1 /* vi: set sw=4 ts=4: */
3 * Per-processor statistics, based on sysstat version 9.1.2 by Sebastien Godard
5 * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
10 //config: bool "mpstat (10 kb)"
13 //config: Per-processor statistics
15 //applet:IF_MPSTAT(APPLET(mpstat, BB_DIR_BIN, BB_SUID_DROP))
16 /* shouldn't be noexec: "mpstat INTERVAL" runs indefinitely */
18 //kbuild:lib-$(CONFIG_MPSTAT) += mpstat.o
21 #include <sys/utsname.h> /* struct utsname */
23 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
24 #define debug(fmt, ...) ((void)0)
26 /* Size of /proc/interrupts line, CPU data excluded */
27 #define INTERRUPTS_LINE 64
28 /* Maximum number of interrupts */
30 #define NR_IRQCPU_PREALLOC 3
31 #define MAX_IRQNAME_LEN 16
32 #define MAX_PF_NAME 512
33 /* sysstat 9.0.6 uses width 8, but newer code which also prints /proc/softirqs
34 * data needs more: "interrupts" in /proc/softirqs have longer names,
35 * most are up to 8 chars, one (BLOCK_IOPOLL) is even longer.
36 * We are printing headers in the " IRQNAME/s" form, experimentally
37 * anything smaller than 10 chars looks ugly for /proc/softirqs stats.
39 #define INTRATE_SCRWIDTH 10
40 #define INTRATE_SCRWIDTH_STR "10"
43 #define PROCFS_STAT "/proc/stat"
44 #define PROCFS_INTERRUPTS "/proc/interrupts"
45 #define PROCFS_SOFTIRQS "/proc/softirqs"
46 #define PROCFS_UPTIME "/proc/uptime"
50 typedef unsigned long long data_t;
51 typedef long long idata_t;
53 #define DATA_MAX ULLONG_MAX
55 typedef unsigned long data_t;
58 #define DATA_MAX ULONG_MAX
64 char irq_name[MAX_IRQNAME_LEN];
84 /* Globals. Sort by size and access frequency. */
88 unsigned cpu_nr; /* Number of CPUs */
89 unsigned irqcpu_nr; /* Number of interrupts per CPU */
90 unsigned softirqcpu_nr; /* Number of soft interrupts per CPU */
93 unsigned cpu_bitmap_len;
95 // 9.0.6 does not do it. Try "mpstat -A 1 2" - headers are repeated!
96 //smallint header_done;
97 //smallint avg_header_done;
98 unsigned char *cpu_bitmap; /* Bit 0: global, bit 1: 1st proc... */
99 data_t global_uptime[3];
100 data_t per_cpu_uptime[3];
101 struct stats_cpu *st_cpu[3];
102 struct stats_irq *st_irq[3];
103 struct stats_irqcpu *st_irqcpu[3];
104 struct stats_irqcpu *st_softirqcpu[3];
105 struct tm timestamp[3];
107 #define G (*ptr_to_globals)
108 #define INIT_G() do { \
109 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
112 /* The selected interrupts statistics (bits in G.options) */
122 static ALWAYS_INLINE int display_opt(int opt)
124 return (opt & G.options);
127 #if DATA_MAX > 0xffffffff
129 * Handle overflow conditions properly for counters which can have
130 * less bits than data_t, depending on the kernel version.
132 /* Surprisingly, on 32bit inlining is a size win */
133 static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
135 data_t v = curr - prev;
137 if ((idata_t)v < 0 /* curr < prev - counter overflow? */
138 && prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
140 /* Add 33th bit set to 1 to curr, compensating for the overflow */
141 /* double shift defeats "warning: left shift count >= width of type" */
142 v += ((data_t)1 << 16) << 16;
147 static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
153 static double percent_value(data_t prev, data_t curr, data_t itv)
155 return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
158 static double hz_value(data_t prev, data_t curr, data_t itv)
160 //bb_error_msg("curr:%lld prev:%lld G.hz:%u", curr, prev, G.hz);
161 return ((double)overflow_safe_sub(prev, curr)) / itv * G.hz;
164 static ALWAYS_INLINE data_t jiffies_diff(data_t old, data_t new)
166 data_t diff = new - old;
167 return (diff == 0) ? 1 : diff;
170 static int is_cpu_in_bitmap(unsigned cpu)
172 return G.cpu_bitmap[cpu >> 3] & (1 << (cpu & 7));
175 static void write_irqcpu_stats(struct stats_irqcpu *per_cpu_stats[],
178 int prev, int current,
179 const char *prev_str, const char *current_str)
183 struct stats_irqcpu *p0, *q0;
185 /* Check if number of IRQs has changed */
186 if (G.interval != 0) {
187 for (j = 0; j <= total_irqs; j++) {
188 p0 = &per_cpu_stats[current][j];
189 if (p0->irq_name[0] != '\0') {
190 q0 = &per_cpu_stats[prev][j];
191 if (strcmp(p0->irq_name, q0->irq_name) != 0) {
192 /* Strings are different */
200 printf("\n%-11s CPU", prev_str);
202 /* A bit complex code to "buy back" space if one header is too wide.
