Enum IoCacheStateV2 

#[repr(u8)]
pub enum IoCacheStateV2 {
    Cold = 1,
    Warm = 2,
    Direct = 3,
}

Explicitly observed page-cache state for one source of IO work.

Callers record what they know from how the IO was performed (for example O_DIRECT, an fadvise cold read, or a re-read of warm data). The profiler never infers a state from latency; unknown stays unrecorded.

Variants

Cold = 1

Warm = 2

Direct = 3

Implementations

impl IoCacheStateV2

pub const fn as_value(self) -> u64

Numeric value stored in the cache-state annotation.

pub fn from_value(value: u64) -> Option<Self>

Decode one annotation value; unknown values are rejected, never coerced.

Trait Implementations

impl Clone for IoCacheStateV2

fn clone(&self) -> IoCacheStateV2

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for IoCacheStateV2

impl Debug for IoCacheStateV2

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for IoCacheStateV2

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for IoCacheStateV2

impl PartialEq for IoCacheStateV2

fn eq(&self, other: &IoCacheStateV2) -> bool

Equality operator ==.

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

Inequality operator !=.

impl Serialize for IoCacheStateV2

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for IoCacheStateV2