1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004 Colin Percival 5 * Copyright (c) 2005 Nate Lawson 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted providing that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 #include <sys/param.h> 32 #include <sys/ioctl.h> 33 #include <sys/sysctl.h> 34 #include <sys/resource.h> 35 #include <sys/socket.h> 36 #include <sys/time.h> 37 #include <sys/un.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <libutil.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <sysexits.h> 48 #include <unistd.h> 49 50 #ifdef __i386__ 51 #define USE_APM 52 #endif 53 54 #ifdef USE_APM 55 #include <machine/apm_bios.h> 56 #endif 57 58 #define DEFAULT_ACTIVE_PERCENT 75 59 #define DEFAULT_IDLE_PERCENT 50 60 #define DEFAULT_POLL_INTERVAL 250 /* Poll interval in milliseconds */ 61 62 typedef enum { 63 MODE_MIN, 64 MODE_ADAPTIVE, 65 MODE_HIADAPTIVE, 66 MODE_MAX, 67 } modes_t; 68 69 typedef enum { 70 SRC_AC, 71 SRC_BATTERY, 72 SRC_UNKNOWN, 73 } power_src_t; 74 75 static const char *modes[] = { 76 "AC", 77 "battery", 78 "unknown" 79 }; 80 81 #define ACPIAC "hw.acpi.acline" 82 #define PMUAC "dev.pmu.0.acline" 83 #define APMDEV "/dev/apm" 84 #define DEVDPIPE "/var/run/devd.pipe" 85 #define DEVCTL_MAXBUF 1024 86 87 static int read_usage_times(int *load, int nonice); 88 static int read_freqs(int *numfreqs, int **freqs, int **power, 89 int minfreq, int maxfreq); 90 static int set_freq(int freq); 91 static void acline_init(void); 92 static void acline_read(void); 93 static int devd_init(void); 94 static void devd_close(void); 95 static void handle_sigs(int sig); 96 static void parse_mode(char *arg, int *mode, int ch); 97 static void usage(void); 98 99 /* Sysctl data structures. */ 100 static int cp_times_mib[2]; 101 static int freq_mib[4]; 102 static int levels_mib[4]; 103 static int acline_mib[4]; 104 static size_t acline_mib_len; 105 106 /* Configuration */ 107 static int cpu_running_mark; 108 static int cpu_idle_mark; 109 static int poll_ival; 110 static int vflag; 111 112 static volatile sig_atomic_t exit_requested; 113 static power_src_t acline_status; 114 typedef enum { 115 ac_none, 116 ac_sysctl, 117 ac_acpi_devd, 118 #ifdef USE_APM 119 ac_apm, 120 #endif 121 } acline_mode_t; 122 static acline_mode_t acline_mode; 123 static acline_mode_t acline_mode_user = ac_none; 124 #ifdef USE_APM 125 static int apm_fd = -1; 126 #endif 127 static int devd_pipe = -1; 128 129 #define DEVD_RETRY_INTERVAL 60 /* seconds */ 130 static struct timeval tried_devd; 131 132 /* 133 * This function returns summary load of all CPUs. It was made so 134 * intentionally to not reduce performance in scenarios when several 135 * threads are processing requests as a pipeline -- running one at 136 * a time on different CPUs and waiting for each other. If nonice 137 * is nonzero, only user+sys+intr time will be counted as load; any 138 * nice time will be treated as if idle. 139 */ 140 static int 141 read_usage_times(int *load, int nonice) 142 { 143 static long *cp_times = NULL, *cp_times_old = NULL; 144 static int ncpus = 0; 145 size_t cp_times_len; 146 int error, cpu, i, total, excl; 147 148 if (cp_times == NULL) { 149 cp_times_len = 0; 150 error = sysctl(cp_times_mib, 2, NULL, &cp_times_len, NULL, 0); 151 if (error) 152 return (error); 153 if ((cp_times = malloc(cp_times_len)) == NULL) 154 return (errno); 155 if ((cp_times_old = malloc(cp_times_len)) == NULL) { 156 free(cp_times); 