procps/mpstat.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Per-processor statistics, based on sysstat version 9.1.2 by Sebastien Godard
   4  *
   5  * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
   6  *
   7  * Licensed under GPLv2, see file LICENSE in this tarball for details.
   8  */
   9
  10 //applet:IF_MPSTAT(APPLET(mpstat, _BB_DIR_BIN, _BB_SUID_DROP))
  11
  12 //kbuild:lib-$(CONFIG_MPSTAT) += mpstat.o
  13
  14 //config:config MPSTAT
  15 //config:       bool "mpstat"
  16 //config:       default y
  17 //config:       help
  18 //config:         Per-processor statistics
  19
  20 #include "libbb.h"
  21 #include <sys/utsname.h>        /* struct utsname */
  22
  23 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
  24 #define debug(fmt, ...) ((void)0)
  25
  26 /* Size of /proc/interrupts line, CPU data excluded */
  27 #define INTERRUPTS_LINE    64
  28 /* Maximum number of interrupts */
  29 #define NR_IRQS            256
  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.
  38  */
  39 #define INTRATE_SCRWIDTH   10
  40 #define INTRATE_SCRWIDTH_STR "10"
  41
  42 /* System files */
  43 #define SYSFS_DEVCPU      "/sys/devices/system/cpu"
  44 #define PROCFS_STAT       "/proc/stat"
  45 #define PROCFS_INTERRUPTS "/proc/interrupts"
  46 #define PROCFS_SOFTIRQS   "/proc/softirqs"
  47 #define PROCFS_UPTIME     "/proc/uptime"
  48
  49
  50 #if 1
  51 typedef unsigned long long data_t;
  52 typedef long long idata_t;
  53 #define FMT_DATA "ll"
  54 #define DATA_MAX ULLONG_MAX
  55 #else
  56 typedef unsigned long data_t;
  57 typedef long idata_t;
  58 #define FMT_DATA "l"
  59 #define DATA_MAX ULONG_MAX
  60 #endif
  61
  62
  63 struct stats_irqcpu {
  64         unsigned interrupt;
  65         char irq_name[MAX_IRQNAME_LEN];
  66 };
  67
  68 struct stats_cpu {
  69         data_t cpu_user;
  70         data_t cpu_nice;
  71         data_t cpu_system;
  72         data_t cpu_idle;
  73         data_t cpu_iowait;
  74         data_t cpu_steal;
  75         data_t cpu_irq;
  76         data_t cpu_softirq;
  77         data_t cpu_guest;
  78 };
  79
  80 struct stats_irq {
  81         data_t irq_nr;
  82 };
  83
  84
  85 /* Globals. Sort by size and access frequency. */
  86 struct globals {
  87         int interval;
  88         int count;
  89         unsigned cpu_nr;                /* Number of CPUs */
  90         unsigned irqcpu_nr;             /* Number of interrupts per CPU */
  91         unsigned softirqcpu_nr;         /* Number of soft interrupts per CPU */
  92         unsigned options;
  93         unsigned hz;
  94         unsigned cpu_bitmap_len;
  95         smallint p_option;
  96         // 9.0.6 does not do it. Try "mpstat -A 1 2" - headers are repeated!
  97         //smallint header_done;
  98         //smallint avg_header_done;
  99         unsigned char *cpu_bitmap;      /* Bit 0: global, bit 1: 1st proc... */
 100         data_t global_uptime[3];
 101         data_t per_cpu_uptime[3];
 102         struct stats_cpu *st_cpu[3];
 103         struct stats_irq *st_irq[3];
 104         struct stats_irqcpu *st_irqcpu[3];
 105         struct stats_irqcpu *st_softirqcpu[3];
 106         struct tm timestamp[3];
 107 };
 108 #define G (*ptr_to_globals)
 109 #define INIT_G() do { \
 110         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 111 } while (0)
 112
 113 /* The selected interrupts statistics (bits in G.options) */
 114 enum {
 115         D_CPU      = 1 << 0,
 116         D_IRQ_SUM  = 1 << 1,
 117         D_IRQ_CPU  = 1 << 2,
 118         D_SOFTIRQS = 1 << 3,
 119 };
 120
 121
 122 /* Is option on? */
 123 static ALWAYS_INLINE int display_opt(int opt)
 124 {
 125         return (opt & G.options);
 126 }
 127
 128 #if DATA_MAX > 0xffffffff
 129 /*
 130  * Handle overflow conditions properly for counters which can have
 131  * less bits than data_t, depending on the kernel version.
