sched_ext: Add scx_bpf_sub_kill() to evict a child sub-scheduler

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A cid-form scheduler can grant caps to and revoke them from its child
sub-schedulers but has no way to tear one down. Add scx_bpf_sub_kill() to
evict a direct child with a printf-style reason that reaches the child's
scx_exit_info. No exit code is taken because the child is a separate
scheduler whose exit-code semantics the parent cannot know. The child and
its subtree are disabled through the usual async path under a new exit kind,
SCX_EXIT_PARENT_KILL.

The bstr formatting infrastructure in ext.c is exposed through internal.h
with scx_ prefixes so the kfunc, which lives in sub.c, can format the
reason.

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 2026-07-13 22:18:44 -10:00

parent 75c268ed57

commit b0a2ca6ae0

4 changed files with 102 additions and 12 deletions

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28

kernel/sched/ext/ext.c

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11

kernel/sched/ext/internal.h

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57

kernel/sched/ext/sub.c

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18

tools/sched_ext/include/scx/common.bpf.h

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