203 * Here's how it looks like. BLOCK_IOPOLL eats too much space,
204 * and latter headers use smaller width to compensate:
205 * ...BLOCK/s BLOCK_IOPOLL/s TASKLET/s SCHED/s HRTIMER/s RCU/s
206 * ... 2.32 0.00 0.01 17.58 0.14 141.96
208 int expected_len = 0;
210 for (j = 0; j < total_irqs; j++) {
211 p0 = &per_cpu_stats[current][j];
212 if (p0->irq_name[0] != '\0') {
213 int n = (INTRATE_SCRWIDTH-3) - (printed_len - expected_len);
214 printed_len += printf(" %*s/s", n > 0 ? n : 0, skip_whitespace(p0->irq_name));
215 expected_len += INTRATE_SCRWIDTH;
221 for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
222 /* Check if we want stats about this CPU */
223 if (!is_cpu_in_bitmap(cpu) && G.p_option) {
227 printf("%-11s %4u", current_str, cpu - 1);
229 for (j = 0; j < total_irqs; j++) {
230 /* IRQ field set only for proc 0 */
231 p0 = &per_cpu_stats[current][j];
234 * An empty string for irq name means that
235 * interrupt is no longer used.
237 if (p0->irq_name[0] != '\0') {
239 q0 = &per_cpu_stats[prev][offset];
242 * If we want stats for the time since boot
243 * we have p0->irq != q0->irq.
245 if (strcmp(p0->irq_name, q0->irq_name) != 0
250 q0 = &per_cpu_stats[prev][offset];
252 if (strcmp(p0->irq_name, q0->irq_name) != 0
253 && (j + 1 < total_irqs)
256 q0 = &per_cpu_stats[prev][offset];
260 if (strcmp(p0->irq_name, q0->irq_name) == 0
263 struct stats_irqcpu *p, *q;
264 p = &per_cpu_stats[current][(cpu - 1) * total_irqs + j];
265 q = &per_cpu_stats[prev][(cpu - 1) * total_irqs + offset];
266 printf("%"INTRATE_SCRWIDTH_STR".2f",
267 (double)(p->interrupts - q->interrupts) / itv * G.hz);
277 static data_t get_per_cpu_interval(const struct stats_cpu *scc,
278 const struct stats_cpu *scp)
280 return ((scc->cpu_user + scc->cpu_nice +
281 scc->cpu_system + scc->cpu_iowait +
282 scc->cpu_idle + scc->cpu_steal +
283 scc->cpu_irq + scc->cpu_softirq) -
284 (scp->cpu_user + scp->cpu_nice +
285 scp->cpu_system + scp->cpu_iowait +
286 scp->cpu_idle + scp->cpu_steal +
287 scp->cpu_irq + scp->cpu_softirq));
290 static void print_stats_cpu_struct(const struct stats_cpu *p,
291 const struct stats_cpu *c,
294 printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
295 percent_value(p->cpu_user - p->cpu_guest,
296 /**/ c->cpu_user - c->cpu_guest, itv),
297 percent_value(p->cpu_nice , c->cpu_nice , itv),
298 percent_value(p->cpu_system , c->cpu_system , itv),
299 percent_value(p->cpu_iowait , c->cpu_iowait , itv),
300 percent_value(p->cpu_irq , c->cpu_irq , itv),
301 percent_value(p->cpu_softirq, c->cpu_softirq, itv),
302 percent_value(p->cpu_steal , c->cpu_steal , itv),
303 percent_value(p->cpu_guest , c->cpu_guest , itv),
304 percent_value(p->cpu_idle , c->cpu_idle , itv)
308 static void write_stats_core(int prev, int current,
309 const char *prev_str, const char *current_str)
311 struct stats_cpu *scc, *scp;
312 data_t itv, global_itv;
315 /* Compute time interval */
316 itv = global_itv = jiffies_diff(G.global_uptime[prev], G.global_uptime[current]);
318 /* Reduce interval to one CPU */
320 itv = jiffies_diff(G.per_cpu_uptime[prev], G.per_cpu_uptime[current]);
322 /* Print CPU stats */
323 if (display_opt(D_CPU)) {
325 ///* This is done exactly once */
326 //if (!G.header_done) {
327 printf("\n%-11s CPU %%usr %%nice %%sys %%iowait %%irq %%soft %%steal %%guest %%idle\n",
330 // G.header_done = 1;
333 for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
336 /* Print stats about this particular CPU? */
337 if (!is_cpu_in_bitmap(cpu))
340 scc = &G.st_cpu[current][cpu];
341 scp = &G.st_cpu[prev][cpu];
342 per_cpu_itv = global_itv;
344 printf((cpu ? "%-11s %4u" : "%-11s all"), current_str, cpu - 1);
348 * If the CPU is offline, then it isn't in /proc/stat,
349 * so all values are 0.