 132  */
 133 /* Surprisingly, on 32bit inlining is a size win */
 134 static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
 135 {
 136         data_t v = curr - prev;
 137
 138         if ((idata_t)v < 0     /* curr < prev - counter overflow? */
 139          && prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
 140         ) {
 141                 /* Add 33th bit set to 1 to curr, compensating for the overflow */
 142                 /* double shift defeats "warning: left shift count >= width of type" */
 143                 v += ((data_t)1 << 16) << 16;
 144         }
 145         return v;
 146 }
 147 #else
 148 static ALWAYS_INLINE data_t overflow_safe_sub(data_t prev, data_t curr)
 149 {
 150         return curr - prev;
 151 }
 152 #endif
 153
 154 static double percent_value(data_t prev, data_t curr, data_t itv)
 155 {
 156         return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
 157 }
 158
 159 static double hz_value(data_t prev, data_t curr, data_t itv)
 160 {
 161         //bb_error_msg("curr:%lld prev:%lld G.hz:%u", curr, prev, G.hz);
 162         return ((double)overflow_safe_sub(prev, curr)) / itv * G.hz;
 163 }
 164
 165 static ALWAYS_INLINE data_t jiffies_diff(data_t old, data_t new)
 166 {
 167         data_t diff = new - old;
 168         return (diff == 0) ? 1 : diff;
 169 }
 170
 171 static int is_cpu_in_bitmap(unsigned cpu)
 172 {
 173         return G.cpu_bitmap[cpu >> 3] & (1 << (cpu & 7));
 174 }
 175
 176 static void write_irqcpu_stats(struct stats_irqcpu *per_cpu_stats[],
 177                 int total_irqs,
 178                 data_t itv,
 179                 int prev, int current,
 180                 const char *prev_str, const char *current_str)
 181 {
 182         int j;
 183         int offset, cpu;
 184         struct stats_irqcpu *p0, *q0;
 185
 186         /* Check if number of IRQs has changed */
 187         if (G.interval != 0) {
 188                 for (j = 0; j <= total_irqs; j++) {
 189                         p0 = &per_cpu_stats[current][j];
 190                         if (p0->irq_name[0] != '\0') {
 191                                 q0 = &per_cpu_stats[prev][j];
 192                                 if (strcmp(p0->irq_name, q0->irq_name) != 0) {
 193                                         /* Strings are different */
 194                                         break;
 195                                 }
 196                         }
 197                 }
 198         }
 199
 200         /* Print header */
 201         printf("\n%-11s  CPU", prev_str);
 202         {
 203                 /* A bit complex code to "buy back" space if one header is too wide.
 204                  * Here's how it looks like. BLOCK_IOPOLL eats too much space,
 205                  * and latter headers use smaller width to compensate:
 206                  * ...BLOCK/s BLOCK_IOPOLL/s TASKLET/s SCHED/s HRTIMER/s  RCU/s
 207                  * ...   2.32      0.00      0.01     17.58      0.14    141.96
 208                  */
 209                 int expected_len = 0;
 210                 int printed_len = 0;
 211                 for (j = 0; j < total_irqs; j++) {
 212                         p0 = &per_cpu_stats[current][j];
 213                         if (p0->irq_name[0] != '\0') {
 214                                 int n = (INTRATE_SCRWIDTH-3) - (printed_len - expected_len);
 215                                 printed_len += printf(" %*s/s", n > 0 ? n : 0, skip_whitespace(p0->irq_name));
 216                                 expected_len += INTRATE_SCRWIDTH;
 217                         }
 218                 }
 219         }
 220         bb_putchar('\n');
 221
 222         for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
 223                 /* Check if we want stats about this CPU */
 224                 if (!is_cpu_in_bitmap(cpu) && G.p_option) {
 225                         continue;
 226                 }
 227
 228                 printf("%-11s %4u", current_str, cpu - 1);
 229
 230                 for (j = 0; j < total_irqs; j++) {
 231                         /* IRQ field set only for proc 0 */
 232                         p0 = &per_cpu_stats[current][j];
 233
 234                         /*
 235                          * An empty string for irq name means that
 236                          * interrupt is no longer used.
 237                          */
 238                         if (p0->irq_name[0] != '\0') {
 239                                 offset = j;
 240                                 q0 = &per_cpu_stats[prev][offset];
 241
 242                                 /*
 243                                  * If we want stats for the time since boot
 244                                  * we have p0->irq != q0->irq.
