MADV_NORMAL
MADV_RANDOM
MADV_SEQUENTIAL
MADV_WILLNEED
MADV_DONTNEED
MADV_FREE
MADV_REMOVE
MADV_DONTFORK
MADV_DOFORK
MADV_HWPOISON
MADV_SOFT_OFFLINE
MADV_MERGEABLE
MADV_UNMERGEABLE
MADV_HUGEPAGE
MADV_NOHUGEPAGE
MADV_DONTDUMP
MADV_DODUMP
MADV_WIPEONFORK
MADV_KEEPONFORK