1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/ioctl.h> 35 #include <sys/sysctl.h> 36 #include <sys/resource.h> 37 #include <sys/socket.h> 38 #include <sys/time.h> 39 #include <sys/un.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <libutil.h> 45 #include <signal.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <sysexits.h> 50 #include <unistd.h> 51 52 #ifdef __i386__ 53 #define USE_APM 54 #endif 55 56 #ifdef USE_APM 57 #include <machine/apm_bios.h> 58 #endif 59 60 #define DEFAULT_ACTIVE_PERCENT 75 61 #define DEFAULT_IDLE_PERCENT 50 62 #define DEFAULT_POLL_INTERVAL 250 /* Poll interval in milliseconds */ 63 64 typedef enum { 65 MODE_MIN, 66 MODE_ADAPTIVE, 67 MODE_HIADAPTIVE, 68 MODE_MAX, 69 } modes_t; 70 71 typedef enum { 72 SRC_AC, 73 SRC_BATTERY, 74 SRC_UNKNOWN, 75 } power_src_t; 76 77 static const char *modes[] = { 78 "AC", 79 "battery", 80 "unknown" 81 }; 82 83 #define ACPIAC "hw.acpi.acline" 84 #define PMUAC "dev.pmu.0.acline" 85 #define APMDEV "/dev/apm" 86 #define DEVDPIPE "/var/run/devd.pipe" 87 #define DEVCTL_MAXBUF 1024 88 89 static int read_usage_times(int *load, int nonice); 90 static int read_freqs(int *numfreqs, int **freqs, int **power, 91 int minfreq, int maxfreq); 92 static int set_freq(int freq); 93 static void acline_init(void); 94 static void acline_read(void); 95 static int devd_init(void); 96 static void devd_close(void); 97 static void handle_sigs(int sig); 98 static void parse_mode(char *arg, int *mode, int ch); 99 static void usage(void); 100 101 /* Sysctl data structures. */ 102 static int cp_times_mib[2]; 103 static int freq_mib[4]; 104 static int levels_mib[4]; 105 static int acline_mib[4]; 106 static size_t acline_mib_len; 107 108 /* Configuration */ 109 static int cpu_running_mark; 110 static int cpu_idle_mark; 111 static int poll_ival; 112 static int vflag; 113 114 static volatile sig_atomic_t exit_requested; 115 static power_src_t acline_status; 116 typedef enum { 117 ac_none, 118 ac_sysctl, 119 ac_acpi_devd, 120 #ifdef USE_APM 121 ac_apm, 122 #endif 123 } acline_mode_t; 124 static acline_mode_t acline_mode; 125 static acline_mode_t acline_mode_user = ac_none; 126 #ifdef USE_APM 127 static int apm_fd = -1; 128 #endif 129 static int devd_pipe = -1; 130 131 #define DEVD_RETRY_INTERVAL 60 /* seconds */ 132 static struct timeval tried_devd; 133 134 /* 135 * This function returns summary load of all CPUs. It was made so 136 * intentionally to not reduce performance in scenarios when several 137 * threads are processing requests as a pipeline -- running one at 138 * a time on different CPUs and waiting for each other. If nonice 139 * is nonzero, only user+sys+intr time will be counted as load; any 140 * nice time will be treated as if idle. 141 */ 142 static int 143 read_usage_times(int *load, int nonice) 144 { 145 static long *cp_times = NULL, *cp_times_old = NULL; 146 static int ncpus = 0; 147 size_t cp_times_len; 148 int error, cpu, i, total, excl; 149 150 if (cp_times == NULL) { 151 cp_times_len = 0; 152 error = sysctl(cp_times_mib, 2, NULL, &cp_times_len, NULL, 0); 153 if (error) 154 return (error); 155 if ((cp_times = malloc(cp_times_len)) == NULL) 156 return (errno); 157 if ((cp_times_old = malloc(cp_times_len)) == NULL) { 158 free(cp_times); 159 cp_times = NULL; 160 return (errno); 161 } 162 ncpus = cp_times_len / (sizeof(long) * CPUSTATES); 163 } 164 165 cp_times_len = sizeof(long) * CPUSTATES * ncpus; 166 error = sysctl(cp_times_mib, 2, cp_times, &cp_times_len, NULL, 0); 167 if (error) 168 return (error); 169 170 if (load) { 171 *load = 0; 172 for (cpu = 0; cpu < ncpus; cpu++) { 173 total = 0; 174 for (i = 0; i < CPUSTATES; i++) { 175 total += cp_times[cpu * CPUSTATES + i] - 176 cp_times_old[cpu * CPUSTATES + i]; 177 } 178 if (total == 0) 179 continue; 180 excl = cp_times[cpu * CPUSTATES + CP_IDLE] - 181 cp_times_old[cpu * CPUSTATES + CP_IDLE]; 182 if (nonice) 183 excl += cp_times[cpu * CPUSTATES + CP_NICE] - 184 cp_times_old[cpu * CPUSTATES + CP_NICE]; 185 *load += 100 - excl * 100 / total; 186 } 187 } 188 189 memcpy(cp_times_old, cp_times, cp_times_len); 190 191 return (0); 192 } 193 194 static int 195 read_freqs(int *numfreqs, int **freqs, int **power, int minfreq, int maxfreq) 196 { 197 char *freqstr, *p, *q; 198 int i, j; 199 size_t len = 0; 200 201 if (sysctl(levels_mib, 4, NULL, &len, NULL, 0)) 202 return (-1); 203 if ((freqstr = malloc(len)) == NULL) 204 return (-1); 205 if (sysctl(levels_mib, 4, freqstr, &len, NULL, 0)) { 206 free(freqstr); 207 return (-1); 208 } 209 210 *numfreqs = 1; 211 for (p = freqstr; *p != '\0'; p++) 212 if (*p == ' ') 213 (*numfreqs)++; 214 215 if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) { 216 free(freqstr); 217 return (-1); 218 } 219 if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) { 220 free(freqstr); 221 free(*freqs); 222 return (-1); 223 } 224 for (i = 0, j = 0, p = freqstr; i < *numfreqs; i++) { 225 q = strchr(p, ' '); 226 if (q != NULL) 227 *q = '\0'; 228 if (sscanf(p, "%d/%d", &(*freqs)[j], &(*power)[i]) != 2) { 229 free(freqstr); 230 free(*freqs); 231 free(*power); 232 return (-1); 233 } 234 if (((*freqs)[j] >= minfreq || minfreq == -1) && 235 ((*freqs)[j] <= maxfreq || maxfreq == -1)) 236 j++; 237 p = q + 1; 238 } 239 240 *numfreqs = j; 241 if ((*freqs = realloc(*freqs, *numfreqs * sizeof(int))) == NULL) { 242 free(freqstr); 243 free(*freqs); 244 free(*power); 245 return (-1); 246 } 247 248 free(freqstr); 249 return (0); 250 } 251 252 static int 253 get_freq(void) 254 { 255 size_t len; 256 int curfreq; 257 258 len = sizeof(curfreq); 259 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) { 260 if (vflag) 261 warn("error reading current CPU frequency"); 262 curfreq = 0; 263 } 264 return (curfreq); 265 } 266 267 static int 268 set_freq(int freq) 269 { 270 271 if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq))) { 272 if (errno != EPERM) 273 return (-1); 274 } 275 276 return (0); 277 } 278 279 static int 280 get_freq_id(int freq, int *freqs, int numfreqs) 281 { 282 int i = 1; 283 284 while (i < numfreqs) { 285 if (freqs[i] < freq) 286 break; 287 i++; 288 } 289 return (i - 1); 290 } 291 292 /* 293 * Try to use ACPI to find the AC line status. If this fails, fall back 294 * to APM. If nothing succeeds, we'll just run in default mode. 295 */ 296 static void 297 acline_init(void) 298 { 299 int skip_source_check; 300 301 acline_mib_len = 4; 302 acline_status = SRC_UNKNOWN; 303 skip_source_check = (acline_mode_user == ac_none || 304 acline_mode_user == ac_acpi_devd); 305 306 if ((skip_source_check || acline_mode_user == ac_sysctl) && 307 sysctlnametomib(ACPIAC, acline_mib, &acline_mib_len) == 0) { 308 acline_mode = ac_sysctl; 309 if (vflag) 310 warnx("using sysctl for AC line status"); 311 #ifdef __powerpc__ 312 } else if ((skip_source_check || acline_mode_user == ac_sysctl) && 313 sysctlnametomib(PMUAC, acline_mib, &acline_mib_len) == 0) { 314 acline_mode = ac_sysctl; 315 if (vflag) 316 warnx("using sysctl for AC line status"); 317 #endif 318 #ifdef USE_APM 319 } else if ((skip_source_check || acline_mode_user == ac_apm) && 320 (apm_fd = open(APMDEV, O_RDONLY)) >= 0) { 321 if (vflag) 322 warnx("using APM for AC line status"); 323 acline_mode = ac_apm; 324 #endif 325 } else { 326 warnx("unable to determine AC line status"); 327 acline_mode = ac_none; 328 } 329 } 330 331 static void 332 acline_read(void) 333 { 334 if (acline_mode == ac_acpi_devd) { 335 char buf[DEVCTL_MAXBUF], *ptr; 336 ssize_t rlen; 337 int notify; 338 339 rlen = read(devd_pipe, buf, sizeof(buf)); 340 if (rlen == 0 || (rlen < 0 && errno != EWOULDBLOCK)) { 341 if (vflag) 342 warnx("lost devd connection, switching to sysctl"); 343 devd_close(); 344 acline_mode = ac_sysctl; 345 /* FALLTHROUGH */ 346 } 347 if (rlen > 0 && 348 (ptr = strstr(buf, "system=ACPI")) != NULL && 349 (ptr = strstr(ptr, "subsystem=ACAD")) != NULL && 350 (ptr = strstr(ptr, "notify=")) != NULL && 351 sscanf(ptr, "notify=%x", ¬ify) == 1) 352 acline_status = (notify ? SRC_AC : SRC_BATTERY); 353 } 354 if (acline_mode == ac_sysctl) { 355 int acline; 356 size_t len; 357 358 len = sizeof(acline); 359 if (sysctl(acline_mib, acline_mib_len, &acline, &len, 360 NULL, 0) == 0) 361 acline_status = (acline ? SRC_AC : SRC_BATTERY); 362 else 363 acline_status = SRC_UNKNOWN; 364 } 365 #ifdef USE_APM 366 if (acline_mode == ac_apm) { 367 struct apm_info info; 368 369 if (ioctl(apm_fd, APMIO_GETINFO, &info) == 0) { 370 acline_status = (info.ai_acline ? SRC_AC : SRC_BATTERY); 371 } else { 372 close(apm_fd); 373 apm_fd = -1; 374 acline_mode = ac_none; 375 acline_status = SRC_UNKNOWN; 376 } 377 } 378 #endif 379 /* try to (re)connect to devd */ 380 #ifdef USE_APM 381 if ((acline_mode == ac_sysctl && 382 (acline_mode_user == ac_none || 383 acline_mode_user == ac_acpi_devd)) || 384 (acline_mode == ac_apm && 385 acline_mode_user == ac_acpi_devd)) { 386 #else 387 if (acline_mode == ac_sysctl && 388 (acline_mode_user == ac_none || 389 acline_mode_user == ac_acpi_devd)) { 390 #endif 391 struct timeval now; 392 393 gettimeofday(&now, NULL); 394 if (now.tv_sec > tried_devd.tv_sec + DEVD_RETRY_INTERVAL) { 395 if (devd_init() >= 0) { 396 if (vflag) 397 warnx("using devd for AC line status"); 398 acline_mode = ac_acpi_devd; 399 } 400 tried_devd = now; 401 } 402 } 403 } 404 405 static int 406 devd_init(void) 407 { 408 struct sockaddr_un devd_addr; 409 410 bzero(&devd_addr, sizeof(devd_addr)); 411 if ((devd_pipe = socket(PF_LOCAL, SOCK_STREAM|SOCK_NONBLOCK, 0)) < 0) { 412 if (vflag) 413 warn("%s(): socket()", __func__); 414 return (-1); 415 } 416 417 devd_addr.sun_family = PF_LOCAL; 418 strlcpy(devd_addr.sun_path, DEVDPIPE, sizeof(devd_addr.sun_path)); 419 if (connect(devd_pipe, (struct sockaddr *)&devd_addr, 420 sizeof(devd_addr)) == -1) { 421 if (vflag) 422 warn("%s(): connect()", __func__); 423 close(devd_pipe); 424 devd_pipe = -1; 425 return (-1); 426 } 427 428 return (devd_pipe); 429 } 430 431 static void 432 devd_close(void) 433 { 434 435 close(devd_pipe); 436 devd_pipe = -1; 437 } 438 439 static void 440 parse_mode(char *arg, int *mode, int ch) 441 { 442 443 if (strcmp(arg, "minimum") == 0 || strcmp(arg, "min") == 0) 444 *mode = MODE_MIN; 445 else if (strcmp(arg, "maximum") == 0 || strcmp(arg, "max") == 