← Commit list

23e8c08fa

Marek Polacek

2010-07-21

FAILED Duration: 41s

Subject

mpstat: new applet. ~5.5k

Binary

No binary (build failed)

Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

—

Build Log

(log yok)

Commit Diff GitHub →

procps/mpstat.c +1024 -0

procps/mpstat.c+1024 -0

@@ -0,0 +1,1024 @@
+	/* vi: set sw=4 ts=4: */
+	/*
+	* Per-processor statistics, based on sysstat version 9.1.2 by Sebastien Godard
+	*
+	* Copyright (C) 2010 Marek Polacek <[email protected]>
+	*
+	* Licensed under GPLv2, see file License in this tarball for details.
+	*/
+
+	//applet:IF_MPSTAT(APPLET(mpstat, _BB_DIR_BIN, _BB_SUID_DROP))
+
+	//kbuild:lib-$(CONFIG_MPSTAT) += mpstat.o
+
+	//config:config MPSTAT
+	//config: bool "mpstat"
+	//config: default y
+	//config: help
+	//config: Per-processor statistics
+
+	#include "libbb.h"
+	#include <sys/utsname.h> /* struct utsname */
+
+	//#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
+	#define debug(fmt, ...) ((void)0)
+
+	/* Size of /proc/interrupts line, CPU data excluded */
+	#define INTERRUPTS_LINE 64
+	/* Maximum number of interrupts */
+	#define NR_IRQS 256
+	#define NR_IRQCPU_PREALLOC 3
+	#define MAX_IRQ_LEN 16
+	#define MAX_PF_NAME 512
+
+	/* System files */
+	#define SYSFS_DEVCPU "/sys/devices/system/cpu"
+	#define PROCFS_STAT "/proc/stat"
+	#define PROCFS_INTERRUPTS "/proc/interrupts"
+	#define PROCFS_SOFTIRQS "/proc/softirqs"
+	#define PROCFS_UPTIME "/proc/uptime"
+
+
+	#if 1
+	typedef unsigned long long data_t;
+	typedef long long idata_t;
+	#define FMT_DATA "ll"
+	#define DATA_MAX ULLONG_MAX
+	#else
+	typedef unsigned long data_t;
+	typedef long idata_t;
+	#define FMT_DATA "l"
+	#define DATA_MAX ULONG_MAX
+	#endif
+
+
+	struct stats_irqcpu {
+	unsigned interrupt;
+	char irq_name[MAX_IRQ_LEN];
+	};
+
+	/* Structure for CPU statistics */
+	struct stats_cpu {
+	data_t cpu_user;
+	data_t cpu_nice;
+	data_t cpu_system;
+	data_t cpu_idle;
+	data_t cpu_iowait;
+	data_t cpu_steal;
+	data_t cpu_irq;
+	data_t cpu_softirq;
+	data_t cpu_guest;
+	};
+
+	/* Struct for interrupts statistics */
+	struct stats_irq {
+	data_t irq_nr;
+	};
+
+
+	/* Globals. Try to sort by size. */
+	struct globals {
+	int interval;
+	int count;
+	unsigned cpu_nr; /* Number of CPUs */
+	unsigned irqcpu_nr; /* Number of interrupts per CPU */
+	unsigned softirqcpu_nr; /* Number of soft interrupts per CPU */
+	unsigned options;
+	unsigned hz;
+	unsigned cpu_bitmap_len;
+	smallint p_option;
+	smallint header_done;
+	smallint avg_header_done;
+	unsigned char cpu_bitmap; / Bit 0: global, bit 1: 1st proc... */
+	data_t global_uptime[3];
+	data_t per_cpu_uptime[3];
+	struct stats_cpu *st_cpu[3];
+	struct stats_irq *st_irq[3];
+	struct stats_irqcpu *st_irqcpu[3];
+	struct stats_irqcpu *st_softirqcpu[3];
+	struct tm timestamp[3];
+	};
+	#define G (*ptr_to_globals)
+	#define INIT_G() do { \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+	} while (0)
+
+	/* The selected interrupts statistics (bits in G.options) */
+	enum {
+	D_CPU = 1 << 0,
+	D_IRQ_SUM = 1 << 1,
+	D_IRQ_CPU = 1 << 2,
+	D_SOFTIRQS = 1 << 3,
+	};
+
+