350 * NB: Guest time is already included in user time.
352 if ((scc->cpu_user | scc->cpu_nice | scc->cpu_system |
353 scc->cpu_iowait | scc->cpu_idle | scc->cpu_steal |
354 scc->cpu_irq | scc->cpu_softirq) == 0
357 * Set current struct fields to values from prev.
358 * iteration. Then their values won't jump from
359 * zero, when the CPU comes back online.
365 /* Compute interval again for current proc */
366 per_cpu_itv = get_per_cpu_interval(scc, scp);
367 if (per_cpu_itv == 0) {
369 * If the CPU is tickless then there is no change in CPU values
370 * but the sum of values is not zero.
374 printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
375 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, idle);
379 print_stats_cpu_struct(scp, scc, per_cpu_itv);
383 /* Print total number of IRQs per CPU */
384 if (display_opt(D_IRQ_SUM)) {
386 ///* Print average header, this is done exactly once */
387 //if (!G.avg_header_done) {
388 printf("\n%-11s CPU intr/s\n", prev_str);
389 // G.avg_header_done = 1;
392 for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
395 /* Print stats about this CPU? */
396 if (!is_cpu_in_bitmap(cpu))
400 printf((cpu ? "%-11s %4u" : "%-11s all"), current_str, cpu - 1);
402 scc = &G.st_cpu[current][cpu];
403 scp = &G.st_cpu[prev][cpu];
404 /* Compute interval again for current proc */
405 per_cpu_itv = get_per_cpu_interval(scc, scp);
406 if (per_cpu_itv == 0) {
407 printf(" %9.2f\n", 0.0);
411 //bb_error_msg("G.st_irq[%u][%u].irq_nr:%lld - G.st_irq[%u][%u].irq_nr:%lld",
412 // current, cpu, G.st_irq[prev][cpu].irq_nr, prev, cpu, G.st_irq[current][cpu].irq_nr);
413 printf(" %9.2f\n", hz_value(G.st_irq[prev][cpu].irq_nr, G.st_irq[current][cpu].irq_nr, per_cpu_itv));
417 if (display_opt(D_IRQ_CPU)) {
418 write_irqcpu_stats(G.st_irqcpu, G.irqcpu_nr,
421 prev_str, current_str
425 if (display_opt(D_SOFTIRQS)) {
426 write_irqcpu_stats(G.st_softirqcpu, G.softirqcpu_nr,
429 prev_str, current_str
435 * Print the statistics
437 static void write_stats(int current)
442 strftime(prev_time, sizeof(prev_time), "%X", &G.timestamp[!current]);
443 strftime(curr_time, sizeof(curr_time), "%X", &G.timestamp[current]);
445 write_stats_core(!current, current, prev_time, curr_time);
448 static void write_stats_avg(int current)
450 write_stats_core(2, current, "Average:", "Average:");
454 * Read CPU statistics
456 static void get_cpu_statistics(struct stats_cpu *cpu, data_t *up, data_t *up0)
461 fp = xfopen_for_read(PROCFS_STAT);
463 while (fgets(buf, sizeof(buf), fp)) {
466 struct stats_cpu *cp;
468 if (!starts_with_cpu(buf))
469 continue; /* not "cpu" */
471 cp = cpu; /* for "cpu " case */
475 || sscanf(buf + 3, "%u ", &cpu_number) != 1
476 || cpu_number >= G.cpu_nr
480 cp = &cpu[cpu_number + 1];
483 /* Read the counters, save them */
484 /* Not all fields have to be present */
485 memset(cp, 0, sizeof(*cp));
487 " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
488 " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
489 " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u",
490 &cp->cpu_user, &cp->cpu_nice, &cp->cpu_system,
491 &cp->cpu_idle, &cp->cpu_iowait, &cp->cpu_irq,
492 &cp->cpu_softirq, &cp->cpu_steal, &cp->cpu_guest
495 * Compute uptime in jiffies (1/HZ), it'll be the sum of
496 * individual CPU's uptimes.
