procps/powertop.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * A mini 'powertop' utility:
   4  *   Analyze power consumption on Intel-based laptops.
   5  * Based on powertop 1.11.
   6  *
   7  * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
   8  *
   9  * Licensed under GPLv2, see file LICENSE in this source tree.
  10  */
  11
  12 //applet:IF_POWERTOP(APPLET(powertop, _BB_DIR_BIN, _BB_SUID_DROP))
  13
  14 //kbuild:lib-$(CONFIG_POWERTOP) += powertop.o
  15
  16 //config:config POWERTOP
  17 //config:       bool "powertop"
  18 //config:       default y
  19 //config:       help
  20 //config:         Analyze power consumption on Intel-based laptops
  21
  22 // XXX This should be configurable
  23 #define ENABLE_FEATURE_POWERTOP_PROCIRQ 1
  24
  25 #include "libbb.h"
  26
  27
  28 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
  29 #define debug(fmt, ...) ((void)0)
  30
  31
  32 #define BLOATY_HPET_IRQ_NUM_DETECTION 0
  33 #define MAX_CSTATE_COUNT   8
  34 #define IRQCOUNT           40
  35
  36
  37 #define DEFAULT_SLEEP      10
  38 #define DEFAULT_SLEEP_STR "10"
  39
  40 /* Frequency of the ACPI timer */
  41 #define FREQ_ACPI          3579.545
  42 #define FREQ_ACPI_1000     3579545
  43
  44 /* Max filename length of entry in /sys/devices subsystem */
  45 #define BIG_SYSNAME_LEN    16
  46
  47 typedef unsigned long long ullong;
  48
  49 struct line {
  50         char *string;
  51         int count;
  52         /*int disk_count;*/
  53 };
  54
  55 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
  56 struct irqdata {
  57         smallint active;
  58         int number;
  59         ullong count;
  60         char irq_desc[32];
  61 };
  62 #endif
  63
  64 struct globals {
  65         struct line *lines; /* the most often used member */
  66         int lines_cnt;
  67         int lines_cumulative_count;
  68         int maxcstate;
  69         unsigned total_cpus;
  70         smallint cant_enable_timer_stats;
  71 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
  72 # if BLOATY_HPET_IRQ_NUM_DETECTION
  73         smallint scanned_timer_list;
  74         int percpu_hpet_start;
  75         int percpu_hpet_end;
  76 # endif
  77         int interrupt_0;
  78         int total_interrupt;
  79         struct irqdata interrupts[IRQCOUNT];
  80 #endif
  81         ullong start_usage[MAX_CSTATE_COUNT];
  82         ullong last_usage[MAX_CSTATE_COUNT];
  83         ullong start_duration[MAX_CSTATE_COUNT];
  84         ullong last_duration[MAX_CSTATE_COUNT];
  85         char cstate_names[MAX_CSTATE_COUNT][16];
  86 #if ENABLE_FEATURE_USE_TERMIOS
  87         struct termios init_settings;
  88 #endif
  89 };
  90 #define G (*ptr_to_globals)
  91 #define INIT_G() do { \
  92         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
  93 } while (0)
  94
  95 #if ENABLE_FEATURE_USE_TERMIOS
  96 static void reset_term(void)
  97 {
  98         tcsetattr_stdin_TCSANOW(&G.init_settings);
  99 }
 100
 101 static void sig_handler(int signo UNUSED_PARAM)
 102 {
 103         reset_term();
 104         _exit(EXIT_FAILURE);
 105 }
 106 #endif
 107
 108 static int write_str_to_file(const char *fname, const char *str)
 109 {
 110         FILE *fp = fopen_for_write(fname);
 111         if (!fp)
 112                 return 1;
 113         fputs(str, fp);
 114         fclose(fp);
 115         return 0;
 116 }
 117
 118 /* Make it more readable */
 119 #define start_timer()   write_str_to_file("/proc/timer_stats", "1\n")
 120 #define stop_timer()    write_str_to_file("/proc/timer_stats", "0\n")
 121
 122 static NOINLINE void clear_lines(void)
 123 {
 124         int i;
 125         if (G.lines) {
 126                 for (i = 0; i < G.lines_cnt; i++)
 127                         free(G.lines[i].string);
 128                 free(G.lines);
 129                 G.lines_cnt = 0;
