shouldn't be. Preserve the relative virtual deadline across such
dequeue/enqueue cycles.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Tested-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lkml.kernel.org/r/20240727105030.625119246@infradead.org

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This commit is contained in:

Peter Zijlstra 2024-05-31 15:49:40 +02:00

parent fc1892becd

commit 82e9d0456e

3 changed files with 26 additions and 7 deletions

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6

include/linux/sched.h

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23

kernel/sched/fair.c

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4

kernel/sched/features.h

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