497 * NB: We have to omit cpu_guest, because cpu_user includes it.
499 sum = cp->cpu_user + cp->cpu_nice + cp->cpu_system +
500 cp->cpu_idle + cp->cpu_iowait + cp->cpu_irq +
501 cp->cpu_softirq + cp->cpu_steal;
508 if (cpu_number == 0 && *up0 != 0) {
509 /* Compute uptime of single CPU */
518 * Read IRQs from /proc/stat
520 static void get_irqs_from_stat(struct stats_irq *irq)
525 fp = xfopen_for_read(PROCFS_STAT);
527 while (fgets(buf, sizeof(buf), fp)) {
528 //bb_error_msg("/proc/stat:'%s'", buf);
529 if (is_prefixed_with(buf, "intr ")) {
530 /* Read total number of IRQs since system boot */
531 sscanf(buf + 5, "%"FMT_DATA"u", &irq->irq_nr);
539 * Read stats from /proc/interrupts or /proc/softirqs
541 static void get_irqs_from_interrupts(const char *fname,
542 struct stats_irqcpu *per_cpu_stats[],
543 int irqs_per_cpu, int current)
546 struct stats_irq *irq_i;
547 struct stats_irqcpu *ic;
552 int cpu_index[G.cpu_nr];
556 // Otherwise reading of /proc/softirqs
557 // was resetting counts to 0 after we painstakingly collected them from
558 // /proc/interrupts. Which resulted in:
559 // 01:32:47 PM CPU intr/s
560 // 01:32:47 PM all 591.47
561 // 01:32:47 PM 0 0.00 <= ???
562 // 01:32:47 PM 1 0.00 <= ???
563 // for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
564 // G.st_irq[current][cpu].irq_nr = 0;
565 // //bb_error_msg("G.st_irq[%u][%u].irq_nr=0", current, cpu);
568 fp = fopen_for_read(fname);
572 buflen = INTERRUPTS_LINE + 16 * G.cpu_nr;
573 buf = xmalloc(buflen);
575 /* Parse header and determine, which CPUs are online */
577 while (fgets(buf, buflen, fp)) {
580 while ((cp = strstr(next, "CPU")) != NULL
583 cpu = strtoul(cp + 3, &next, 10);
584 cpu_index[iindex++] = cpu;
586 if (iindex) /* We found header */
591 while (fgets(buf, buflen, fp)
592 && irq < irqs_per_cpu
598 /* Skip over "IRQNAME:" */
599 cp = strchr(buf, ':');
604 ic = &per_cpu_stats[current][irq];
606 if (len >= sizeof(ic->irq_name)) {
607 len = sizeof(ic->irq_name) - 1;
609 safe_strncpy(ic->irq_name, buf, len + 1);
610 //bb_error_msg("%s: irq%d:'%s' buf:'%s'", fname, irq, ic->irq_name, buf);
613 for (cpu = 0; cpu < iindex; cpu++) {
615 ic = &per_cpu_stats[current][cpu_index[cpu] * irqs_per_cpu + irq];
616 irq_i = &G.st_irq[current][cpu_index[cpu] + 1];
617 ic->interrupts = strtoul(cp, &next, 10);
618 /* Count only numerical IRQs */
619 if (isdigit(last_char)) {
620 irq_i->irq_nr += ic->interrupts;
621 //bb_error_msg("G.st_irq[%u][%u].irq_nr + %u = %lld",
622 // current, cpu_index[cpu] + 1, ic->interrupts, irq_i->irq_nr);
631 while (irq < irqs_per_cpu) {
632 /* Number of interrupts per CPU has changed */
633 ic = &per_cpu_stats[current][irq];
634 ic->irq_name[0] = '\0'; /* False interrupt */
639 static void get_uptime(data_t *uptime)
642 char buf[sizeof(long)*3 * 2 + 4]; /* enough for long.long */
643 unsigned long uptime_sec, decimal;
645 fp = xfopen_for_read(PROCFS_UPTIME);
646 if (fgets(buf, sizeof(buf), fp)) {
647 if (sscanf(buf, "%lu.%lu", &uptime_sec, &decimal) == 2) {
648 *uptime = (data_t)uptime_sec * G.hz + decimal * G.hz / 100;