 245                                  */
 246                                 if (strcmp(p0->irq_name, q0->irq_name) != 0
 247                                  && G.interval != 0
 248                                 ) {
 249                                         if (j) {
 250                                                 offset = j - 1;
 251                                                 q0 = &per_cpu_stats[prev][offset];
 252                                         }
 253                                         if (strcmp(p0->irq_name, q0->irq_name) != 0
 254                                          && (j + 1 < total_irqs)
 255                                         ) {
 256                                                 offset = j + 1;
 257                                                 q0 = &per_cpu_stats[prev][offset];
 258                                         }
 259                                 }
 260
 261                                 if (strcmp(p0->irq_name, q0->irq_name) == 0
 262                                  || G.interval == 0
 263                                 ) {
 264                                         struct stats_irqcpu *p, *q;
 265                                         p = &per_cpu_stats[current][(cpu - 1) * total_irqs + j];
 266                                         q = &per_cpu_stats[prev][(cpu - 1) * total_irqs + offset];
 267                                         printf("%"INTRATE_SCRWIDTH_STR".2f",
 268                                                 (double)(p->interrupt - q->interrupt) / itv * G.hz);
 269                                 } else {
 270                                         printf("        N/A");
 271                                 }
 272                         }
 273                 }
 274                 bb_putchar('\n');
 275         }
 276 }
 277
 278 static data_t get_per_cpu_interval(const struct stats_cpu *scc,
 279                 const struct stats_cpu *scp)
 280 {
 281         return ((scc->cpu_user + scc->cpu_nice +
 282                  scc->cpu_system + scc->cpu_iowait +
 283                  scc->cpu_idle + scc->cpu_steal +
 284                  scc->cpu_irq + scc->cpu_softirq) -
 285                 (scp->cpu_user + scp->cpu_nice +
 286                  scp->cpu_system + scp->cpu_iowait +
 287                  scp->cpu_idle + scp->cpu_steal +
 288                  scp->cpu_irq + scp->cpu_softirq));
 289 }
 290
 291 static void print_stats_cpu_struct(const struct stats_cpu *p,
 292                 const struct stats_cpu *c,
 293                 data_t itv)
 294 {
 295         printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
 296                 percent_value(p->cpu_user - p->cpu_guest,
 297                 /**/                          c->cpu_user - c->cpu_guest, itv),
 298                 percent_value(p->cpu_nice   , c->cpu_nice   , itv),
 299                 percent_value(p->cpu_system , c->cpu_system , itv),
 300                 percent_value(p->cpu_iowait , c->cpu_iowait , itv),
 301                 percent_value(p->cpu_irq    , c->cpu_irq    , itv),
 302                 percent_value(p->cpu_softirq, c->cpu_softirq, itv),
 303                 percent_value(p->cpu_steal  , c->cpu_steal  , itv),
 304                 percent_value(p->cpu_guest  , c->cpu_guest  , itv),
 305                 percent_value(p->cpu_idle   , c->cpu_idle   , itv)
 306         );
 307 }
 308
 309 static void write_stats_core(int prev, int current,
 310                 const char *prev_str, const char *current_str)
 311 {
 312         struct stats_cpu *scc, *scp;
 313         data_t itv, global_itv;
 314         int cpu;
 315
 316         /* Compute time interval */
 317         itv = global_itv = jiffies_diff(G.global_uptime[prev], G.global_uptime[current]);
 318
 319         /* Reduce interval to one CPU */
 320         if (G.cpu_nr > 1)
 321                 itv = jiffies_diff(G.per_cpu_uptime[prev], G.per_cpu_uptime[current]);
 322
 323         /* Print CPU stats */
 324         if (display_opt(D_CPU)) {
 325
 326                 ///* This is done exactly once */
 327                 //if (!G.header_done) {
 328                         printf("\n%-11s  CPU    %%usr   %%nice    %%sys %%iowait    %%irq   %%soft  %%steal  %%guest   %%idle\n",
 329                                 prev_str
 330                         );
 331                 //      G.header_done = 1;
 332                 //}
 333
 334                 for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
 335                         data_t per_cpu_itv;
 336
 337                         /* Print stats about this particular CPU? */
 338                         if (!is_cpu_in_bitmap(cpu))
 339                                 continue;
 340
 341                         scc = &G.st_cpu[current][cpu];
 342                         scp = &G.st_cpu[prev][cpu];
 343                         per_cpu_itv = global_itv;
 344
 345                         printf((cpu ? "%-11s %4u" : "%-11s  all"), current_str, cpu - 1);
 346                         if (cpu) {
 347                                 double idle;
 348                                 /*
 349                                  * If the CPU is offline, then it isn't in /proc/stat,
 350                                  * so all values are 0.
 351                                  * NB: Guest time is already included in user time.
 352                                  */
 353                                 if ((scc->cpu_user | scc->cpu_nice | scc->cpu_system |
 354                                      scc->cpu_iowait | scc->cpu_idle | scc->cpu_steal |
 355                                      scc->cpu_irq | scc->cpu_softirq) == 0
 356                                 ) {
 357                                         /*
 358                                          * Set current struct fields to values from prev.
 359                                          * iteration. Then their values won't jump from
 360                                          * zero, when the CPU comes back online.
 361                                          */
 362                                         *scc = *scp;
 363                                         idle = 0.0;
 364                                         goto print_zeros;
 365                                 }
 366                                 /* Compute interval again for current proc */
 367                                 per_cpu_itv = get_per_cpu_interval(scc, scp);
 368                                 if (per_cpu_itv == 0) {
 369                                         /*
 370                                          * If the CPU is tickless then there is no change in CPU values
 371                                          * but the sum of values is not zero.
