sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*()

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Change sched_class::wakeup_preempt() to also get called for
cross-class wakeups, specifically those where the woken task
is of a higher class than the previous highest class.

In order to do this, track the current highest class of the runqueue
in rq::next_class and have wakeup_preempt() track this upwards for
each new wakeup. Additionally have schedule() re-set the value on
pick.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20251127154725.901391274@infradead.org

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This commit is contained in:

Peter Zijlstra 2025-12-10 09:06:50 +01:00

parent 527a521029

commit 704069649b

8 changed files with 54 additions and 60 deletions

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32

kernel/sched/core.c

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14

kernel/sched/deadline.c

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9

kernel/sched/ext.c

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17

kernel/sched/fair.c

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3

kernel/sched/idle.c

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9

kernel/sched/rt.c

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27

kernel/sched/sched.h

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3

kernel/sched/stop_task.c

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