On Thu 15-11-18 13:37:35, Andrew Morton wrote: [...] > Worse, the situations in which managed_zone() != populated_zone() are > rare(?), so it will take a long time for problems to be discovered, I > expect. We would basically have to deplete the whole zone by the bootmem allocator or pull out all pages from the page allocator. E.g. memory hotplug decreases both managed and present counters. I am actually not sure that is 100% correct (put on my TODO list to check). There is no consistency in that regards. That being said, I will review the patch (today hopefully) but fundamentally most users should indeed care about managed pages when iterating zones with memory. There should be a good reason why they might want to look at reserved pages. -- Michal Hocko SUSE Labs
