tools/power/cpupower/utils/idle_monitor/cpupower-monitor.c - linux - Git at Google

 /*
  *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
  *
  *  Licensed under the terms of the GNU GPL License version 2.
  *
  *  Output format inspired by Len Brown's <lenb@kernel.org> turbostat tool.
  *
  */


 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <signal.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <libgen.h>

 #include "idle_monitor/cpupower-monitor.h"
 #include "idle_monitor/idle_monitors.h"
 #include "helpers/helpers.h"

 /* Define pointers to all monitors.  */
 #define DEF(x) & x ## _monitor ,
 struct cpuidle_monitor *all_monitors[] = {
 #include "idle_monitors.def"
 0
 };

 static struct cpuidle_monitor *monitors[MONITORS_MAX];
 static unsigned int avail_monitors;

 static char *progname;

 enum operation_mode_e { list = 1, show, show_all };
 static int mode;
 static int interval = 1;
 static char *show_monitors_param;
 static struct cpupower_topology cpu_top;
 static unsigned int wake_cpus;

 /* ToDo: Document this in the manpage */
 static char range_abbr[RANGE_MAX] = { 'T', 'C', 'P', 'M', };

 static void print_wrong_arg_exit(void)
 {
 	printf(_("invalid or unknown argument\n"));
 	exit(EXIT_FAILURE);
 }

 long long timespec_diff_us(struct timespec start, struct timespec end)
 {
 	struct timespec temp;
 	if ((end.tv_nsec - start.tv_nsec) < 0) {
 		temp.tv_sec = end.tv_sec - start.tv_sec - 1;
 		temp.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
 	} else {
 		temp.tv_sec = end.tv_sec - start.tv_sec;
 		temp.tv_nsec = end.tv_nsec - start.tv_nsec;
 	}
 	return (temp.tv_sec * 1000000) + (temp.tv_nsec / 1000);
 }

 void print_n_spaces(int n)
 {
 	int x;
 	for (x = 0; x < n; x++)
 		printf(" ");
 }

 /*s is filled with left and right spaces
  *to make its length atleast n+1
  */
 int fill_string_with_spaces(char *s, int n)
 {
 	char *temp;
 	int len = strlen(s);

 	if (len >= n)
 		return -1;

 	temp = malloc(sizeof(char) * (n+1));
 	for (; len < n; len++)
 		s[len] = ' ';
 	s[len] = '\0';
 	snprintf(temp, n+1, " %s", s);
 	strcpy(s, temp);
 	free(temp);
 	return 0;
 }

 #define MAX_COL_WIDTH 6
 void print_header(int topology_depth)
 {
 	int unsigned mon;
 	int state, need_len;
 	cstate_t s;
 	char buf[128] = "";

 	fill_string_with_spaces(buf, topology_depth * 5 - 1);
 	printf("%s|", buf);

 	for (mon = 0; mon < avail_monitors; mon++) {
 		need_len = monitors[mon]->hw_states_num * (MAX_COL_WIDTH + 1)
 			- 1;
 		if (mon != 0)
 			printf("||");
 		sprintf(buf, "%s", monitors[mon]->name);
 		fill_string_with_spaces(buf, need_len);
 		printf("%s", buf);
 	}
 	printf("\n");

 	if (topology_depth > 2)
 		printf(" PKG|");
 	if (topology_depth > 1)
 		printf("CORE|");
 	if (topology_depth > 0)
 		printf(" CPU|");

 	for (mon = 0; mon < avail_monitors; mon++) {
 		if (mon != 0)
 			printf("||");
 		for (state = 0; state < monitors[mon]->hw_states_num; state++) {
 			if (state != 0)
 				printf("|");
 			s = monitors[mon]->hw_states[state];
 			sprintf(buf, "%s", s.name);
 			fill_string_with_spaces(buf, MAX_COL_WIDTH);
 			printf("%s", buf);
 		}
 		printf(" ");
 	}
 	printf("\n");
 }


 void print_results(int topology_depth, int cpu)
 {
 	unsigned int mon;
 	int state, ret;
 	double percent;
 	unsigned long long result;
 	cstate_t s;

