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 //config:config POWERTOP
  12 //config:       bool "powertop (9.1 kb)"
  13 //config:       default y
  14 //config:       help
  15 //config:       Analyze power consumption on Intel-based laptops
  16 //config:
  17 //config:config FEATURE_POWERTOP_INTERACTIVE
  18 //config:       bool "Accept keyboard commands"
  19 //config:       default y
  20 //config:       depends on POWERTOP
  21 //config:       help
  22 //config:       Without this, powertop will only refresh display every 10 seconds.
  23 //config:       No keyboard commands will work, only ^C to terminate.
  24
  25 //applet:IF_POWERTOP(APPLET(powertop, BB_DIR_USR_SBIN, BB_SUID_DROP))
  26
  27 //kbuild:lib-$(CONFIG_POWERTOP) += powertop.o
  28
  29 // XXX This should be configurable
  30 #define ENABLE_FEATURE_POWERTOP_PROCIRQ 1
  31
  32 #include "libbb.h"
  33
  34
  35 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
  36 #define debug(fmt, ...) ((void)0)
  37
  38
  39 #define BLOATY_HPET_IRQ_NUM_DETECTION 0
  40 #define MAX_CSTATE_COUNT   8
  41 #define IRQCOUNT           40
  42
  43
  44 #define DEFAULT_SLEEP      10
  45 #define DEFAULT_SLEEP_STR "10"
  46
  47 /* Frequency of the ACPI timer */
  48 #define FREQ_ACPI          3579.545
  49 #define FREQ_ACPI_1000     3579545
  50
  51 /* Max filename length of entry in /sys/devices subsystem */
  52 #define BIG_SYSNAME_LEN    16
  53
  54 typedef unsigned long long ullong;
  55
  56 struct line {
  57         char *string;
  58         int count;
  59         /*int disk_count;*/
  60 };
  61
  62 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
  63 struct irqdata {
  64         smallint active;
  65         int number;
  66         ullong count;
  67         char irq_desc[32];
  68 };
  69 #endif
  70
  71 struct globals {
  72         struct line *lines; /* the most often used member */
  73         int lines_cnt;
  74         int lines_cumulative_count;
  75         int maxcstate;
  76         unsigned total_cpus;
  77         smallint cant_enable_timer_stats;
  78 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
  79 # if BLOATY_HPET_IRQ_NUM_DETECTION
  80         smallint scanned_timer_list;
  81         int percpu_hpet_start;
  82         int percpu_hpet_end;
  83 # endif
  84         int interrupt_0;
  85         int total_interrupt;
  86         struct irqdata interrupts[IRQCOUNT];
  87 #endif
  88         ullong start_usage[MAX_CSTATE_COUNT];
  89         ullong last_usage[MAX_CSTATE_COUNT];
  90         ullong start_duration[MAX_CSTATE_COUNT];
  91         ullong last_duration[MAX_CSTATE_COUNT];
  92 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
  93         struct termios init_settings;
  94 #endif
  95 };
  96 #define G (*ptr_to_globals)
  97 #define INIT_G() do { \
  98         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
  99 } while (0)
 100
 101 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
 102 static void reset_term(void)
 103 {
 104         tcsetattr_stdin_TCSANOW(&G.init_settings);
 105 }
 106
 107 static void sig_handler(int signo UNUSED_PARAM)
 108 {
 109         reset_term();
 110         _exit(EXIT_FAILURE);
 111 }
 112 #endif
 113
 114 static int write_str_to_file(const char *fname, const char *str)
 115 {
 116         FILE *fp = fopen_for_write(fname);
 117         if (!fp)
 118                 return 1;
 119         fputs(str, fp);
 120         fclose(fp);
 121         return 0;
 122 }
 123
 124 /* Make it more readable */
 125 #define start_timer() write_str_to_file("/proc/timer_stats", "1\n")
 126 #define stop_timer()  write_str_to_file("/proc/timer_stats", "0\n")
 127
 128 static NOINLINE void clear_lines(void)
 129 {
 130         int i;
 131         if (G.lines) {
 132                 for (i = 0; i < G.lines_cnt; i++)
 133                         free(G.lines[i].string);
 134                 free(G.lines);
 135                 G.lines_cnt = 0;
 136                 G.lines = NULL;
 137         }
 138 }
 139
 140 static void update_lines_cumulative_count(void)
 141 {
 142         int i;
 143         for (i = 0; i < G.lines_cnt; i++)
 144                 G.lines_cumulative_count += G.lines[i].count;
 145 }
 146
 147 static int line_compare(const void *p1, const void *p2)
 148 {
 149         const struct line *a = p1;
 150         const struct line *b = p2;
 151         return (b->count /*+ 50 * b->disk_count*/) - (a->count /*+ 50 * a->disk_count*/);
 152 }
 153
 154 static void sort_lines(void)
 155 {
 156         qsort(G.lines, G.lines_cnt, sizeof(G.lines[0]), line_compare);