 372                                          */
 373                                         idle = 100.0;
 374  print_zeros:
 375                                         printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
 376                                                 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, idle);
 377                                         continue;
 378                                 }
 379                         }
 380                         print_stats_cpu_struct(scp, scc, per_cpu_itv);
 381                 }
 382         }
 383
 384         /* Print total number of IRQs per CPU */
 385         if (display_opt(D_IRQ_SUM)) {
 386
 387                 ///* Print average header, this is done exactly once */
 388                 //if (!G.avg_header_done) {
 389                         printf("\n%-11s  CPU    intr/s\n", prev_str);
 390                 //      G.avg_header_done = 1;
 391                 //}
 392
 393                 for (cpu = 0; cpu <= G.cpu_nr; cpu++) {
 394                         data_t per_cpu_itv;
 395
 396                         /* Print stats about this CPU? */
 397                         if (!is_cpu_in_bitmap(cpu))
 398                                 continue;
 399
 400                         per_cpu_itv = itv;
 401                         printf((cpu ? "%-11s %4u" : "%-11s  all"), current_str, cpu - 1);
 402                         if (cpu) {
 403                                 scc = &G.st_cpu[current][cpu];
 404                                 scp = &G.st_cpu[prev][cpu];
 405                                 /* Compute interval again for current proc */
 406                                 per_cpu_itv = get_per_cpu_interval(scc, scp);
 407                                 if (per_cpu_itv == 0) {
 408                                         printf(" %9.2f\n", 0.0);
 409                                         continue;
 410                                 }
 411                         }
 412                         //bb_error_msg("G.st_irq[%u][%u].irq_nr:%lld - G.st_irq[%u][%u].irq_nr:%lld",
 413                         // current, cpu, G.st_irq[prev][cpu].irq_nr, prev, cpu, G.st_irq[current][cpu].irq_nr);
 414                         printf(" %9.2f\n", hz_value(G.st_irq[prev][cpu].irq_nr, G.st_irq[current][cpu].irq_nr, per_cpu_itv));
 415                 }
 416         }
 417
 418         if (display_opt(D_IRQ_CPU)) {
 419                 write_irqcpu_stats(G.st_irqcpu, G.irqcpu_nr,
 420                                 itv,
 421                                 prev, current,
 422                                 prev_str, current_str
 423                 );
 424         }
 425
 426         if (display_opt(D_SOFTIRQS)) {
 427                 write_irqcpu_stats(G.st_softirqcpu, G.softirqcpu_nr,
 428                                 itv,
 429                                 prev, current,
 430                                 prev_str, current_str
 431                 );
 432         }
 433 }
 434
 435 /*
 436  * Print the statistics
 437  */
 438 static void write_stats(int current)
 439 {
 440         char prev_time[16];
 441         char curr_time[16];
 442
 443         strftime(prev_time, sizeof(prev_time), "%X", &G.timestamp[!current]);
 444         strftime(curr_time, sizeof(curr_time), "%X", &G.timestamp[current]);
 445
 446         write_stats_core(!current, current, prev_time, curr_time);
 447 }
 448
 449 static void write_stats_avg(int current)
 450 {
 451         write_stats_core(2, current, "Average:", "Average:");
 452 }
 453
 454 /*
 455  * Read CPU statistics
 456  */
 457 static void get_cpu_statistics(struct stats_cpu *cpu, data_t *up, data_t *up0)
 458 {
 459         FILE *fp;
 460         char buf[1024];
 461
 462         fp = xfopen_for_read(PROCFS_STAT);
 463
 464         while (fgets(buf, sizeof(buf), fp)) {
 465                 data_t sum;
 466                 unsigned cpu_number;
 467                 struct stats_cpu *cp;
 468
 469                 if (!starts_with_cpu(buf))
 470                         continue; /* not "cpu" */
 471
 472                 cp = cpu; /* for "cpu " case */
 473                 if (buf[3] != ' ') {
 474                         /* "cpuN " */
 475                         if (G.cpu_nr == 0
 476                          || sscanf(buf + 3, "%u ", &cpu_number) != 1
 477                          || cpu_number >= G.cpu_nr
 478                         ) {
 479                                 continue;
 480                         }
 481                         cp = &cpu[cpu_number + 1];
 482                 }
 483
 484                 /* Read the counters, save them */
 485                 /* Not all fields have to be present */
 486                 memset(cp, 0, sizeof(*cp));
 487                 sscanf(buf, "%*s"
 488                         " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
 489                         " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u"
 490                         " %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u",
 491                         &cp->cpu_user, &cp->cpu_nice, &cp->cpu_system,
 492                         &cp->cpu_idle, &cp->cpu_iowait, &cp->cpu_irq,
 493                         &cp->cpu_softirq, &cp->cpu_steal, &cp->cpu_guest
 494                 );
 495                 /*
 496                  * Compute uptime in jiffies (1/HZ), it'll be the sum of
 497                  * individual CPU's uptimes.