 	/* Be careful CPUs may got resorted for pkg value do not just use cpu */
 	if (!bitmask_isbitset(cpus_chosen, cpu_top.core_info[cpu].cpu))
 		return;
 	if (!cpu_top.core_info[cpu].is_online &&
 	    cpu_top.core_info[cpu].pkg == -1)
 		return;

 	if (topology_depth > 2)
 		printf("%4d|", cpu_top.core_info[cpu].pkg);
 	if (topology_depth > 1)
 		printf("%4d|", cpu_top.core_info[cpu].core);
 	if (topology_depth > 0)
 		printf("%4d|", cpu_top.core_info[cpu].cpu);

 	for (mon = 0; mon < avail_monitors; mon++) {
 		if (mon != 0)
 			printf("||");

 		for (state = 0; state < monitors[mon]->hw_states_num; state++) {
 			if (state != 0)
 				printf("|");

 			s = monitors[mon]->hw_states[state];

 			if (s.get_count_percent) {
 				ret = s.get_count_percent(s.id, &percent,
 						  cpu_top.core_info[cpu].cpu);
 				if (ret)
 					printf("******");
 				else if (percent >= 100.0)
 					printf("%6.1f", percent);
 				else
 					printf("%6.2f", percent);
 			} else if (s.get_count) {
 				ret = s.get_count(s.id, &result,
 						  cpu_top.core_info[cpu].cpu);
 				if (ret)
 					printf("******");
 				else
 					printf("%6llu", result);
 			} else {
 				printf(_("Monitor %s, Counter %s has no count "
 					 "function. Implementation error\n"),
 				       monitors[mon]->name, s.name);
 				exit(EXIT_FAILURE);
 			}
 		}
 	}
 	/*
 	 * The monitor could still provide useful data, for example
 	 * AMD HW counters partly sit in PCI config space.
 	 * It's up to the monitor plug-in to check .is_online, this one
 	 * is just for additional info.
 	 */
 	if (!cpu_top.core_info[cpu].is_online &&
 	    cpu_top.core_info[cpu].pkg != -1) {
 		printf(_(" *is offline\n"));
 		return;
 	} else
 		printf("\n");
 }


 /* param: string passed by -m param (The list of monitors to show)
  *
  * Monitors must have been registered already, matching monitors
  * are picked out and available monitors array is overridden
  * with matching ones
  *
  * Monitors get sorted in the same order the user passes them
 */

 static void parse_monitor_param(char *param)
 {
 	unsigned int num;
 	int mon, hits = 0;
 	char *tmp = param, *token;
 	struct cpuidle_monitor *tmp_mons[MONITORS_MAX];


 	for (mon = 0; mon < MONITORS_MAX; mon++, tmp = NULL) {
 		token = strtok(tmp, ",");
 		if (token == NULL)
 			break;
 		if (strlen(token) >= MONITOR_NAME_LEN) {
 			printf(_("%s: max monitor name length"
 				 " (%d) exceeded\n"), token, MONITOR_NAME_LEN);
 			continue;
 		}

 		for (num = 0; num < avail_monitors; num++) {
 			if (!strcmp(monitors[num]->name, token)) {
 				dprint("Found requested monitor: %s\n", token);
 				tmp_mons[hits] = monitors[num];
 				hits++;
 			}
 		}
 	}
 	if (hits == 0) {
 		printf(_("No matching monitor found in %s, "
 			 "try -l option\n"), param);
 		exit(EXIT_FAILURE);
 	}
 	/* Override detected/registerd monitors array with requested one */
 	memcpy(monitors, tmp_mons,
 		sizeof(struct cpuidle_monitor *) * MONITORS_MAX);
 	avail_monitors = hits;
 }

 void list_monitors(void)
 {
 	unsigned int mon;
 	int state;
 	cstate_t s;

 	for (mon = 0; mon < avail_monitors; mon++) {
 		printf(_("Monitor \"%s\" (%d states) - Might overflow after %u "
 			 "s\n"),
 			monitors[mon]->name, monitors[mon]->hw_states_num,
 			monitors[mon]->overflow_s);

 		for (state = 0; state < monitors[mon]->hw_states_num; state++) {
 			s = monitors[mon]->hw_states[state];
 			/*
 			 * ToDo show more state capabilities:
 			 * percent, time (granlarity)
 			 */
 			printf("%s\t[%c] -> %s\n", s.name, range_abbr[s.range],
 			       gettext(s.desc));
 		}
 	}
 }

 int fork_it(char **argv)
 {
 	int status;
 	unsigned int num;
 	unsigned long long timediff;
 	pid_t child_pid;
 	struct timespec start, end;

 	child_pid = fork();
 	clock_gettime(CLOCK_REALTIME, &start);

 	for (num = 0; num < avail_monitors; num++)
 		monitors[num]->start();

