Function malloc_heap_free

dpdk/lib/eal/common/malloc_heap.c:864–1083

}

int
malloc_heap_free(struct malloc_elem *elem)
{
	struct malloc_heap *heap;
	void *start, *aligned_start, *end, *aligned_end;
	size_t len, aligned_len, page_sz;
	struct rte_memseg_list *msl;
	unsigned int i, n_segs, before_space, after_space;
	int ret;
	bool unmapped = false;
	const struct internal_config *internal_conf =
		eal_get_internal_configuration();

	if (!malloc_elem_cookies_ok(elem) || elem->state != ELEM_BUSY)
		return -1;

	asan_clear_redzone(elem);

	/* elem may be merged with previous element, so keep heap address */
	heap = elem->heap;
	msl = elem->msl;
	page_sz = (size_t)msl->page_sz;

	rte_spinlock_lock(&(heap->lock));

	void *asan_ptr = RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN + elem->pad);
	size_t asan_data_len = elem->size - MALLOC_ELEM_OVERHEAD - elem->pad;

	/* mark element as free */
	elem->state = ELEM_FREE;

	elem = malloc_elem_free(elem);

	/* anything after this is a bonus */
	ret = 0;

	/* ...of which we can't avail if we are in legacy mode, or if this is an
	 * externally allocated segment.
	 */
	if (internal_conf->legacy_mem || (msl->external > 0))
		goto free_unlock;

	/* check if we can free any memory back to the system */
	if (elem->size < page_sz)
		goto free_unlock;

	/* if user requested to match allocations, the sizes must match - if not,
	 * we will defer freeing these hugepages until the entire original allocation
	 * can be freed
	 */
	if (internal_conf->match_allocations && elem->size != elem->orig_size)
		goto free_unlock;

	/* probably, but let's make sure, as we may not be using up full page */
	start = elem;
	len = elem->size;
	aligned_start = RTE_PTR_ALIGN_CEIL(start, page_sz);
	end = RTE_PTR_ADD(elem, len);