 130                 G.lines = NULL;
 131         }
 132 }
 133
 134 static void update_lines_cumulative_count(void)
 135 {
 136         int i;
 137         for (i = 0; i < G.lines_cnt; i++)
 138                 G.lines_cumulative_count += G.lines[i].count;
 139 }
 140
 141 static int line_compare(const void *p1, const void *p2)
 142 {
 143         const struct line *a = p1;
 144         const struct line *b = p2;
 145         return (b->count /*+ 50 * b->disk_count*/) - (a->count /*+ 50 * a->disk_count*/);
 146 }
 147
 148 static void sort_lines(void)
 149 {
 150         qsort(G.lines, G.lines_cnt, sizeof(G.lines[0]), line_compare);
 151 }
 152
 153 /* Save C-state usage and duration. Also update maxcstate. */
 154 static void read_cstate_counts(ullong *usage, ullong *duration)
 155 {
 156         DIR *dir;
 157         struct dirent *d;
 158
 159         dir = opendir("/proc/acpi/processor");
 160         if (!dir)
 161                 return;
 162
 163         while ((d = readdir(dir)) != NULL) {
 164                 FILE *fp;
 165                 char buf[192];
 166                 int level;
 167                 int len;
 168
 169                 len = strlen(d->d_name); /* "CPUnn" */
 170                 if (len < 3 || len > BIG_SYSNAME_LEN)
 171                         continue;
 172
 173                 sprintf(buf, "/proc/acpi/processor/%s/power", d->d_name);
 174                 fp = fopen_for_read(buf);
 175                 if (!fp)
 176                         continue;
 177
 178 // Example file contents:
 179 // active state:            C0
 180 // max_cstate:              C8
 181 // maximum allowed latency: 2000000000 usec
 182 // states:
 183 //     C1:                  type[C1] promotion[--] demotion[--] latency[001] usage[00006173] duration[00000000000000000000]
 184 //     C2:                  type[C2] promotion[--] demotion[--] latency[001] usage[00085191] duration[00000000000083024907]
 185 //     C3:                  type[C3] promotion[--] demotion[--] latency[017] usage[01017622] duration[00000000017921327182]
 186                 level = 0;
 187                 while (fgets(buf, sizeof(buf), fp)) {
 188                         char *p = strstr(buf, "age[");
 189                         if (!p)
 190                                 continue;
 191                         p += 4;
 192                         usage[level] += bb_strtoull(p, NULL, 10) + 1;
 193                         p = strstr(buf, "ation[");
 194                         if (!p)
 195                                 continue;
 196                         p += 6;
 197                         duration[level] += bb_strtoull(p, NULL, 10);
 198
 199                         if (level >= MAX_CSTATE_COUNT-1)
 200                                 break;
 201                         level++;
 202                         if (level > G.maxcstate)  /* update maxcstate */
 203                                 G.maxcstate = level;
 204                 }
 205                 fclose(fp);
 206         }
 207         closedir(dir);
 208 }
 209
 210 /* Add line and/or update count */
 211 static void save_line(const char *string, int count)
 212 {
 213         int i;
 214         for (i = 0; i < G.lines_cnt; i++) {
 215                 if (strcmp(string, G.lines[i].string) == 0) {
 216                         /* It's already there, only update count */
 217                         G.lines[i].count += count;
 218                         return;
 219                 }
 220         }
 221
 222         /* Add new line */
 223         G.lines = xrealloc_vector(G.lines, 4, G.lines_cnt);
 224         G.lines[G.lines_cnt].string = xstrdup(string);
 225         G.lines[G.lines_cnt].count = count;
 226         /*G.lines[G.lines_cnt].disk_count = 0;*/
 227         G.lines_cnt++;
 228 }
 229
 230 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 231 static int is_hpet_irq(const char *name)
