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