On 07/29, Kirill Tkhai wrote: > > How about this? Everything is inside task_rq_lock() now. The patch > became much less.
And with this change task_migrating() is not possible under task_rq_lock() or __task_rq_lock(). This means that 1/5 can be simplified too. __migrate_swap_task() is probably the notable exception... Off-topic, but it takes 2 ->pi_lock's. This means it can deadlock with try_to_wake_up_local() (if a 3rd process does ttwu() and waits for ->on_cpu == 0). But I guess __migrate_swap_task() should not play with PF_WQ_WORKER threads. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
