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