157 cp_times = NULL; 158 return (errno); 159 } 160 ncpus = cp_times_len / (sizeof(long) * CPUSTATES); 161 } 162 163 cp_times_len = sizeof(long) * CPUSTATES * ncpus; 164 error = sysctl(cp_times_mib, 2, cp_times, &cp_times_len, NULL, 0); 165 if (error) 166 return (error); 167 168 if (load) { 169 *load = 0; 170 for (cpu = 0; cpu < ncpus; cpu++) { 171 total = 0; 172 for (i = 0; i < CPUSTATES; i++) { 173 total += cp_times[cpu * CPUSTATES + i] - 174 cp_times_old[cpu * CPUSTATES + i]; 175 } 176 if (total == 0) 177 continue; 178 excl = cp_times[cpu * CPUSTATES + CP_IDLE] - 179 cp_times_old[cpu * CPUSTATES + CP_IDLE]; 180 if (nonice) 181 excl += cp_times[cpu * CPUSTATES + CP_NICE] - 182 cp_times_old[cpu * CPUSTATES + CP_NICE]; 183 *load += 100 - excl * 100 / total; 184 } 185 } 186 187 memcpy(cp_times_old, cp_times, cp_times_len); 188 189 return (0); 190 } 191 192 static int 193 read_freqs(int *numfreqs, int **freqs, int **power, int minfreq, int maxfreq) 194 { 195 char *freqstr, *p, *q; 196 int i, j; 197 size_t len = 0; 198 199 if (sysctl(levels_mib, 4, NULL, &len, NULL, 0)) 200 return (-1); 201 if ((freqstr = malloc(len)) == NULL) 202 return (-1); 203 if (sysctl(levels_mib, 4, freqstr, &len, NULL, 0)) { 204 free(freqstr); 205 return (-1); 206 } 207 208 *numfreqs = 1; 209 for (p = freqstr; *p != '\0'; p++) 210 if (*p == ' ') 211 (*numfreqs)++; 212 213 if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) { 214 free(freqstr); 215 return (-1); 216 } 217 if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) { 218 free(freqstr); 219 free(*freqs); 220 return (-1); 221 } 222 for (i = 0, j = 0, p = freqstr; i < *numfreqs; i++) { 223 q = strchr(p, ' '); 224 if (q != NULL) 225 *q = '\0'; 226 if (sscanf(p, "%d/%d", &(*freqs)[j], &(*power)[i]) != 2) { 227 free(freqstr); 228 free(*freqs); 229 free(*power); 230 return (-1); 231 } 232 if (((*freqs)[j] >= minfreq || minfreq == -1) && 233 ((*freqs)[j] <= maxfreq || maxfreq == -1)) 234 j++; 235 p = q + 1; 236 } 237 238 *numfreqs = j; 239 if ((*freqs = realloc(*freqs, *numfreqs * sizeof(int))) == NULL) { 240 free(freqstr); 241 free(*freqs); 242 free(*power); 243 return (-1); 244 } 245 246 free(freqstr); 247 return (0); 248 } 249 250 static int 251 get_freq(void) 252 { 253 size_t len; 254 int curfreq; 255 256 len = sizeof(curfreq); 257 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) { 258 if (vflag) 259 warn("error reading current CPU frequency"); 260 curfreq = 0; 261 } 262 return (curfreq); 263 } 264 265 static int 266 set_freq(int freq) 267 { 268 269 if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq))) { 270 if (errno != EPERM) 271 return (-1); 272 } 273 274 return (0); 275 } 276 277 static int 278 get_freq_id(int freq, int *freqs, int numfreqs) 279 { 280 int i = 1; 281 282 while (i < numfreqs) { 283 if (freqs[i] < freq) 284 break; 285 i++; 286 } 287 return (i - 1); 288 } 289 290 /* 291 * Try to use ACPI to find the AC line status. If this fails, fall back 292 * to APM. If nothing succeeds, we'll just run in default mode. 293 */ 294 static void 295 acline_init(void) 296 { 297 int skip_source_check; 298 299 acline_mib_len = 4; 300 acline_status = SRC_UNKNOWN; 301 skip_source_check = (acline_mode_user == ac_none || 302 acline_mode_user == ac_acpi_devd); 303 304 if ((skip_source_check || acline_mode_user == ac_sysctl) && 305 sysctlnametomib(ACPIAC, acline_mib, &acline_mib_len) == 0) { 306 acline_mode = ac_sysctl; 307 if (vflag) 