Enum Advice

#[non_exhaustive]
#[repr(u32)]
pub enum Advice {
    Normal = 0,
    Sequential = 2,
    Random = 1,
    WillNeed = 3,
    LinuxDontNeed = 4,
    LinuxFree = 8,
    LinuxRemove = 9,
    LinuxDontFork = 10,
    LinuxDoFork = 11,
    LinuxHwPoison = 100,
    LinuxSoftOffline = 101,
    LinuxMergeable = 12,
    LinuxUnmergeable = 13,
    LinuxHugepage = 14,
    LinuxNoHugepage = 15,
    LinuxDontDump = 16,
    LinuxDoDump = 17,
    LinuxWipeOnFork = 18,
    LinuxKeepOnFork = 19,
    LinuxCold = 20,
    LinuxPageOut = 21,
    LinuxPopulateRead = 22,
    LinuxPopulateWrite = 23,
    LinuxDontneedLocked = 24,
}

POSIX_MADV_* constants for use with madvise.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Normal = 0

POSIX_MADV_NORMAL

Sequential = 2

POSIX_MADV_SEQUENTIAL

Random = 1

POSIX_MADV_RANDOM

WillNeed = 3

POSIX_MADV_WILLNEED

LinuxDontNeed = 4

MADV_DONTNEED

LinuxFree = 8

MADV_FREE (since Linux 4.5)

LinuxRemove = 9

MADV_REMOVE

LinuxDontFork = 10

MADV_DONTFORK

LinuxDoFork = 11

MADV_DOFORK

LinuxHwPoison = 100

MADV_HWPOISON

LinuxSoftOffline = 101

MADV_SOFT_OFFLINE

LinuxMergeable = 12

MADV_MERGEABLE

LinuxUnmergeable = 13

MADV_UNMERGEABLE

LinuxHugepage = 14

MADV_HUGEPAGE

LinuxNoHugepage = 15

MADV_NOHUGEPAGE

LinuxDontDump = 16

MADV_DONTDUMP (since Linux 3.4)

LinuxDoDump = 17

MADV_DODUMP (since Linux 3.4)

LinuxWipeOnFork = 18

MADV_WIPEONFORK (since Linux 4.14)

LinuxKeepOnFork = 19

MADV_KEEPONFORK (since Linux 4.14)

LinuxCold = 20

MADV_COLD (since Linux 5.4)

LinuxPageOut = 21

MADV_PAGEOUT (since Linux 5.4)

LinuxPopulateRead = 22

MADV_POPULATE_READ (since Linux 5.14)

LinuxPopulateWrite = 23

MADV_POPULATE_WRITE (since Linux 5.14)

LinuxDontneedLocked = 24

MADV_DONTNEED_LOCKED (since Linux 5.18)

Implementations

impl Advice

pub const DontNeed: Self = Self::Normal

POSIX_MADV_DONTNEED

On Linux, this is mapped to POSIX_MADV_NORMAL because Linux’s MADV_DONTNEED differs from POSIX_MADV_DONTNEED. See LinuxDontNeed for the Linux behavior.

Trait Implementations

impl Clone for Advice

fn clone(&self) -> Advice

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Advice

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Advice

fn eq(&self, other: &Advice) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Advice

impl Eq for Advice

impl StructuralPartialEq for Advice