sched_ext: Introduce scx_bpf_dsq_reenq() for remote local DSQ reenqueue

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scx_bpf_reenqueue_local() can only trigger re-enqueue of the current CPU's
local DSQ. Introduce scx_bpf_dsq_reenq() which takes a DSQ ID and can target
any local DSQ including remote CPUs via SCX_DSQ_LOCAL_ON | cpu. This will be
expanded to support user DSQs by future changes.

scx_bpf_reenqueue_local() is reimplemented as a simple wrapper around
scx_bpf_dsq_reenq(SCX_DSQ_LOCAL, 0) and may be deprecated in the future.

Update compat.bpf.h with a compatibility shim and scx_qmap to test the new
functionality.

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 2026-03-07 05:29:49 -10:00

parent 0c4df54ad8

commit 9c34c5074d

4 changed files with 106 additions and 49 deletions

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118

kernel/sched/ext.c

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21

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

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11

tools/sched_ext/scx_qmap.bpf.c

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5

tools/sched_ext/scx_qmap.c

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