+	/* Does str start with "cpu"? */
+	static int starts_with_cpu(const char *str)
+	{
+	return !((str[0] - 'c') \| (str[1] - 'p') \| (str[2] - 'u'));
+	}
+
+	/* Is option on? */
+	static ALWAYS_INLINE int display_opt(int opt)
+	{
+	return (opt & G.options);
+	}
+
+	#if DATA_MAX > 0xffffffff
+	/*
+	* Handle overflow conditions properly for counters which can have
+	* less bits than data_t, depending on the kernel version.
+	*/
+	/* Surprisingly, on 32bit inlining is a size win */
+	static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
+	{
+	data_t v = curr - prev;
+
+	if ((idata_t)v < 0 /* curr < prev - counter overflow? */
+	&& prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
+	) {
+	/* Add 33th bit set to 1 to curr, compensating for the overflow */
+	/* double shift defeats "warning: left shift count >= width of type" */
+	v += ((data_t)1 << 16) << 16;
+	}
+	return v;
+	}
+	#else
+	static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
+	{
+	return curr - prev;
+	}
+	#endif
+
+	static double percent_value(data_t prev, data_t curr, data_t itv)
+	{
+	return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
+	}
+
+	static double hz_value(data_t prev, data_t curr, data_t itv)
+	{
+	return ((double)overflow_safe_sub(prev, curr)) / itv * G.hz;
+	}
+
+	static ALWAYS_INLINE data_t jiffies_diff(data_t old, data_t new)
+	{
+	data_t diff = new - old;
+	return (diff == 0) ? 1 : diff;
+	}
+
+	static int is_cpu_in_bitmap(unsigned cpu)
+	{
+	return G.cpu_bitmap[cpu >> 3] & (1 << (cpu & 7));
+	}
+
+	static void write_irqcpu_stats(struct stats_irqcpu *per_cpu_stats[],
+	int total_irqs,
+	data_t itv,
+	int prev, int current,
+	const char prev_str, const char current_str)
+	{
+	int j;
+	int offset, cpu;
+	struct stats_irqcpu p0, q0;
+
+	/* Check if number of IRQs has changed */
+	if (G.interval != 0) {
+	for (j = 0; j <= total_irqs; j++) {
+	p0 = &per_cpu_stats[current][j];
+	if (p0->irq_name[0] != '\0') {
+	q0 = &per_cpu_stats[prev][j];
+	if (strcmp(p0->irq_name, q0->irq_name) != 0) {
+	/* Strings are different */
+	break;
+	}
+	}
+	}
+	}
+
+	/* Print header */
+	printf("\n%-11s CPU", prev_str);
+	for (j = 0; j < total_irqs; j++) {
+	p0 = &per_cpu_stats[current][j];
+	if (p0->irq_name[0] != '\0')
+	printf(" %8s/s", p0->irq_name);
+	}
+	bb_putchar('\n');
+
+	for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
+	/* Check if we want stats about this CPU */
+	if (!is_cpu_in_bitmap(cpu) && G.p_option) {
+	continue;
+	}
+
+	printf("%-11s %4u", current_str, cpu - 1);
+
+	for (j = 0; j < total_irqs; j++) {
+	/* IRQ field set only for proc 0 */
+	p0 = &per_cpu_stats[current][j];
+
+	/*
+	* An empty string for irq name means that
+	* interrupt is no longer used.
+	*/
+	if (p0->irq_name[0] != '\0') {
+	offset = j;
+	q0 = &per_cpu_stats[prev][offset];
+
+	/*
+	* If we want stats for the time since boot
+	* we have p0->irq != q0->irq.
+	*/
+	if (strcmp(p0->irq_name, q0->irq_name) != 0
+	&& G.interval != 0
+	) {
+	if (j) {
+	offset = j - 1;
+	q0 = &per_cpu_stats[prev][offset];
+	}
+	if (strcmp(p0->irq_name, q0->irq_name) != 0
+	&& (j + 1 < total_irqs)
+	) {
+	offset = j + 1;