 	if (!child_pid) {
 		/* child */
 		execvp(argv[0], argv);
 	} else {
 		/* parent */
 		if (child_pid == -1) {
 			perror("fork");
 			exit(1);
 		}

 		signal(SIGINT, SIG_IGN);
 		signal(SIGQUIT, SIG_IGN);
 		if (waitpid(child_pid, &status, 0) == -1) {
 			perror("wait");
 			exit(1);
 		}
 	}
 	clock_gettime(CLOCK_REALTIME, &end);
 	for (num = 0; num < avail_monitors; num++)
 		monitors[num]->stop();

 	timediff = timespec_diff_us(start, end);
 	if (WIFEXITED(status))
 		printf(_("%s took %.5f seconds and exited with status %d\n"),
 			argv[0], timediff / (1000.0 * 1000),
 			WEXITSTATUS(status));
 	return 0;
 }

 int do_interval_measure(int i)
 {
 	unsigned int num;
 	int cpu;

 	if (wake_cpus)
 		for (cpu = 0; cpu < cpu_count; cpu++)
 			bind_cpu(cpu);

 	for (num = 0; num < avail_monitors; num++) {
 		dprint("HW C-state residency monitor: %s - States: %d\n",
 		       monitors[num]->name, monitors[num]->hw_states_num);
 		monitors[num]->start();
 	}

 	sleep(i);

 	if (wake_cpus)
 		for (cpu = 0; cpu < cpu_count; cpu++)
 			bind_cpu(cpu);

 	for (num = 0; num < avail_monitors; num++)
 		monitors[num]->stop();


 	return 0;
 }

 static void cmdline(int argc, char *argv[])
 {
 	int opt;
 	progname = basename(argv[0]);

 	while ((opt = getopt(argc, argv, "+lci:m:")) != -1) {
 		switch (opt) {
 		case 'l':
 			if (mode)
 				print_wrong_arg_exit();
 			mode = list;
 			break;
 		case 'i':
 			/* only allow -i with -m or no option */
 			if (mode && mode != show)
 				print_wrong_arg_exit();
 			interval = atoi(optarg);
 			break;
 		case 'm':
 			if (mode)
 				print_wrong_arg_exit();
 			mode = show;
 			show_monitors_param = optarg;
 			break;
 		case 'c':
 			wake_cpus = 1;
 			break;
 		default:
 			print_wrong_arg_exit();
 		}
 	}
 	if (!mode)
 		mode = show_all;
 }

 int cmd_monitor(int argc, char **argv)
 {
 	unsigned int num;
 	struct cpuidle_monitor *test_mon;
 	int cpu;

 	cmdline(argc, argv);
 	cpu_count = get_cpu_topology(&cpu_top);
 	if (cpu_count < 0) {
 		printf(_("Cannot read number of available processors\n"));
 		return EXIT_FAILURE;
 	}

 	if (!cpu_top.core_info[0].is_online)
 		printf("WARNING: at least one cpu is offline\n");

 	/* Default is: monitor all CPUs */
 	if (bitmask_isallclear(cpus_chosen))
 		bitmask_setall(cpus_chosen);

 	dprint("System has up to %d CPU cores\n", cpu_count);

 	for (num = 0; all_monitors[num]; num++) {
 		dprint("Try to register: %s\n", all_monitors[num]->name);
 		test_mon = all_monitors[num]->do_register();
 		if (test_mon) {
 			if (test_mon->needs_root && !run_as_root) {
 				fprintf(stderr, _("Available monitor %s needs "
 					  "root access\n"), test_mon->name);
 				continue;
 			}
 			monitors[avail_monitors] = test_mon;
 			dprint("%s registered\n", all_monitors[num]->name);
 			avail_monitors++;
 		}
 	}

 	if (avail_monitors == 0) {
 		printf(_("No HW Cstate monitors found\n"));
 		return 1;
 	}

 	if (mode == list) {
 		list_monitors();
 		exit(EXIT_SUCCESS);
 	}

 	if (mode == show)
 		parse_monitor_param(show_monitors_param);

 	dprint("Packages: %d - Cores: %d - CPUs: %d\n",
 	       cpu_top.pkgs, cpu_top.cores, cpu_count);

 	/*
 	 * if any params left, it must be a command to fork
 	 */
 	if (argc - optind)
 		fork_it(argv + optind);
 	else
 		do_interval_measure(interval);

