Struct HeapStats 

pub struct HeapStats {
    pub committed: usize,
    pub reserved: usize,
    pub malloc_requested: usize,
    pub pages: usize,
    pub pages_abandoned: usize,
    pub heaps: usize,
    pub theaps: usize,
    pub purged: usize,
    pub detailed: bool,
}

Exact allocator counters accompanying a ProfStats reading.

These come from mimalloc v3’s per-heap statistics (mi_heap_stats_get/mi_subproc_stats_get), which the v2 engine did not expose. They are valid even when the profiler is stopped.

Fields

committed: usize

Bytes currently committed from the OS.

reserved: usize

Bytes currently reserved from the OS (always >= committed).

malloc_requested: usize

Bytes the application actually requested and still holds.

Only maintained when the C library was built with MI_STAT >= 2; otherwise this is 0. Check HeapStats::detailed before using it.

pages: usize

Live mimalloc pages.

pages_abandoned: usize

Pages abandoned by exited threads.

heaps: usize

Live first-class heaps.

theaps: usize

Live thread-local heaps. The main thread’s statically-initialized theap is not counted, so a single-threaded process reports 0.

purged: usize

Cumulative bytes purged back to the OS.

detailed: bool

Whether the C library was built with MI_STAT >= 2 (“detailed” statistics), which upstream enables by default only for debug builds. HeapStats::malloc_requested is maintained only at that level; every other field here is maintained at any level.

Without this flag you cannot tell “the application allocated nothing” from “this build does not track that counter”.

Trait Implementations

impl Clone for HeapStats

fn clone(&self) -> HeapStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HeapStats

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

Formats the value using the given formatter.

impl Default for HeapStats

fn default() -> HeapStats

Returns the “default value” for a type.