+	q0 = &per_cpu_stats[prev][offset];
+	}
+	}
+
+	if (strcmp(p0->irq_name, q0->irq_name) == 0
+	\|\| G.interval == 0
+	) {
+	struct stats_irqcpu p, q;
+	p = &per_cpu_stats[current][(cpu - 1) * total_irqs + j];
+	q = &per_cpu_stats[prev][(cpu - 1) * total_irqs + offset];
+	printf(" %10.2f",
+	(double)(p->interrupt - q->interrupt) / itv * G.hz);
+	} else {
+	printf(" N/A");
+	}
+	}
+	}
+	bb_putchar('\n');
+	}
+	}
+
+	static data_t get_per_cpu_interval(const struct stats_cpu *scc,
+	const struct stats_cpu *scp)
+	{
+	return ((scc->cpu_user + scc->cpu_nice +
+	scc->cpu_system + scc->cpu_iowait +
+	scc->cpu_idle + scc->cpu_steal +
+	scc->cpu_irq + scc->cpu_softirq) -
+	(scp->cpu_user + scp->cpu_nice +
+	scp->cpu_system + scp->cpu_iowait +
+	scp->cpu_idle + scp->cpu_steal +
+	scp->cpu_irq + scp->cpu_softirq));
+	}
+
+	static void print_stats_cpu_struct(const struct stats_cpu *p,
+	const struct stats_cpu *c,
+	data_t itv)
+	{
+	printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
+	percent_value(p->cpu_user - p->cpu_guest,
+	/**/ c->cpu_user - c->cpu_guest, itv),
+	percent_value(p->cpu_nice , c->cpu_nice , itv),
+	percent_value(p->cpu_system , c->cpu_system , itv),
+	percent_value(p->cpu_iowait , c->cpu_iowait , itv),
+	percent_value(p->cpu_irq , c->cpu_irq , itv),
+	percent_value(p->cpu_softirq, c->cpu_softirq, itv),
+	percent_value(p->cpu_steal , c->cpu_steal , itv),
+	percent_value(p->cpu_guest , c->cpu_guest , itv),
+	percent_value(p->cpu_idle , c->cpu_idle , itv)
+	);
+	}
+
+	static void write_stats_core(int prev, int current,
+	const char prev_str, const char current_str)
+	{
+	struct stats_cpu scc, scp;
+	data_t itv, global_itv;
+	int cpu;
+
+	/* Compute time interval */
+	itv = global_itv = jiffies_diff(G.global_uptime[prev], G.global_uptime[current]);
+
+	/* Reduce interval to one CPU */
+	if (G.cpu_nr > 1)
+	itv = jiffies_diff(G.per_cpu_uptime[prev], G.per_cpu_uptime[current]);
+
+	/* Print CPU stats */
+	if (display_opt(D_CPU)) {
+
+	/* This is done exactly once */
+	if (!G.header_done) {
+	printf("\n%-11s CPU %%usr %%nice %%sys %%iowait %%irq %%soft %%steal %%guest %%idle\n",
+	prev_str
+	);
+	G.header_done = 1;
+	}
+
+	for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
+	data_t per_cpu_itv;
+
+	/* Print stats about this particular CPU? */
+	if (!is_cpu_in_bitmap(cpu))
+	continue;
+
+	scc = &G.st_cpu[current][cpu];
+	scp = &G.st_cpu[prev][cpu];
+	per_cpu_itv = global_itv;
+
+	printf((cpu ? "%-11s %4u" : "%-11s all"), current_str, cpu - 1);
+	if (cpu) {
+	double idle;
+	/*
+	* If the CPU is offline, then it isn't in /proc/stat,
+	* so all values are 0.
+	* NB: Guest time is already included in user time.
+	*/
+	if ((scc->cpu_user \| scc->cpu_nice \| scc->cpu_system \|
+	scc->cpu_iowait \| scc->cpu_idle \| scc->cpu_steal \|
+	scc->cpu_irq \| scc->cpu_softirq) == 0
+	) {
+	/*
+	* Set current struct fields to values from prev.
+	* iteration. Then their values won't jump from
+	* zero, when the CPU comes back online.
+	*/
+	scc = scp;
+	idle = 0.0;
+	goto print_zeros;
+	}
+	/* Compute interval again for current proc */