 157 }
 158
 159 /* Save C-state usage and duration. Also update maxcstate. */
 160 static void read_cstate_counts(ullong *usage, ullong *duration)
 161 {
 162         DIR *dir;
 163         struct dirent *d;
 164
 165         dir = opendir("/proc/acpi/processor");
 166         if (!dir)
 167                 return;
 168
 169         while ((d = readdir(dir)) != NULL) {
 170                 FILE *fp;
 171                 char buf[192];
 172                 int level;
 173                 int len;
 174
 175                 len = strlen(d->d_name); /* "CPUnn" */
 176                 if (len < 3 || len > BIG_SYSNAME_LEN)
 177                         continue;
 178
 179                 sprintf(buf, "%s/%s/power", "/proc/acpi/processor", d->d_name);
 180                 fp = fopen_for_read(buf);
 181                 if (!fp)
 182                         continue;
 183
 184 // Example file contents:
 185 // active state:            C0
 186 // max_cstate:              C8
 187 // maximum allowed latency: 2000000000 usec
 188 // states:
 189 //     C1:                  type[C1] promotion[--] demotion[--] latency[001] usage[00006173] duration[00000000000000000000]
 190 //     C2:                  type[C2] promotion[--] demotion[--] latency[001] usage[00085191] duration[00000000000083024907]
 191 //     C3:                  type[C3] promotion[--] demotion[--] latency[017] usage[01017622] duration[00000000017921327182]
 192                 level = 0;
 193                 while (fgets(buf, sizeof(buf), fp)) {
 194                         char *p = strstr(buf, "age[");
 195                         if (!p)
 196                                 continue;
 197                         p += 4;
 198                         usage[level] += bb_strtoull(p, NULL, 10) + 1;
 199                         p = strstr(buf, "ation[");
 200                         if (!p)
 201                                 continue;
 202                         p += 6;
 203                         duration[level] += bb_strtoull(p, NULL, 10);
 204
 205                         if (level >= MAX_CSTATE_COUNT-1)
 206                                 break;
 207                         level++;
 208                         if (level > G.maxcstate)  /* update maxcstate */
 209                                 G.maxcstate = level;
 210                 }
 211                 fclose(fp);
 212         }
 213         closedir(dir);
 214 }
 215
 216 /* Add line and/or update count */
 217 static void save_line(const char *string, int count)
 218 {
 219         int i;
 220         for (i = 0; i < G.lines_cnt; i++) {
 221                 if (strcmp(string, G.lines[i].string) == 0) {
 222                         /* It's already there, only update count */
 223                         G.lines[i].count += count;
 224                         return;
 225                 }
 226         }
 227
 228         /* Add new line */
 229         G.lines = xrealloc_vector(G.lines, 4, G.lines_cnt);
 230         G.lines[G.lines_cnt].string = xstrdup(string);
 231         G.lines[G.lines_cnt].count = count;
 232         /*G.lines[G.lines_cnt].disk_count = 0;*/
 233         G.lines_cnt++;
 234 }
 235
 236 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 237 static int is_hpet_irq(const char *name)
 238 {
 239         char *p;
 240 # if BLOATY_HPET_IRQ_NUM_DETECTION
 241         long hpet_chan;
 242
 243         /* Learn the range of existing hpet timers. This is done once */
 244         if (!G.scanned_timer_list) {
 245                 FILE *fp;
 246                 char buf[80];
 247
 248                 G.scanned_timer_list = true;
 249                 fp = fopen_for_read("/proc/timer_list");
 250                 if (!fp)
 251                         return 0;
 252
 253                 while (fgets(buf, sizeof(buf), fp)) {
 254                         p = strstr(buf, "Clock Event Device: hpet");
 255                         if (!p)
 256                                 continue;
 257                         p += sizeof("Clock Event Device: hpet")-1;
 258                         if (!isdigit(*p))
 259                                 continue;
 260                         hpet_chan = xatoi_positive(p);
 261                         if (hpet_chan < G.percpu_hpet_start)
 262                                 G.percpu_hpet_start = hpet_chan;
 263                         if (hpet_chan > G.percpu_hpet_end)
 264                                 G.percpu_hpet_end = hpet_chan;
 265                 }
 266                 fclose(fp);
 267         }
 268 # endif
 269 //TODO: optimize