308 warnx("using sysctl for AC line status"); 309 #ifdef __powerpc__ 310 } else if ((skip_source_check || acline_mode_user == ac_sysctl) && 311 sysctlnametomib(PMUAC, acline_mib, &acline_mib_len) == 0) { 312 acline_mode = ac_sysctl; 313 if (vflag) 314 warnx("using sysctl for AC line status"); 315 #endif 316 #ifdef USE_APM 317 } else if ((skip_source_check || acline_mode_user == ac_apm) && 318 (apm_fd = open(APMDEV, O_RDONLY)) >= 0) { 319 if (vflag) 320 warnx("using APM for AC line status"); 321 acline_mode = ac_apm; 322 #endif 323 } else { 324 warnx("unable to determine AC line status"); 325 acline_mode = ac_none; 326 } 327 } 328 329 static void 330 acline_read(void) 331 { 332 if (acline_mode == ac_acpi_devd) { 333 char buf[DEVCTL_MAXBUF], *ptr; 334 ssize_t rlen; 335 int notify; 336 337 rlen = read(devd_pipe, buf, sizeof(buf)); 338 if (rlen == 0 || (rlen < 0 && errno != EWOULDBLOCK)) { 339 if (vflag) 340 warnx("lost devd connection, switching to sysctl"); 341 devd_close(); 342 acline_mode = ac_sysctl; 343 /* FALLTHROUGH */ 344 } 345 if (rlen > 0 && 346 (ptr = strstr(buf, "system=ACPI")) != NULL && 347 (ptr = strstr(ptr, "subsystem=ACAD")) != NULL && 348 (ptr = strstr(ptr, "notify=")) != NULL && 349 sscanf(ptr, "notify=%x", ¬ify) == 1) 350 acline_status = (notify ? SRC_AC : SRC_BATTERY); 351 } 352 if (acline_mode == ac_sysctl) { 353 int acline; 354 size_t len; 355 356 len = sizeof(acline); 357 if (sysctl(acline_mib, acline_mib_len, &acline, &len, 358 NULL, 0) == 0) 359 acline_status = (acline ? SRC_AC : SRC_BATTERY); 360 else 361 acline_status = SRC_UNKNOWN; 362 } 363 #ifdef USE_APM 364 if (acline_mode == ac_apm) { 365 struct apm_info info; 366 367 if (ioctl(apm_fd, APMIO_GETINFO, &info) == 0) { 368 acline_status = (info.ai_acline ? SRC_AC : SRC_BATTERY); 369 } else { 370 close(apm_fd); 371 apm_fd = -1; 372 acline_mode = ac_none; 373 acline_status = SRC_UNKNOWN; 374 } 375 } 376 #endif 377 /* try to (re)connect to devd */ 378 #ifdef USE_APM 379 if ((acline_mode == ac_sysctl && 380 (acline_mode_user == ac_none || 381 acline_mode_user == ac_acpi_devd)) || 382 (acline_mode == ac_apm && 383 acline_mode_user == ac_acpi_devd)) { 384 #else 385 if (acline_mode == ac_sysctl && 386 (acline_mode_user == ac_none || 387 acline_mode_user == ac_acpi_devd)) { 388 #endif 389 struct timeval now; 390 391 gettimeofday(&now, NULL); 392 if (now.tv_sec > tried_devd.tv_sec + DEVD_RETRY_INTERVAL) { 393 if (devd_init() >= 0) { 394 if (vflag) 395 warnx("using devd for AC line status"); 396 acline_mode = ac_acpi_devd; 397 } 398 tried_devd = now; 399 } 400 } 401 } 402 403 static int 404 devd_init(void) 405 { 406 struct sockaddr_un devd_addr; 407 408 bzero(&devd_addr, sizeof(devd_addr)); 409 if ((devd_pipe = socket(PF_LOCAL, SOCK_STREAM|SOCK_NONBLOCK, 0)) < 0) { 410 if (vflag) 411 warn("%s(): socket()", __func__); 412 return (-1); 413 } 414 415 devd_addr.sun_family = PF_LOCAL; 416 strlcpy(devd_addr.sun_path, DEVDPIPE, sizeof(devd_addr.sun_path)); 417 if (connect(devd_pipe, (struct sockaddr *)&devd_addr, 418 sizeof(devd_addr)) == -1) { 419 if (vflag) 420 warn("%s(): connect()", __func__); 421 close(devd_pipe); 422 devd_pipe = -1; 423 return (-1); 424 } 425 426 return (devd_pipe); 427 } 428 429 static void 430 devd_close(void) 431 { 432 433 close(devd_pipe); 434 devd_pipe = -1; 435 } 436 437 static void 438 parse_mode(char *arg, int *mode, int ch) 439 { 440 441 if (strcmp(arg, "minimum") == 0 || strcmp(arg, "min") == 