Function zone_size

app/redis-6.2.6/deps/jemalloc/src/zone.c:132–144

 */

static size_t
zone_size(malloc_zone_t *zone, const void *ptr) {
	/*
	 * There appear to be places within Darwin (such as setenv(3)) that
	 * cause calls to this function with pointers that *no* zone owns.  If
	 * we knew that all pointers were owned by *some* zone, we could split
	 * our zone into two parts, and use one as the default allocator and
	 * the other as the default deallocator/reallocator.  Since that will
	 * not work in practice, we must check all pointers to assure that they
	 * reside within a mapped extent before determining size.
	 */
	return ivsalloc(tsdn_fetch(), ptr);
}

static void *
zone_malloc(malloc_zone_t *zone, size_t size) {