 270         p = strstr(name, "hpet");
 271         if (!p)
 272                 return 0;
 273         p += 4;
 274         if (!isdigit(*p))
 275                 return 0;
 276 # if BLOATY_HPET_IRQ_NUM_DETECTION
 277         hpet_chan = xatoi_positive(p);
 278         if (hpet_chan < G.percpu_hpet_start || hpet_chan > G.percpu_hpet_end)
 279                 return 0;
 280 # endif
 281         return 1;
 282 }
 283
 284 /* Save new IRQ count, return delta from old one */
 285 static int save_irq_count(int irq, ullong count)
 286 {
 287         int unused = IRQCOUNT;
 288         int i;
 289         for (i = 0; i < IRQCOUNT; i++) {
 290                 if (G.interrupts[i].active && G.interrupts[i].number == irq) {
 291                         ullong old = G.interrupts[i].count;
 292                         G.interrupts[i].count = count;
 293                         return count - old;
 294                 }
 295                 if (!G.interrupts[i].active && unused > i)
 296                         unused = i;
 297         }
 298         if (unused < IRQCOUNT) {
 299                 G.interrupts[unused].active = 1;
 300                 G.interrupts[unused].count = count;
 301                 G.interrupts[unused].number = irq;
 302         }
 303         return count;
 304 }
 305
 306 /* Read /proc/interrupts, save IRQ counts and IRQ description */
 307 static void process_irq_counts(void)
 308 {
 309         FILE *fp;
 310         char buf[128];
 311
 312         /* Reset values */
 313         G.interrupt_0 = 0;
 314         G.total_interrupt = 0;
 315
 316         fp = xfopen_for_read("/proc/interrupts");
 317         while (fgets(buf, sizeof(buf), fp)) {
 318                 char irq_desc[sizeof("   <kernel IPI> : ") + sizeof(buf)];
 319                 char *p;
 320                 const char *name;
 321                 int nr;
 322                 ullong count;
 323                 ullong delta;
 324
 325                 p = strchr(buf, ':');
 326                 if (!p)
 327                         continue;
 328                 /*  0:  143646045  153901007   IO-APIC-edge      timer
 329                  *   ^
 330                  */
 331                 *p = '\0';
 332                 /* Deal with non-maskable interrupts -- make up fake numbers */
 333                 nr = index_in_strings("NMI\0RES\0CAL\0TLB\0TRM\0THR\0SPU\0", buf);
 334                 if (nr >= 0) {
 335                         nr += 20000;
 336                 } else {
 337                         /* bb_strtou doesn't eat leading spaces, using strtoul */
 338                         errno = 0;
 339                         nr = strtoul(buf, NULL, 10);
 340                         if (errno)
 341                                 continue;
 342                 }
 343                 p++;
 344                 /*  0:  143646045  153901007   IO-APIC-edge      timer
 345                  *    ^
 346                  */
 347                 /* Sum counts for this IRQ */
 348                 count = 0;
 349                 while (1) {
 350                         char *tmp;
 351                         p = skip_whitespace(p);
 352                         if (!isdigit(*p))
 353                                 break;
 354                         count += bb_strtoull(p, &tmp, 10);
 355                         p = tmp;
 356                 }
 357                 /*   0:  143646045  153901007   IO-APIC-edge      timer
 358                  * NMI:          1          2   Non-maskable interrupts
 359                  *                              ^
 360                  */
 361                 if (nr < 20000) {
 362                         /* Skip to the interrupt name, e.g. 'timer' */
 363                         p = strchr(p, ' ');
 364                         if (!p)
 365                                 continue;
 366                         p = skip_whitespace(p);
 367                 }
 368
 369                 name = p;
 370                 chomp(p);
 371                 /* Save description of the interrupt */
 372                 if (nr >= 20000)
 373                         sprintf(irq_desc, "   <kernel IPI> : %s", name);
 374                 else
 375                         sprintf(irq_desc, "    <interrupt> : %s", name);
 376
 377                 delta = save_irq_count(nr, count);
 378
 379                 /* Skip per CPU timer interrupts */
 380                 if (is_hpet_irq(name))
 381                         continue;
 382
 383                 if (nr != 0 && delta != 0)
 384                         save_line(irq_desc, delta);
 385