 	/* ToDo: Topology parsing needs fixing first to do
 	   this more generically */
 	if (cpu_top.pkgs > 1)
 		print_header(3);
 	else
 		print_header(1);

 	for (cpu = 0; cpu < cpu_count; cpu++) {
 		if (cpu_top.pkgs > 1)
 			print_results(3, cpu);
 		else
 			print_results(1, cpu);
 	}

 	for (num = 0; num < avail_monitors; num++)
 		monitors[num]->unregister();

 	cpu_topology_release(cpu_top);
 	return 0;
 }
	/*
	* (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
	*
	* Licensed under the terms of the GNU GPL License version 2.
	*
	* Output format inspired by Len Brown's <lenb@kernel.org> turbostat tool.
	*
	*/


	#include <stdio.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include <signal.h>
	#include <sys/types.h>
	#include <sys/wait.h>
	#include <libgen.h>

	#include "idle_monitor/cpupower-monitor.h"
	#include "idle_monitor/idle_monitors.h"
	#include "helpers/helpers.h"

	/* Define pointers to all monitors. */
	#define DEF(x) & x ## _monitor ,
	struct cpuidle_monitor *all_monitors[] = {
	#include "idle_monitors.def"
	0
	};

	static struct cpuidle_monitor *monitors[MONITORS_MAX];
	static unsigned int avail_monitors;

	static char *progname;

	enum operation_mode_e { list = 1, show, show_all };
	static int mode;
	static int interval = 1;
	static char *show_monitors_param;
	static struct cpupower_topology cpu_top;
	static unsigned int wake_cpus;

	/* ToDo: Document this in the manpage */
	static char range_abbr[RANGE_MAX] = { 'T', 'C', 'P', 'M', };

	static void print_wrong_arg_exit(void)
	{
	printf(_("invalid or unknown argument\n"));
	exit(EXIT_FAILURE);
	}

	long long timespec_diff_us(struct timespec start, struct timespec end)
	{
	struct timespec temp;
	if ((end.tv_nsec - start.tv_nsec) < 0) {
	temp.tv_sec = end.tv_sec - start.tv_sec - 1;
	temp.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
	} else {
	temp.tv_sec = end.tv_sec - start.tv_sec;
	temp.tv_nsec = end.tv_nsec - start.tv_nsec;
	}
	return (temp.tv_sec * 1000000) + (temp.tv_nsec / 1000);
	}

	void print_n_spaces(int n)
	{
	int x;
	for (x = 0; x < n; x++)
	printf(" ");
	}

	/*s is filled with left and right spaces
	*to make its length atleast n+1
	*/
	int fill_string_with_spaces(char *s, int n)
	{
	char *temp;
	int len = strlen(s);

	if (len >= n)
	return -1;

	temp = malloc(sizeof(char) * (n+1));
	for (; len < n; len++)
	s[len] = ' ';
	s[len] = '\0';
	snprintf(temp, n+1, " %s", s);
	strcpy(s, temp);
	free(temp);
	return 0;
	}

	#define MAX_COL_WIDTH 6
	void print_header(int topology_depth)
	{
	int unsigned mon;
	int state, need_len;
	cstate_t s;
	char buf[128] = "";

	fill_string_with_spaces(buf, topology_depth * 5 - 1);
	printf("%s\|", buf);

	for (mon = 0; mon < avail_monitors; mon++) {
	need_len = monitors[mon]->hw_states_num * (MAX_COL_WIDTH + 1)
	- 1;
	if (mon != 0)
	printf("\|\|");
	sprintf(buf, "%s", monitors[mon]->name);
	fill_string_with_spaces(buf, need_len);
	printf("%s", buf);
	}
	printf("\n");

	if (topology_depth > 2)
	printf(" PKG\|");
	if (topology_depth > 1)
	printf("CORE\|");
	if (topology_depth > 0)
	printf(" CPU\|");

	for (mon = 0; mon < avail_monitors; mon++) {
	if (mon != 0)
	printf("\|\|");
	for (state = 0; state < monitors[mon]->hw_states_num; state++) {
	if (state != 0)
	printf("\|");
	s = monitors[mon]->hw_states[state];
	sprintf(buf, "%s", s.name);
	fill_string_with_spaces(buf, MAX_COL_WIDTH);
	printf("%s", buf);
	}
	printf(" ");
	}
	printf("\n");
	}


	void print_results(int topology_depth, int cpu)
	{
	unsigned int mon;
	int state, ret;
	double percent;
	unsigned long long result;
	cstate_t s;