 498                  * NB: We have to omit cpu_guest, because cpu_user includes it.
 499                  */
 500                 sum = cp->cpu_user + cp->cpu_nice + cp->cpu_system +
 501                         cp->cpu_idle + cp->cpu_iowait + cp->cpu_irq +
 502                         cp->cpu_softirq + cp->cpu_steal;
 503
 504                 if (buf[3] == ' ') {
 505                         /* "cpu " */
 506                         *up = sum;
 507                 } else {
 508                         /* "cpuN " */
 509                         if (cpu_number == 0 && *up0 != 0) {
 510                                 /* Compute uptime of single CPU */
 511                                 *up0 = sum;
 512                         }
 513                 }
 514         }
 515         fclose(fp);
 516 }
 517
 518 /*
 519  * Read IRQs from /proc/stat
 520  */
 521 static void get_irqs_from_stat(struct stats_irq *irq)
 522 {
 523         FILE *fp;
 524         char buf[1024];
 525
 526         fp = fopen_for_read(PROCFS_STAT);
 527         if (!fp)
 528                 return;
 529
 530         while (fgets(buf, sizeof(buf), fp)) {
 531                 //bb_error_msg("/proc/stat:'%s'", buf);
 532                 if (strncmp(buf, "intr ", 5) == 0) {
 533                         /* Read total number of IRQs since system boot */
 534                         sscanf(buf + 5, "%"FMT_DATA"u", &irq->irq_nr);
 535                 }
 536         }
 537
 538         fclose(fp);
 539 }
 540
 541 /*
 542  * Read stats from /proc/interrupts or /proc/softirqs
 543  */
 544 static void get_irqs_from_interrupts(const char *fname,
 545                 struct stats_irqcpu *per_cpu_stats[],
 546                 int irqs_per_cpu, int current)
 547 {
 548         FILE *fp;
 549         struct stats_irq *irq_i;
 550         struct stats_irqcpu *ic;
 551         char *buf;
 552         unsigned buflen;
 553         unsigned cpu;
 554         unsigned irq;
 555         int cpu_index[G.cpu_nr];
 556         int iindex;
 557
 558 // Moved to caller.
 559 // Otherwise reading of /proc/softirqs
 560 // was resetting counts to 0 after we painstakingly collected them from
 561 // /proc/interrupts. Which resulted in:
 562 // 01:32:47 PM  CPU    intr/s
 563 // 01:32:47 PM  all    591.47
 564 // 01:32:47 PM    0      0.00 <= ???
 565 // 01:32:47 PM    1      0.00 <= ???
 566 //      for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
 567 //              G.st_irq[current][cpu].irq_nr = 0;
 568 //              //bb_error_msg("G.st_irq[%u][%u].irq_nr=0", current, cpu);
 569 //      }
 570
 571         fp = fopen_for_read(fname);
 572         if (!fp)
 573                 return;
 574
 575         buflen = INTERRUPTS_LINE + 16 * G.cpu_nr;
 576         buf = xmalloc(buflen);
 577
 578         /* Parse header and determine, which CPUs are online */
 579         iindex = 0;
 580         while (fgets(buf, buflen, fp)) {
 581                 char *cp, *next;
 582                 next = buf;
 583                 while ((cp = strstr(next, "CPU")) != NULL
 584                  && iindex < G.cpu_nr
 585                 ) {
 586                         cpu = strtoul(cp + 3, &next, 10);
 587                         cpu_index[iindex++] = cpu;
 588                 }
 589                 if (iindex) /* We found header */
 590                         break;
 591         }
 592
 593         irq = 0;
 594         while (fgets(buf, buflen, fp)
 595          && irq < irqs_per_cpu
 596         ) {
 597                 int len;
 598                 char last_char;
 599                 char *cp;
 600
 601                 /* Skip over "IRQNAME:" */
 602                 cp = strchr(buf, ':');
 603                 if (!cp)
 604                         continue;
 605                 last_char = cp[-1];
 606
 607                 ic = &per_cpu_stats[current][irq];
 608                 len = cp - buf;
 609                 if (len >= sizeof(ic->irq_name)) {
 610                         len = sizeof(ic->irq_name) - 1;
 611                 }
 612                 safe_strncpy(ic->irq_name, buf, len + 1);
 613                 //bb_error_msg("%s: irq%d:'%s' buf:'%s'", fname, irq, ic->irq_name, buf);
 614                 cp++;
 615
 616                 for (cpu = 0; cpu < iindex; cpu++) {
 617                         char *next;
 618                         ic = &per_cpu_stats[current][cpu_index[cpu] * irqs_per_cpu + irq];
 619                         irq_i = &G.st_irq[current][cpu_index[cpu] + 1];
