sched_ext: Split sub-scheduler implementation into sub.c

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The sub-scheduler implementation has grown and will continue to expand. Move
the sub-scheduler functions from ext.c into a new kernel/sched/ext/sub.c.
sub.h holds the prototypes and the !CONFIG_EXT_SUB_SCHED no-op stubs.

scx_dispatch_sched() is shared: balance_one() in ext.c and the
scx_bpf_sub_dispatch() kfunc in sub.c both call it, and the latter re-enters
it as sub-scheduler dispatch nests. It moves into sub.h as a static
__always_inline so both callers keep it inlined and per-level stack stays
bounded across the recursion. The event macros it uses move to internal.h.

No functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>

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This commit is contained in:

Tejun Heo 2026-07-01 10:28:48 -10:00

parent 305f86e8a7

commit daf8e166ba

5 changed files with 860 additions and 810 deletions

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2

kernel/sched/build_policy.c

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811

kernel/sched/ext/ext.c

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28

kernel/sched/ext/internal.h

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668

kernel/sched/ext/sub.c

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161

kernel/sched/ext/sub.h

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