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The skip is real: an attach with an unchanged mask never reaches set_cpus_allowed_dl(), and the reservation is given back. Both setups you describe end at the wakeup, though. The task's old CPU is out of its mask, so migrate_task_rq_dl() moves the bandwidth when it leaves that CPU. A running task migrates before sched_setaffinity() returns. The lasting case comes from dl_task_check_affinity(). It tests the root domain of the CPU the task is on. A task moved asleep still sleeps in the root domain it left. So sched_setaffinity() can take it out of the root domain that counts it, and it then wakes on a CPU of its mask. The next version makes the affinity check use the CPU recorded with the bandwidth, and lets SCA_DL_BW_RESERVED skip the early exit. A new case, affinity_moved_asleep, fails on v5 and passes with the fix. Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com