Enum nix::sys::mman::MmapAdvise

#[repr(i32)]
#[non_exhaustive]
pub enum MmapAdvise {
    MADV_NORMAL,
    MADV_RANDOM,
    MADV_SEQUENTIAL,
    MADV_WILLNEED,
    MADV_DONTNEED,
    MADV_REMOVE,
    MADV_DONTFORK,
    MADV_DOFORK,
    MADV_HWPOISON,
    MADV_MERGEABLE,
    MADV_UNMERGEABLE,
    MADV_SOFT_OFFLINE,
    MADV_HUGEPAGE,
    MADV_NOHUGEPAGE,
    MADV_DONTDUMP,
    MADV_DODUMP,
    MADV_FREE,
}

Usage information for a range of memory to allow for performance optimizations by the kernel.

Used by 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.

MADV_NORMAL

No further special treatment. This is the default.

MADV_RANDOM

Expect random page references.

MADV_SEQUENTIAL

Expect sequential page references.

MADV_WILLNEED

Expect access in the near future.

MADV_DONTNEED

Do not expect access in the near future.

MADV_REMOVE

Free up a given range of pages and its associated backing store.

MADV_DONTFORK

Do not make pages in this range available to the child after a fork(2).

MADV_DOFORK

Undo the effect of MADV_DONTFORK.

MADV_HWPOISON

Poison the given pages.

Subsequent references to those pages are treated like hardware memory corruption.

MADV_MERGEABLE

Enable Kernel Samepage Merging (KSM) for the given pages.

MADV_UNMERGEABLE

Undo the effect of MADV_MERGEABLE

MADV_SOFT_OFFLINE

Preserve the memory of each page but offline the original page.

MADV_HUGEPAGE

Enable Transparent Huge Pages (THP) for pages in the given range.

MADV_NOHUGEPAGE

Undo the effect of MADV_HUGEPAGE.

MADV_DONTDUMP

Exclude the given range from a core dump.

MADV_DODUMP

Undo the effect of an earlier MADV_DONTDUMP.

MADV_FREE

Specify that the application no longer needs the pages in the given range.

Trait Implementations

impl Clone for MmapAdvise

fn clone(&self) -> MmapAdvise

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MmapAdvise

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

Formats the value using the given formatter.

impl Hash for MmapAdvise

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,

Feeds a slice of this type into the given Hasher.

impl Ord for MmapAdvise

fn cmp(&self, other: &MmapAdvise) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: PartialOrd<Self>,

Restrict a value to a certain interval.

impl PartialEq<MmapAdvise> for MmapAdvise

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd<MmapAdvise> for MmapAdvise

fn partial_cmp(&self, other: &MmapAdvise) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for MmapAdvise

impl Eq for MmapAdvise

impl StructuralEq for MmapAdvise

impl StructuralPartialEq for MmapAdvise