Struct Relief 

pub struct Relief {
    pub moved: usize,
    pub freed: usize,
}

What a sweep did, which is two numbers because it does two things.

Kept apart rather than added up because they answer different questions. moved is how much colder the keyspace got and it is what a test about demotion is written against. freed is how much memory came back, and that is what a server holding itself to a limit has to read.

Fields

moved: usize

Values that went out to the file.

freed: usize

Bytes of memory the map gave back while that was happening, which is segments the arena handed over and not records that got shorter.

Implementations

impl Relief

pub const fn made_room(self) -> bool

Whether the sweep is worth calling again, which is the question the caller with the limit is really asking.

Either number being non zero is progress. Both being zero is a keyspace with nothing left to move and no dead space to reclaim, and a write that cannot be fitted in that is a write that has to be refused.

Trait Implementations

impl Clone for Relief

fn clone(&self) -> Relief

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Relief

impl Debug for Relief

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

Formats the value using the given formatter.

impl Default for Relief

fn default() -> Relief

Returns the “default value” for a type.

impl Eq for Relief

impl PartialEq for Relief

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Relief