enum Residency {
UnbackedResident,
BackedResident,
WriteInFlight,
Evicted,
Oversize,
}pool only.Expand description
Residency state of a chunk.
Variants§
UnbackedResident
Lives only in the pool; no extent copy exists. Freeing it never touches the backing store.
BackedResident
Resident, and an identical extent copy exists; eviction releases physical pages without I/O.
WriteInFlight
Resident and readable, with compression into an extent scheduled on a
spill thread. Completion moves an evicting chunk to
Residency::Evicted and an eagerly backed one to
Residency::BackedResident; a free observed at dequeue cancels the
write instead.
Evicted
Extent copy only; the chunk holds no slot. The extent itself may
still be RAM-resident (the compressed tier) or paged out to the swap
device. Reads decompress the extent straight into the caller’s
buffer and leave the chunk evicted, except that an admitting read
may lift it back to Residency::BackedResident.
Oversize
Larger than the largest size class; held as a plain heap allocation, always resident. A prototype limitation, not a design state.
Trait Implementations§
impl Copy for Residency
impl Eq for Residency
impl StructuralPartialEq for Residency
Auto Trait Implementations§
impl Freeze for Residency
impl RefUnwindSafe for Residency
impl Send for Residency
impl Sync for Residency
impl Unpin for Residency
impl UnsafeUnpin for Residency
impl UnwindSafe for Residency
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