1 MADV_NORMAL 2 MADV_RANDOM 3 MADV_SEQUENTIAL 4 MADV_WILLNEED 5 MADV_DONTNEED 6 MADV_FREE 7 MADV_REMOVE 8 MADV_DONTFORK 9 MADV_DOFORK 10 MADV_HWPOISON 11 MADV_SOFT_OFFLINE 12 MADV_MERGEABLE 13 MADV_UNMERGEABLE 14 MADV_HUGEPAGE 15 MADV_NOHUGEPAGE 16 MADV_DONTDUMP 17 MADV_DODUMP 18 MADV_WIPEONFORK 19 MADV_KEEPONFORK 20
