Struct MemoryBudget 

pub struct MemoryBudget {
    pub max_pages: usize,
    pub high_watermark: usize,
    pub low_watermark: usize,
    pub reserved_pages: HashSet<u64>,
}

Memory budget enforcement (Heijunka principle)

Fields

max_pages: usize

Maximum pages in memory

high_watermark: usize

High watermark (start eviction)

low_watermark: usize

Low watermark (stop eviction)

reserved_pages: HashSet<u64>

Reserved pages (never evict)

Implementations

impl MemoryBudget

pub fn new(max_pages: usize) -> Self

Create a new memory budget

pub fn with_watermarks(max_pages: usize, high_pct: f64, low_pct: f64) -> Self

Create with custom watermarks

pub fn reserve_page(&mut self, page_id: u64)

Reserve a page (won’t be evicted)

pub fn release_page(&mut self, page_id: u64)

Release a reserved page

pub fn needs_eviction(&self, current_pages: usize) -> bool

Check if eviction is needed

pub fn can_stop_eviction(&self, current_pages: usize) -> bool

Check if eviction can stop

pub fn can_evict(&self, page_id: u64) -> bool

Check if a page can be evicted

Trait Implementations

impl Clone for MemoryBudget

fn clone(&self) -> MemoryBudget

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MemoryBudget

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

Formats the value using the given formatter.