On Thu 22-11-18 10:15:57, Wei Yang wrote: > On Thu, Nov 22, 2018 at 06:12:41PM +0800, Wei Yang wrote: > >During online_pages phase, pgdat->nr_zones will be updated in case this > >zone is empty. > > > >Currently the online_pages phase is protected by the global lock > >mem_hotplug_begin(), which ensures there is no contention during the > >update of nr_zones. But this global lock introduces scalability issues. > > > >This patch is a preparation for removing the global lock during > >online_pages phase. Also this patch changes the documentation of > >node_size_lock to include the protectioin of nr_zones. I would just add that the patch moves init_currently_empty_zone under both zone_span_writelock and pgdat_resize_lock because both the pgdat state is changed (nr_zones) and the zone's start_pfn > > > >Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx> > > Missed this, if I am correct. :-) > > Acked-by: Michal Hocko <mhocko@xxxxxxxx> Yes, thank you. -- Michal Hocko SUSE Labs