+	per_cpu_itv = get_per_cpu_interval(scc, scp);
+	if (per_cpu_itv == 0) {
+	/*
+	* If the CPU is tickless then there is no change in CPU values
+	* but the sum of values is not zero.
+	*/
+	idle = 100.0;
+	print_zeros:
+	printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
+	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, idle);
+	continue;
+	}
+	}
+	print_stats_cpu_struct(scp, scc, per_cpu_itv);
+	}
+	}
+
+	/* Print total number of IRQs per CPU */
+	if (display_opt(D_IRQ_SUM)) {
+
+	/* Print average header, this is done exactly once */
+	if (!G.avg_header_done) {
+	printf("\n%-11s CPU intr/s\n", prev_str);
+	G.avg_header_done = 1;
+	}
+
+	for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
+	data_t per_cpu_itv;
+
+	/* Print stats about this CPU? */
+	if (!is_cpu_in_bitmap(cpu))
+	continue;
+
+	per_cpu_itv = itv;
+	printf((cpu ? "%-11s %4u" : "%-11s all"), current_str, cpu - 1);
+	if (cpu) {
+	scc = &G.st_cpu[current][cpu];
+	scp = &G.st_cpu[prev][cpu];
+	/* Compute interval again for current proc */
+	per_cpu_itv = get_per_cpu_interval(scc, scp);
+	if (per_cpu_itv == 0) {
+	printf(" %9.2f\n", 0.0);
+	continue;
+	}
+	}
+	printf(" %9.2f\n", hz_value(G.st_irq[prev][cpu].irq_nr, G.st_irq[current][cpu].irq_nr, per_cpu_itv));
+	}
+	}
+
+	if (display_opt(D_IRQ_CPU)) {
+	write_irqcpu_stats(G.st_irqcpu, G.irqcpu_nr,
+	itv,
+	prev, current,
+	prev_str, current_str
+	);
+	}
+
+	if (display_opt(D_SOFTIRQS)) {
+	write_irqcpu_stats(G.st_softirqcpu, G.softirqcpu_nr,
+	itv,
+	prev, current,
+	prev_str, current_str
+	);
+	}
+	}
+
+	/*
+	* Print the statistics
+	*/
+	static void write_stats(int current)
+	{
+	char prev_time[16];
+	char curr_time[16];
+
+	strftime(prev_time, sizeof(prev_time), "%X", &G.timestamp[!current]);
+	strftime(curr_time, sizeof(curr_time), "%X", &G.timestamp[current]);
+
+	write_stats_core(!current, current, prev_time, curr_time);
+	}
+
+	static void write_stats_avg(int current)
+	{
+	write_stats_core(2, current, "Average:", "Average:");
+	}
+
+	/*
+	* Read CPU statistics
+	*/
+	static void get_cpu_statistics(struct stats_cpu cpu, data_t up, data_t *up0)
+	{
+	FILE *fp;
+	char buf[1024];
+
+	fp = xfopen_for_read(PROCFS_STAT);
+
+	while (fgets(buf, sizeof(buf), fp)) {
+	data_t sum;
+	unsigned cpu_number;
+	struct stats_cpu *cp;
+
+	if (!starts_with_cpu(buf))
+	continue; /* not "cpu" */
+	if (buf[3] == ' ') {
+	/* "cpu " */
+	cp = cpu;
+	} else {
+	/* "cpuN" */
+	if (G.cpu_nr == 0
+	\|\| sscanf(buf + 3, "%u ", &cpu_number) != 1
+	\|\| cpu_number >= G.cpu_nr
+	) {
+	continue;
+	}
+	cp = &cpu[cpu_number + 1];
+	}
+
+	/* Read the jiffies, save them */
+	/* Not all fields have to be present */
+	memset(cp, 0, sizeof(*cp));
+	sscanf(skip_non_whitespace(buf + 3),
+	" %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
+	" %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
+	" %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u",
+	&cp->cpu_user, &cp->cpu_nice, &cp->cpu_system,
+	&cp->cpu_idle, &cp->cpu_iowait, &cp->cpu_irq,
+	&cp->cpu_softirq, &cp->cpu_steal,
+	&cp->cpu_guest
+	);
+	/*
+	* Compute uptime in jiffies (1/HZ), it'll be the sum of
