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_USR_SBIN, 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 //config:
  22 //config:config FEATURE_POWERTOP_INTERACTIVE
  23 //config:       bool "Accept keyboard commands"
  24 //config:       default y
  25 //config:       depends on POWERTOP
  26 //config:       help
  27 //config:         Without this, powertop will only refresh display every 10 seconds.
  28 //config:         No keyboard commands will work, only ^C to terminate.
  29
  30 // XXX This should be configurable
  31 #define ENABLE_FEATURE_POWERTOP_PROCIRQ 1
  32
  33 #include "libbb.h"
  34
  35
  36 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
  37 #define debug(fmt, ...) ((void)0)
  38
  39
  40 #define BLOATY_HPET_IRQ_NUM_DETECTION 0
  41 #define MAX_CSTATE_COUNT   8
  42 #define IRQCOUNT           40
  43
  44
  45 #define DEFAULT_SLEEP      10
  46 #define DEFAULT_SLEEP_STR "10"
  47
  48 /* Frequency of the ACPI timer */
  49 #define FREQ_ACPI          3579.545
  50 #define FREQ_ACPI_1000     3579545
  51
  52 /* Max filename length of entry in /sys/devices subsystem */
  53 #define BIG_SYSNAME_LEN    16
  54
  55 typedef unsigned long long ullong;
  56
  57 struct line {
  58         char *string;
  59         int count;
  60         /*int disk_count;*/
  61 };
  62
  63 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
  64 struct irqdata {
  65         smallint active;
  66         int number;
  67         ullong count;
  68         char irq_desc[32];
  69 };
  70 #endif
  71
  72 struct globals {
  73         struct line *lines; /* the most often used member */
  74         int lines_cnt;
  75         int lines_cumulative_count;
  76         int maxcstate;
  77         unsigned total_cpus;
  78         smallint cant_enable_timer_stats;
  79 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
  80 # if BLOATY_HPET_IRQ_NUM_DETECTION
  81         smallint scanned_timer_list;
  82         int percpu_hpet_start;
  83         int percpu_hpet_end;
  84 # endif
  85         int interrupt_0;
  86         int total_interrupt;
  87         struct irqdata interrupts[IRQCOUNT];
  88 #endif
  89         ullong start_usage[MAX_CSTATE_COUNT];
  90         ullong last_usage[MAX_CSTATE_COUNT];
  91         ullong start_duration[MAX_CSTATE_COUNT];
  92         ullong last_duration[MAX_CSTATE_COUNT];
  93 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
  94         struct termios init_settings;
  95 #endif
  96 };
  97 #define G (*ptr_to_globals)
  98 #define INIT_G() do { \
  99         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 100 } while (0)
 101
 102 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
 103 static void reset_term(void)
 104 {
 105         tcsetattr_stdin_TCSANOW(&G.init_settings);
 106 }
 107
 108 static void sig_handler(int signo UNUSED_PARAM)
 109 {
 110         reset_term();
 111         _exit(EXIT_FAILURE);
 112 }
 113 #endif
 114
 115 static int write_str_to_file(const char *fname, const char *str)
 116 {
 117         FILE *fp = fopen_for_write(fname);
 118         if (!fp)
 119                 return 1;
 120         fputs(str, fp);
 121         fclose(fp);
 122         return 0;
 123 }
 124
 125 /* Make it more readable */
 126 #define start_timer() write_str_to_file("/proc/timer_stats", "1\n")
 127 #define stop_timer()  write_str_to_file("/proc/timer_stats", "0\n")
 128
 129 static NOINLINE void clear_lines(void)
 130 {
 131         int i;
 132         if (G.lines) {
 133                 for (i = 0; i < G.lines_cnt; i++)
 134                         free(G.lines[i].string);
 135                 free(G.lines);
 136                 G.lines_cnt = 0;
 137                 G.lines = NULL;
 138         }
 139 }
 140
 141 static void update_lines_cumulative_count(void)
 142 {
 143         int i;
 144         for (i = 0; i < G.lines_cnt; i++)
 145                 G.lines_cumulative_count += G.lines[i].count;
 146 }
 147
 148 static int line_compare(const void *p1, const void *p2)
 149 {
 150         const struct line *a = p1;
 151         const struct line *b = p2;
 152         return (b->count /*+ 50 * b->disk_count*/) - (a->count /*+ 50 * a->disk_count*/);
 153 }
 154
 155 static void sort_lines(void)
 156 {
 157         qsort(G.lines, G.lines_cnt, sizeof(G.lines[0]), line_compare);
 158 }
 159
 160 /* Save C-state usage and duration. Also update maxcstate. */
 161 static void read_cstate_counts(ullong *usage, ullong *duration)
 162 {
 163         DIR *dir;
 164         struct dirent *d;
 165
 166         dir = opendir("/proc/acpi/processor");
 167         if (!dir)