 386                 if (nr == 0)
 387                         G.interrupt_0 = delta;
 388                 else
 389                         G.total_interrupt += delta;
 390         }
 391
 392         fclose(fp);
 393 }
 394 #else /* !ENABLE_FEATURE_POWERTOP_PROCIRQ */
 395 # define process_irq_counts()  ((void)0)
 396 #endif
 397
 398 static NOINLINE int process_timer_stats(void)
 399 {
 400         char buf[128];
 401         char line[15 + 3 + 128];
 402         int n;
 403         FILE *fp;
 404
 405         buf[0] = '\0';
 406
 407         n = 0;
 408         fp = NULL;
 409         if (!G.cant_enable_timer_stats)
 410                 fp = fopen_for_read("/proc/timer_stats");
 411         if (fp) {
 412 // Example file contents:
 413 // Timer Stats Version: v0.2
 414 // Sample period: 1.329 s
 415 //    76,     0 swapper          hrtimer_start_range_ns (tick_sched_timer)
 416 //    88,     0 swapper          hrtimer_start_range_ns (tick_sched_timer)
 417 //    24,  3787 firefox          hrtimer_start_range_ns (hrtimer_wakeup)
 418 //   46D,  1136 kondemand/1      do_dbs_timer (delayed_work_timer_fn)
 419 // ...
 420 //     1,  1656 Xorg             hrtimer_start_range_ns (hrtimer_wakeup)
 421 //     1,  2159 udisks-daemon    hrtimer_start_range_ns (hrtimer_wakeup)
 422 // 331 total events, 249.059 events/sec
 423                 while (fgets(buf, sizeof(buf), fp)) {
 424                         const char *count, *process, *func;
 425                         char *p;
 426                         int idx;
 427                         unsigned cnt;
 428
 429                         count = skip_whitespace(buf);
 430                         p = strchr(count, ',');
 431                         if (!p)
 432                                 continue;
 433                         *p++ = '\0';
 434                         cnt = bb_strtou(count, NULL, 10);
 435                         if (strcmp(skip_non_whitespace(count), " total events") == 0) {
 436 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 437                                 n = cnt / G.total_cpus;
 438                                 if (n > 0 && n < G.interrupt_0) {
 439                                         sprintf(line, "    <interrupt> : %s", "extra timer interrupt");
 440                                         save_line(line, G.interrupt_0 - n);
 441                                 }
 442 #endif
 443                                 break;
 444                         }
 445                         if (strchr(count, 'D'))
 446                                 continue; /* deferred */
 447                         p = skip_whitespace(p); /* points to pid now */
 448                         process = NULL;
 449  get_func_name:
 450                         p = strchr(p, ' ');
 451                         if (!p)
 452                                 continue;
 453                         *p++ = '\0';
 454                         p = skip_whitespace(p);
 455                         if (process == NULL) {
 456                                 process = p;
 457                                 goto get_func_name;
 458                         }
 459                         func = p;
 460
 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 (is_prefixed_with(func, "tick_nohz_"))
 469                                 continue;
 470                         if (is_prefixed_with(func, "tick_setup_sched_timer"))
 471                                 continue;
 472                         //if (strcmp(process, "powertop") == 0)
 473                         //      continue;
 474
 475                         idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
 476                         if (idx != -1) {
 477                                 process = idx < 2 ? "[kernel module]" : "<kernel core>";
 478                         }
 479
 480                         chomp(p);
 481
 482                         // 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
 483                         // ^          ^            ^
 484                         // count      process      func
 485
 486                         //if (strchr(process, '['))
 487                                 sprintf(line, "%15.15s : %s", process, func);
 488                         //else
 489                         //      sprintf(line, "%s", process);
 490                         save_line(line, cnt);
 491                 }
 492                 fclose(fp);
 493         }
 494
 495         return n;
 496 }
 497
 498 #ifdef __i386__
 499 /*
 500  * Get information about CPU using CPUID opcode.