+	* individual CPU's uptimes.
+	* NB: We have to omit cpu_guest, because cpu_user includes it.
+	*/
+	sum = cp->cpu_user + cp->cpu_nice + cp->cpu_system +
+	cp->cpu_idle + cp->cpu_iowait + cp->cpu_irq +
+	cp->cpu_softirq + cp->cpu_steal;
+
+	if (buf[3] == ' ') {
+	/* "cpu " */
+	*up = sum;
+	} else {
+	/* "cpuN" */
+	if (cpu_number == 0 && *up0 != 0) {
+	/* Compute uptime of single CPU */
+	*up0 = sum;
+	}
+	}
+	}
+	fclose(fp);
+	}
+
+	/*
+	* Read IRQs from /proc/stat
+	*/
+	static void get_irqs_from_stat(struct stats_irq *irq)
+	{
+	FILE *fp;
+	char buf[1024];
+
+	fp = fopen_for_read(PROCFS_STAT);
+	if (!fp)
+	return;
+
+	while (fgets(buf, sizeof(buf), fp)) {
+	if (strncmp(buf, "intr ", 5) == 0)
+	/* Read total number of IRQs since system boot */
+	sscanf(buf + 5, "%"FMT_DATA"u", &irq->irq_nr);
+	}
+
+	fclose(fp);
+	}
+
+	/*
+	* Read stats from /proc/interrupts or /proc/softirqs
+	*/
+	static void get_irqs_from_interrupts(const char *fname,
+	struct stats_irqcpu *per_cpu_stats[],
+	int irqs_per_cpu, int current)
+	{
+	FILE *fp;
+	struct stats_irq *irq_i;
+	struct stats_irqcpu *ic;
+	char *buf;
+	unsigned buflen;
+	unsigned cpu;
+	unsigned irq;
+	int cpu_index[G.cpu_nr];
+	int iindex;
+	int len, digit;
+
+	for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
+	irq_i = &G.st_irq[current][cpu];
+	irq_i->irq_nr = 0;
+	}
+
+	fp = fopen_for_read(fname);
+	if (!fp)
+	return;
+
+	buflen = INTERRUPTS_LINE + 16 * G.cpu_nr;
+	buf = xmalloc(buflen);
+
+	/* Parse header and determine, which CPUs are online */
+	iindex = 0;
+	while (fgets(buf, buflen, fp)) {
+	char cp, next;
+	next = buf;
+	while ((cp = strstr(next, "CPU")) != NULL
+	&& iindex < G.cpu_nr
+	) {
+	cpu = strtoul(cp + 3, &next, 10);
+	cpu_index[iindex++] = cpu;
+	}
+	if (iindex) /* We found header */
+	break;
+	}
+
+	irq = 0;
+	while (fgets(buf, buflen, fp)
+	&& irq < irqs_per_cpu
+	) {
+	char *cp;
+	/* Skip over "<irq>:" */
+	cp = strchr(buf, ':');
+	if (!cp)
+	continue;
+
+	ic = &per_cpu_stats[current][irq];
+	len = cp - buf;
+	if (len > sizeof(ic->irq_name)) {
+	len = sizeof(ic->irq_name);
+	}
+	safe_strncpy(ic->irq_name, buf, len);
+	digit = isdigit(buf[len - 1]);
+	cp++;
+
+	for (cpu = 0; cpu < iindex; cpu++) {
+	char *next;
+	ic = &per_cpu_stats[current][cpu_index[cpu] * irqs_per_cpu + irq];
+	irq_i = &G.st_irq[current][cpu_index[cpu] + 1];
+	ic->interrupt = strtoul(cp, &next, 10);
+	if (digit) {
+	/* Do not count non-numerical IRQs */
+	irq_i->irq_nr += ic->interrupt;
+	}
+	cp = next;
+	}
+	irq++;
+	}
+	fclose(fp);
+	free(buf);
+
+	while (irq < irqs_per_cpu) {
+	/* Number of interrupts per CPU has changed */
+	ic = &per_cpu_stats[current][irq];
+	ic->irq_name[0] = '\0'; /* False interrupt */
+	irq++;
+	}
+	}
+
+	static void get_uptime(data_t *uptime)
+	{
+	FILE *fp;
+	char buf[sizeof(long)3 2 + 4]; /* enough for long.long */
+	unsigned long uptime_sec, decimal;
+
+	fp = fopen_for_read(PROCFS_UPTIME);
+	if (!fp)
+	return;
+	if (fgets(buf, sizeof(buf), fp)) {
+	if (sscanf(buf, "%lu.%lu", &uptime_sec, &decimal) == 2) {
+	uptime = (data_t)uptime_sec G.hz + decimal * G.hz / 100;
+	}
+	}
+