 168                 return;
 169
 170         while ((d = readdir(dir)) != NULL) {
 171                 FILE *fp;
 172                 char buf[192];
 173                 int level;
 174                 int len;
 175
 176                 len = strlen(d->d_name); /* "CPUnn" */
 177                 if (len < 3 || len > BIG_SYSNAME_LEN)
 178                         continue;
 179
 180                 sprintf(buf, "%s/%s/power", "/proc/acpi/processor", d->d_name);
 181                 fp = fopen_for_read(buf);
 182                 if (!fp)
 183                         continue;
 184
 185 // Example file contents:
 186 // active state:            C0
 187 // max_cstate:              C8
 188 // maximum allowed latency: 2000000000 usec
 189 // states:
 190 //     C1:                  type[C1] promotion[--] demotion[--] latency[001] usage[00006173] duration[00000000000000000000]
 191 //     C2:                  type[C2] promotion[--] demotion[--] latency[001] usage[00085191] duration[00000000000083024907]
 192 //     C3:                  type[C3] promotion[--] demotion[--] latency[017] usage[01017622] duration[00000000017921327182]
 193                 level = 0;
 194                 while (fgets(buf, sizeof(buf), fp)) {
 195                         char *p = strstr(buf, "age[");
 196                         if (!p)
 197                                 continue;
 198                         p += 4;
 199                         usage[level] += bb_strtoull(p, NULL, 10) + 1;
 200                         p = strstr(buf, "ation[");
 201                         if (!p)
 202                                 continue;
 203                         p += 6;
 204                         duration[level] += bb_strtoull(p, NULL, 10);
 205
 206                         if (level >= MAX_CSTATE_COUNT-1)
 207                                 break;
 208                         level++;
 209                         if (level > G.maxcstate)  /* update maxcstate */
 210                                 G.maxcstate = level;
 211                 }
 212                 fclose(fp);
 213         }
 214         closedir(dir);
 215 }
 216
 217 /* Add line and/or update count */
 218 static void save_line(const char *string, int count)
 219 {
 220         int i;
 221         for (i = 0; i < G.lines_cnt; i++) {
 222                 if (strcmp(string, G.lines[i].string) == 0) {
 223                         /* It's already there, only update count */
 224                         G.lines[i].count += count;
 225                         return;
 226                 }
 227         }
 228
 229         /* Add new line */
 230         G.lines = xrealloc_vector(G.lines, 4, G.lines_cnt);
 231         G.lines[G.lines_cnt].string = xstrdup(string);
 232         G.lines[G.lines_cnt].count = count;
 233         /*G.lines[G.lines_cnt].disk_count = 0;*/
 234         G.lines_cnt++;
 235 }
 236
 237 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 238 static int is_hpet_irq(const char *name)
 239 {
 240         char *p;
 241 # if BLOATY_HPET_IRQ_NUM_DETECTION
 242         long hpet_chan;
 243
 244         /* Learn the range of existing hpet timers. This is done once */
 245         if (!G.scanned_timer_list) {
 246                 FILE *fp;
 247                 char buf[80];
 248
 249                 G.scanned_timer_list = true;
 250                 fp = fopen_for_read("/proc/timer_list");
 251                 if (!fp)
 252                         return 0;
 253
 254                 while (fgets(buf, sizeof(buf), fp)) {
 255                         p = strstr(buf, "Clock Event Device: hpet");
 256                         if (!p)
 257                                 continue;
 258                         p += sizeof("Clock Event Device: hpet")-1;
 259                         if (!isdigit(*p))
 260                                 continue;
 261                         hpet_chan = xatoi_positive(p);
 262                         if (hpet_chan < G.percpu_hpet_start)
 263                                 G.percpu_hpet_start = hpet_chan;
 264                         if (hpet_chan > G.percpu_hpet_end)
 265                                 G.percpu_hpet_end = hpet_chan;
 266                 }
 267                 fclose(fp);
 268         }
 269 # endif
 270 //TODO: optimize
 271         p = strstr(name, "hpet");
 272         if (!p)
 273                 return 0;
 274         p += 4;
 275         if (!isdigit(*p))
 276                 return 0;
 277 # if BLOATY_HPET_IRQ_NUM_DETECTION
 278         hpet_chan = xatoi_positive(p);
 279         if (hpet_chan < G.percpu_hpet_start || hpet_chan > G.percpu_hpet_end)