655 static void get_localtime(struct tm *tm)
659 localtime_r(&timer, tm);
662 static void alarm_handler(int sig UNUSED_PARAM)
664 signal(SIGALRM, alarm_handler);
668 static void main_loop(void)
675 G.per_cpu_uptime[0] = 0;
676 get_uptime(&G.per_cpu_uptime[0]);
679 get_cpu_statistics(G.st_cpu[0], &G.global_uptime[0], &G.per_cpu_uptime[0]);
681 if (display_opt(D_IRQ_SUM))
682 get_irqs_from_stat(G.st_irq[0]);
684 if (display_opt(D_IRQ_SUM | D_IRQ_CPU))
685 get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
688 if (display_opt(D_SOFTIRQS))
689 get_irqs_from_interrupts(PROCFS_SOFTIRQS, G.st_softirqcpu,
692 if (G.interval == 0) {
693 /* Display since boot time */
695 G.timestamp[1] = G.timestamp[0];
696 memset(G.st_cpu[1], 0, sizeof(G.st_cpu[1][0]) * cpus);
697 memset(G.st_irq[1], 0, sizeof(G.st_irq[1][0]) * cpus);
698 memset(G.st_irqcpu[1], 0, sizeof(G.st_irqcpu[1][0]) * cpus * G.irqcpu_nr);
699 memset(G.st_softirqcpu[1], 0, sizeof(G.st_softirqcpu[1][0]) * cpus * G.softirqcpu_nr);
707 /* Set a handler for SIGALRM */
710 /* Save the stats we already have. We need them to compute the average */
711 G.timestamp[2] = G.timestamp[0];
712 G.global_uptime[2] = G.global_uptime[0];
713 G.per_cpu_uptime[2] = G.per_cpu_uptime[0];
715 memcpy(G.st_cpu[2], G.st_cpu[0], sizeof(G.st_cpu[0][0]) * cpus);
716 memcpy(G.st_irq[2], G.st_irq[0], sizeof(G.st_irq[0][0]) * cpus);
717 memcpy(G.st_irqcpu[2], G.st_irqcpu[0], sizeof(G.st_irqcpu[0][0]) * cpus * G.irqcpu_nr);
718 if (display_opt(D_SOFTIRQS)) {
719 memcpy(G.st_softirqcpu[2], G.st_softirqcpu[0],
720 sizeof(G.st_softirqcpu[0][0]) * cpus * G.softirqcpu_nr);
725 /* Suspend until a signal is received */
728 /* Set structures to 0 to distinguish off/online CPUs */
729 memset(&G.st_cpu[current][/*cpu:*/ 1], 0, sizeof(G.st_cpu[0][0]) * G.cpu_nr);
731 get_localtime(&G.timestamp[current]);
735 G.per_cpu_uptime[current] = 0;
736 get_uptime(&G.per_cpu_uptime[current]);
738 get_cpu_statistics(G.st_cpu[current], &G.global_uptime[current], &G.per_cpu_uptime[current]);
740 if (display_opt(D_IRQ_SUM))
741 get_irqs_from_stat(G.st_irq[current]);
743 if (display_opt(D_IRQ_SUM | D_IRQ_CPU)) {
745 for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
746 G.st_irq[current][cpu].irq_nr = 0;
748 /* accumulates .irq_nr */
749 get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
750 G.irqcpu_nr, current);
753 if (display_opt(D_SOFTIRQS))
754 get_irqs_from_interrupts(PROCFS_SOFTIRQS,
756 G.softirqcpu_nr, current);
758 write_stats(current);
768 /* Print average statistics */
769 write_stats_avg(current);
774 static void alloc_struct(int cpus)
777 for (i = 0; i < 3; i++) {
778 G.st_cpu[i] = xzalloc(sizeof(G.st_cpu[i][0]) * cpus);
779 G.st_irq[i] = xzalloc(sizeof(G.st_irq[i][0]) * cpus);
780 G.st_irqcpu[i] = xzalloc(sizeof(G.st_irqcpu[i][0]) * cpus * G.irqcpu_nr);
781 G.st_softirqcpu[i] = xzalloc(sizeof(G.st_softirqcpu[i][0]) * cpus * G.softirqcpu_nr);
783 G.cpu_bitmap_len = (cpus >> 3) + 1;
784 G.cpu_bitmap = xzalloc(G.cpu_bitmap_len);
787 static void print_header(struct tm *t)