+	fclose(fp);
+	}
+
+	static void get_localtime(struct tm *tm)
+	{
+	time_t timer;
+	time(&timer);
+	localtime_r(&timer, tm);
+	}
+
+	static void alarm_handler(int sig UNUSED_PARAM)
+	{
+	signal(SIGALRM, alarm_handler);
+	alarm(G.interval);
+	}
+
+	static void main_loop(void)
+	{
+	unsigned current;
+	unsigned cpus;
+
+	/* Read the stats */
+	if (G.cpu_nr > 1) {
+	G.per_cpu_uptime[0] = 0;
+	get_uptime(&G.per_cpu_uptime[0]);
+	}
+
+	get_cpu_statistics(G.st_cpu[0], &G.global_uptime[0], &G.per_cpu_uptime[0]);
+
+	if (display_opt(D_IRQ_SUM))
+	get_irqs_from_stat(G.st_irq[0]);
+
+	if (display_opt(D_IRQ_SUM \| D_IRQ_CPU))
+	get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
+	G.irqcpu_nr, 0);
+
+	if (display_opt(D_SOFTIRQS))
+	get_irqs_from_interrupts(PROCFS_SOFTIRQS, G.st_softirqcpu,
+	G.softirqcpu_nr, 0);
+
+	if (G.interval == 0) {
+	/* Display since boot time */
+	cpus = G.cpu_nr + 1;
+	G.timestamp[1] = G.timestamp[0];
+	memset(G.st_cpu[1], 0, sizeof(G.st_cpu[1][0]) * cpus);
+	memset(G.st_irq[1], 0, sizeof(G.st_irq[1][0]) * cpus);
+	memset(G.st_irqcpu[1], 0, sizeof(G.st_irqcpu[1][0]) * cpus * G.irqcpu_nr);
+	memset(G.st_softirqcpu[1], 0, sizeof(G.st_softirqcpu[1][0]) * cpus * G.softirqcpu_nr);
+
+	write_stats(0);
+
+	/* And we're done */
+	return;
+	}
+
+	/* Set a handler for SIGALRM */
+	alarm_handler(0);
+
+	/* Save the stats we already have. We need them to compute the average */
+	G.timestamp[2] = G.timestamp[0];
+	G.global_uptime[2] = G.global_uptime[0];
+	G.per_cpu_uptime[2] = G.per_cpu_uptime[0];
+	cpus = G.cpu_nr + 1;
+	memcpy(G.st_cpu[2], G.st_cpu[0], sizeof(G.st_cpu[0][0]) * cpus);
+	memcpy(G.st_irq[2], G.st_irq[0], sizeof(G.st_irq[0][0]) * cpus);
+	memcpy(G.st_irqcpu[2], G.st_irqcpu[0], sizeof(G.st_irqcpu[0][0]) * cpus * G.irqcpu_nr);
+	if (display_opt(D_SOFTIRQS)) {
+	memcpy(G.st_softirqcpu[2], G.st_softirqcpu[0],
+	sizeof(G.st_softirqcpu[0][0]) * cpus * G.softirqcpu_nr);
+	}
+
+	current = 1;
+	while (1) {
+	/* Suspend until a signal is received */
+	pause();
+
+	/* Set structures to 0 to distinguish off/online CPUs */
+	memset(&G.st_cpu[current][/cpu:/ 1], 0, sizeof(G.st_cpu[0][0]) * G.cpu_nr);
+
+	get_localtime(&G.timestamp[current]);
+
+	/* Read stats */
+	if (G.cpu_nr > 1) {
+	G.per_cpu_uptime[current] = 0;
+	get_uptime(&G.per_cpu_uptime[current]);
+	}
+	get_cpu_statistics(G.st_cpu[current], &G.global_uptime[current], &G.per_cpu_uptime[current]);
+
+	if (display_opt(D_IRQ_SUM))
+	get_irqs_from_stat(G.st_irq[current]);
+
+	if (display_opt(D_IRQ_SUM \| D_IRQ_CPU))
+	get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
+	G.irqcpu_nr, current);
+
+	if (display_opt(D_SOFTIRQS))
+	get_irqs_from_interrupts(PROCFS_SOFTIRQS,
+	G.st_softirqcpu,
+	G.softirqcpu_nr, current);
+
+	write_stats(current);
+
+	if (G.count > 0) {
+	if (--G.count == 0)
+	break;
+	}
+
+	current ^= 1;
+	}
+
+	/* Print average statistics */
+	write_stats_avg(current);
+	}
+
+	/* Initialization */
+
+	/* Get number of clock ticks per sec */
+	static ALWAYS_INLINE unsigned get_hz(void)
+	{
+	return sysconf(_SC_CLK_TCK);
+	}
+
+	static void alloc_struct(int cpus)
+	{
