Struct ZoneSegment 

pub struct ZoneSegment {
    pub base: PhysAddr,
    pub page_count: usize,
    pub free_lists: [[u64; 12]; 2],
    pub buddy_bitmaps: [BuddyBitmap; 12],
    pub pageblock_tags: *mut u8,
    pub pageblock_count: usize,
    pub alloc_bitmap: BuddyBitmap,
}

One contiguous buddy-managed extent inside a zone.

Fields

base: PhysAddr

Base physical address of this contiguous segment.

page_count: usize

Number of pages managed by this segment.

free_lists: [[u64; 12]; 2]

Free lists for each order within this segment, split by migratetype.

buddy_bitmaps: [BuddyBitmap; 12]

Per-order parity bitmaps scoped to this segment only.

pageblock_tags: *mut u8

Per-pageblock migratetype tags used to keep movable and unmovable frees grouped.

pageblock_count: usize

Number of pageblocks described by pageblock_tags.

alloc_bitmap: BuddyBitmap

Optional debug bitmap: 1 bit per page = allocated.

Implementations

impl ZoneSegment

pub const fn empty() -> Self

Empty segment for const initialization.

pub fn is_populated(&self) -> bool

Returns whether this segment is populated.

pub fn contains_address(&self, addr: PhysAddr) -> bool

Returns whether an address falls within the segment.

pub fn end_address(&self) -> u64

Returns the exclusive end address of the segment.

pub fn free_list_count(&self, order: u8) -> usize

Count the number of free blocks at a given order.

pub fn free_list_count_for(&self, order: u8, migratetype: Migratetype) -> usize

Count the number of free blocks at a given order and migratetype.

Trait Implementations

impl Clone for ZoneSegment

fn clone(&self) -> ZoneSegment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ZoneSegment