builtin-top.c

	page_size = sysconf(_SC_PAGE_SIZE);

	argc = parse_options(argc, argv, options, top_usage, 0);
	if (argc)
		usage_with_options(top_usage, options);

	/*
 	 * XXX For now start disabled, only using TUI if explicitely asked for.
 	 * Change that when handle_keys equivalent gets written, live annotation
 	 * done, etc.
 	 */
	use_browser = 0;

	if (use_stdio)
		use_browser = 0;
	else if (use_tui)
		use_browser = 1;

	setup_browser(false);

	/* CPU and PID are mutually exclusive */
	if (top.target_tid > 0 && top.cpu_list) {
		printf("WARNING: PID switch overriding CPU\n");
		sleep(1);
		top.cpu_list = NULL;
	}

	if (top.target_pid != -1)
		top.target_tid = top.target_pid;

	if (perf_evlist__create_maps(top.evlist, top.target_pid,
				     top.target_tid, top.cpu_list) < 0)
		usage_with_options(top_usage, options);

	if (!top.evlist->nr_entries &&
	    perf_evlist__add_default(top.evlist) < 0) {
		pr_err("Not enough memory for event selector list\n");
		return -ENOMEM;
	}

	if (top.delay_secs < 1)
		top.delay_secs = 1;

	/*
	 * User specified count overrides default frequency.
	 */
	if (default_interval)
		top.freq = 0;
	else if (top.freq) {
		default_interval = top.freq;
	} else {
		fprintf(stderr, "frequency and count are zero, aborting\n");
		exit(EXIT_FAILURE);
	}

	list_for_each_entry(pos, &top.evlist->entries, node) {
		if (perf_evsel__alloc_fd(pos, top.evlist->cpus->nr,
					 top.evlist->threads->nr) < 0)
			goto out_free_fd;
		/*
		 * Fill in the ones not specifically initialized via -c:
		 */
		if (pos->attr.sample_period)
			continue;

		pos->attr.sample_period = default_interval;
	}

	if (perf_evlist__alloc_pollfd(top.evlist) < 0 ||
	    perf_evlist__alloc_mmap(top.evlist) < 0)
		goto out_free_fd;

	top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);

	symbol_conf.priv_size = (sizeof(struct sym_entry) + sizeof(struct annotation) +
				 (top.evlist->nr_entries + 1) * sizeof(unsigned long));

	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
	if (symbol__init() < 0)
		return -1;

	get_term_dimensions(&winsize);
	if (top.print_entries == 0) {
		update_print_entries(&winsize);
		signal(SIGWINCH, sig_winch_handler);
	}

	status = __cmd_top();
out_free_fd:
	perf_evlist__delete(top.evlist);

	return status;
}