 232 {
 233         char *p;
 234 # if BLOATY_HPET_IRQ_NUM_DETECTION
 235         long hpet_chan;
 236
 237         /* Learn the range of existing hpet timers. This is done once */
 238         if (!G.scanned_timer_list) {
 239                 FILE *fp;
 240                 char buf[80];
 241
 242                 G.scanned_timer_list = true;
 243                 fp = fopen_for_read("/proc/timer_list");
 244                 if (!fp)
 245                         return 0;
 246
 247                 while (fgets(buf, sizeof(buf), fp)) {
 248                         p = strstr(buf, "Clock Event Device: hpet");
 249                         if (!p)
 250                                 continue;
 251                         p += sizeof("Clock Event Device: hpet")-1;
 252                         if (!isdigit(*p))
 253                                 continue;
 254                         hpet_chan = xatoi_positive(p);
 255                         if (hpet_chan < G.percpu_hpet_start)
 256                                 G.percpu_hpet_start = hpet_chan;
 257                         if (hpet_chan > G.percpu_hpet_end)
 258                                 G.percpu_hpet_end = hpet_chan;
 259                 }
 260                 fclose(fp);
 261         }
 262 # endif
 263 //TODO: optimize
 264         p = strstr(name, "hpet");
 265         if (!p)
 266                 return 0;
 267         p += 4;
 268         if (!isdigit(*p))
 269                 return 0;
 270 # if BLOATY_HPET_IRQ_NUM_DETECTION
 271         hpet_chan = xatoi_positive(p);
 272         if (hpet_chan < G.percpu_hpet_start || hpet_chan > G.percpu_hpet_end)
 273                 return 0;
 274 # endif
 275         return 1;
 276 }
 277
 278 /* Save new IRQ count, return delta from old one */
 279 static int save_irq_count(int irq, ullong count)
 280 {
 281         int unused = IRQCOUNT;
 282         int i;
 283         for (i = 0; i < IRQCOUNT; i++) {
 284                 if (G.interrupts[i].active && G.interrupts[i].number == irq) {
 285                         ullong old = G.interrupts[i].count;
 286                         G.interrupts[i].count = count;
 287                         return count - old;
 288                 }
 289                 if (!G.interrupts[i].active && unused > i)
 290                         unused = i;
 291         }
 292         if (unused < IRQCOUNT) {
 293                 G.interrupts[unused].active = 1;
 294                 G.interrupts[unused].count = count;
 295                 G.interrupts[unused].number = irq;
 296         }
 297         return count;
 298 }
 299
 300 /* Read /proc/interrupts, save IRQ counts and IRQ description */
 301 static void process_irq_counts(void)
 302 {
 303         FILE *fp;
 304         char buf[128];
 305
 306         /* Reset values */
 307         G.interrupt_0 = 0;
 308         G.total_interrupt = 0;
 309
 310         fp = xfopen_for_read("/proc/interrupts");
 311         while (fgets(buf, sizeof(buf), fp)) {
 312                 char irq_desc[sizeof("   <kernel IPI> : ") + sizeof(buf)];
 313                 char *p;
 314                 const char *name;
 315                 int nr;
 316                 ullong count;
 317                 ullong delta;
 318
 319                 p = strchr(buf, ':');
 320                 if (!p)
 321                         continue;
 322                 /*  0:  143646045  153901007   IO-APIC-edge      timer
 323                  *   ^
 324                  */
 325                 /* Deal with non-maskable interrupts -- make up fake numbers */
 326                 nr = -1;
 327                 if (buf[0] != ' ' && !isdigit(buf[0])) {
 328 //TODO: optimize
 329                         if (strncmp(buf, "NMI:", 4) == 0)
 330                                 nr = 20000;
 331                         if (strncmp(buf, "RES:", 4) == 0)
