Struct CpuTracker 

pub struct CpuTracker { /* private fields */ }

Tracks per-PID CPU time across ticks to turn the kernel’s cumulative counter into an instantaneous rate. A single /proc/<pid>/stat read only gives total ticks consumed since the process started; the rate is the delta between two reads over the wall time between them.

Implementations

impl CpuTracker

pub fn new() -> Self

pub fn sample(&mut self, pid: u32) -> Option<f32>

CPU % (relative to one core) for pid, or None. The first sighting only establishes a baseline — there is no prior point to difference against — so it returns None by design rather than fabricating a since-boot average. Later sightings return the rate. A missing/unreadable stat (PID exited, foreign user) is a normal None.

pub fn prune(&mut self, live_pids: &[u32])

Drop bookkeeping for PIDs no longer present so the map does not grow without bound over a long-running session (a busy host churns through thousands of short-lived PIDs).

Trait Implementations

impl Default for CpuTracker

fn default() -> CpuTracker

Returns the “default value” for a type.