Struct CgroupStats 

pub struct CgroupStats {
    pub cpu_usage_nsec: Option<u64>,
    pub memory_current: Option<u64>,
    pub memory_available: Option<u64>,
    pub tasks_current: Option<u64>,
    pub processes: u32,
    pub io_read_bytes: Option<u64>,
    pub io_read_operations: Option<u64>,
}

Accounting values for one service’s cgroup, read from cgroupfs.

None per field means “no data” (file absent or unparsable); callers map that to u64::MAX, the [not set] sentinel D-Bus reports for the same situation. processes counts instead of measuring, so it is 0 — not None — when the cgroup is gone, matching GetProcesses on a dead unit.

Fields

cpu_usage_nsec: Option<u64>

cpu.stat → usage_usec × 1000. No per-start baseline is subtracted: D-Bus subtracts the counter value captured at unit start, which is unknowable from the filesystem, so a reused cgroup reads marginally higher. Fresh cgroups (the common case) match exactly.

memory_current: Option<u64>

memory.current verbatim.

memory_available: Option<u64>

min(memory.max, memory.high) − memory.current, minimized over the unit’s ancestor slices; the root level always binds at host MemAvailable. See the module docs for the full algorithm.

tasks_current: Option<u64>

pids.current verbatim.

processes: u32

Recursive cgroup.procs walk with the main and control PIDs folded in the way systemd’s GetProcesses does (both can sit outside the cgroup).

io_read_bytes: Option<u64>

io.stat → rbytes summed over all devices. Some(0) when the file exists but is empty (controller enabled, no IO yet — D-Bus reports 0 there too); None when the file is absent.

io_read_operations: Option<u64>

io.stat → rios summed over all devices, same presence semantics.

Trait Implementations

impl Clone for CgroupStats

fn clone(&self) -> CgroupStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CgroupStats

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

Formats the value using the given formatter.

impl Default for CgroupStats

fn default() -> CgroupStats

Returns the “default value” for a type.

impl Eq for CgroupStats

impl PartialEq for CgroupStats

fn eq(&self, other: &CgroupStats) -> 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 CgroupStats