Struct PhysicalPageFlags

pub struct PhysicalPageFlags(/* private fields */);

Represents the fields and flags in a page table entry for a memory page.

Implementations

impl PhysicalPageFlags

pub const LOCKED: PhysicalPageFlags

The page is being locked for exclusive access, e.g. by undergoing read/write IO

pub const ERROR: PhysicalPageFlags

IO error occurred

pub const REFERENCED: PhysicalPageFlags

The page has been referenced since last LRU list enqueue/requeue

pub const UPTODATE: PhysicalPageFlags

The page has up-to-date data. ie. for file backed page: (in-memory data revision >= on-disk one)

pub const DIRTY: PhysicalPageFlags

The page has been written to, hence contains new data. i.e. for file backed page: (in-memory data revision > on-disk one)

pub const LRU: PhysicalPageFlags

The page is in one of the LRU lists

pub const ACTIVE: PhysicalPageFlags

The page is in the active LRU list

pub const SLAB: PhysicalPageFlags

The page is managed by the SLAB/SLOB/SLUB/SLQB kernel memory allocator. When compound page is used, SLUB/SLQB will only set this flag on the head page; SLOB will not flag it at all

pub const WRITEBACK: PhysicalPageFlags

The page is being synced to disk

pub const RECLAIM: PhysicalPageFlags

The page will be reclaimed soon after its pageout IO completed

pub const BUDDY: PhysicalPageFlags

A free memory block managed by the buddy system allocator. The buddy system organizes free memory in blocks of various orders. An order N block has 2^N physically contiguous pages, with the BUDDY flag set for and only for the first page

pub const MMAP: PhysicalPageFlags

A memory mapped page

pub const ANON: PhysicalPageFlags

A memory mapped page that is not part of a file

pub const SWAPCACHE: PhysicalPageFlags

The page is mapped to swap space, i.e. has an associated swap entry

pub const SWAPBACKED: PhysicalPageFlags

The page is backed by swap/RAM

pub const COMPOUND_HEAD: PhysicalPageFlags

A compound page with order N consists of 2^N physically contiguous pages. A compound page with order 2 takes the form of “HTTT”, where H donates its head page and T donates its tail page(s). The major consumers of compound pages are hugeTLB pages (https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html#hugetlbpage), the SLUB etc. memory allocators and various device drivers. However in this interface, only huge/giga pages are made visible to end users

pub const COMPOUND_TAIL: PhysicalPageFlags

A compound page tail (see description above)

pub const HUGE: PhysicalPageFlags

This is an integral part of a HugeTLB page

pub const UNEVICTABLE: PhysicalPageFlags

The page is in the unevictable (non-)LRU list It is somehow pinned and not a candidate for LRU page reclaims, e.g. ramfs pages, shmctl(SHM_LOCK) and mlock() memory segments

pub const HWPOISON: PhysicalPageFlags

Hardware detected memory corruption on this page: don’t touch the data!

pub const NOPAGE: PhysicalPageFlags

No page frame exists at the requested address

pub const KSM: PhysicalPageFlags

Identical memory pages dynamically shared between one or more processes

pub const THP: PhysicalPageFlags

Contiguous pages which construct transparent hugepages

pub const OFFLINE: PhysicalPageFlags

The page is logically offline

pub const ZERO_PAGE: PhysicalPageFlags

Zero page for pfn_zero or huge_zero page

pub const IDLE: PhysicalPageFlags

The page has not been accessed since it was marked idle (see https://www.kernel.org/doc/html/latest/admin-guide/mm/idle_page_tracking.html#idle-page-tracking). Note that this flag may be stale in case the page was accessed via a PTE. To make sure the flag is up-to-date one has to read /sys/kernel/mm/page_idle/bitmap first

pub const PGTABLE: PhysicalPageFlags

The page is in use as a page table

impl PhysicalPageFlags

pub const fn empty() -> PhysicalPageFlags

Get a flags value with all bits unset.

pub const fn all() -> PhysicalPageFlags

Get a flags value with all known bits set.

pub const fn bits(&self) -> u64

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: u64) -> Option<PhysicalPageFlags>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: u64) -> PhysicalPageFlags

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: u64) -> PhysicalPageFlags

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<PhysicalPageFlags>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: PhysicalPageFlags) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

pub const fn contains(&self, other: PhysicalPageFlags) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

pub fn insert(&mut self, other: PhysicalPageFlags)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: PhysicalPageFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: PhysicalPageFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: PhysicalPageFlags, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection(self, other: PhysicalPageFlags) -> PhysicalPageFlags

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: PhysicalPageFlags) -> PhysicalPageFlags

