Enum CacheType

pub enum CacheType {
    Unsafe,
    WriteBack,
}

Block device caching strategies, default to “Unsafe”. Firecracker offers the possiblity of choosing the block device caching strategy. Caching strategy affects the path data written from inside the microVM takes to the host persistent storage.

The caching strategy should be used in order to make a trade-off:

• Unsafe
• • enhances performance as fewer syscalls and IO operations are performed when running workloads
• • sacrifices data integrity in situations where the host simply loses the contents of the page cache without committing them to the backing storage (such as a power outage)
• • recommended for use cases with ephemeral storage, such as serverless environments
• Writeback
• • ensures that once a flush request was acknowledged by the host, the data is committed to the backing storage
• • sacrifices performance, from boot time increases to greater emulation-related latencies when running workloads
• • recommended for use cases with low power environments, such as embedded environments

Variants

Unsafe

WriteBack

Trait Implementations

impl Clone for CacheType

fn clone(&self) -> CacheType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CacheType

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

Formats the value using the given formatter.

impl Default for CacheType

fn default() -> CacheType

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CacheType

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for CacheType

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for CacheType

fn cmp(&self, other: &CacheType) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for CacheType

fn eq(&self, other: &CacheType) -> 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 PartialOrd for CacheType

fn partial_cmp(&self, other: &CacheType) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for CacheType

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 CacheType

impl Eq for CacheType

impl StructuralPartialEq for CacheType