 280                 return 0;
 281 # endif
 282         return 1;
 283 }
 284
 285 /* Save new IRQ count, return delta from old one */
 286 static int save_irq_count(int irq, ullong count)
 287 {
 288         int unused = IRQCOUNT;
 289         int i;
 290         for (i = 0; i < IRQCOUNT; i++) {
 291                 if (G.interrupts[i].active && G.interrupts[i].number == irq) {
 292                         ullong old = G.interrupts[i].count;
 293                         G.interrupts[i].count = count;
 294                         return count - old;
 295                 }
 296                 if (!G.interrupts[i].active && unused > i)
 297                         unused = i;
 298         }
 299         if (unused < IRQCOUNT) {
 300                 G.interrupts[unused].active = 1;
 301                 G.interrupts[unused].count = count;
 302                 G.interrupts[unused].number = irq;
 303         }
 304         return count;
 305 }
 306
 307 /* Read /proc/interrupts, save IRQ counts and IRQ description */
 308 static void process_irq_counts(void)
 309 {
 310         FILE *fp;
 311         char buf[128];
 312
 313         /* Reset values */
 314         G.interrupt_0 = 0;
 315         G.total_interrupt = 0;
 316
 317         fp = xfopen_for_read("/proc/interrupts");
 318         while (fgets(buf, sizeof(buf), fp)) {
 319                 char irq_desc[sizeof("   <kernel IPI> : ") + sizeof(buf)];
 320                 char *p;
 321                 const char *name;
 322                 int nr;
 323                 ullong count;
 324                 ullong delta;
 325
 326                 p = strchr(buf, ':');
 327                 if (!p)
 328                         continue;
 329                 /*  0:  143646045  153901007   IO-APIC-edge      timer
 330                  *   ^
 331                  */
 332                 *p = '\0';
 333                 /* Deal with non-maskable interrupts -- make up fake numbers */
 334                 nr = index_in_strings("NMI\0RES\0CAL\0TLB\0TRM\0THR\0SPU\0", buf);
 335                 if (nr >= 0) {
 336                         nr += 20000;
 337                 } else {
 338                         /* bb_strtou doesn't eat leading spaces, using strtoul */
 339                         errno = 0;
 340                         nr = strtoul(buf, NULL, 10);
 341                         if (errno)
 342                                 continue;
 343                 }
 344                 p++;
 345                 /*  0:  143646045  153901007   IO-APIC-edge      timer
 346                  *    ^
 347                  */
 348                 /* Sum counts for this IRQ */
 349                 count = 0;
 350                 while (1) {
 351                         char *tmp;
 352                         p = skip_whitespace(p);
 353                         if (!isdigit(*p))
 354                                 break;
 355                         count += bb_strtoull(p, &tmp, 10);
 356                         p = tmp;
 357                 }
 358                 /*   0:  143646045  153901007   IO-APIC-edge      timer
 359                  * NMI:          1          2   Non-maskable interrupts
 360                  *                              ^
 361                  */
 362                 if (nr < 20000) {
 363                         /* Skip to the interrupt name, e.g. 'timer' */
 364                         p = strchr(p, ' ');
 365                         if (!p)
 366                                 continue;
 367                         p = skip_whitespace(p);
 368                 }
 369
 370                 name = p;
 371                 chomp(p);
 372                 /* Save description of the interrupt */
 373                 if (nr >= 20000)
 374                         sprintf(irq_desc, "   <kernel IPI> : %s", name);
 375                 else
 376                         sprintf(irq_desc, "    <interrupt> : %s", name);
 377
 378                 delta = save_irq_count(nr, count);
 379
 380                 /* Skip per CPU timer interrupts */
 381                 if (is_hpet_irq(name))
 382                         continue;
 383
 384                 if (nr != 0 && delta != 0)
 385                         save_line(irq_desc, delta);
 386
 387                 if (nr == 0)
 388                         G.interrupt_0 = delta;
 389                 else
 390                         G.total_interrupt += delta;
 391         }
 392
 393         fclose(fp);
 394 }
 395 #else /* !ENABLE_FEATURE_POWERTOP_PROCIRQ */
 396 # define process_irq_counts()  ((void)0)
 397 #endif
