Enum MmapAdvise 

#[non_exhaustive]
#[repr(i32)]
pub enum MmapAdvise {
    MADV_NORMAL = 0,
    MADV_RANDOM = 1,
    MADV_SEQUENTIAL = 2,
    MADV_WILLNEED = 3,
    MADV_DONTNEED = 4,
    MADV_REMOVE = 9,
    MADV_DONTFORK = 10,
    MADV_DOFORK = 11,
    MADV_HWPOISON = 100,
    MADV_MERGEABLE = 12,
    MADV_UNMERGEABLE = 13,
    MADV_SOFT_OFFLINE = 101,
    MADV_HUGEPAGE = 14,
    MADV_NOHUGEPAGE = 15,
    MADV_DONTDUMP = 16,
    MADV_DODUMP = 17,
    MADV_FREE = 8,
    MADV_PAGEOUT = 21,
    MADV_COLD = 20,
    MADV_WIPEONFORK = 18,
    MADV_KEEPONFORK = 19,
    MADV_POPULATE_READ = 22,
    MADV_POPULATE_WRITE = 23,
}

Available on crate feature mman only.

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 = 0

No further special treatment. This is the default.

MADV_RANDOM = 1

Expect random page references.

MADV_SEQUENTIAL = 2

Expect sequential page references.

MADV_WILLNEED = 3

Expect access in the near future.

MADV_DONTNEED = 4

Do not expect access in the near future.

MADV_REMOVE = 9

Available on linux_android only.

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

MADV_DONTFORK = 10

Available on linux_android only.

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

MADV_DOFORK = 11

Available on linux_android only.

Undo the effect of MADV_DONTFORK.

MADV_HWPOISON = 100

Available on linux_android only.

Poison the given pages.

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

MADV_MERGEABLE = 12

Available on linux_android only.

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

MADV_UNMERGEABLE = 13

Available on linux_android only.

Undo the effect of MADV_MERGEABLE

MADV_SOFT_OFFLINE = 101

Available on Android, or Linux and (AArch64 or ARM or PowerPC or PowerPC-64 or s390x or x86 or x86-64 or SPARC64) only.

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

MADV_HUGEPAGE = 14

Available on linux_android only.

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

MADV_NOHUGEPAGE = 15

Available on linux_android only.

Undo the effect of MADV_HUGEPAGE.

MADV_DONTDUMP = 16

Available on linux_android only.

Exclude the given range from a core dump.

MADV_DODUMP = 17

Available on linux_android only.

Undo the effect of an earlier MADV_DONTDUMP.

MADV_FREE = 8

Available on neither target_os=aix nor target_os=hurd nor Cygwin nor Redox.

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

MADV_PAGEOUT = 21

Available on linux_android only.

Reclaim the address range when applicable.

MADV_COLD = 20

Available on linux_android only.

Deactivate the address range when applicable.

MADV_WIPEONFORK = 18

Available on linux_android only.

After fork, the adress range is zero filled.

MADV_KEEPONFORK = 19

Available on linux_android only.

Undo MADV_WIPEONFORK when it applied.

MADV_POPULATE_READ = 22

Available on linux_android only.

Pre-load the address range for reading to reduce page-fault latency.

MADV_POPULATE_WRITE = 23

Available on linux_android only.

Pre-fault the address range for writing to reduce page-fault latency on subsequent writes.

Trait Implementations

impl Clone for MmapAdvise

fn clone(&self) -> MmapAdvise

Returns a duplicate 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, Self: Sized,

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for MmapAdvise

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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 StructuralPartialEq for MmapAdvise