sched_ext: Add the SCX_CAP_ENQ cap

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Add SCX_CAP_ENQ, which gates inserting tasks onto a cid's local DSQ. Unlike
IMMED enqueue, plain enqueues can pile up, so ENQ is the stronger cap and
implies ENQ_IMMED. Losing ENQ also triggers the reenq scan. The scan tests
each queued task and the running task against the cap each needs via
scx_caps_for_task(), so an ENQ-only loss reenqueues plain tasks, evicting a
running one, while IMMED tasks, which need only ENQ_IMMED, stay put.

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 46a85ae6fe

commit 701b7bcad8

3 changed files with 22 additions and 5 deletions

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kernel/sched/ext/ext.c

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14

kernel/sched/ext/internal.h

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12

kernel/sched/ext/sub.h

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