Function extent_alloc_wrapper

app/redis-6.2.6/deps/jemalloc/src/extent.c:1457–1484

}

extent_t *
extent_alloc_wrapper(tsdn_t *tsdn, arena_t *arena,
    extent_hooks_t **r_extent_hooks, void *new_addr, size_t size, size_t pad,
    size_t alignment, bool slab, szind_t szind, bool *zero, bool *commit) {
	witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn),
	    WITNESS_RANK_CORE, 0);

	extent_hooks_assure_initialized(arena, r_extent_hooks);

	extent_t *extent = extent_alloc_retained(tsdn, arena, r_extent_hooks,
	    new_addr, size, pad, alignment, slab, szind, zero, commit);
	if (extent == NULL) {
		if (opt_retain && new_addr != NULL) {
			/*
			 * When retain is enabled and new_addr is set, we do not
			 * attempt extent_alloc_wrapper_hard which does mmap
			 * that is very unlikely to succeed (unless it happens
			 * to be at the end).
			 */
			return NULL;
		}
		extent = extent_alloc_wrapper_hard(tsdn, arena, r_extent_hooks,
		    new_addr, size, pad, alignment, slab, szind, zero, commit);
	}

	assert(extent == NULL || extent_dumpable_get(extent));
	return extent;
}

static bool
extent_can_coalesce(arena_t *arena, extents_t *extents, const extent_t *inner,