On Tue 11-08-20 11:42:51, Uladzislau Rezki wrote: > On Tue, Aug 11, 2020 at 11:37:13AM +0200, Uladzislau Rezki wrote: > > On Tue, Aug 11, 2020 at 10:19:17AM +0200, Michal Hocko wrote: [...] > > > Anyway, if the zone->lock is not a good fit for raw_spin_lock then the > > > only way I can see forward is to detect real (RT) atomic contexts and > > > bail out early before taking the lock in the allocator for NOWAIT/ATOMIC > > > requests. > > > > This is similar what i have done with mm: Add __GFP_NO_LOCKS flag. I just > did it for order-0 pages(other paths are impossible) and made it common for > any kernel. > > Because when you say "bail out early" i suspect that we would like to check > the per-cpu-list cache. Bail out early means to do as much as possible until a raw non-compliant lock has to be taken. -- Michal Hocko SUSE Labs
