sched_ext: Implement scx_bpf_dsq_reenq() for user DSQs

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scx_bpf_dsq_reenq() currently only supports local DSQs. Extend it to support
user-defined DSQs by adding a deferred re-enqueue mechanism similar to the
local DSQ handling.

Add per-cpu deferred_reenq_user_node/flags to scx_dsq_pcpu and
deferred_reenq_users list to scx_rq. When scx_bpf_dsq_reenq() is called on a
user DSQ, the DSQ's per-cpu node is added to the current rq's deferred list.
process_deferred_reenq_users() then iterates the DSQ using the cursor helpers
and re-enqueues each task.

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 05:29:50 -10:00

parent 35250720d6

commit 84b1a0ea0b

4 changed files with 190 additions and 2 deletions

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6

include/linux/sched/ext.h

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128

kernel/sched/ext.c

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1

kernel/sched/sched.h

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57

tools/sched_ext/scx_qmap.bpf.c

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