 398
 399 static NOINLINE int process_timer_stats(void)
 400 {
 401         char buf[128];
 402         char line[15 + 3 + 128];
 403         int n;
 404         FILE *fp;
 405
 406         buf[0] = '\0';
 407
 408         n = 0;
 409         fp = NULL;
 410         if (!G.cant_enable_timer_stats)
 411                 fp = fopen_for_read("/proc/timer_stats");
 412         if (fp) {
 413 // Example file contents:
 414 // Timer Stats Version: v0.2
 415 // Sample period: 1.329 s
 416 //    76,     0 swapper          hrtimer_start_range_ns (tick_sched_timer)
 417 //    88,     0 swapper          hrtimer_start_range_ns (tick_sched_timer)
 418 //    24,  3787 firefox          hrtimer_start_range_ns (hrtimer_wakeup)
 419 //   46D,  1136 kondemand/1      do_dbs_timer (delayed_work_timer_fn)
 420 // ...
 421 //     1,  1656 Xorg             hrtimer_start_range_ns (hrtimer_wakeup)
 422 //     1,  2159 udisks-daemon    hrtimer_start_range_ns (hrtimer_wakeup)
 423 // 331 total events, 249.059 events/sec
 424                 while (fgets(buf, sizeof(buf), fp)) {
 425                         const char *count, *process, *func;
 426                         char *p;
 427                         int idx;
 428                         unsigned cnt;
 429
 430                         count = skip_whitespace(buf);
 431                         p = strchr(count, ',');
 432                         if (!p)
 433                                 continue;
 434                         *p++ = '\0';
 435                         cnt = bb_strtou(count, NULL, 10);
 436                         if (strcmp(skip_non_whitespace(count), " total events") == 0) {
 437 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 438                                 n = cnt / G.total_cpus;
 439                                 if (n > 0 && n < G.interrupt_0) {
 440                                         sprintf(line, "    <interrupt> : %s", "extra timer interrupt");
 441                                         save_line(line, G.interrupt_0 - n);
 442                                 }
 443 #endif
 444                                 break;
 445                         }
 446                         if (strchr(count, 'D'))
 447                                 continue; /* deferred */
 448                         p = skip_whitespace(p); /* points to pid now */
 449                         process = NULL;
 450  get_func_name:
 451                         p = strchr(p, ' ');
 452                         if (!p)
 453                                 continue;
 454                         *p++ = '\0';
 455                         p = skip_whitespace(p);
 456                         if (process == NULL) {
 457                                 process = p;
 458                                 goto get_func_name;
 459                         }
 460                         func = p;
 461
 462                         //if (strcmp(process, "swapper") == 0
 463                         // && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
 464                         //) {
 465                         //      process = "[kernel scheduler]";
 466                         //      func = "Load balancing tick";
 467                         //}
 468
 469                         if (is_prefixed_with(func, "tick_nohz_"))
 470                                 continue;
 471                         if (is_prefixed_with(func, "tick_setup_sched_timer"))
 472                                 continue;
 473                         //if (strcmp(process, "powertop") == 0)
 474                         //      continue;
 475
 476                         idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
 477                         if (idx != -1) {
 478                                 process = idx < 2 ? "[kernel module]" : "<kernel core>";
 479                         }
 480
 481                         chomp(p);
 482
 483                         // 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
 484                         // ^          ^            ^
 485                         // count      process      func
 486
 487                         //if (strchr(process, '['))
 488                                 sprintf(line, "%15.15s : %s", process, func);
 489                         //else
 490                         //      sprintf(line, "%s", process);
 491                         save_line(line, cnt);
 492                 }
 493                 fclose(fp);
 494         }
 495
 496         return n;
 497 }
 498
 499 #ifdef __i386__
 500 /*
 501  * Get information about CPU using CPUID opcode.
