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Free cached chunks when the requested memory limit is above real usage

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This commit is contained in:
Dmitry Stogov 2022-02-08 15:45:40 +03:00
parent 1d48da6da5
commit c035298eb2
1 changed files with 14 additions and 1 deletions
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15
Zend/zend_alloc.c
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@ -2660,10 +2660,23 @@ ZEND_API char* ZEND_FASTCALL zend_strndup(const char *s, size_t length)
ZEND_API zend_result zend_set_memory_limit_ex(size_t memory_limit)
{
#if ZEND_MM_LIMIT
zend_mm_heap *heap = AG(mm_heap);
if (memory_limit < ZEND_MM_CHUNK_SIZE) {
memory_limit = ZEND_MM_CHUNK_SIZE;
}
if (UNEXPECTED(memory_limit < AG(mm_heap)->real_size)) {
if (UNEXPECTED(memory_limit < heap->real_size)) {
if (memory_limit >= heap->real_size - heap->cached_chunks_count * ZEND_MM_CHUNK_SIZE) {
/* free some cached chunks to fit into new memory limit */
do {
zend_mm_chunk *p = heap->cached_chunks;
heap->cached_chunks = p->next;
zend_mm_chunk_free(heap, p, ZEND_MM_CHUNK_SIZE);
heap->cached_chunks_count--;
heap->real_size -= ZEND_MM_CHUNK_SIZE;
} while (memory_limit < heap->real_size);
return SUCCESS;
}
return FAILURE;
}
AG(mm_heap)->limit = memory_limit;