Messages in this thread | | | Date | Fri, 24 Oct 2008 06:55:47 +0200 | From | Nick Piggin <> | Subject | Re: [RFC][PATCH] lru_add_drain_all() don't use schedule_on_each_cpu() |
| |
On Fri, Oct 24, 2008 at 01:54:46PM +0900, KOSAKI Motohiro wrote: > > > > > > Actually, schedule_on_each_cpu() is very problematic function. > > > it introduce the dependency of all worker on keventd_wq, > > > but we can't know what lock held by worker in kevend_wq because > > > keventd_wq is widely used out of kernel drivers too. > > > > > > So, the task of any lock held shouldn't wait on keventd_wq. > > > Its task should use own special purpose work queue. > > > > I don't see a better way to solve it, other than avoiding lru_add_drain_all > > Well, > > Unfortunately, lru_add_drain_all is also used some other VM place > (page migration and memory hotplug). > and page migration's usage is the same of this mlock usage. > (1. grab mmap_sem 2. call lru_add_drain_all) > > Then, change mlock usage isn't solution ;-)
No, not mlock alone.
| |