0) 442 *mode = MODE_MIN; 443 else if (strcmp(arg, "maximum") == 0 || strcmp(arg, "max") == 0) 444 *mode = MODE_MAX; 445 else if (strcmp(arg, "adaptive") == 0 || strcmp(arg, "adp") == 0) 446 *mode = MODE_ADAPTIVE; 447 else if (strcmp(arg, "hiadaptive") == 0 || strcmp(arg, "hadp") == 0) 448 *mode = MODE_HIADAPTIVE; 449 else 450 errx(1, "bad option: -%c %s", (char)ch, optarg); 451 } 452 453 static void 454 parse_acline_mode(char *arg, int ch) 455 { 456 if (strcmp(arg, "sysctl") == 0) 457 acline_mode_user = ac_sysctl; 458 else if (strcmp(arg, "devd") == 0) 459 acline_mode_user = ac_acpi_devd; 460 #ifdef USE_APM 461 else if (strcmp(arg, "apm") == 0) 462 acline_mode_user = ac_apm; 463 #endif 464 else 465 errx(1, "bad option: -%c %s", (char)ch, optarg); 466 } 467 468 static void 469 handle_sigs(int __unused sig) 470 { 471 472 exit_requested = 1; 473 } 474 475 static void 476 usage(void) 477 { 478 479 fprintf(stderr, 480 "usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-N] [-n mode] [-p ival] [-r %%] [-s source] [-P pidfile]\n"); 481 exit(1); 482 } 483 484 int 485 main(int argc, char * argv[]) 486 { 487 struct timeval timeout; 488 fd_set fdset; 489 int nfds; 490 struct pidfh *pfh = NULL; 491 const char *pidfile = NULL; 492 int freq, curfreq, initfreq, *freqs, i, j, *mwatts, numfreqs, load; 493 int minfreq = -1, maxfreq = -1; 494 int ch, mode, mode_ac, mode_battery, mode_none, idle, to; 495 uint64_t mjoules_used; 496 size_t len; 497 int nonice; 498 499 /* Default mode for all AC states is adaptive. */ 500 mode_ac = mode_none = MODE_HIADAPTIVE; 501 mode_battery = MODE_ADAPTIVE; 502 cpu_running_mark = DEFAULT_ACTIVE_PERCENT; 503 cpu_idle_mark = DEFAULT_IDLE_PERCENT; 504 poll_ival = DEFAULT_POLL_INTERVAL; 505 mjoules_used = 0; 506 vflag = 0; 507 nonice = 0; 508 509 /* User must be root to control frequencies. */ 510 if (geteuid() != 0) 511 errx(1, "must be root to run"); 512 513 while ((ch = getopt(argc, argv, "a:b:i:m:M:Nn:p:P:r:s:v")) != -1) 514 switch (ch) { 515 case 'a': 516 parse_mode(optarg, &mode_ac, ch); 517 break; 518 case 'b': 519 parse_mode(optarg, &mode_battery, ch); 520 break; 521 case 's': 522 parse_acline_mode(optarg, ch); 523 break; 524 case 'i': 525 cpu_idle_mark = atoi(optarg); 526 if (cpu_idle_mark < 0 || cpu_idle_mark > 100) { 527 warnx("%d is not a valid percent", 528 cpu_idle_mark); 529 usage(); 530 } 531 break; 532 case 'm': 533 minfreq = atoi(optarg); 534 if (minfreq < 0) { 535 warnx("%d is not a valid CPU frequency", 536 minfreq); 537 usage(); 538 } 539 break; 540 case 'M': 541 maxfreq = atoi(optarg); 542 if (maxfreq < 0) { 543 warnx("%d is not a valid CPU frequency", 544 maxfreq); 545 usage(); 546 } 547 break; 548 case 'N': 549 nonice = 1; 550 break; 551 case 'n': 552 parse_mode(optarg, &mode_none, ch); 553 break; 554 case 'p': 555 poll_ival = atoi(optarg); 556 if (poll_ival < 5) { 557 warnx("poll interval is in units of ms"); 558 usage(); 559 } 560 break; 561 case 'P': 562 pidfile = optarg; 563 break; 564 case 'r': 565 cpu_running_mark = atoi(optarg); 566 if (cpu_running_mark <= 0 || cpu_running_mark > 100) { 567 warnx("%d is not a valid percent", 568 cpu_running_mark); 569 usage(); 570 } 571 break; 572 case 'v': 573 vflag = 1; 574 break; 575 default: 576 usage(); 577 } 578 579 mode = mode_none; 580 581 /* Poll interval is in units of ms. */ 582 poll_ival *= 1000; 583 584 /* Look up various sysctl MIBs. */ 585 len = 2; 586 if (sysctlnametomib("kern.cp_times", cp_times_mib, &len)) 587 err(1, "lookup kern.cp_times"); 588 len = 4; 589 if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len)) 590 err(EX_UNAVAILABLE, "no cpufreq(4) support -- aborting"); 591 len = 4; 592 if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len)) 593 err(1, "lookup freq_levels"); 594 595 /* Check if we can read the load and supported freqs. */ 596 if (read_usage_times(NULL, nonice)) 597 err(1, "read_usage_times"); 598 if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq)) 599 err(1, "error reading supported CPU frequencies"); 600 if (numfreqs == 0) 601 errx(1, "no CPU frequencies in user-specified range"); 602 603 /* Run in the background unless in verbose mode. */ 604 if (!vflag) { 605 pid_t otherpid; 606 607 pfh = pidfile_open(pidfile, 0600, &otherpid); 608 if (pfh == NULL) { 609 if (errno == EEXIST) { 610 errx(1, "powerd already running, pid: %d", 611 otherpid); 612 } 613 warn("cannot open pid file"); 614 } 615 if (daemon(0, 0) != 0) { 616 warn("cannot enter daemon mode, exiting"); 617 pidfile_remove(pfh); 618 exit(EXIT_FAILURE); 619 620 } 621 pidfile_write(pfh); 622 } 623 624 /* Decide whether to use ACPI or APM to read the AC line status. */ 625 acline_init(); 626 627 /* 628 * Exit cleanly on signals. 629 */ 630 signal(SIGINT, handle_sigs); 631 signal(SIGTERM, handle_sigs); 632 633 freq = initfreq = curfreq = get_freq(); 634 i = get_freq_id(curfreq, freqs, numfreqs); 635 if (freq < 1) 636 freq = 1; 637 638 /* 639 * If we are in adaptive mode and the current frequency is outside the 640 * user-defined range, adjust it to be within the user-defined range. 641 */ 642 acline_read(); 643 if (acline_status > SRC_UNKNOWN) 644 errx(1, "invalid AC line status %d", acline_status); 645 if ((acline_status == SRC_AC && 646 (mode_ac == MODE_ADAPTIVE || mode_ac == MODE_HIADAPTIVE)) || 647 (acline_status == SRC_BATTERY && 648 (mode_battery == MODE_ADAPTIVE || mode_battery == MODE_HIADAPTIVE)) || 649 (acline_status == SRC_UNKNOWN && 650 (mode_none == MODE_ADAPTIVE || mode_none == MODE_HIADAPTIVE))) { 651 /* Read the current frequency. */ 652 len = sizeof(curfreq); 653 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) { 654 if (vflag) 655 warn("error reading current CPU frequency"); 656 } 657 if (curfreq < freqs[numfreqs - 1]) { 658 if (vflag) { 659 printf("CPU frequency is below user-defined " 660 "minimum; changing frequency to %d " 661 "MHz\n", freqs[numfreqs - 1]); 662 } 663 if (set_freq(freqs[numfreqs - 1]) != 0) { 664 warn("error setting CPU freq %d", 665 freqs[numfreqs - 1]); 666 } 667 } else if (curfreq > freqs[0]) { 668 if (vflag) { 669 printf("CPU frequency is above user-defined " 670 "maximum; changing frequency to %d " 671 "MHz\n", freqs[0]); 672 } 673 if (set_freq(freqs[0]) != 0) { 674 warn("error setting CPU freq %d", 675 freqs[0]); 676 } 677 } 678 } 679 680 idle = 0; 681 /* Main loop. */ 682 for (;;) { 683 FD_ZERO(&fdset); 684 if (devd_pipe >= 0) { 685 FD_SET(devd_pipe, &fdset); 686 nfds = devd_pipe + 1; 687 } else { 688 nfds = 0; 689 } 690 if (mode == MODE_HIADAPTIVE || idle < 120) 691 to = poll_ival; 692 else if (idle < 360) 693 to = poll_ival * 2; 694 else 695 to = poll_ival * 4; 696 timeout.tv_sec = to / 1000000; 697 timeout.tv_usec = to % 1000000; 698 select(nfds, &fdset, NULL, &fdset, &timeout); 699 700 /* If the user requested we quit, print some statistics. */ 701 if (exit_requested) { 702 if (vflag && mjoules_used != 0) 703 printf("total joules used: %u.