 502  */
 503 static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
 504                                 unsigned int *edx)
 505 {
 506         /* EAX value specifies what information to return */
 507         __asm__(
 508                 "       pushl %%ebx\n"     /* Save EBX */
 509                 "       cpuid\n"
 510                 "       movl %%ebx, %1\n"  /* Save content of EBX */
 511                 "       popl %%ebx\n"      /* Restore EBX */
 512                 : "=a"(*eax), /* Output */
 513                   "=r"(*ebx),
 514                   "=c"(*ecx),
 515                   "=d"(*edx)
 516                 : "0"(*eax),  /* Input */
 517                   "1"(*ebx),
 518                   "2"(*ecx),
 519                   "3"(*edx)
 520                 /* No clobbered registers */
 521         );
 522 }
 523 #endif
 524
 525 #ifdef __i386__
 526 static NOINLINE void print_intel_cstates(void)
 527 {
 528         int bios_table[8] = { 0 };
 529         int nbios = 0;
 530         DIR *cpudir;
 531         struct dirent *d;
 532         int i;
 533         unsigned eax, ebx, ecx, edx;
 534
 535         cpudir = opendir("/sys/devices/system/cpu");
 536         if (!cpudir)
 537                 return;
 538
 539         /* Loop over cpuN entries */
 540         while ((d = readdir(cpudir)) != NULL) {
 541                 DIR *dir;
 542                 int len;
 543                 char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
 544
 545                 len = strlen(d->d_name);
 546                 if (len < 3 || len > BIG_SYSNAME_LEN)
 547                         continue;
 548
 549                 if (!isdigit(d->d_name[3]))
 550                         continue;
 551
 552                 len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
 553                 dir = opendir(fname);
 554                 if (!dir)
 555                         continue;
 556
 557                 /*
 558                  * Every C-state has its own stateN directory, that
 559                  * contains a 'time' and a 'usage' file.
 560                  */
 561                 while ((d = readdir(dir)) != NULL) {
 562                         FILE *fp;
 563                         char buf[64];
 564                         int n;
 565
 566                         n = strlen(d->d_name);
 567                         if (n < 3 || n > BIG_SYSNAME_LEN)
 568                                 continue;
 569
 570                         sprintf(fname + len, "/%s/desc", d->d_name);
 571                         fp = fopen_for_read(fname);
 572                         if (fp) {
 573                                 char *p = fgets(buf, sizeof(buf), fp);
 574                                 fclose(fp);
 575                                 if (!p)
 576                                         break;
 577                                 p = strstr(p, "MWAIT ");
 578                                 if (p) {
 579                                         int pos;
 580                                         p += sizeof("MWAIT ") - 1;
 581                                         pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
 582                                         if (pos >= ARRAY_SIZE(bios_table))
 583                                                 continue;
 584                                         bios_table[pos]++;
 585                                         nbios++;
 586                                 }
 587                         }
 588                 }
 589                 closedir(dir);
 590         }
 591         closedir(cpudir);
 592
 593         if (!nbios)
 594                 return;
 595
 596         eax = 5;
 597         ebx = ecx = edx = 0;
 598         cpuid(&eax, &ebx, &ecx, &edx);
 599         if (!edx || !(ecx & 1))
 600                 return;
 601
 602         printf("Your %s the following C-states: ", "CPU supports");
 603         i = 0;
 604         while (edx) {
 605                 if (edx & 7)
 606                         printf("C%u ", i);
 607                 edx >>= 4;
 608                 i++;
 609         }
 610         bb_putchar('\n');
 611
 612         /* Print BIOS C-States */
 613         printf("Your %s the following C-states: ", "BIOS reports");
 614         for (i = 0; i < ARRAY_SIZE(bios_table); i++)
 615                 if (bios_table[i])
 616                         printf("C%u ", i);
 617
 618         bb_putchar('\n');
 619 }
 620 #else
 621 # define print_intel_cstates() ((void)0)
 622 #endif
 623
 624 static void show_timerstats(void)
 625 {
 626         unsigned lines;
 627
 628         /* Get terminal height */
 629         get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
 630
 631         /* We don't have whole terminal just for timerstats */
 632         lines -= 12;
 633
 634         if (!G.cant_enable_timer_stats) {
 635                 int i, n = 0;
 636                 char strbuf6[6];
 637
 638                 puts("\nTop causes for wakeups:");
 639                 for (i = 0; i < G.lines_cnt; i++) {
 640                         if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
 641                          && n++ < lines
 642                         ) {
 643                                 /* NB: upstream powertop prints "(wakeups/sec)",
 644                                  * we print just "(wakeup counts)".
