Module advice 

fadvise advice values. These are the standard POSIX fadvise constants.

Constants

DONTNEED

Data won’t be needed soon (may be evicted from cache).

NOREUSE

Data will be accessed once (don’t keep in cache).

NORMAL

No special treatment (default).

RANDOM

Expect random access pattern.

SEQUENTIAL

Expect sequential access pattern.

WILLNEED

Data will be needed soon (trigger readahead).