 620                         ic->interrupt = strtoul(cp, &next, 10);
 621                         /* Count only numerical IRQs */
 622                         if (isdigit(last_char)) {
 623                                 irq_i->irq_nr += ic->interrupt;
 624                                 //bb_error_msg("G.st_irq[%u][%u].irq_nr + %u = %lld",
 625                                 // current, cpu_index[cpu] + 1, ic->interrupt, irq_i->irq_nr);
 626                         }
 627                         cp = next;
 628                 }
 629                 irq++;
 630         }
 631         fclose(fp);
 632         free(buf);
 633
 634         while (irq < irqs_per_cpu) {
 635                 /* Number of interrupts per CPU has changed */
 636                 ic = &per_cpu_stats[current][irq];
 637                 ic->irq_name[0] = '\0'; /* False interrupt */
 638                 irq++;
 639         }
 640 }
 641
 642 static void get_uptime(data_t *uptime)
 643 {
 644         FILE *fp;
 645         char buf[sizeof(long)*3 * 2 + 4]; /* enough for long.long */
 646         unsigned long uptime_sec, decimal;
 647
 648         fp = fopen_for_read(PROCFS_UPTIME);
 649         if (!fp)
 650                 return;
 651         if (fgets(buf, sizeof(buf), fp)) {
 652                 if (sscanf(buf, "%lu.%lu", &uptime_sec, &decimal) == 2) {
 653                         *uptime = (data_t)uptime_sec * G.hz + decimal * G.hz / 100;
 654                 }
 655         }
 656
 657         fclose(fp);
 658 }
 659
 660 static void get_localtime(struct tm *tm)
 661 {
 662         time_t timer;
 663         time(&timer);
 664         localtime_r(&timer, tm);
 665 }
 666
 667 static void alarm_handler(int sig UNUSED_PARAM)
 668 {
 669         signal(SIGALRM, alarm_handler);
 670         alarm(G.interval);
 671 }
 672
 673 static void main_loop(void)
 674 {
 675         unsigned current;
 676         unsigned cpus;
 677
 678         /* Read the stats */
 679         if (G.cpu_nr > 1) {
 680                 G.per_cpu_uptime[0] = 0;
 681                 get_uptime(&G.per_cpu_uptime[0]);
 682         }
 683
 684         get_cpu_statistics(G.st_cpu[0], &G.global_uptime[0], &G.per_cpu_uptime[0]);
 685
 686         if (display_opt(D_IRQ_SUM))
 687                 get_irqs_from_stat(G.st_irq[0]);
 688
 689         if (display_opt(D_IRQ_SUM | D_IRQ_CPU))
 690                 get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
 691                                         G.irqcpu_nr, 0);
 692
 693         if (display_opt(D_SOFTIRQS))
 694                 get_irqs_from_interrupts(PROCFS_SOFTIRQS, G.st_softirqcpu,
 695                                         G.softirqcpu_nr, 0);
 696
 697         if (G.interval == 0) {
 698                 /* Display since boot time */
 699                 cpus = G.cpu_nr + 1;
 700                 G.timestamp[1] = G.timestamp[0];
 701                 memset(G.st_cpu[1], 0, sizeof(G.st_cpu[1][0]) * cpus);
 702                 memset(G.st_irq[1], 0, sizeof(G.st_irq[1][0]) * cpus);
 703                 memset(G.st_irqcpu[1], 0, sizeof(G.st_irqcpu[1][0]) * cpus * G.irqcpu_nr);
 704                 memset(G.st_softirqcpu[1], 0, sizeof(G.st_softirqcpu[1][0]) * cpus * G.softirqcpu_nr);
 705
 706                 write_stats(0);
 707
 708                 /* And we're done */
 709                 return;
 710         }
 711
 712         /* Set a handler for SIGALRM */
 713         alarm_handler(0);
 714
 715         /* Save the stats we already have. We need them to compute the average */
 716         G.timestamp[2] = G.timestamp[0];
 717         G.global_uptime[2] = G.global_uptime[0];
 718         G.per_cpu_uptime[2] = G.per_cpu_uptime[0];
 719         cpus = G.cpu_nr + 1;
 720         memcpy(G.st_cpu[2], G.st_cpu[0], sizeof(G.st_cpu[0][0]) * cpus);
 721         memcpy(G.st_irq[2], G.st_irq[0], sizeof(G.st_irq[0][0]) * cpus);
 722         memcpy(G.st_irqcpu[2], G.st_irqcpu[0], sizeof(G.st_irqcpu[0][0]) * cpus * G.irqcpu_nr);
 723         if (display_opt(D_SOFTIRQS)) {
 724                 memcpy(G.st_softirqcpu[2], G.st_softirqcpu[0],
 725                         sizeof(G.st_softirqcpu[0][0]) * cpus * G.softirqcpu_nr);
 726         }
 727
 728         current = 1;
 729         while (1) {
 730                 /* Suspend until a signal is received */
 731                 pause();
 732
 733                 /* Set structures to 0 to distinguish off/online CPUs */
 734                 memset(&G.st_cpu[current][/*cpu:*/ 1], 0, sizeof(G.st_cpu[0][0]) * G.cpu_nr);
 735