792 /* Get system name, release number and hostname */
795 strftime(cur_date, sizeof(cur_date), "%x", t);
797 printf("%s %s (%s)\t%s\t_%s_\t(%u CPU)\n",
798 uts.sysname, uts.release, uts.nodename, cur_date, uts.machine, G.cpu_nr);
802 * Get number of interrupts available per processor
804 static int get_irqcpu_nr(const char *f, int max_irqs)
811 fp = fopen_for_read(f);
812 if (!fp) /* No interrupts file */
815 linelen = INTERRUPTS_LINE + 16 * G.cpu_nr;
816 line = xmalloc(linelen);
819 while (fgets(line, linelen, fp)
822 int p = strcspn(line, ":");
823 if ((p > 0) && (p < 16))
833 //usage:#define mpstat_trivial_usage
834 //usage: "[-A] [-I SUM|CPU|ALL|SCPU] [-u] [-P num|ALL] [INTERVAL [COUNT]]"
835 //usage:#define mpstat_full_usage "\n\n"
836 //usage: "Per-processor statistics\n"
837 //usage: "\n -A Same as -I ALL -u -P ALL"
838 //usage: "\n -I SUM|CPU|ALL|SCPU Report interrupt statistics"
839 //usage: "\n -P num|ALL Processor to monitor"
840 //usage: "\n -u Report CPU utilization"
842 int mpstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
843 int mpstat_main(int UNUSED_PARAM argc, char **argv)
849 OPT_ALL = 1 << 0, /* -A */
850 OPT_INTS = 1 << 1, /* -I */
851 OPT_SETCPU = 1 << 2, /* -P */
852 OPT_UTIL = 1 << 3, /* -u */
855 /* Dont buffer data if redirected to a pipe */
856 setbuf(stdout, NULL);
862 /* Get number of processors */
863 G.cpu_nr = get_cpu_count();
865 /* Get number of clock ticks per sec */
868 /* Calculate number of interrupts per processor */
869 G.irqcpu_nr = get_irqcpu_nr(PROCFS_INTERRUPTS, NR_IRQS) + NR_IRQCPU_PREALLOC;
871 /* Calculate number of soft interrupts per processor */
872 G.softirqcpu_nr = get_irqcpu_nr(PROCFS_SOFTIRQS, NR_IRQS) + NR_IRQCPU_PREALLOC;
874 /* Allocate space for structures. + 1 for global structure. */
875 alloc_struct(G.cpu_nr + 1);
877 /* Parse and process arguments */
878 opt = getopt32(argv, "AI:P:u", &opt_irq_fmt, &opt_set_cpu);
883 G.interval = xatoi_positive(*argv);
887 /* Get count value */
890 G.count = xatoi_positive(*argv);
900 G.options |= D_CPU + D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS;
901 /* Select every CPU */
902 memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
905 if (opt & OPT_INTS) {
906 static const char v[] = {
907 D_IRQ_CPU, D_IRQ_SUM, D_SOFTIRQS,
908 D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS
910 i = index_in_strings("CPU\0SUM\0SCPU\0ALL\0", opt_irq_fmt);
916 if ((opt & OPT_UTIL) /* -u? */
917 || G.options == 0 /* nothing? (use default then) */
922 if (opt & OPT_SETCPU) {
926 for (t = strtok(opt_set_cpu, ","); t; t = strtok(NULL, ",")) {
927 if (strcmp(t, "ALL") == 0) {
928 /* Select every CPU */
929 memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
932 unsigned n = xatoi_positive(t);
934 bb_error_msg_and_die("not that many processors");
936 G.cpu_bitmap[n >> 3] |= 1 << (n & 7);
942 /* Display global stats */
946 get_localtime(&G.timestamp[0]);
949 print_header(&G.timestamp[0]);
954 if (ENABLE_FEATURE_CLEAN_UP) {
956 for (i = 0; i < 3; i++) {
959 free(G.st_irqcpu[i]);
960 free(G.st_softirqcpu[i]);