Struct PoolStats 

pub struct PoolStats {
    pub hits: u64,
    pub misses: u64,
    pub evictions: u64,
    pub frames_total: usize,
    pub peak_pins: u32,
    pub sync_data_calls: u64,
    pub sync_full_calls: u64,
    pub dirty_pages_flushed: u64,
}

Fields

hits: u64

misses: u64

evictions: u64

frames_total: usize

Total frames the pool reserved at open – its CAPACITY, not its residency. The region is allocated once and never grown, so this is the anonymous memory the pool holds from open onward whether or not the frames are populated.

It was called frames_used, and that name cost a reviewer a false finding: 170 MB “used” against a 5 MB database reads as an accounting bug rather than as a preallocated arena working exactly as designed. A number that invites a wrong inference is a reporting defect even when the arithmetic is right. See also a_full_scan_pins_one_leaf_at_a_time in btree.rs, which independently found this field cannot move and so cannot be asserted on for any specific operation – peak_pins is the field for that.

peak_pins: u32

sync_data_calls: u64

Barriers actually placed by flush_all, counted at the point they are issued rather than where they are chosen. Asserting on what a caller like Store::checkpoint passed would only prove it passed something – these live here because this is where the syscall actually happens, so a caller that silently ignored its own argument could not still make the test pass.

sync_full_calls: u64

dirty_pages_flushed: u64

Dirty frames written by flush_all (monotonic since pool construction).

Trait Implementations

impl Clone for PoolStats

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PoolStats

impl Debug for PoolStats

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

Formats the value using the given formatter.

impl Default for PoolStats

fn default() -> Self

Returns the “default value” for a type.