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ensure we dont reclaim a segment on a free if that would go above the target segment count

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Daan 2024-10-29 22:40:58 -07:00
parent 3f3aee918a
commit 4f46cf7d5a
1 changed files with 2 additions and 0 deletions
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src/segment.c
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@ -1261,6 +1261,8 @@ bool _mi_segment_attempt_reclaim(mi_heap_t* heap, mi_segment_t* segment) {
if (mi_atomic_load_relaxed(&segment->thread_id) != 0) return false; // it is not abandoned
if (segment->subproc != heap->tld->segments.subproc) return false; // only reclaim within the same subprocess
if (!_mi_heap_memid_is_suitable(heap,segment->memid)) return false; // don't reclaim between exclusive and non-exclusive arena's
const long target = _mi_option_get_fast(mi_option_target_segments_per_thread);
if (target > 0 && (size_t)target <= heap->tld->segments.count) return false; // don't reclaim if going above the target count
// don't reclaim more from a `free` call than half the current segments
// this is to prevent a pure free-ing thread to start owning too many segments
// (but not for out-of-arena segments as that is the main way to be reclaimed for those)