 501  */
 502 static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
 503                                 unsigned int *edx)
 504 {
 505         /* EAX value specifies what information to return */
 506         __asm__(
 507                 "       pushl %%ebx\n"     /* Save EBX */
 508                 "       cpuid\n"
 509                 "       movl %%ebx, %1\n"  /* Save content of EBX */
 510                 "       popl %%ebx\n"      /* Restore EBX */
 511                 : "=a"(*eax), /* Output */
 512                   "=r"(*ebx),
 513                   "=c"(*ecx),
 514                   "=d"(*edx)
 515                 : "0"(*eax),  /* Input */
 516                   "1"(*ebx),
 517                   "2"(*ecx),
 518                   "3"(*edx)
 519                 /* No clobbered registers */
 520         );
 521 }
 522 #endif
 523
 524 #ifdef __i386__
 525 static NOINLINE void print_intel_cstates(void)
 526 {
 527         int bios_table[8] = { 0 };
 528         int nbios = 0;
 529         DIR *cpudir;
 530         struct dirent *d;
 531         int i;
 532         unsigned eax, ebx, ecx, edx;
 533
 534         cpudir = opendir("/sys/devices/system/cpu");
 535         if (!cpudir)
 536                 return;
 537
 538         /* Loop over cpuN entries */
 539         while ((d = readdir(cpudir)) != NULL) {
 540                 DIR *dir;
 541                 int len;
 542                 char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
 543
 544                 len = strlen(d->d_name);
 545                 if (len < 3 || len > BIG_SYSNAME_LEN)
 546                         continue;
 547
 548                 if (!isdigit(d->d_name[3]))
 549                         continue;
 550
 551                 len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
 552                 dir = opendir(fname);
 553                 if (!dir)
 554                         continue;
 555
 556                 /*
 557                  * Every C-state has its own stateN directory, that
 558                  * contains a 'time' and a 'usage' file.
 559                  */
 560                 while ((d = readdir(dir)) != NULL) {
 561                         FILE *fp;
 562                         char buf[64];
 563                         int n;
 564
 565                         n = strlen(d->d_name);
 566                         if (n < 3 || n > BIG_SYSNAME_LEN)
 567                                 continue;
 568
 569                         sprintf(fname + len, "/%s/desc", d->d_name);
 570                         fp = fopen_for_read(fname);
 571                         if (fp) {
 572                                 char *p = fgets(buf, sizeof(buf), fp);
 573                                 fclose(fp);
 574                                 if (!p)
 575                                         break;
 576                                 p = strstr(p, "MWAIT ");
 577                                 if (p) {
 578                                         int pos;
 579                                         p += sizeof("MWAIT ") - 1;
 580                                         pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
 581                                         if (pos >= ARRAY_SIZE(bios_table))
 582                                                 continue;
 583                                         bios_table[pos]++;
 584                                         nbios++;
 585                                 }
 586                         }
 587                 }
 588                 closedir(dir);
 589         }
 590         closedir(cpudir);
 591
 592         if (!nbios)
 593                 return;
 594
 595         eax = 5;
 596         ebx = ecx = edx = 0;
 597         cpuid(&eax, &ebx, &ecx, &edx);
 598         if (!edx || !(ecx & 1))
 599                 return;
 600
 601         printf("Your %s the following C-states: ", "CPU supports");
 602         i = 0;
 603         while (edx) {
 604                 if (edx & 7)
 605                         printf("C%u ", i);
 606                 edx >>= 4;
 607                 i++;
 608         }
 609         bb_putchar('\n');
 610
 611         /* Print BIOS C-States */
 612         printf("Your %s the following C-states: ", "BIOS reports");
 613         for (i = 0; i < ARRAY_SIZE(bios_table); i++)
 614                 if (bios_table[i])
 615                         printf("C%u ", i);
 616
 617         bb_putchar('\n');
 618 }
 619 #else
 620 # define print_intel_cstates() ((void)0)
 621 #endif
 622
 623 static void show_timerstats(void)
 624 {
 625         unsigned lines;
 626
 627         /* Get terminal height */
 628         get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
 629
 630         /* We don't have whole terminal just for timerstats */
 631         lines -= 12;
 632
 633         if (!G.cant_enable_timer_stats) {
 634                 int i, n = 0;
 635                 char strbuf6[6];
 636
 637                 puts("\nTop causes for wakeups:");
 638                 for (i = 0; i < G.lines_cnt; i++) {
 639                         if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
 640                          && n++ < lines
 641                         ) {
 642                                 /* NB: upstream powertop prints "(wakeups/sec)",
 643                                  * we print just "(wakeup counts)".