 645                                  */
 646                                 /*char c = ' ';
 647                                 if (G.lines[i].disk_count)
 648                                         c = 'D';*/
 649                                 smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY")[0] = '\0';
 650                                 printf(/*" %5.1f%% (%s)%c  %s\n"*/
 651                                         " %5.1f%% (%s)   %s\n",
 652                                         G.lines[i].count * 100.0 / G.lines_cumulative_count,
 653                                         strbuf6, /*c,*/
 654                                         G.lines[i].string);
 655                         }
 656                 }
 657         } else {
 658                 bb_putchar('\n');
 659                 bb_error_msg("no stats available; run as root or"
 660                                 " enable the timer_stats module");
 661         }
 662 }
 663
 664 // Example display from powertop version 1.11
 665 // Cn                Avg residency       P-states (frequencies)
 666 // C0 (cpu running)        ( 0.5%)         2.00 Ghz     0.0%
 667 // polling           0.0ms ( 0.0%)         1.67 Ghz     0.0%
 668 // C1 mwait          0.0ms ( 0.0%)         1333 Mhz     0.1%
 669 // C2 mwait          0.1ms ( 0.1%)         1000 Mhz    99.9%
 670 // C3 mwait         12.1ms (99.4%)
 671 //
 672 // Wakeups-from-idle per second : 93.6     interval: 15.0s
 673 // no ACPI power usage estimate available
 674 //
 675 // Top causes for wakeups:
 676 //   32.4% ( 26.7)       <interrupt> : extra timer interrupt
 677 //   29.0% ( 23.9)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
 678 //    9.0% (  7.5)     <kernel core> : hrtimer_start (tick_sched_timer)
 679 //    6.5% (  5.3)       <interrupt> : ata_piix
 680 //    5.0% (  4.1)             inetd : hrtimer_start_range_ns (hrtimer_wakeup)
 681
 682 //usage:#define powertop_trivial_usage
 683 //usage:       ""
 684 //usage:#define powertop_full_usage "\n\n"
 685 //usage:       "Analyze power consumption on Intel-based laptops"
 686
 687 int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 688 int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
 689 {
 690         ullong cur_usage[MAX_CSTATE_COUNT];
 691         ullong cur_duration[MAX_CSTATE_COUNT];
 692         char cstate_lines[MAX_CSTATE_COUNT + 2][64];
 693 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
 694         struct pollfd pfd[1];
 695
 696         pfd[0].fd = 0;
 697         pfd[0].events = POLLIN;
 698 #endif
 699
 700         INIT_G();
 701
 702 #if ENABLE_FEATURE_POWERTOP_PROCIRQ && BLOATY_HPET_IRQ_NUM_DETECTION
 703         G.percpu_hpet_start = INT_MAX;
 704         G.percpu_hpet_end = INT_MIN;
 705 #endif
 706
 707         /* Print warning when we don't have superuser privileges */
 708         if (geteuid() != 0)
 709                 bb_error_msg("run as root to collect enough information");
 710
 711         /* Get number of CPUs */
 712         G.total_cpus = get_cpu_count();
 713
 714         puts("Collecting data for "DEFAULT_SLEEP_STR" seconds");
 715
 716 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
 717         /* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
 718         set_termios_to_raw(STDIN_FILENO, &G.init_settings, TERMIOS_CLEAR_ISIG);
 719         bb_signals(BB_FATAL_SIGS, sig_handler);
 720         /* So we don't forget to reset term settings */
 721         atexit(reset_term);
 722 #endif
 723
 724         /* Collect initial data */
 725         process_irq_counts();
 726
 727         /* Read initial usage and duration */
 728         read_cstate_counts(G.start_usage, G.start_duration);
 729
 730         /* Copy them to "last" */
 731         memcpy(G.last_usage, G.start_usage, sizeof(G.last_usage));
 732         memcpy(G.last_duration, G.start_duration, sizeof(G.last_duration));
 733
 734         /* Display C-states */
 735         print_intel_cstates();
 736
 737         G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
 738
 739         /* The main loop */
 740         for (;;) {
 741                 //double maxsleep = 0.0;
 742                 ullong totalticks, totalevents;
 743                 int i;
 744
 745                 G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
 746 #if !ENABLE_FEATURE_POWERTOP_INTERACTIVE
 747                 sleep(DEFAULT_SLEEP);
 748 #else
 749                 if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
 750                         unsigned char c;
 751                         if (safe_read(STDIN_FILENO, &c, 1) != 1)
 752                                 break; /* EOF/error */
 753                         if (c == G.init_settings.c_cc[VINTR])
 754                                 break; /* ^C */
 755                         if ((c | 0x20) == 'q')
 756                                 break;
 757                 }
 758 #endif
 759                 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