 332                                 nr = 20001;
 333                         if (strncmp(buf, "CAL:", 4) == 0)
 334                                 nr = 20002;
 335                         if (strncmp(buf, "TLB:", 4) == 0)
 336                                 nr = 20003;
 337                         if (strncmp(buf, "TRM:", 4) == 0)
 338                                 nr = 20004;
 339                         if (strncmp(buf, "THR:", 4) == 0)
 340                                 nr = 20005;
 341                         if (strncmp(buf, "SPU:", 4) == 0)
 342                                 nr = 20006;
 343                 } else {
 344                         /* bb_strtou doesn't eat leading spaces, using strtoul */
 345                         nr = strtoul(buf, NULL, 10);
 346                 }
 347                 if (nr == -1)
 348                         continue;
 349
 350                 p++;
 351                 /*  0:  143646045  153901007   IO-APIC-edge      timer
 352                  *    ^
 353                  */
 354                 /* Sum counts for this IRQ */
 355                 count = 0;
 356                 while (1) {
 357                         char *tmp;
 358                         p = skip_whitespace(p);
 359                         if (!isdigit(*p))
 360                                 break;
 361                         count += bb_strtoull(p, &tmp, 10);
 362                         p = tmp;
 363                 }
 364                 /*   0:  143646045  153901007   IO-APIC-edge      timer
 365                  * NMI:          1          2   Non-maskable interrupts
 366                  *                              ^
 367                  */
 368                 if (nr < 20000) {
 369                         /* Skip to the interrupt name, e.g. 'timer' */
 370                         p = strchr(p, ' ');
 371                         if (!p)
 372                                 continue;
 373                         p = skip_whitespace(p);
 374                 }
 375
 376                 name = p;
 377                 strchrnul(name, '\n')[0] = '\0';
 378                 /* Save description of the interrupt */
 379                 if (nr < 20000)
 380                         sprintf(irq_desc, "   <kernel IPI> : %s", name);
 381                 else
 382                         sprintf(irq_desc, "    <interrupt> : %s", name);
 383
 384                 delta = save_irq_count(nr, count);
 385
 386                 /* Skip per CPU timer interrupts */
 387                 if (is_hpet_irq(name))
 388                         continue;
 389
 390                 if (nr != 0 && delta != 0)
 391                         save_line(irq_desc, delta);
 392
 393                 if (nr == 0)
 394                         G.interrupt_0 = delta;
 395                 else
 396                         G.total_interrupt += delta;
 397         }
 398
 399         fclose(fp);
 400 }
 401 #else /* !ENABLE_FEATURE_POWERTOP_PROCIRQ */
 402 # define process_irq_counts()  ((void)0)
 403 #endif
 404
 405 static NOINLINE int process_timer_stats(void)
 406 {
 407         char buf[128];
 408         char line[15 + 3 + 128];
 409         int n;
 410         ullong totalticks;
 411         FILE *fp;
 412
 413         buf[0] = '\0';
 414         totalticks = 0;
 415
 416         fp = NULL;
 417         if (!G.cant_enable_timer_stats)
 418                 fp = fopen_for_read("/proc/timer_stats");
 419         if (fp) {
 420 // Example file contents:
 421 // Timer Stats Version: v0.2
 422 // Sample period: 1.329 s
 423 //    76,     0 swapper          hrtimer_start_range_ns (tick_sched_timer)
 424 //    88,     0 swapper          hrtimer_start_range_ns (tick_sched_timer)
 425 //    24,  3787 firefox          hrtimer_start_range_ns (hrtimer_wakeup)
 426 //   46D,  1136 kondemand/1      do_dbs_timer (delayed_work_timer_fn)
 427 // ...
