Function eal_memalloc_init

dpdk/lib/eal/linux/eal_memalloc.c:1736–1787

}

int
eal_memalloc_init(void)
{
	const struct internal_config *internal_conf =
		eal_get_internal_configuration();

	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
		/*  memory_hotplug_lock is held during initialization, so it's
		 *  safe to call thread-unsafe version.
		 */
		if (rte_memseg_list_walk_thread_unsafe(secondary_msl_create_walk, NULL) < 0)
			return -1;
	if (rte_eal_process_type() == RTE_PROC_PRIMARY &&
			internal_conf->in_memory) {
		int mfd_res = test_memfd_create();

		if (mfd_res < 0) {
			RTE_LOG(ERR, EAL, "Unable to check if memfd is supported\n");
			return -1;
		}
		if (mfd_res == 1)
			RTE_LOG(DEBUG, EAL, "Using memfd for anonymous memory\n");
		else
			RTE_LOG(INFO, EAL, "Using memfd is not supported, falling back to anonymous hugepages\n");

		/* we only support single-file segments mode with in-memory mode
		 * if we support hugetlbfs with memfd_create. this code will
		 * test if we do.
		 */
		if (internal_conf->single_file_segments &&
				mfd_res != 1) {
			RTE_LOG(ERR, EAL, "Single-file segments mode cannot be used without memfd support\n");
			return -1;
		}
		/* this cannot ever happen but better safe than sorry */
		if (!anonymous_hugepages_supported) {
			RTE_LOG(ERR, EAL, "Using anonymous memory is not supported\n");
			return -1;
		}
		/* safety net, should be impossible to configure */
		if (internal_conf->hugepage_file.unlink_before_mapping &&
				!internal_conf->hugepage_file.unlink_existing) {
			RTE_LOG(ERR, EAL, "Unlinking existing hugepage files is prohibited, cannot unlink them before mapping.\n");
			return -1;
		}
	}

	/* initialize all of the fd lists */
	if (rte_memseg_list_walk_thread_unsafe(fd_list_create_walk, NULL))
		return -1;
	return 0;
}