Function alloc_seg

dpdk/lib/eal/linux/eal_memalloc.c:514–733

}

static int
alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
		struct hugepage_info *hi, unsigned int list_idx,
		unsigned int seg_idx)
{
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
	int cur_socket_id = 0;
#endif
	uint64_t map_offset;
	rte_iova_t iova;
	void *va;
	char path[PATH_MAX];
	int ret = 0;
	int fd;
	bool dirty;
	size_t alloc_sz;
	int flags;
	void *new_addr;
	const struct internal_config *internal_conf =
		eal_get_internal_configuration();

	alloc_sz = hi->hugepage_sz;

	/* these are checked at init, but code analyzers don't know that */
	if (internal_conf->in_memory && !anonymous_hugepages_supported) {
		RTE_LOG(ERR, EAL, "Anonymous hugepages not supported, in-memory mode cannot allocate memory\n");
		return -1;
	}
	if (internal_conf->in_memory && !memfd_create_supported &&
			internal_conf->single_file_segments) {
		RTE_LOG(ERR, EAL, "Single-file segments are not supported without memfd support\n");
		return -1;
	}

	/* in-memory without memfd is a special case */
	int mmap_flags;

	if (internal_conf->in_memory && !memfd_create_supported) {
		const int in_memory_flags = MAP_HUGETLB | MAP_FIXED |
				MAP_PRIVATE | MAP_ANONYMOUS;
		int pagesz_flag;

		pagesz_flag = pagesz_flags(alloc_sz);
		fd = -1;
		dirty = false;
		mmap_flags = in_memory_flags | pagesz_flag;

		/* single-file segments codepath will never be active
		 * here because in-memory mode is incompatible with the
		 * fallback path, and it's stopped at EAL initialization
		 * stage.
		 */
		map_offset = 0;
	} else {
		/* takes out a read lock on segment or segment list */
		fd = get_seg_fd(path, sizeof(path), hi, list_idx, seg_idx,
				&dirty);
		if (fd < 0) {