 428 //     1,  1656 Xorg             hrtimer_start_range_ns (hrtimer_wakeup)
 429 //     1,  2159 udisks-daemon    hrtimer_start_range_ns (hrtimer_wakeup)
 430 // 331 total events, 249.059 events/sec
 431                 while (fgets(buf, sizeof(buf), fp)) {
 432                         const char *count, *process, *func;
 433                         char *p;
 434                         int cnt;
 435
 436                         count = skip_whitespace(buf);
 437                         p = strchr(count, ',');
 438                         if (!p)
 439                                 continue;
 440                         *p++ = '\0';
 441                         if (strcmp(strchrnul(count, ' '), " total events") == 0)
 442                                 break;
 443                         p = skip_whitespace(p); /* points to pid */
 444
 445 /* Find char ' ', then eat remaining spaces */
 446 #define ADVANCE(p) do {           \
 447         (p) = strchr((p), ' ');   \
 448         if (!(p))                 \
 449                 continue;         \
 450         *(p) = '\0';              \
 451         (p)++;                    \
 452         (p) = skip_whitespace(p); \
 453 } while (0)
 454                         /* Get process name */
 455                         ADVANCE(p);
 456                         process = p;
 457                         /* Get function */
 458                         ADVANCE(p);
 459                         func = p;
 460 #undef ADVANCE
 461                         //if (strcmp(process, "swapper") == 0
 462                         // && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
 463                         //) {
 464                         //      process = "[kernel scheduler]";
 465                         //      func = "Load balancing tick";
 466                         //}
 467
 468                         if (strncmp(func, "tick_nohz_", 10) == 0)
 469                                 continue;
 470                         if (strncmp(func, "tick_setup_sched_timer", 20) == 0)
 471                                 continue;
 472                         //if (strcmp(process, "powertop") == 0)
 473                         //      continue;
 474
 475                         if (strcmp(process, "insmod") == 0)
 476                                 process = "[kernel module]";
 477                         if (strcmp(process, "modprobe") == 0)
 478                                 process = "[kernel module]";
 479                         if (strcmp(process, "swapper") == 0)
 480                                 process = "<kernel core>";
 481
 482                         strchrnul(p, '\n')[0] = '\0';
 483
 484                         {
 485                                 char *tmp;
 486                                 cnt = bb_strtoull(count, &tmp, 10);
 487                                 p = tmp;
 488                         }
 489                         while (*p != '\0') {
 490                                 if (*p++ == 'D') /* deferred */
 491                                         goto skip;
 492                         }
 493
 494                         //if (strchr(process, '['))
 495                                 sprintf(line, "%15.15s : %s", process, func);
 496                         //else
 497                         //      sprintf(line, "%s", process);
 498                         save_line(line, cnt);
 499  skip: ;
 500                 }
 501                 fclose(fp);
 502         }
 503
 504         n = 0;
 505 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 506         if (strstr(buf, "total events")) {
 507                 n = bb_strtoull(buf, NULL, 10) / G.total_cpus;
 508                 if (n > 0 && n < G.interrupt_0) {
 509                         sprintf(line, "    <interrupt> : %s", "extra timer interrupt");
 510                         save_line(line, G.interrupt_0 - n);
 511                 }
 512         }
 513 #endif
 514         return n;
 515 }
 516
 517 #ifdef __i386__
 518 /*
 519  * Get information about CPU using CPUID opcode.
 520  */
 521 static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
 522                                   unsigned int *edx)
 523 {
 524         /* EAX value specifies what information to return */
 525         __asm__(
 526                 "       pushl %%ebx\n"     /* Save EBX */
 527                 "       cpuid\n"
 528                 "       movl %%ebx, %1\n"  /* Save content of EBX */
 529                 "       popl %%ebx\n"      /* Restore EBX */
 530                 : "=a"(*eax), /* Output */
 531                   "=r"(*ebx),
 532                   "=c"(*ecx),
 533                   "=d"(*edx)
 534                 : "0"(*eax),  /* Input */
 535                   "1"(*ebx),
 536                   "2"(*ecx),
 537                   "3"(*edx)
 538                 /* No clobbered registers */
 539         );
 540 }
 541 #endif
 542
 543 static NOINLINE void print_intel_cstates(void)
 544 {
 545 #ifdef __i386__
 546         int bios_table[8] = { 0 };
 547         int nbios = 0;
 548         DIR *cpudir;
 549         struct dirent *d;
 550         int i;
 551         unsigned eax, ebx, ecx, edx;
 552
 553         cpudir = opendir("/sys/devices/system/cpu");
 554         if (!cpudir)
 555                 return;
 556
 557         /* Loop over cpuN entries */
 558         while ((d = readdir(cpudir)) != NULL) {
 559                 DIR *dir;
 560                 int len;
 561                 char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
 562
 563                 len = strlen(d->d_name);
 564                 if (len < 3 || len > BIG_SYSNAME_LEN)
 565                         continue;
 566
 567                 if (!isdigit(d->d_name[3]))
 568                         continue;
 569
 570                 len = sprintf(fname, "/sys/devices/system/cpu/%s/cpuidle", d->d_name);
 571                 dir = opendir(fname);
 572                 if (!dir)
 573                         continue;
 574
 575                 /*
 576                  * Every C-state has its own stateN directory, that
 577                  * contains a 'time' and a 'usage' file.