 644                                  */
 645                                 /*char c = ' ';
 646                                 if (G.lines[i].disk_count)
 647                                         c = 'D';*/
 648                                 smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY")[0] = '\0';
 649                                 printf(/*" %5.1f%% (%s)%c  %s\n"*/
 650                                         " %5.1f%% (%s)   %s\n",
 651                                         G.lines[i].count * 100.0 / G.lines_cumulative_count,
 652                                         strbuf6, /*c,*/
 653                                         G.lines[i].string);
 654                         }
 655                 }
 656         } else {
 657                 bb_putchar('\n');
 658                 bb_error_msg("no stats available; run as root or"
 659                                 " enable the timer_stats module");
 660         }
 661 }
 662
 663 // Example display from powertop version 1.11
 664 // Cn                Avg residency       P-states (frequencies)
 665 // C0 (cpu running)        ( 0.5%)         2.00 Ghz     0.0%
 666 // polling           0.0ms ( 0.0%)         1.67 Ghz     0.0%
 667 // C1 mwait          0.0ms ( 0.0%)         1333 Mhz     0.1%
 668 // C2 mwait          0.1ms ( 0.1%)         1000 Mhz    99.9%
 669 // C3 mwait         12.1ms (99.4%)
 670 //
 671 // Wakeups-from-idle per second : 93.6     interval: 15.0s
 672 // no ACPI power usage estimate available
 673 //
 674 // Top causes for wakeups:
 675 //   32.4% ( 26.7)       <interrupt> : extra timer interrupt
 676 //   29.0% ( 23.9)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
 677 //    9.0% (  7.5)     <kernel core> : hrtimer_start (tick_sched_timer)
 678 //    6.5% (  5.3)       <interrupt> : ata_piix
 679 //    5.0% (  4.1)             inetd : hrtimer_start_range_ns (hrtimer_wakeup)
 680
 681 //usage:#define powertop_trivial_usage
 682 //usage:       ""
 683 //usage:#define powertop_full_usage "\n\n"
 684 //usage:       "Analyze power consumption on Intel-based laptops"
 685
 686 int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 687 int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
 688 {
 689         ullong cur_usage[MAX_CSTATE_COUNT];
 690         ullong cur_duration[MAX_CSTATE_COUNT];
 691         char cstate_lines[MAX_CSTATE_COUNT + 2][64];
 692 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
 693         struct pollfd pfd[1];
 694
 695         pfd[0].fd = 0;
 696         pfd[0].events = POLLIN;
 697 #endif
 698
 699         INIT_G();
 700
 701 #if ENABLE_FEATURE_POWERTOP_PROCIRQ && BLOATY_HPET_IRQ_NUM_DETECTION
 702         G.percpu_hpet_start = INT_MAX;
 703         G.percpu_hpet_end = INT_MIN;
 704 #endif
 705
 706         /* Print warning when we don't have superuser privileges */
 707         if (geteuid() != 0)
 708                 bb_error_msg("run as root to collect enough information");
 709
 710         /* Get number of CPUs */
 711         G.total_cpus = get_cpu_count();
 712
 713         puts("Collecting data for "DEFAULT_SLEEP_STR" seconds");
 714
 715 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
 716         /* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
 717         set_termios_to_raw(STDIN_FILENO, &G.init_settings, TERMIOS_CLEAR_ISIG);
 718         bb_signals(BB_FATAL_SIGS, sig_handler);
 719         /* So we don't forget to reset term settings */
 720         die_func = reset_term;
 721 #endif
 722
 723         /* Collect initial data */
 724         process_irq_counts();
 725
 726         /* Read initial usage and duration */
 727         read_cstate_counts(G.start_usage, G.start_duration);
 728
 729         /* Copy them to "last" */
 730         memcpy(G.last_usage, G.start_usage, sizeof(G.last_usage));
 731         memcpy(G.last_duration, G.start_duration, sizeof(G.last_duration));
 732
 733         /* Display C-states */
 734         print_intel_cstates();
 735
 736         G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
 737
 738         /* The main loop */
 739         for (;;) {
 740                 //double maxsleep = 0.0;
 741                 ullong totalticks, totalevents;
 742                 int i;
 743
 744                 G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
 745 #if !ENABLE_FEATURE_POWERTOP_INTERACTIVE
 746                 sleep(DEFAULT_SLEEP);
 747 #else
 748                 if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
 749                         unsigned char c;
 750                         if (safe_read(STDIN_FILENO, &c, 1) != 1)
 751                                 break; /* EOF/error */
 752                         if (c == G.init_settings.c_cc[VINTR])
 753                                 break; /* ^C */
 754                         if ((c | 0x20) == 'q')
 755                                 break;
 756                 }
 757 #endif
 758                 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
 759
