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perf: check global cache before extracting from reserved memory (#323)

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The allocator should check the global cache for an available span
before extracting a span of memory from the reserved memory to avoid
cache bloating. Besides, extracting from reserved memory eagerly may
also increase the degree of memory fragmentation.
This commit is contained in:
FujiZ
2024-04-01 02:32:55 +08:00
committed by GitHub
parent b41aa177fc
commit a9904521c3
1 changed files with 6 additions and 6 deletions
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12
rpmalloc/rpmalloc.c
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@@ -1858,18 +1858,18 @@ _rpmalloc_heap_extract_new_span(heap_t* heap, heap_size_class_t* heap_size_class
_rpmalloc_inc_span_statistics(heap, span_count, class_idx);
return span;
}
span = _rpmalloc_heap_reserved_extract(heap, span_count);
if (EXPECTED(span != 0)) {
_rpmalloc_stat_inc(&heap->size_class_use[class_idx].spans_from_reserved);
_rpmalloc_inc_span_statistics(heap, span_count, class_idx);
return span;
}
span = _rpmalloc_heap_global_cache_extract(heap, span_count);
if (EXPECTED(span != 0)) {
_rpmalloc_stat_inc(&heap->size_class_use[class_idx].spans_from_cache);
_rpmalloc_inc_span_statistics(heap, span_count, class_idx);
return span;
}
span = _rpmalloc_heap_reserved_extract(heap, span_count);
if (EXPECTED(span != 0)) {
_rpmalloc_stat_inc(&heap->size_class_use[class_idx].spans_from_reserved);
_rpmalloc_inc_span_statistics(heap, span_count, class_idx);
return span;
}
++span_count;
} while (span_count <= limit_span_count);
//Final fallback, map in more virtual memory