Struct StatsSnapshot 

pub struct StatsSnapshot {
    pub submitted: u64,
    pub delivered: u64,
    pub orphan_reclaimed: u64,
    pub in_flight: u64,
    pub cancel_succeeded: u64,
    pub cancel_not_found: u64,
    pub cancel_already: u64,
    pub cq_overflow: u64,
    pub submit_errors: u64,
}

Point-in-time copy of the driver counters.

Fields

submitted: u64

Read ops handed to the kernel.

delivered: u64

CQEs whose result was received by a live caller.

orphan_reclaimed: u64

CQEs whose caller had dropped the future: the buffer stayed in the pending table the whole time and was reclaimed here, at the CQE.

in_flight: u64

Ops submitted but not yet completed. The kernel may still write into their buffers.

cancel_succeeded: u64

ASYNC_CANCEL CQEs that reported the target op was canceled (res == 0).

cancel_not_found: u64

ASYNC_CANCEL CQEs that reported the target was not found (-ENOENT): the op had already completed.

cancel_already: u64

ASYNC_CANCEL CQEs that reported the target was already executing and could not be interrupted (-EALREADY). A rising count is the hung-disk signal that makes drain-to-zero non-terminating (C4, rustfs/backlog#1055).

cq_overflow: u64

Kernel CQ-ring overflow counter. With NODROP (asserted at probe) overflow CQEs are buffered in the kernel overflow list and flushed on the next enter, NOT lost — so a non-zero value is a backpressure warning, not fatal loss (C5, rustfs/backlog#1056, #1167). In-flight is capped at entries and cancels are deduped, keeping completions <= 2*entries, so it should stay 0 in practice.

submit_errors: u64

ring.submit() calls that returned a non-transient error. A rising count means io_uring_enter is persistently failing (e.g. a seccomp/LSM policy applied after startup); the driver shuts the shard down after a bounded run of consecutive failures so callers fall back instead of stalling (rustfs/backlog#1162).

Trait Implementations

impl Clone for StatsSnapshot

fn clone(&self) -> StatsSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for StatsSnapshot

impl Debug for StatsSnapshot

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

Formats the value using the given formatter.

impl Default for StatsSnapshot

fn default() -> StatsSnapshot

Returns the “default value” for a type.

impl Eq for StatsSnapshot

impl PartialEq for StatsSnapshot

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for StatsSnapshot