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