 760
 761                 clear_lines();
 762                 process_irq_counts();
 763
 764                 /* Clear the stats */
 765                 memset(cur_duration, 0, sizeof(cur_duration));
 766                 memset(cur_usage, 0, sizeof(cur_usage));
 767
 768                 /* Read them */
 769                 read_cstate_counts(cur_usage, cur_duration);
 770
 771                 /* Count totalticks and totalevents */
 772                 totalticks = totalevents = 0;
 773                 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
 774                         if (cur_usage[i] != 0) {
 775                                 totalticks += cur_duration[i] - G.last_duration[i];
 776                                 totalevents += cur_usage[i] - G.last_usage[i];
 777                         }
 778                 }
 779
 780                 /* Clear the screen */
 781                 printf("\033[H\033[J");
 782
 783                 /* Clear C-state lines */
 784                 memset(&cstate_lines, 0, sizeof(cstate_lines));
 785
 786                 if (totalevents == 0 && G.maxcstate <= 1) {
 787                         /* This should not happen */
 788                         strcpy(cstate_lines[0], "C-state information is not available\n");
 789                 } else {
 790                         double percentage;
 791                         unsigned newticks;
 792
 793                         newticks = G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000 - totalticks;
 794                         /* Handle rounding errors: do not display negative values */
 795                         if ((int)newticks < 0)
 796                                 newticks = 0;
 797
 798                         sprintf(cstate_lines[0], "Cn\t\t  Avg residency\n");
 799                         percentage = newticks * 100.0 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
 800                         sprintf(cstate_lines[1], "C0 (cpu running)        (%4.1f%%)\n", percentage);
 801
 802                         /* Compute values for individual C-states */
 803                         for (i = 0; i < MAX_CSTATE_COUNT; i++) {
 804                                 if (cur_usage[i] != 0) {
 805                                         double slept;
 806                                         slept = (cur_duration[i] - G.last_duration[i])
 807                                                 / (cur_usage[i] - G.last_usage[i] + 0.1) / FREQ_ACPI;
 808                                         percentage = (cur_duration[i] - G.last_duration[i]) * 100
 809                                                 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
 810                                         sprintf(cstate_lines[i + 2], "C%u\t\t%5.1fms (%4.1f%%)\n",
 811                                                 i + 1, slept, percentage);
 812                                         //if (maxsleep < slept)
 813                                         //      maxsleep = slept;
 814                                 }
 815                         }
 816                 }
 817
 818                 for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
 819                         if (cstate_lines[i][0])
 820                                 fputs(cstate_lines[i], stdout);
 821
 822                 i = process_timer_stats();
 823 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 824                 if (totalevents == 0) {
 825                         /* No C-state info available, use timerstats */
 826                         totalevents = i * G.total_cpus + G.total_interrupt;
 827                         if (i < 0)
 828                                 totalevents += G.interrupt_0 - i;
 829                 }
 830 #endif
 831                 /* Upstream powertop prints wakeups per sec per CPU,
 832                  * we print just raw wakeup counts.
 833                  */
 834 //TODO: show real seconds (think about manual refresh)
 835                 printf("\nWakeups-from-idle in %u seconds: %llu\n",
 836                         DEFAULT_SLEEP,
 837                         totalevents
 838                 );
 839
 840                 update_lines_cumulative_count();
 841                 sort_lines();
 842                 show_timerstats();
 843                 fflush(stdout);
 844
 845                 /* Clear the stats */
 846                 memset(cur_duration, 0, sizeof(cur_duration));
 847                 memset(cur_usage, 0, sizeof(cur_usage));
 848
 849                 /* Get new values */
 850                 read_cstate_counts(cur_usage, cur_duration);
 851
 852                 /* Save them */
 853                 memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
 854                 memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));
 855         } /* for (;;) */
 856
 857         bb_putchar('\n');
 858
 859         return EXIT_SUCCESS;
 860 }