Michal Hocko <mho...@kernel.org> writes: > Hi, > I've just noticed that alloc_gigantic_page ignores movability of the > gigantic page and it uses any existing zone. Considering that > hugepage_migration_supported only supports 2MB and pgd level hugepages > then 1GB pages are not migratable and as such allocating them from a > movable zone will break the basic expectation of this zone. Standard > hugetlb allocations try to avoid that by using htlb_alloc_mask and I > believe we should do the same for gigantic pages as well. > > I suspect this behavior is not intentional. What do you think about the > following untested patch?
I also noticed an unrelated issue with the usage of start_isolate_page_range. On error we set the migrate type to MIGRATE_MOVABLE. That may conflict with CMA pages ? Wondering whether we should check for page's pageblock migrate type in pfn_range_valid_gigantic() ? -aneesh