0) 446 *mode = MODE_MAX; 447 else if (strcmp(arg, "adaptive") == 0 || strcmp(arg, "adp") == 0) 448 *mode = MODE_ADAPTIVE; 449 else if (strcmp(arg, "hiadaptive") == 0 || strcmp(arg, "hadp") == 0) 450 *mode = MODE_HIADAPTIVE; 451 else 452 errx(1, "bad option: -%c %s", (char)ch, optarg); 453 } 454 455 static void 456 parse_acline_mode(char *arg, int ch) 457 { 458 if (strcmp(arg, "sysctl") == 0) 459 acline_mode_user = ac_sysctl; 460 else if (strcmp(arg, "devd") == 0) 461 acline_mode_user = ac_acpi_devd; 462 #ifdef USE_APM 463 else if (strcmp(arg, "apm") == 0) 464 acline_mode_user = ac_apm; 465 #endif 466 else 467 errx(1, "bad option: -%c %s", (char)ch, optarg); 468 } 469 470 static void 471 handle_sigs(int __unused sig) 472 { 473 474 exit_requested = 1; 475 } 476 477 static void 478 usage(void) 479 { 480 481 fprintf(stderr, 482 "usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-N] [-n mode] [-p ival] [-r %%] [-s source] [-P pidfile]\n"); 483 exit(1); 484 } 485 486 int 487 main(int argc, char * argv[]) 488 { 489 struct timeval timeout; 490 fd_set fdset; 491 int nfds; 492 struct pidfh *pfh = NULL; 493 const char *pidfile = NULL; 494 int freq, curfreq, initfreq, *freqs, i, j, *mwatts, numfreqs, load; 495 int minfreq = -1, maxfreq = -1; 496 int ch, mode, mode_ac, mode_battery, mode_none, idle, to; 497 uint64_t mjoules_used; 498 size_t len; 499 int nonice; 500 501 /* Default mode for all AC states is adaptive. */ 502 mode_ac = mode_none = MODE_HIADAPTIVE; 503 mode_battery = MODE_ADAPTIVE; 504 cpu_running_mark = DEFAULT_ACTIVE_PERCENT; 505 cpu_idle_mark = DEFAULT_IDLE_PERCENT; 506 poll_ival = DEFAULT_POLL_INTERVAL; 507 mjoules_used = 0; 508 vflag = 0; 509 nonice = 0; 510 511 /* User must be root to control frequencies. */ 512 if (geteuid() != 0) 513 errx(1, "must be root to run"); 514 515 while ((ch = getopt(argc, argv, "a:b:i:m:M:Nn:p:P:r:s:v")) != -1) 516 switch (ch) { 517 case 'a': 518 parse_mode(optarg, &mode_ac, ch); 519 break; 520 case 'b': 521 parse_mode(optarg, &mode_battery, ch); 522 break; 523 case 's': 524 parse_acline_mode(optarg, ch); 525 break; 526 case 'i': 527 cpu_idle_mark = atoi(optarg); 528 if (cpu_idle_mark < 0 || cpu_idle_mark > 100) { 529 warnx("%d is not a valid percent", 530 cpu_idle_mark); 531 usage(); 532 } 533 break; 534 case 'm': 535 minfreq = atoi(optarg); 536 if (minfreq < 0) { 537 warnx("%d is not a valid CPU frequency", 538 minfreq); 539 usage(); 540 } 541 break; 542 case 'M': 543 maxfreq = atoi(optarg); 544 if (maxfreq < 0) { 545 warnx("%d is not a valid CPU frequency", 546 maxfreq); 547 usage(); 548 } 549 break; 550 case 'N': 551 nonice = 1; 552 break; 553 case 'n': 554 parse_mode(optarg, &mode_none, ch); 555 break; 556 case 'p': 557 poll_ival = atoi(optarg); 558 if (poll_ival < 5) { 559 warnx("poll interval is in units of ms"); 560 usage(); 561 } 562 break; 563 case 'P': 564 pidfile = optarg; 565 break; 566 case 'r': 567 cpu_running_mark = atoi(optarg); 568 if (cpu_running_mark <= 0 || cpu_running_mark > 100) { 569 warnx("%d is not a valid percent", 570 cpu_running_mark); 571 usage(); 572 } 573 break; 574 case 'v': 575 vflag = 1; 576 break; 577 default: 578 usage(); 579 } 580 581 mode = mode_none; 582 583 /* Poll interval is in units of ms. */ 584 poll_ival *= 1000; 585 586 /* Look up various sysctl MIBs. */ 587 len = 2; 588 if (sysctlnametomib("kern.cp_times", cp_times_mib, &len)) 589 err(1, "lookup kern.cp_times"); 