Struct SlabState 

struct SlabState {
    partial_pages: [*mut SlabPageHeader; 26],
}

Per-size-class partial-page lists.

partial_pages[ci] is the head of a singly-linked list of SlabPageHeader nodes for class ci. A page enters the list on refill and on the first dealloc after going full. It leaves the list when all its blocks are allocated (it silently becomes “full”) or when it becomes completely empty (it is then returned to the buddy allocator).

Fields

partial_pages: [*mut SlabPageHeader; 26]

Implementations

impl SlabState

const fn new() -> Self

fn class_index_for_layout(layout: Layout) -> usize

Return the slab class index for layout.

The chosen class must be large enough for the payload and guarantee the requested alignment for every block carved from that class.

unsafe fn refill(&mut self, ci: usize, token: &IrqDisabledToken)

Allocate one buddy page, write a SlabPageHeader at its base, carve the remaining space into blocks, and prepend the page to partial_pages[ci].

unsafe fn alloc_block(&mut self, ci: usize, token: &IrqDisabledToken) -> *mut u8

Pop one block from the first partial page for class ci. Calls refill when the partial list is empty. Returns null on OOM.

unsafe fn dealloc_block( &mut self, ptr: *mut u8, ci: usize, token: &IrqDisabledToken, )

Return ptr to its slab page and reclaim the page to the buddy allocator if it becomes fully empty.

unsafe fn remove_from_partial(&mut self, page: *mut SlabPageHeader, ci: usize)

Unlink page from partial_pages[ci]. O(n) in partial-list length.

Trait Implementations

impl Send for SlabState

impl Sync for SlabState