Enum DelayacctState 

#[non_exhaustive]
pub enum DelayacctState {
    ConfigOff,
    RuntimeOff,
    On,
}

Build + runtime state of kernel delay accounting, probed from /proc/sys/kernel/task_delayacct. Determines which taskstats delay-family fields are actually being populated:

• cpu_delay_* come from tsk->sched_info and are filled UNCONDITIONALLY by delayacct_add_tsk (kernel/delayacct.c) whenever CONFIG_TASK_DELAY_ACCT is built in — they survive the runtime toggle, so they read real values in both Self::On and Self::RuntimeOff.
• the per-resource lock categories (blkio, swapin, freepages, thrashing, compact, wpcopy, irq) are gated by tsk->delays, allocated at fork only when delayacct_on, so they read genuine values only in Self::On.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ConfigOff

/proc/sys/kernel/task_delayacct absent. The sysctl is registered only under CONFIG_TASK_DELAY_ACCT (kernel/delayacct.c), so an absent file means the option is not built in and NO delay-family field is populated. (Under ktstr’s root execution a present file is always readable, so absent is the only not-On/not-RuntimeOff outcome.)

RuntimeOff

File present, reads 0 — built in but the runtime toggle is off. cpu_delay_* still populate; the lock categories read zero for tasks forked while off.

On

File present, reads 1 — delay accounting fully active.

Trait Implementations

impl Clone for DelayacctState

fn clone(&self) -> DelayacctState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DelayacctState

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DelayacctState

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for DelayacctState

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

Formats the value using the given formatter.

impl PartialEq for DelayacctState

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

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for DelayacctState

impl Eq for DelayacctState

impl StructuralPartialEq for DelayacctState