On Fri, Jun 26, 2015 at 04:15:26AM +0200, Oleg Nesterov wrote: > wait_event()/wake_up_all() in stop_work_alloc/stop_work_free logic > is very suboptimal because of non-exclusive wakeups. So we add the > wait_queue_func_t alloc_wake() helper which wakes the waiter up only > a) if it actually waits for a stop_work in the "freed" cpumask, and > b) only after we already set ->stop_owner = waiter. > > So if 2 stop_machine()'s race with each other, the loser will likely > call schedule() only once and we will have a single wakeup.
So I think I can beat lockdep into submission (ugly but still) do we want to use an actual per-cpu mutex instead? -- 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/