590 len = 4; 591 if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len)) 592 err(EX_UNAVAILABLE, "no cpufreq(4) support -- aborting"); 593 len = 4; 594 if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len)) 595 err(1, "lookup freq_levels"); 596 597 /* Check if we can read the load and supported freqs. */ 598 if (read_usage_times(NULL, nonice)) 599 err(1, "read_usage_times"); 600 if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq)) 601 err(1, "error reading supported CPU frequencies"); 602 if (numfreqs == 0) 603 errx(1, "no CPU frequencies in user-specified range"); 604 605 /* Run in the background unless in verbose mode. */ 606 if (!vflag) { 607 pid_t otherpid; 608 609 pfh = pidfile_open(pidfile, 0600, &otherpid); 610 if (pfh == NULL) { 611 if (errno == EEXIST) { 612 errx(1, "powerd already running, pid: %d", 613 otherpid); 614 } 615 warn("cannot open pid file"); 616 } 617 if (daemon(0, 0) != 0) { 618 warn("cannot enter daemon mode, exiting"); 619 pidfile_remove(pfh); 620 exit(EXIT_FAILURE); 621 622 } 623 pidfile_write(pfh); 624 } 625 626 /* Decide whether to use ACPI or APM to read the AC line status. */ 627 acline_init(); 628 629 /* 630 * Exit cleanly on signals. 631 */ 632 signal(SIGINT, handle_sigs); 633 signal(SIGTERM, handle_sigs); 634 635 freq = initfreq = curfreq = get_freq(); 636 i = get_freq_id(curfreq, freqs, numfreqs); 637 if (freq < 1) 638 freq = 1; 639 640 /* 641 * If we are in adaptive mode and the current frequency is outside the 642 * user-defined range, adjust it to be within the user-defined range. 643 */ 644 acline_read(); 645 if (acline_status > SRC_UNKNOWN) 646 errx(1, "invalid AC line status %d", acline_status); 647 if ((acline_status == SRC_AC && 648 (mode_ac == MODE_ADAPTIVE || mode_ac == MODE_HIADAPTIVE)) || 649 (acline_status == SRC_BATTERY && 650 (mode_battery == MODE_ADAPTIVE || mode_battery == MODE_HIADAPTIVE)) || 651 (acline_status == SRC_UNKNOWN && 652 (mode_none == MODE_ADAPTIVE || mode_none == MODE_HIADAPTIVE))) { 653 /* Read the current frequency. */ 654 len = sizeof(curfreq); 655 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) { 656 if (vflag) 657 warn("error reading current CPU frequency"); 658 } 659 if (curfreq < freqs[numfreqs - 1]) { 660 if (vflag) { 661 printf("CPU frequency is below user-defined " 662 "minimum; changing frequency to %d " 663 "MHz\n", freqs[numfreqs - 1]); 664 } 665 if (set_freq(freqs[numfreqs - 1]) != 0) { 666 warn("error setting CPU freq %d", 667 freqs[numfreqs - 1]); 668 } 669 } else if (curfreq > freqs[0]) { 670 if (vflag) { 671 printf("CPU frequency is above user-defined " 672 "maximum; changing frequency to %d " 673 "MHz\n", freqs[0]); 674 } 675 if (set_freq(freqs[0]) != 0) { 676 warn("error setting CPU freq %d", 677 freqs[0]); 678 } 679 } 680 } 681 682 idle = 0; 683 /* Main loop. */ 684 for (;;) { 685 FD_ZERO(&fdset); 686 if (devd_pipe >= 0) { 687 FD_SET(devd_pipe, &fdset); 688 nfds = devd_pipe + 1; 689 } else { 690 nfds = 0; 691 } 692 if (mode == MODE_HIADAPTIVE || idle < 120) 693 to = poll_ival; 694 else if (idle < 360) 695 to = poll_ival * 2; 696 else 697 to = poll_ival * 4; 698 timeout.tv_sec = to / 1000000; 699 timeout.tv_usec = to % 1000000; 700 select(nfds, &fdset, NULL, &fdset, &timeout); 701 702 /* If the user requested we quit, print some statistics. */ 703 if (exit_requested) { 704 if (vflag && mjoules_used != 0) 705 printf("total joules used: %u.