	/* Be careful CPUs may got resorted for pkg value do not just use cpu */
	if (!bitmask_isbitset(cpus_chosen, cpu_top.core_info[cpu].cpu))
	return;
	if (!cpu_top.core_info[cpu].is_online &&
	cpu_top.core_info[cpu].pkg == -1)
	return;

	if (topology_depth > 2)
	printf("%4d\|", cpu_top.core_info[cpu].pkg);
	if (topology_depth > 1)
	printf("%4d\|", cpu_top.core_info[cpu].core);
	if (topology_depth > 0)
	printf("%4d\|", cpu_top.core_info[cpu].cpu);

	for (mon = 0; mon < avail_monitors; mon++) {
	if (mon != 0)
	printf("\|\|");

	for (state = 0; state < monitors[mon]->hw_states_num; state++) {
	if (state != 0)
	printf("\|");

	s = monitors[mon]->hw_states[state];

	if (s.get_count_percent) {
	ret = s.get_count_percent(s.id, &percent,
	cpu_top.core_info[cpu].cpu);
	if (ret)
	printf("******");
	else if (percent >= 100.0)
	printf("%6.1f", percent);
	else
	printf("%6.2f", percent);
	} else if (s.get_count) {
	ret = s.get_count(s.id, &result,
	cpu_top.core_info[cpu].cpu);
	if (ret)
	printf("******");
	else
	printf("%6llu", result);
	} else {
	printf(_("Monitor %s, Counter %s has no count "
	"function. Implementation error\n"),
	monitors[mon]->name, s.name);
	exit(EXIT_FAILURE);
	}
	}
	}
	/*
	* The monitor could still provide useful data, for example
	* AMD HW counters partly sit in PCI config space.
	* It's up to the monitor plug-in to check .is_online, this one
	* is just for additional info.
	*/
	if (!cpu_top.core_info[cpu].is_online &&
	cpu_top.core_info[cpu].pkg != -1) {
	printf(_(" *is offline\n"));
	return;
	} else
	printf("\n");
	}


	/* param: string passed by -m param (The list of monitors to show)
	*
	* Monitors must have been registered already, matching monitors
	* are picked out and available monitors array is overridden
	* with matching ones
	*
	* Monitors get sorted in the same order the user passes them
	*/

	static void parse_monitor_param(char *param)
	{
	unsigned int num;
	int mon, hits = 0;
	char tmp = param, token;
	struct cpuidle_monitor *tmp_mons[MONITORS_MAX];


	for (mon = 0; mon < MONITORS_MAX; mon++, tmp = NULL) {
	token = strtok(tmp, ",");
	if (token == NULL)
	break;
	if (strlen(token) >= MONITOR_NAME_LEN) {
	printf(_("%s: max monitor name length"
	" (%d) exceeded\n"), token, MONITOR_NAME_LEN);
	continue;
	}

	for (num = 0; num < avail_monitors; num++) {
	if (!strcmp(monitors[num]->name, token)) {
	dprint("Found requested monitor: %s\n", token);
	tmp_mons[hits] = monitors[num];
	hits++;
	}
	}
	}
	if (hits == 0) {
	printf(_("No matching monitor found in %s, "
	"try -l option\n"), param);
	exit(EXIT_FAILURE);
	}
	/* Override detected/registerd monitors array with requested one */
	memcpy(monitors, tmp_mons,
	sizeof(struct cpuidle_monitor ) MONITORS_MAX);
	avail_monitors = hits;
	}

	void list_monitors(void)
	{
	unsigned int mon;
	int state;
	cstate_t s;

	for (mon = 0; mon < avail_monitors; mon++) {
	printf(_("Monitor \"%s\" (%d states) - Might overflow after %u "
	"s\n"),
	monitors[mon]->name, monitors[mon]->hw_states_num,
	monitors[mon]->overflow_s);

	for (state = 0; state < monitors[mon]->hw_states_num; state++) {
	s = monitors[mon]->hw_states[state];
	/*
	* ToDo show more state capabilities:
	* percent, time (granlarity)
	*/
	printf("%s\t[%c] -> %s\n", s.name, range_abbr[s.range],
	gettext(s.desc));
	}
	}
	}

	int fork_it(char **argv)
	{
	int status;
	unsigned int num;
	unsigned long long timediff;
	pid_t child_pid;
	struct timespec start, end;

	child_pid = fork();
	clock_gettime(CLOCK_REALTIME, &start);

	for (num = 0; num < avail_monitors; num++)
	monitors[num]->start();

	if (!child_pid) {
	/* child */
	execvp(argv[0], argv);
	} else {
	/* parent */
	if (child_pid == -1) {
	perror("fork");
	exit(1);
	}

