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When a sub-scheduler dispatches a task to a CPU it lacks the required capability on, the task must be rejected rather than allowed to run. Add the machinery for that. Each rq gets a reject DSQ, a kernel-internal holding queue that is never run and that the BPF scheduler cannot reach. An insert that must be refused is diverted there instead of the local DSQ, and a deferred requeue then hands the parked tasks back to the BPF scheduler to re-decide. A cap revoke extends this to already-queued tasks. When the revoke reaches the cpu's effective caps, the cpu scans its local DSQ and reenqueues the tasks that no longer qualify. A migration-disabled task must run on its cpu, so a capless one is admitted anyway and counted in the new SCX_EV_SUB_FORCED_ADMIT event. This is preparation for the actual sub-sched cap enforcement. The divert is wired but inert here. v2: Admit offline-rq and migration_pending inserts to local, not reject. (sashiko AI) Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Andrea Righi <arighi@nvidia.com> |
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