 578                  */
 579                 while ((d = readdir(dir)) != NULL) {
 580                         FILE *fp;
 581                         char buf[64];
 582                         int n;
 583
 584                         n = strlen(d->d_name);
 585                         if (n < 3 || n > BIG_SYSNAME_LEN)
 586                                 continue;
 587
 588                         sprintf(fname + len, "/%s/desc", d->d_name);
 589                         fp = fopen_for_read(fname);
 590                         if (fp) {
 591                                 char *p = fgets(buf, sizeof(buf), fp);
 592                                 fclose(fp);
 593                                 if (!p)
 594                                         break;
 595                                 p = strstr(p, "MWAIT ");
 596                                 if (p) {
 597                                         int pos;
 598                                         p += sizeof("MWAIT ") - 1;
 599                                         pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
 600                                         if (pos >= ARRAY_SIZE(bios_table))
 601                                                 continue;
 602                                         bios_table[pos]++;
 603                                         nbios++;
 604                                 }
 605                         }
 606                 }
 607                 closedir(dir);
 608         }
 609         closedir(cpudir);
 610
 611         if (!nbios)
 612                 return;
 613
 614         eax = 5;
 615         ebx = ecx = edx = 0;
 616         cpuid(&eax, &ebx, &ecx, &edx);
 617         if (!edx || !(ecx & 1))
 618                 return;
 619
 620         printf("Your CPU supports the following C-states: ");
 621         i = 0;
 622         while (edx) {
 623                 if (edx & 7)
 624                         printf("C%u ", i);
 625                 edx >>= 4;
 626                 i++;
 627         }
 628         bb_putchar('\n');
 629
 630         /* Print BIOS C-States */
 631         printf("Your BIOS reports the following C-states: ");
 632         for (i = 0; i < 8; i++)
 633                 if (bios_table[i])
 634                         printf("C%u ", i);
 635
 636         bb_putchar('\n');
 637 #endif
 638 }
 639
 640 static void show_timerstats(void)
 641 {
 642         unsigned lines;
 643
 644         /* Get terminal height */
 645         get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
 646
 647         /* We don't have whole terminal just for timerstats */
 648         lines -= 12;
 649
 650         if (!G.cant_enable_timer_stats) {
 651                 int i, n = 0;
 652                 char strbuf6[6];
 653
 654                 strbuf6[5] = '\0';
 655                 puts("\nTop causes for wakeups:");
 656                 for (i = 0; i < G.lines_cnt; i++) {
 657                         if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
 658                          && n++ < lines
 659                         ) {
 660                                 /* NB: upstream powertop prints "(wakeups/sec)",
 661                                  * we print just "(wakeup counts)".
