Enum CoreKind 

pub enum CoreKind {
    Performance,
    Efficiency,
    LpEfficiency,
    Unknown,
}

Classifies a CPU core by its performance/efficiency role.

Modern CPUs are heterogeneous in more than one way: Intel ships Performance, Efficiency and Low-Power-Efficiency cores on one die (Meteor Lake onward), AMD mixes full-fat and dense (“c”) cores that differ by frequency and cache rather than ISA, and ARM big.LITTLE/DynamIQ has always been multi-kind. A boolean P/E split cannot represent shipping silicon - this enum is N-ary.

Variants

Performance

A Performance core (Intel P-core, ARM “big”, AMD full-fat, Apple P).

Efficiency

An Efficiency core (Intel E-core, ARM “LITTLE”, AMD dense/“c”, Apple E).

LpEfficiency

A Low-Power Efficiency core (Intel LP-E cores on the SoC tile, or the lowest capacity tier on a 3-tier ARM design).

Unknown

The core kind could not be determined.

NOTE: detection never returns this on a homogeneous machine - the classification invariant is “homogeneous means all Performance”.

Implementations

impl CoreKind

pub const COUNT: usize = 4

Number of variants - sizes the per-kind tables in crate::CpuInfo.

pub fn index(self) -> usize

Stable index for per-kind tables (l1d[kind.index()]).

Trait Implementations

impl Clone for CoreKind

fn clone(&self) -> CoreKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CoreKind

impl Debug for CoreKind

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

Formats the value using the given formatter.

impl Display for CoreKind

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

Formats the value using the given formatter.

impl Eq for CoreKind

impl Hash for CoreKind

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 PartialEq for CoreKind

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for CoreKind