Enum Tier 

#[repr(u8)]
pub enum Tier {
    Hot = 0,
    Warm = 1,
    Dormant = 2,
    Cold = 3,
}

The four memory tiers defined in ADR-136.

This extends the 3-tier MemoryTier from rvm-types by adding the Dormant tier that stores compressed reconstructable state.

Variants

Hot = 0

Tier 0 – Hot: per-core SRAM or L1/L2 cache-resident. Always resident during partition execution.

Warm = 1

Tier 1 – Warm: cluster-shared DRAM. Resident if cut_value + recency_score > eviction_threshold.

Dormant = 2

Tier 2 – Dormant: compressed storage in main memory. Stored as witness checkpoint + delta compression; reconstructed on demand.

Cold = 3

Tier 3 – Cold: RVF-backed archival on persistent storage. Accessed only during recovery or explicit restore. Never auto-promoted.

Implementations

impl Tier

pub const fn index(self) -> u8

Return the numeric tier index.

pub const fn from_u8(val: u8) -> Option<Self>

Try to create a Tier from a raw u8 value.

Trait Implementations

impl Clone for Tier

fn clone(&self) -> Tier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Tier

impl Debug for Tier

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

Formats the value using the given formatter.

impl Eq for Tier

impl Hash for Tier

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Tier

fn cmp(&self, other: &Tier) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Tier

fn eq(&self, other: &Tier) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for Tier

fn partial_cmp(&self, other: &Tier) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Tier