 736                 get_localtime(&G.timestamp[current]);
 737
 738                 /* Read stats */
 739                 if (G.cpu_nr > 1) {
 740                         G.per_cpu_uptime[current] = 0;
 741                         get_uptime(&G.per_cpu_uptime[current]);
 742                 }
 743                 get_cpu_statistics(G.st_cpu[current], &G.global_uptime[current], &G.per_cpu_uptime[current]);
 744
 745                 if (display_opt(D_IRQ_SUM))
 746                         get_irqs_from_stat(G.st_irq[current]);
 747
 748                 if (display_opt(D_IRQ_SUM | D_IRQ_CPU)) {
 749                         int cpu;
 750                         for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
 751                                 G.st_irq[current][cpu].irq_nr = 0;
 752                         }
 753                         /* accumulates .irq_nr */
 754                         get_irqs_from_interrupts(PROCFS_INTERRUPTS, G.st_irqcpu,
 755                                         G.irqcpu_nr, current);
 756                 }
 757
 758                 if (display_opt(D_SOFTIRQS))
 759                         get_irqs_from_interrupts(PROCFS_SOFTIRQS,
 760                                         G.st_softirqcpu,
 761                                         G.softirqcpu_nr, current);
 762
 763                 write_stats(current);
 764
 765                 if (G.count > 0) {
 766                         if (--G.count == 0)
 767                                 break;
 768                 }
 769
 770                 current ^= 1;
 771         }
 772
 773         /* Print average statistics */
 774         write_stats_avg(current);
 775 }
 776
 777 /* Initialization */
 778
 779 /* Get number of clock ticks per sec */
 780 static ALWAYS_INLINE unsigned get_hz(void)
 781 {
 782         return sysconf(_SC_CLK_TCK);
 783 }
 784
 785 static void alloc_struct(int cpus)
 786 {
 787         int i;
 788         for (i = 0; i < 3; i++) {
 789                 G.st_cpu[i] = xzalloc(sizeof(G.st_cpu[i][0]) * cpus);
 790                 G.st_irq[i] = xzalloc(sizeof(G.st_irq[i][0]) * cpus);
 791                 G.st_irqcpu[i] = xzalloc(sizeof(G.st_irqcpu[i][0]) * cpus * G.irqcpu_nr);
 792                 G.st_softirqcpu[i] = xzalloc(sizeof(G.st_softirqcpu[i][0]) * cpus * G.softirqcpu_nr);
 793         }
 794         G.cpu_bitmap_len = (cpus >> 3) + 1;
 795         G.cpu_bitmap = xzalloc(G.cpu_bitmap_len);
 796 }
 797
 798 static void print_header(struct tm *t)
 799 {
 800         char cur_date[16];
 801         struct utsname uts;
 802
 803         /* Get system name, release number and hostname */
 804         uname(&uts);
 805
 806         strftime(cur_date, sizeof(cur_date), "%x", t);
 807
 808         printf("%s %s (%s)\t%s\t_%s_\t(%u CPU)\n",
 809                 uts.sysname, uts.release, uts.nodename, cur_date, uts.machine, G.cpu_nr);
 810 }
 811
 812 /*
 813  * Get number of interrupts available per processor
 814  */
 815 static int get_irqcpu_nr(const char *f, int max_irqs)
 816 {
 817         FILE *fp;
 818         char *line;
 819         unsigned linelen;
 820         unsigned irq;
 821
 822         fp = fopen_for_read(f);
 823         if (!fp)                /* No interrupts file */
 824                 return 0;
 825
 826         linelen = INTERRUPTS_LINE + 16 * G.cpu_nr;
 827         line = xmalloc(linelen);
 828
 829         irq = 0;
 830         while (fgets(line, linelen, fp)
 831          && irq < max_irqs
 832         ) {
 833                 int p = strcspn(line, ":");
 834                 if ((p > 0) && (p < 16))
 835                         irq++;
 836         }
 837
 838         fclose(fp);
 839         free(line);
 840
 841         return irq;
 842 }
 843
 844 //usage:#define mpstat_trivial_usage
 845 //usage:       "[-A] [-I SUM|CPU|ALL|SCPU] [-u] [-P num|ALL] [INTERVAL [COUNT]]"
 846 //usage:#define mpstat_full_usage "\n\n"
 847 //usage:       "Per-processor statistics\n"
 848 //usage:     "\nOptions:"
 849 //usage:     "\n        -A                      Same as -I ALL -u -P ALL"
 850 //usage:     "\n        -I SUM|CPU|ALL|SCPU     Report interrupt statistics"
 851 //usage:     "\n        -P num|ALL              Processor to monitor"
 852 //usage:     "\n        -u                      Report CPU utilization"
 853
 854 int mpstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 855 int mpstat_main(int UNUSED_PARAM argc, char **argv)
 856 {
 857         char *opt_irq_fmt;
 858         char *opt_set_cpu;
 859         int i, opt;
 860         enum {