%03u\n", 704 (u_int)(mjoules_used / 1000), 705 (int)mjoules_used % 1000); 706 break; 707 } 708 709 /* Read the current AC status and record the mode. */ 710 acline_read(); 711 switch (acline_status) { 712 case SRC_AC: 713 mode = mode_ac; 714 break; 715 case SRC_BATTERY: 716 mode = mode_battery; 717 break; 718 case SRC_UNKNOWN: 719 mode = mode_none; 720 break; 721 default: 722 errx(1, "invalid AC line status %d", acline_status); 723 } 724 725 /* Read the current frequency. */ 726 if (idle % 32 == 0) { 727 if ((curfreq = get_freq()) == 0) 728 continue; 729 i = get_freq_id(curfreq, freqs, numfreqs); 730 } 731 idle++; 732 if (vflag) { 733 /* Keep a sum of all power actually used. */ 734 if (mwatts[i] != -1) 735 mjoules_used += 736 (mwatts[i] * (poll_ival / 1000)) / 1000; 737 } 738 739 /* Always switch to the lowest frequency in min mode. */ 740 if (mode == MODE_MIN) { 741 freq = freqs[numfreqs - 1]; 742 if (curfreq != freq) { 743 if (vflag) { 744 printf("now operating on %s power; " 745 "changing frequency to %d MHz\n", 746 modes[acline_status], freq); 747 } 748 idle = 0; 749 if (set_freq(freq) != 0) { 750 warn("error setting CPU freq %d", 751 freq); 752 continue; 753 } 754 } 755 continue; 756 } 757 758 /* Always switch to the highest frequency in max mode. */ 759 if (mode == MODE_MAX) { 760 freq = freqs[0]; 761 if (curfreq != freq) { 762 if (vflag) { 763 printf("now operating on %s power; " 764 "changing frequency to %d MHz\n", 765 modes[acline_status], freq); 766 } 767 idle = 0; 768 if (set_freq(freq) != 0) { 769 warn("error setting CPU freq %d", 770 freq); 771 continue; 772 } 773 } 774 continue; 775 } 776 777 /* Adaptive mode; get the current CPU usage times. */ 778 if (read_usage_times(&load, nonice)) { 779 if (vflag) 780 warn("read_usage_times() failed"); 781 continue; 782 } 783 784 if (mode == MODE_ADAPTIVE) { 785 if (load > cpu_running_mark) { 786 if (load > 95 || load > cpu_running_mark * 2) 787 freq *= 2; 788 else 789 freq = freq * load / cpu_running_mark; 790 if (freq > freqs[0]) 791 freq = freqs[0]; 792 } else if (load < cpu_idle_mark && 793 curfreq * load < freqs[get_freq_id( 794 freq * 7 / 8, freqs, numfreqs)] * 795 cpu_running_mark) { 796 freq = freq * 7 / 8; 797 if (freq < freqs[numfreqs - 1]) 798 freq = freqs[numfreqs - 1]; 799 } 800 } else { /* MODE_HIADAPTIVE */ 801 if (load > cpu_running_mark / 2) { 802 if (load > 95 || load > cpu_running_mark) 803 freq *= 4; 804 else 805 freq = freq * load * 2 / cpu_running_mark; 806 if (freq > freqs[0] * 2) 807 freq = freqs[0] * 2; 808 } else if (load < cpu_idle_mark / 2 && 809 curfreq * load < freqs[get_freq_id( 810 freq * 31 / 32, freqs, numfreqs)] * 811 cpu_running_mark / 2) { 812 freq = freq * 31 / 32; 813 if (freq < freqs[numfreqs - 1]) 814 freq = freqs[numfreqs - 1]; 815 } 816 } 817 if (vflag) { 818 printf("load %3d%%, current freq %4d MHz (%2d), wanted freq %4d MHz\n", 819 load, curfreq, i, freq); 820 } 821 j = get_freq_id(freq, freqs, numfreqs); 822 if (i != j) { 823 if (vflag) { 824 printf("changing clock" 825 " speed from %d MHz to %d MHz\n", 826 freqs[i], freqs[j]); 827 } 828 idle = 0; 829 if (set_freq(freqs[j])) 830 warn("error setting CPU frequency %d", 831 freqs[j]); 832 } 833 } 834 if (set_freq(initfreq)) 835 warn("error setting CPU frequency %d", initfreq); 836 free(freqs); 837 free(mwatts); 838 devd_close(); 839 if (!vflag) 840 pidfile_remove(pfh); 841 842 exit(0); 843 } 844