en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/sched_ext/dequeue_remote.bpf.c#cc07fae1de5dbf514a9a3978050ee3cf5fe20d3c selftests/sched_ext: Add a test for ops.dequeue() on remote local DSQ movesAdd a dequeue_remote test that makes moves of tasks in the BPFscheduler's custody to another CPU's local DSQ the common case, both viaSCX_DSQ_LOCAL_ON dispatch and via scx_bpf_dsq_move_to_local(). The BPFscheduler tracks each task's custody state and triggers scx_bpf_error()if a custody period doesn't end with exactly one ops.dequeue() beforethe task runs, or if it ends with an SCX_DEQ_CORE_SCHED_EXEC dequeue ofa task without a core cookie.Without the previous patch, the test fails with: sched_ext: dequeue_remote: dequeue_remote.bpf.c:141: 15 (rcu_preempt): late ops.dequeue() with SCX_DEQ_CORE_SCHED_EXEC (enq_cpu=3 cpu=2 seq=1) ... ops_dequeue+0x114/0x170 set_next_task_scx+0x104/0x1e0 __pick_next_task+0xc7/0x180 __schedule+0x154/0x1870Reviewed-by: Andrea Righi <arighi@nvidia.com>Assisted-by: Claude:claude-opus-5.5Signed-off-by: Kuba Piecuch <jpiecuch@google.com>Signed-off-by: Tejun Heo <tj@kernel.org> List of files: /linux/tools/testing/selftests/sched_ext/dequeue_remote.bpf.c Wed, 30 Sep 2026 16:23:59 +0200 Kuba Piecuch <jpiecuch@google.com>