	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	if (waitpid(child_pid, &status, 0) == -1) {
	perror("wait");
	exit(1);
	}
	}
	clock_gettime(CLOCK_REALTIME, &end);
	for (num = 0; num < avail_monitors; num++)
	monitors[num]->stop();

	timediff = timespec_diff_us(start, end);
	if (WIFEXITED(status))
	printf(_("%s took %.5f seconds and exited with status %d\n"),
	argv[0], timediff / (1000.0 * 1000),
	WEXITSTATUS(status));
	return 0;
	}

	int do_interval_measure(int i)
	{
	unsigned int num;
	int cpu;

	if (wake_cpus)
	for (cpu = 0; cpu < cpu_count; cpu++)
	bind_cpu(cpu);

	for (num = 0; num < avail_monitors; num++) {
	dprint("HW C-state residency monitor: %s - States: %d\n",
	monitors[num]->name, monitors[num]->hw_states_num);
	monitors[num]->start();
	}

	sleep(i);

	if (wake_cpus)
	for (cpu = 0; cpu < cpu_count; cpu++)
	bind_cpu(cpu);

	for (num = 0; num < avail_monitors; num++)
	monitors[num]->stop();


	return 0;
	}

	static void cmdline(int argc, char *argv[])
	{
	int opt;
	progname = basename(argv[0]);

	while ((opt = getopt(argc, argv, "+lci:m:")) != -1) {
	switch (opt) {
	case 'l':
	if (mode)
	print_wrong_arg_exit();
	mode = list;
	break;
	case 'i':
	/* only allow -i with -m or no option */
	if (mode && mode != show)
	print_wrong_arg_exit();
	interval = atoi(optarg);
	break;
	case 'm':
	if (mode)
	print_wrong_arg_exit();
	mode = show;
	show_monitors_param = optarg;
	break;
	case 'c':
	wake_cpus = 1;
	break;
	default:
	print_wrong_arg_exit();
	}
	}
	if (!mode)
	mode = show_all;
	}

	int cmd_monitor(int argc, char **argv)
	{
	unsigned int num;
	struct cpuidle_monitor *test_mon;
	int cpu;

	cmdline(argc, argv);
	cpu_count = get_cpu_topology(&cpu_top);
	if (cpu_count < 0) {
	printf(_("Cannot read number of available processors\n"));
	return EXIT_FAILURE;
	}

	if (!cpu_top.core_info[0].is_online)
	printf("WARNING: at least one cpu is offline\n");

	/* Default is: monitor all CPUs */
	if (bitmask_isallclear(cpus_chosen))
	bitmask_setall(cpus_chosen);

	dprint("System has up to %d CPU cores\n", cpu_count);

	for (num = 0; all_monitors[num]; num++) {
	dprint("Try to register: %s\n", all_monitors[num]->name);
	test_mon = all_monitors[num]->do_register();
	if (test_mon) {
	if (test_mon->needs_root && !run_as_root) {
	fprintf(stderr, _("Available monitor %s needs "
	"root access\n"), test_mon->name);
	continue;
	}
	monitors[avail_monitors] = test_mon;
	dprint("%s registered\n", all_monitors[num]->name);
	avail_monitors++;
	}
	}

	if (avail_monitors == 0) {
	printf(_("No HW Cstate monitors found\n"));
	return 1;
	}

	if (mode == list) {
	list_monitors();
	exit(EXIT_SUCCESS);
	}

	if (mode == show)
	parse_monitor_param(show_monitors_param);

	dprint("Packages: %d - Cores: %d - CPUs: %d\n",
	cpu_top.pkgs, cpu_top.cores, cpu_count);

	/*
	* if any params left, it must be a command to fork
	*/
	if (argc - optind)
	fork_it(argv + optind);
	else
	do_interval_measure(interval);

	/* ToDo: Topology parsing needs fixing first to do
	this more generically */
	if (cpu_top.pkgs > 1)
	print_header(3);
	else
	print_header(1);

	for (cpu = 0; cpu < cpu_count; cpu++) {
	if (cpu_top.pkgs > 1)
	print_results(3, cpu);
	else
	print_results(1, cpu);
	}

	for (num = 0; num < avail_monitors; num++)
	monitors[num]->unregister();

	cpu_topology_release(cpu_top);
	return 0;
	}