+	int i;
+	for (i = 0; i < 3; i++) {
+	G.st_cpu[i] = xzalloc(sizeof(G.st_cpu[i][0]) * cpus);
+	G.st_irq[i] = xzalloc(sizeof(G.st_irq[i][0]) * cpus);
+	G.st_irqcpu[i] = xzalloc(sizeof(G.st_irqcpu[i][0]) * cpus * G.irqcpu_nr);
+	G.st_softirqcpu[i] = xzalloc(sizeof(G.st_softirqcpu[i][0]) * cpus * G.softirqcpu_nr);
+	}
+	G.cpu_bitmap_len = (cpus >> 3) + 1;
+	G.cpu_bitmap = xzalloc(G.cpu_bitmap_len);
+	}
+
+	static void print_header(struct tm *t)
+	{
+	char cur_date[16];
+	struct utsname uts;
+
+	/* Get system name, release number and hostname */
+	uname(&uts);
+
+	strftime(cur_date, sizeof(cur_date), "%x", t);
+
+	printf("%s %s (%s) \t%s \t_%s_\t(%d CPU)\n",
+	uts.sysname, uts.release, uts.nodename, cur_date, uts.machine, G.cpu_nr);
+	}
+
+	/*
+	* Get number of processors in /sys
+	*/
+	static int get_sys_cpu_nr(void)
+	{
+	DIR *dir;
+	struct dirent *d;
+	struct stat buf;
+	char line[MAX_PF_NAME];
+	int proc_nr = 0;
+
+	dir = opendir(SYSFS_DEVCPU);
+	if (!dir)
+	return 0; /* /sys not mounted */
+
+	/* Get current file entry */
+	while ((d = readdir(dir)) != NULL) {
+	if (starts_with_cpu(d->d_name) && isdigit(d->d_name[3])) {
+	snprintf(line, MAX_PF_NAME, "%s/%s", SYSFS_DEVCPU,
+	d->d_name);
+	line[MAX_PF_NAME - 1] = '\0';
+	/* Get information about file */
+	if (stat(line, &buf) < 0)
+	continue;
+	/* If found 'cpuN', we have one more processor */
+	if (S_ISDIR(buf.st_mode))
+	proc_nr++;
+	}
+	}
+
+	closedir(dir);
+	return proc_nr;
+	}
+
+	/*
+	* Get number of processors in /proc/stat
+	* Return value '0' means one CPU and non SMP kernel.
+	* Otherwise N means N processor(s) and SMP kernel.
+	*/
+	static int get_proc_cpu_nr(void)
+	{
+	FILE *fp;
+	char line[256];
+	int proc_nr = -1;
+
+	fp = xfopen_for_read(PROCFS_STAT);
+	while (fgets(line, sizeof(line), fp)) {
+	if (!starts_with_cpu(line)) {
+	if (proc_nr >= 0)
+	break; /* we are past "cpuN..." lines */
+	continue;
+	}
+	if (line[3] != ' ') { /* "cpuN" */
+	int num_proc;
+	if (sscanf(line + 3, "%u", &num_proc) == 1
+	&& num_proc > proc_nr
+	) {
+	proc_nr = num_proc;
+	}
+	}
+	}
+
+	fclose(fp);
+	return proc_nr + 1;
+	}
+
+	static int get_cpu_nr(void)
+	{
+	int n;
+
+	/* Try to use /sys, if possible */
+	n = get_sys_cpu_nr();
+	if (n == 0)
+	/* Otherwise use /proc/stat */
+	n = get_proc_cpu_nr();
+
+	return n;
+	}
+
+	/*
+	* Get number of interrupts available per processor
+	*/
+	static int get_irqcpu_nr(const char *f, int max_irqs)
+	{
+	FILE *fp;
+	char *line;
+	unsigned linelen;
+	unsigned irq;
+
+	fp = fopen_for_read(f);
+	if (!fp) /* No interrupts file */
+	return 0;
+
+	linelen = INTERRUPTS_LINE + 16 * G.cpu_nr;
+	line = xmalloc(linelen);
+
+	irq = 0;
+	while (fgets(line, linelen, fp)
+	&& irq < max_irqs
+	) {
+	int p = strcspn(line, ":");
+	if ((p > 0) && (p < 16))
+	irq++;
+	}
+
+	fclose(fp);
+	free(line);
+
+	return irq;
+	}
+
+	//usage:#define mpstat_trivial_usage
+	//usage: "[-A] [-I SUM\|CPU\|ALL\|SCPU] [-u] [-P num\|ALL] [INTERVAL [COUNT]]"
+	//usage:#define mpstat_full_usage "\n\n"
+	//usage: "Per-processor statistics\n"
+	//usage: "\nOptions:"
+	//usage: "\n -A Same as -I ALL -u -P ALL"
