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CompactionStats

strat9_kernel::memory::buddy

Struct CompactionStats 

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pub struct CompactionStats {
Show 14 fields
    pub attempts: usize,
    pub successes: usize,
    pub last_order: Option<u8>,
    pub last_migratetype: Option<Migratetype>,
    pub last_zone: Option<ZoneType>,
    pub last_pressure: Option<ZonePressure>,
    pub last_fragmentation_score: usize,
    pub last_requested_pages: usize,
    pub last_available_pages: usize,
    pub last_usable_pages: usize,
    pub last_cached_pages: usize,
    pub last_drained_pages: usize,
    pub last_pageblock_count: usize,
    pub last_matching_pageblocks: usize,

}
Expand description

Snapshot of the last fragmentation-driven compaction assist attempt.

The fields are intentionally plain data so crash dumps and shell commands can read them without locking or heap allocation.

Fields§

§attempts: usize

Number of targeted compaction assists attempted after an allocation miss.

§successes: usize

Number of attempts that yielded a successful retry.

§last_order: Option<u8>

Last requested buddy order that triggered a targeted drain.

§last_migratetype: Option<Migratetype>

Mobility class of the last assisted allocation.

§last_zone: Option<ZoneType>

Zone selected as the preferred compaction target.

§last_pressure: Option<ZonePressure>

Pressure state observed on that zone before draining caches.

§last_fragmentation_score: usize

Fragmentation score that justified the assist path.

§last_requested_pages: usize

Pages requested by the original allocation.

§last_available_pages: usize

Effective free pages left above reserves in the chosen zone.

§last_usable_pages: usize

Free pages already available at or above the requested order.

§last_cached_pages: usize

Order-0 pages parked in local caches for the chosen zone.

§last_drained_pages: usize

Pages actually drained from local caches during the last attempt.

§last_pageblock_count: usize

Total pageblocks tracked in the selected zone.

§last_matching_pageblocks: usize

Pageblocks already tagged with the requested migratetype.

Implementations§

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impl CompactionStats

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pub const fn empty() -> Self

Empty snapshot used before any assisted drain happened.

Trait Implementations§

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impl Clone for CompactionStats

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fn clone(&self) -> CompactionStats

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 CompactionStats

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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 CompactionStats

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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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