 662                                  */
 663                                 /*char c = ' ';
 664                                 if (G.lines[i].disk_count)
 665                                         c = 'D';*/
 666                                 smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY");
 667                                 printf(/*" %5.1f%% (%s)%c  %s\n"*/
 668                                         " %5.1f%% (%s)   %s\n",
 669                                         G.lines[i].count * 100.0 / G.lines_cumulative_count,
 670                                         strbuf6, /*c,*/
 671                                         G.lines[i].string);
 672                         }
 673                 }
 674         } else {
 675                 bb_putchar('\n');
 676                 bb_error_msg("no stats available; run as root or"
 677                                 " enable the cpufreq_stats module");
 678         }
 679 }
 680
 681 // Example display from powertop version 1.11
 682 // Cn                Avg residency       P-states (frequencies)
 683 // C0 (cpu running)        ( 0.5%)         2.00 Ghz     0.0%
 684 // polling           0.0ms ( 0.0%)         1.67 Ghz     0.0%
 685 // C1 mwait          0.0ms ( 0.0%)         1333 Mhz     0.1%
 686 // C2 mwait          0.1ms ( 0.1%)         1000 Mhz    99.9%
 687 // C3 mwait         12.1ms (99.4%)
 688 //
 689 // Wakeups-from-idle per second : 93.6     interval: 15.0s
 690 // no ACPI power usage estimate available
 691 //
 692 // Top causes for wakeups:
 693 //   32.4% ( 26.7)       <interrupt> : extra timer interrupt
 694 //   29.0% ( 23.9)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
 695 //    9.0% (  7.5)     <kernel core> : hrtimer_start (tick_sched_timer)
 696 //    6.5% (  5.3)       <interrupt> : ata_piix
 697 //    5.0% (  4.1)             inetd : hrtimer_start_range_ns (hrtimer_wakeup)
 698
 699 //usage:#define powertop_trivial_usage
 700 //usage:       ""
 701 //usage:#define powertop_full_usage "\n\n"
 702 //usage:       "Analyze power consumption on Intel-based laptops\n"
 703
 704 int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 705 int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
 706 {
 707         ullong cur_usage[MAX_CSTATE_COUNT];
 708         ullong cur_duration[MAX_CSTATE_COUNT];
 709         char cstate_lines[MAX_CSTATE_COUNT + 2][64];
 710 #if ENABLE_FEATURE_USE_TERMIOS
 711         struct termios new_settings;
 712         struct pollfd pfd[1];
 713
 714         pfd[0].fd = 0;
 715         pfd[0].events = POLLIN;
 716 #endif
 717
 718         INIT_G();
 719
 720 #if ENABLE_FEATURE_POWERTOP_PROCIRQ && BLOATY_HPET_IRQ_NUM_DETECTION
 721         G.percpu_hpet_start = INT_MAX;
 722         G.percpu_hpet_end = INT_MIN;
 723 #endif
 724
 725         /* Print warning when we don't have superuser privileges */
 726         if (geteuid() != 0)
 727                 bb_error_msg("run as root to collect enough information");
 728
 729         /* Get number of CPUs */
 730         G.total_cpus = get_cpu_count();
 731
 732         printf("Collecting data for "DEFAULT_SLEEP_STR" seconds\n");
 733
 734 #if ENABLE_FEATURE_USE_TERMIOS
 735         tcgetattr(0, (void *)&G.init_settings);
 736         memcpy(&new_settings, &G.init_settings, sizeof(new_settings));
 737         /* Turn on unbuffered input, turn off echoing */
 738         new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
 739         /* So we don't forget to reset term settings */
 740         atexit(reset_term);
 741         bb_signals(BB_FATAL_SIGS, sig_handler);
 742         tcsetattr_stdin_TCSANOW(&new_settings);
 743 #endif
 744
 745         /* Collect initial data */
 746         process_irq_counts();
 747
 748         /* Read initial usage and duration */
 749         read_cstate_counts(G.start_usage, G.start_duration);
 750
 751         /* Copy them to "last" */
 752         memcpy(G.last_usage, G.start_usage, sizeof(G.last_usage));
 753         memcpy(G.last_duration, G.start_duration, sizeof(G.last_duration));
 754
 755         /* Display C-states */
 756         print_intel_cstates();
 757
 758         G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
 759
 760         /* The main loop */
 761         for (;;) {
 762                 //double maxsleep = 0.0;
 763                 ullong totalticks, totalevents;
 764                 int i;
 765
 766                 G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
 767 #if !ENABLE_FEATURE_USE_TERMIOS
 768                 sleep(DEFAULT_SLEEP);
 769 #else
 770                 if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
 771                         unsigned char c;
 772                         if (safe_read(STDIN_FILENO, &c, 1) != 1)
 773                                 break; /* EOF/error */
 774                         if (c == G.init_settings.c_cc[VINTR])
 775                                 break; /* ^C */
 776                         if ((c | 0x20) == 'q')
 777                                 break;
 778                 }
 779 #endif
 780                 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
 781
 782                 clear_lines();