+	//usage: "\n -I SUM\|CPU\|ALL\|SCPU Report interrupt statistics"
+	//usage: "\n -P num\|ALL Processor to monitor"
+	//usage: "\n -u Report CPU utilization"
+
+	int mpstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+	int mpstat_main(int UNUSED_PARAM argc, char **argv)
+	{
+	char *opt_irq_fmt;
+	char *opt_set_cpu;
+	int i, opt;
+	enum {
+	OPT_ALL = 1 << 0, /* -A */
+	OPT_INTS = 1 << 1, /* -I */
+	OPT_SETCPU = 1 << 2, /* -P */
+	OPT_UTIL = 1 << 3, /* -u */
+	};
+
+	/* Dont buffer data if redirected to a pipe */
+	setbuf(stdout, NULL);
+
+	INIT_G();
+
+	G.interval = -1;
+
+	/* Get number of processors */
+	G.cpu_nr = get_cpu_nr();
+
+	/* Get number of clock ticks per sec */
+	G.hz = get_hz();
+
+	/* Calculate number of interrupts per processor */
+	G.irqcpu_nr = get_irqcpu_nr(PROCFS_INTERRUPTS, NR_IRQS) + NR_IRQCPU_PREALLOC;
+
+	/* Calculate number of soft interrupts per processor */
+	G.softirqcpu_nr = get_irqcpu_nr(PROCFS_SOFTIRQS, NR_IRQS) + NR_IRQCPU_PREALLOC;
+
+	/* Allocate space for structures. + 1 for global structure. */
+	alloc_struct(G.cpu_nr + 1);
+
+	/* Parse and process arguments */
+	opt = getopt32(argv, "AI:P:u", &opt_irq_fmt, &opt_set_cpu);
+	argv += optind;
+
+	if (*argv) {
+	/* Get interval */
+	G.interval = xatoi_u(*argv);
+	G.count = -1;
+	argv++;
+	if (*argv) {
+	/* Get count value */
+	if (G.interval == 0)
+	bb_show_usage();
+	G.count = xatoi_u(*argv);
+	//if (*++argv)
+	// bb_show_usage();
+	}
+	}
+	if (G.interval < 0)
+	G.interval = 0;
+
+	if (opt & OPT_ALL) {
+	G.p_option = 1;
+	G.options \|= D_CPU + D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS;
+	/* Select every CPU */
+	memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
+	}
+
+	if (opt & OPT_INTS) {
+	if (strcmp(opt_irq_fmt, "ALL") == 0)
+	G.options \|= D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS;
+	else if (strcmp(opt_irq_fmt, "CPU") == 0)
+	G.options \|= D_IRQ_CPU;
+	else if (strcmp(opt_irq_fmt, "SUM") == 0)
+	G.options \|= D_IRQ_SUM;
+	else if (strcmp(opt_irq_fmt, "SCPU") == 0)
+	G.options \|= D_SOFTIRQS;
+	else
+	bb_show_usage();
+	}
+
+	if ((opt & OPT_UTIL) /* -u? */
+	\|\| G.options == 0 /* nothing? (use default then) */
+	) {
+	G.options \|= D_CPU;
+	}
+
+	if (opt & OPT_SETCPU) {
+	char *t;
+	G.p_option = 1;
+
+	for (t = strtok(opt_set_cpu, ","); t; t = strtok(NULL, ",")) {
+	if (strcmp(t, "ALL") == 0) {
+	/* Select every CPU */
+	memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
+	} else {
+	/* Get CPU number */
+	unsigned n = xatoi_u(t);
+	if (n >= G.cpu_nr)
+	bb_error_msg_and_die("not that many processors");
+	n++;
+	G.cpu_bitmap[n >> 3] \|= 1 << (n & 7);
+	}
+	}
+	}
+
+	if (!G.p_option)
+	/* Display global stats */
+	G.cpu_bitmap[0] = 1;
+
+	/* Get time */
+	get_localtime(&G.timestamp[0]);
+
+	/* Display header */
+	print_header(&G.timestamp[0]);
+
+	/* The main loop */
+	main_loop();
+
+	if (ENABLE_FEATURE_CLEAN_UP) {
+	/* Clean up */
+	for (i = 0; i < 3; i++) {
+	free(G.st_cpu[i]);
+	free(G.st_irq[i]);
+	free(G.st_irqcpu[i]);
+	free(G.st_softirqcpu[i]);
+	}
+	free(G.cpu_bitmap);
+	free(&G);
+	}
+
+	return EXIT_SUCCESS;
+	}