 760                 clear_lines();
 761                 process_irq_counts();
 762
 763                 /* Clear the stats */
 764                 memset(cur_duration, 0, sizeof(cur_duration));
 765                 memset(cur_usage, 0, sizeof(cur_usage));
 766
 767                 /* Read them */
 768                 read_cstate_counts(cur_usage, cur_duration);
 769
 770                 /* Count totalticks and totalevents */
 771                 totalticks = totalevents = 0;
 772                 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
 773                         if (cur_usage[i] != 0) {
 774                                 totalticks += cur_duration[i] - G.last_duration[i];
 775                                 totalevents += cur_usage[i] - G.last_usage[i];
 776                         }
 777                 }
 778
 779                 /* Clear the screen */
 780                 printf("\033[H\033[J");
 781
 782                 /* Clear C-state lines */
 783                 memset(&cstate_lines, 0, sizeof(cstate_lines));
 784
 785                 if (totalevents == 0 && G.maxcstate <= 1) {
 786                         /* This should not happen */
 787                         strcpy(cstate_lines[0], "C-state information is not available\n");
 788                 } else {
 789                         double percentage;
 790                         unsigned newticks;
 791
 792                         newticks = G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000 - totalticks;
 793                         /* Handle rounding errors: do not display negative values */
 794                         if ((int)newticks < 0)
 795                                 newticks = 0;
 796
 797                         sprintf(cstate_lines[0], "Cn\t\t  Avg residency\n");
 798                         percentage = newticks * 100.0 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
 799                         sprintf(cstate_lines[1], "C0 (cpu running)        (%4.1f%%)\n", percentage);
 800
 801                         /* Compute values for individual C-states */
 802                         for (i = 0; i < MAX_CSTATE_COUNT; i++) {
 803                                 if (cur_usage[i] != 0) {
 804                                         double slept;
 805                                         slept = (cur_duration[i] - G.last_duration[i])
 806                                                 / (cur_usage[i] - G.last_usage[i] + 0.1) / FREQ_ACPI;
 807                                         percentage = (cur_duration[i] - G.last_duration[i]) * 100
 808                                                 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
 809                                         sprintf(cstate_lines[i + 2], "C%u\t\t%5.1fms (%4.1f%%)\n",
 810                                                 i + 1, slept, percentage);
 811                                         //if (maxsleep < slept)
 812                                         //      maxsleep = slept;
 813                                 }
 814                         }
 815                 }
 816
 817                 for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
 818                         if (cstate_lines[i][0])
 819                                 fputs(cstate_lines[i], stdout);
 820
 821                 i = process_timer_stats();
 822 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
 823                 if (totalevents == 0) {
 824                         /* No C-state info available, use timerstats */
 825                         totalevents = i * G.total_cpus + G.total_interrupt;
 826                         if (i < 0)
 827                                 totalevents += G.interrupt_0 - i;
 828                 }
 829 #endif
 830                 /* Upstream powertop prints wakeups per sec per CPU,
 831                  * we print just raw wakeup counts.
 832                  */
 833 //TODO: show real seconds (think about manual refresh)
 834                 printf("\nWakeups-from-idle in %u seconds: %llu\n",
 835                         DEFAULT_SLEEP,
 836                         totalevents
 837                 );
 838
 839                 update_lines_cumulative_count();
 840                 sort_lines();
 841                 show_timerstats();
 842                 fflush(stdout);
 843
 844                 /* Clear the stats */
 845                 memset(cur_duration, 0, sizeof(cur_duration));
 846                 memset(cur_usage, 0, sizeof(cur_usage));
 847
 848                 /* Get new values */
 849                 read_cstate_counts(cur_usage, cur_duration);
 850
 851                 /* Save them */
 852                 memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
 853                 memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));
 854         } /* for (;;) */
 855
 856         bb_putchar('\n');
 857 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
 858         reset_term();
 859 #endif
 860
 861         return EXIT_SUCCESS;
 862 }