 783                 process_irq_counts();
 784
 785                 /* Clear the stats */
 786                 memset(cur_duration, 0, sizeof(cur_duration));
 787                 memset(cur_usage, 0, sizeof(cur_usage));
 788
 789                 /* Read them */
 790                 read_cstate_counts(cur_usage, cur_duration);
 791
 792                 /* Count totalticks and totalevents */
 793                 totalticks = totalevents = 0;
 794                 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
 795                         if (cur_usage[i] != 0) {
 796                                 totalticks += cur_duration[i] - G.last_duration[i];
 797                                 totalevents += cur_usage[i] - G.last_usage[i];
 798                         }
 799                 }
 800
 801                 /* Clear the screen */
 802                 printf("\033[H\033[J");
 803
 804                 /* Clear C-state lines */
 805                 memset(&cstate_lines, 0, sizeof(cstate_lines));
 806
 807                 if (totalevents == 0 && G.maxcstate <= 1) {
 808                         /* This should not happen */
 809                         sprintf(cstate_lines[5], "< Detailed C-state information is not "
 810                                 "available.>\n");
 811                 } else {
 812                         double percentage;
 813                         double newticks;
 814
 815                         newticks = G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000 - totalticks;
 816
 817                         /* Handle rounding errors: do not display negative values */
 818                         if (newticks < 0)
 819                                 newticks = 0;
 820
 821                         sprintf(cstate_lines[0], "Cn\t\t  Avg residency\n");
 822                         percentage = newticks * 100.0 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
 823                         sprintf(cstate_lines[1], "C0 (cpu running)        (%4.1f%%)\n",
 824                                 percentage);
 825
 826                         /* Compute values for individual C-states */
 827                         for (i = 0; i < MAX_CSTATE_COUNT; i++) {
 828                                 if (cur_usage[i] != 0) {
 829                                         double slept;
 830                                         slept = (cur_duration[i] - G.last_duration[i])
 831                                                 / (cur_usage[i] - G.last_usage[i] + 0.1) / FREQ_ACPI;
 832                                         percentage = (cur_duration[i] - G.last_duration[i]) * 100
 833                                                 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
 834
 835                                         if (!G.cstate_names[i][0])
 836                                                 sprintf(G.cstate_names[i], "C%u", i + 1);
 837                                         sprintf(cstate_lines[i + 2], "%s\t\t%5.1fms (%4.1f%%)\n",
 838                                                 G.cstate_names[i], slept, percentage);
 839                                         //if (maxsleep < slept)
 840                                         //      maxsleep = slept;
 841                                 }
 842                         }
 843                 }
 844
 845                 for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
 846                         if (cstate_lines[i][0])
 847                                 printf("%s", cstate_lines[i]);
 848
 849                 i = process_timer_stats();
 850 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 851                 if (totalevents == 0) {
 852                         /* No C-state info available, use timerstats */
 853                         totalevents = i * G.total_cpus + G.total_interrupt;
 854                         if (i < 0)
 855                                 totalevents += G.interrupt_0 - i;
 856                 }
 857 #endif
 858                 /* Upstream powertop prints wakeups per sec per CPU,
 859                  * we print just raw wakeup counts.
 860                  */
 861 //TODO: show real seconds (think about manual refresh)
 862                 printf("\nWakeups-from-idle in %u seconds: %llu\n",
 863                         DEFAULT_SLEEP,
 864                         totalevents
 865                 );
 866
 867                 update_lines_cumulative_count();
 868                 sort_lines();
 869                 show_timerstats();
 870                 fflush(stdout);
 871
 872                 /* Clear the stats */
 873                 memset(cur_duration, 0, sizeof(cur_duration));
 874                 memset(cur_usage, 0, sizeof(cur_usage));
 875
 876                 /* Get new values */
 877                 read_cstate_counts(cur_usage, cur_duration);
 878
 879                 /* Save them */
 880                 memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
 881                 memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));
 882         } /* for (;;) */
 883
 884         bb_putchar('\n');
 885
 886         return EXIT_SUCCESS;
 887 }