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ZoneStats

strat9_kernel::memory::buddy

Struct ZoneStats 

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pub struct ZoneStats {
Show 23 fields
    pub zone_type: ZoneType,
    pub base: u64,
    pub managed_pages: usize,
    pub present_pages: usize,
    pub spanned_pages: usize,
    pub reserved_pages: usize,
    pub allocated_pages: usize,
    pub cached_pages: usize,
    pub cached_unmovable_pages: usize,
    pub cached_movable_pages: usize,
    pub free_pages: usize,
    pub movable_free_pages: usize,
    pub unmovable_free_pages: usize,
    pub segment_count: usize,
    pub segment_capacity: usize,
    pub pageblock_count: usize,
    pub unmovable_pageblocks: usize,
    pub movable_pageblocks: usize,
    pub watermark_min: usize,
    pub watermark_low: usize,
    pub watermark_high: usize,
    pub lowmem_reserve_pages: usize,
    pub largest_free_order: Option<u8>,

}
Expand description

Snapshot statistics for a single memory zone.

The struct is plain data on purpose so low-level diagnostics and crash paths can snapshot it onto the stack without heap allocation.

Fields§

§zone_type: ZoneType

Zone classification.

§base: u64

Lowest physical address covered by the zone span.

§managed_pages: usize

Pages currently managed by buddy in this zone.

§present_pages: usize

Pages reported as usable by the firmware map before reservations.

§spanned_pages: usize

Outer span in pages, including holes.

§reserved_pages: usize

Pages removed from management during bootstrap.

§allocated_pages: usize

Pages allocated to live callers.

§cached_pages: usize

Order-0 pages currently parked in per-CPU caches.

§cached_unmovable_pages: usize

Cached pages parked in unmovable per-CPU caches.

§cached_movable_pages: usize

Cached pages parked in movable per-CPU caches.

§free_pages: usize

Effective free pages, including cached pages.

§movable_free_pages: usize

Free pages tracked in movable free lists.

§unmovable_free_pages: usize

Free pages tracked in unmovable free lists.

§segment_count: usize

Number of populated contiguous segments.

§segment_capacity: usize

Reserved segment-table capacity.

§pageblock_count: usize

Total number of pageblocks tracked across all segments.

§unmovable_pageblocks: usize

Pageblocks currently tagged unmovable.

§movable_pageblocks: usize

Pageblocks currently tagged movable.

§watermark_min: usize

Minimum watermark.

§watermark_low: usize

Low watermark.

§watermark_high: usize

High watermark.

§lowmem_reserve_pages: usize

Low-memory reserve kept for lower-priority paths.

§largest_free_order: Option<u8>

Largest currently available free order.

Implementations§

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impl ZoneStats

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pub const fn empty() -> Self

Empty snapshot entry for stack-allocated arrays.

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pub fn hole_pages(&self) -> usize

Returns the number of hole pages inside the zone span.

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pub fn reserve_floor_pages(&self) -> usize

Returns the effective reserve floor enforced by policy.

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pub fn available_after_reserve_pages(&self) -> usize

Returns the free pages remaining after the reserve floor is discounted.

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pub fn pressure(&self) -> ZonePressure

Returns the derived pressure state from the current zone watermarks.

Trait Implementations§

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impl Clone for ZoneStats

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fn clone(&self) -> ZoneStats

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ZoneStats

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

Formats the value using the given formatter. Read more
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impl Copy for ZoneStats

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

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