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: PhysicalPageFlags) -> PhysicalPageFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference( self, other: PhysicalPageFlags, ) -> PhysicalPageFlags

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> PhysicalPageFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl PhysicalPageFlags

pub const fn iter(&self) -> Iter<PhysicalPageFlags>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<PhysicalPageFlags>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

impl PhysicalPageFlags

pub fn parse_info(info: u64) -> PhysicalPageFlags

Trait Implementations

impl Binary for PhysicalPageFlags

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

Formats the value using the given formatter.

impl BitAnd for PhysicalPageFlags

fn bitand(self, other: PhysicalPageFlags) -> PhysicalPageFlags

The bitwise and (&) of the bits in two flags values.

type Output = PhysicalPageFlags

The resulting type after applying the & operator.

impl BitAndAssign for PhysicalPageFlags

fn bitand_assign(&mut self, other: PhysicalPageFlags)

The bitwise and (&) of the bits in two flags values.

impl BitOr for PhysicalPageFlags

fn bitor(self, other: PhysicalPageFlags) -> PhysicalPageFlags

The bitwise or (|) of the bits in two flags values.

type Output = PhysicalPageFlags

The resulting type after applying the | operator.

impl BitOrAssign for PhysicalPageFlags

fn bitor_assign(&mut self, other: PhysicalPageFlags)

The bitwise or (|) of the bits in two flags values.

impl BitXor for PhysicalPageFlags

fn bitxor(self, other: PhysicalPageFlags) -> PhysicalPageFlags

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = PhysicalPageFlags

The resulting type after applying the ^ operator.

impl BitXorAssign for PhysicalPageFlags

fn bitxor_assign(&mut self, other: PhysicalPageFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Clone for PhysicalPageFlags

fn clone(&self) -> PhysicalPageFlags

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PhysicalPageFlags

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PhysicalPageFlags

fn deserialize<__D>( __deserializer: __D, ) -> Result<PhysicalPageFlags, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Extend<PhysicalPageFlags> for PhysicalPageFlags

fn extend<T>(&mut self, iterator: T)

where T: IntoIterator<Item = PhysicalPageFlags>,

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for PhysicalPageFlags

const FLAGS: &'static [Flag<PhysicalPageFlags>]

The set of defined flags.

type Bits = u64

The underlying bits type.

fn bits(&self) -> u64

Get the underlying bits value.

fn from_bits_retain(bits: u64) -> PhysicalPageFlags

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

fn intersects(&self, other: Self) -> bool

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

fn contains(&self, other: Self) -> bool

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call Flags::insert when value is true or Flags::remove when value is false.

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

The bitwise and (&) of the bits in two flags values.

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

The bitwise or (|) of the bits in two flags values.

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

The intersection of a source flags value with the complement of a target flags value (&!).

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

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl FromIterator<PhysicalPageFlags> for PhysicalPageFlags

fn from_iter<T>(iterator: T) -> PhysicalPageFlags

where T: IntoIterator<Item = PhysicalPageFlags>,

The bitwise or (|) of the bits in each flags value.

impl Hash for PhysicalPageFlags

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

where __H: Hasher,

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 IntoIterator for PhysicalPageFlags

type Item = PhysicalPageFlags

The type of the elements being iterated over.

type IntoIter = Iter<PhysicalPageFlags>

Which kind of iterator are we turning this into?

fn into_iter(self) -> <PhysicalPageFlags as IntoIterator>::IntoIter

Creates an iterator from a value.

impl LowerHex for PhysicalPageFlags

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

Formats the value using the given formatter.

impl Not for PhysicalPageFlags

fn not(self) -> PhysicalPageFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = PhysicalPageFlags

The resulting type after applying the ! operator.

impl Octal for PhysicalPageFlags

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

Formats the value using the given formatter.

impl Ord for PhysicalPageFlags

fn cmp(&self, other: &PhysicalPageFlags) -> 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 PhysicalPageFlags

fn eq(&self, other: &PhysicalPageFlags) -> 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 PhysicalPageFlags

fn partial_cmp(&self, other: &PhysicalPageFlags) -> 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 Serialize for PhysicalPageFlags

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Sub for PhysicalPageFlags

fn sub(self, other: PhysicalPageFlags) -> PhysicalPageFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = PhysicalPageFlags

The resulting type after applying the - operator.

impl SubAssign for PhysicalPageFlags

fn sub_assign(&mut self, other: PhysicalPageFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl UpperHex for PhysicalPageFlags

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

Formats the value using the given formatter.

impl Copy for PhysicalPageFlags

impl Eq for PhysicalPageFlags

impl StructuralPartialEq for PhysicalPageFlags