2016-05-04 18:23 GMT+09:00 Michal Hocko <mho...@kernel.org>: > On Wed 04-05-16 11:35:00, Joonsoo Kim wrote: > [...] >> Oops... I think more deeply and change my mind. In recursion case, >> stack is consumed more than 1KB and it would be a problem. I think >> that best approach is using preallocated per cpu entry. It will also >> close recursion detection issue by paying interrupt on/off overhead. > > I was thinking about per-cpu solution as well but the thing is that the > stackdepot will allocate and until you drop __GFP_DIRECT_RECLAIM then > per-cpu is not safe. I haven't checked the implamentation of > depot_save_stack but I assume it will not schedule in other places.
I will think more. Thanks for review! Thanks.
