sched_ext: Add SCX_ENQ_IGNORE_CAPS for in-place restore

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A SAVE/RESTORE requeue re-inserts a running task in place and is immediately
followed by set_next_task_scx(). It is not a real scheduling event: the task
is already admitted to its cid and must return to the local DSQ
unconditionally.

scx_caps_for_enq() maps an enqueue to the cap its local-DSQ insert requires.
Add SCX_ENQ_IGNORE_CAPS, set it on the RESTORE-in-place branch of
enqueue_task_scx(), and have scx_caps_for_enq() require no caps for it, so
the cid admission gate never diverts an in-place restore to the reject DSQ.

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

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Tejun Heo 2026-07-13 22:18:43 -10:00

parent 75a8c8202c

commit 8b17523479

3 changed files with 9 additions and 2 deletions

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7

kernel/sched/ext/ext.c

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1

kernel/sched/ext/internal.h

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3

kernel/sched/ext/sub.h

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