Enum IOPriorityClass

pub enum IOPriorityClass {
    IoprioClassRt,
    IoprioClassBe,
    IoprioClassIdle,
}

IOPriorityClass represents an I/O scheduling class.

Variants

IoprioClassRt

This is the realtime io class. This scheduling class is given higher priority than any other in the system, processes from this class are given first access to the disk every time. Thus it needs to be used with some care, one io RT process can starve the entire system. Within the RT class, there are 8 levels of class data that determine exactly how much time this process needs the disk for on each service. In the future this might change to be more directly mappable to performance, by passing in a wanted data rate instead

IoprioClassBe

This is the best-effort scheduling class, which is the default for any process that hasn’t set a specific io priority. The class data determines how much io bandwidth the process will get, it’s directly mappable to the cpu nice levels just more coarsely implemented. 0 is the highest BE prio level, 7 is the lowest. The mapping between cpu nice level and io nice level is determined as: io_nice = (cpu_nice + 20) / 5.

IoprioClassIdle

This is the idle scheduling class, processes running at this level only get io time when no one else needs the disk. The idle class has no class data, since it doesn’t really apply here.

Trait Implementations

impl Clone for IOPriorityClass

fn clone(&self) -> IOPriorityClass

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for IOPriorityClass

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

Formats the value using the given formatter.

impl Default for IOPriorityClass

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for IOPriorityClass

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for IOPriorityClass

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

Formats the value using the given formatter.

impl FromStr for IOPriorityClass

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<IOPriorityClass, <Self as FromStr>::Err>

Parses a string s to return a value of this type.

impl PartialEq for IOPriorityClass

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

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<&str> for IOPriorityClass

type Error = ParseError

The type returned in the event of a conversion error.

fn try_from(s: &str) -> Result<IOPriorityClass, <Self as TryFrom<&str>>::Error>

Performs the conversion.

impl Copy for IOPriorityClass

impl Eq for IOPriorityClass

impl StructuralPartialEq for IOPriorityClass