 861                 OPT_ALL    = 1 << 0,    /* -A */
 862                 OPT_INTS   = 1 << 1,    /* -I */
 863                 OPT_SETCPU = 1 << 2,    /* -P */
 864                 OPT_UTIL   = 1 << 3,    /* -u */
 865         };
 866
 867         /* Dont buffer data if redirected to a pipe */
 868         setbuf(stdout, NULL);
 869
 870         INIT_G();
 871
 872         G.interval = -1;
 873
 874         /* Get number of processors */
 875         G.cpu_nr = get_cpu_count();
 876
 877         /* Get number of clock ticks per sec */
 878         G.hz = get_hz();
 879
 880         /* Calculate number of interrupts per processor */
 881         G.irqcpu_nr = get_irqcpu_nr(PROCFS_INTERRUPTS, NR_IRQS) + NR_IRQCPU_PREALLOC;
 882
 883         /* Calculate number of soft interrupts per processor */
 884         G.softirqcpu_nr = get_irqcpu_nr(PROCFS_SOFTIRQS, NR_IRQS) + NR_IRQCPU_PREALLOC;
 885
 886         /* Allocate space for structures. + 1 for global structure. */
 887         alloc_struct(G.cpu_nr + 1);
 888
 889         /* Parse and process arguments */
 890         opt = getopt32(argv, "AI:P:u", &opt_irq_fmt, &opt_set_cpu);
 891         argv += optind;
 892
 893         if (*argv) {
 894                 /* Get interval */
 895                 G.interval = xatoi_positive(*argv);
 896                 G.count = -1;
 897                 argv++;
 898                 if (*argv) {
 899                         /* Get count value */
 900                         if (G.interval == 0)
 901                                 bb_show_usage();
 902                         G.count = xatoi_positive(*argv);
 903                         //if (*++argv)
 904                         //      bb_show_usage();
 905                 }
 906         }
 907         if (G.interval < 0)
 908                 G.interval = 0;
 909
 910         if (opt & OPT_ALL) {
 911                 G.p_option = 1;
 912                 G.options |= D_CPU + D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS;
 913                 /* Select every CPU */
 914                 memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
 915         }
 916
 917         if (opt & OPT_INTS) {
 918                 static const char v[] = {
 919                         D_IRQ_CPU, D_IRQ_SUM, D_SOFTIRQS,
 920                         D_IRQ_SUM + D_IRQ_CPU + D_SOFTIRQS
 921                 };
 922                 i = index_in_strings("CPU\0SUM\0SCPU\0ALL\0", opt_irq_fmt);
 923                 if (i == -1)
 924                         bb_show_usage();
 925                 G.options |= v[i];
 926         }
 927
 928         if ((opt & OPT_UTIL) /* -u? */
 929          || G.options == 0  /* nothing? (use default then) */
 930         ) {
 931                 G.options |= D_CPU;
 932         }
 933
 934         if (opt & OPT_SETCPU) {
 935                 char *t;
 936                 G.p_option = 1;
 937
 938                 for (t = strtok(opt_set_cpu, ","); t; t = strtok(NULL, ",")) {
 939                         if (strcmp(t, "ALL") == 0) {
 940                                 /* Select every CPU */
 941                                 memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
 942                         } else {
 943                                 /* Get CPU number */
 944                                 unsigned n = xatoi_positive(t);
 945                                 if (n >= G.cpu_nr)
 946                                         bb_error_msg_and_die("not that many processors");
 947                                 n++;
 948                                 G.cpu_bitmap[n >> 3] |= 1 << (n & 7);
 949                         }
 950                 }
 951         }
 952
 953         if (!G.p_option)
 954                 /* Display global stats */
 955                 G.cpu_bitmap[0] = 1;
 956
 957         /* Get time */
 958         get_localtime(&G.timestamp[0]);
 959
 960         /* Display header */
 961         print_header(&G.timestamp[0]);
 962
 963         /* The main loop */
 964         main_loop();
 965
 966         if (ENABLE_FEATURE_CLEAN_UP) {
 967                 /* Clean up */
 968                 for (i = 0; i < 3; i++) {
 969                         free(G.st_cpu[i]);
 970                         free(G.st_irq[i]);
 971                         free(G.st_irqcpu[i]);
 972                         free(G.st_softirqcpu[i]);
 973                 }
 974                 free(G.cpu_bitmap);
 975                 free(&G);
 976         }
 977
 978         return EXIT_SUCCESS;
 979 }