On Fri, Jul 15, 2016 at 10:47:06AM +0800, Xishi Qiu wrote: > alloc_migrate_target() is called from migrate_pages(), and the page > is always from user space, so we can add __GFP_HIGHMEM directly. No, all migratable pages are not from user space. For example, blockdev file cache has __GFP_MOVABLE and migratable but it has no __GFP_HIGHMEM and __GFP_USER. And, zram's memory isn't GFP_HIGHUSER_MOVABLE but has __GFP_MOVABLE. Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>