Enum ResolvedAffinity 

pub enum ResolvedAffinity {
    None,
    Fixed(BTreeSet<usize>),
    Random {
        from: BTreeSet<usize>,
        count: usize,
    },
    SingleCpu(usize),
}

Resolved CPU affinity for a worker process.

Created from AffinityIntent at runtime based on topology and cpuset assignments. Variant names track AffinityIntent where the same shape exists pre/post-resolution; payload presence distinguishes intent from concrete CPU id(s). See the AffinityIntent type doc for the full pre/post mapping table.

Variants

None

No affinity constraint.

Fixed(BTreeSet<usize>)

Pin to a specific set of CPUs.

Random

Pin to count randomly-chosen CPUs from from.

• count must be > 0; zero is rejected at resolve time (previously it coerced silently to 1 and masked caller bugs).
• count > from.len() is clamped to from.len() — asking for more CPUs than the pool contains is a topology fact, not a caller error.
• from empty with count > 0 is a caller bug: resolve_affinity bails (an unsatisfiable sample request would otherwise produce an empty sched_setaffinity mask that the kernel rejects with EINVAL). The resolution step that produces this variant — see crate::scenario::resolve_affinity_for_cgroup — bails on empty pools before construction; no silent fallback. Direct constructor callers (e.g. test fixtures) must do the same: use ResolvedAffinity::None for “no affinity constraint”, never Random { from: empty, count: > 0 }.

Fields

from: BTreeSet<usize>

count: usize

SingleCpu(usize)

Pin to a single CPU.

Implementations

impl ResolvedAffinity

pub fn fixed(cpus: impl IntoIterator<Item = usize>) -> Self

Construct a ResolvedAffinity::Fixed from any iterator over CPU ids. Mirrors AffinityIntent::exact.

pub fn random(from: impl IntoIterator<Item = usize>, count: usize) -> Self

Construct a ResolvedAffinity::Random from a pool iterator and a sample count. Mirrors AffinityIntent::random_subset.

pub const fn single_cpu(cpu: usize) -> Self

Construct a ResolvedAffinity::SingleCpu.

Trait Implementations

impl Clone for ResolvedAffinity

fn clone(&self) -> ResolvedAffinity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ResolvedAffinity

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

Formats the value using the given formatter.

impl Default for ResolvedAffinity

fn default() -> ResolvedAffinity

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ResolvedAffinity

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for ResolvedAffinity

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 ResolvedAffinity

fn eq(&self, other: &ResolvedAffinity) -> 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 Serialize for ResolvedAffinity

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for ResolvedAffinity

impl StructuralPartialEq for ResolvedAffinity