%03u\n", 706 (u_int)(mjoules_used / 1000), 707 (int)mjoules_used % 1000); 708 break; 709 } 710 711 /* Read the current AC status and record the mode. */ 712 acline_read(); 713 switch (acline_status) { 714 case SRC_AC: 715 mode = mode_ac; 716 break; 717 case SRC_BATTERY: 718 mode = mode_battery; 719 break; 720 case SRC_UNKNOWN: 721 mode = mode_none; 722 break; 723 default: 724 errx(1, "invalid AC line status %d", acline_status); 725 } 726 727 /* Read the current frequency. */ 728 if (idle % 32 == 0) { 729 if ((curfreq = get_freq()) == 0) 730 continue; 731 i = get_freq_id(curfreq, freqs, numfreqs); 732 } 733 idle++; 734 if (vflag) { 735 /* Keep a sum of all power actually used. */ 736 if (mwatts[i] != -1) 737 mjoules_used += 738 (mwatts[i] * (poll_ival / 1000)) / 1000; 739 } 740 741 /* Always switch to the lowest frequency in min mode. */ 742 if (mode == MODE_MIN) { 743 freq = freqs[numfreqs - 1]; 744 if (curfreq != freq) { 745 if (vflag) { 746 printf("now operating on %s power; " 747 "changing frequency to %d MHz\n", 748 modes[acline_status], freq); 749 } 750 idle = 0; 751 if (set_freq(freq) != 0) { 752 warn("error setting CPU freq %d", 753 freq); 754 continue; 755 } 756 } 757 continue; 758 } 759 760 /* Always switch to the highest frequency in max mode. */ 761 if (mode == MODE_MAX) { 762 freq = freqs[0]; 763 if (curfreq != freq) { 764 if (vflag) { 765 printf("now operating on %s power; " 766 "changing frequency to %d MHz\n", 767 modes[acline_status], freq); 768 } 769 idle = 0; 770 if (set_freq(freq) != 0) { 771 warn("error setting CPU freq %d", 772 freq); 773 continue; 774 } 775 } 776 continue; 777 } 778 779 /* Adaptive mode; get the current CPU usage times. */ 780 if (read_usage_times(&load, nonice)) { 781 if (vflag) 782 warn("read_usage_times() failed"); 783 continue; 784 } 785 786 if (mode == MODE_ADAPTIVE) { 787 if (load > cpu_running_mark) { 788 if (load > 95 || load > cpu_running_mark * 2) 789 freq *= 2; 790 else 791 freq = freq * load / cpu_running_mark; 792 if (freq > freqs[0]) 793 freq = freqs[0]; 794 } else if (load < cpu_idle_mark && 795 curfreq * load < freqs[get_freq_id( 796 freq * 7 / 8, freqs, numfreqs)] * 797 cpu_running_mark) { 798 freq = freq * 7 / 8; 799 if (freq < freqs[numfreqs - 1]) 800 freq = freqs[numfreqs - 1]; 801 } 802 } else { /* MODE_HIADAPTIVE */ 803 if (load > cpu_running_mark / 2) { 804 if (load > 95 || load > cpu_running_mark) 805 freq *= 4; 806 else 807 freq = freq * load * 2 / cpu_running_mark; 808 if (freq > freqs[0] * 2) 809 freq = freqs[0] * 2; 810 } else if (load < cpu_idle_mark / 2 && 811 curfreq * load < freqs[get_freq_id( 812 freq * 31 / 32, freqs, numfreqs)] * 813 cpu_running_mark / 2) { 814 freq = freq * 31 / 32; 815 if (freq < freqs[numfreqs - 1]) 816 freq = freqs[numfreqs - 1]; 817 } 818 } 819 if (vflag) { 820 printf("load %3d%%, current freq %4d MHz (%2d), wanted freq %4d MHz\n", 821 load, curfreq, i, freq); 822 } 823 j = get_freq_id(freq, freqs, numfreqs); 824 if (i != j) { 825 if (vflag) { 826 printf("changing clock" 827 " speed from %d MHz to %d MHz\n", 828 freqs[i], freqs[j]); 829 } 830 idle = 0; 831 if (set_freq(freqs[j])) 832 warn("error setting CPU frequency %d", 833 freqs[j]); 834 } 835 } 836 if (set_freq(initfreq)) 837 warn("error setting CPU frequency %d", initfreq); 838 free(freqs); 839 free(mwatts); 840 devd_close(); 841 if (!vflag) 842 pidfile_remove(pfh); 843 844 exit(0); 845 } 846