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 free(freqstr); 201 return (-1); 202 } 203 204 *numfreqs = 1; 205 for (p = freqstr; *p != '\0'; p++) 206 if (*p == ' ') 207 (*numfreqs)++; 208 209 if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) { 210 free(freqstr); 211 return (-1); 212 } 213 if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) { 214 free(freqstr); 215 free(*freqs); 216 return (-1); 217 } 218 for (i = 0, j = 0, p = freqstr; i < *numfreqs; i++) { 219 q = strchr(p, ' '); 220 if (q != NULL) 221 *q = '\0'; 222 if (sscanf(p, "%d/%d", &(*freqs)[j], &(*power)[i]) != 2) { 223 free(freqstr); 224 free(*freqs); 225 free(*power); 226 return (-1); 227 } 228 if (((*freqs)[j] >= minfreq || minfreq == -1) && 229 ((*freqs)[j] <= maxfreq || maxfreq == -1)) 230 j++; 231 p = q + 1; 232 } 233 234 *numfreqs = j; 235 if ((*freqs = realloc(*freqs, *numfreqs * sizeof(int))) == NULL) { 236 free(freqstr); 237 free(*freqs); 238 free(*power); 239 return (-1); 240 } 241 242 free(freqstr); 243 return (0); 244 } 245 246 static int 247 get_freq(void) 248 { 249 size_t len; 250 int curfreq; 251 252 len = sizeof(curfreq); 253 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) { 254 if (vflag) 255 warn("error reading current CPU frequency"); 256 curfreq = 0; 257 } 258 return (curfreq); 259 } 260 261 static int 262 set_freq(int freq) 263 { 264 265 if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq))) { 266 if (errno != EPERM) 267 return (-1); 268 } 269 270 return (0); 271 } 272 273 static int 274 get_freq_id(int freq, int *freqs, int numfreqs) 275 { 276 int i = 1; 277 278 while (i < numfreqs) { 279 if (freqs[i] < freq) 280 break; 281 i++; 282 } 283 return (i - 1); 284 } 285 286 /* 287 * Try to use ACPI to find the AC line status. If this fails, fall back 288 * to APM. If nothing succeeds, we'll just run in default mode. 289 */ 290 static void 291 acline_init(void) 292 { 293 int skip_source_check; 294 295 acline_mib_len = 4; 296 acline_status = SRC_UNKNOWN; 297 skip_source_check = (acline_mode_user == ac_none || 298 acline_mode_user == ac_acpi_devd); 299 300 if ((skip_source_check || acline_mode_user == ac_sysctl) && 301 sysctlnametomib(ACPIAC, acline_mib, &acline_mib_len) == 0) { 302 acline_mode = ac_sysctl; 303 if (vflag) 304 warnx("using sysctl for AC line status"); 305 #ifdef __powerpc__ 306 } else if ((skip_source_check || acline_mode_user == ac_sysctl) && 307 sysctlnametomib(PMUAC, acline_mib, &acline_mib_len) == 0) { 308 acline_mode = ac_sysctl; 309 if (vflag) 310 warnx("using sysctl for AC line status"); 311 #endif 312 #ifdef USE_APM 313 } else if ((skip_source_check || acline_mode_user == ac_apm) && 314 (apm_fd = open(APMDEV, O_RDONLY)) >= 0) { 315 if (vflag) 316 warnx("using APM for AC line status"); 317 acline_mode = ac_apm; 318 #endif 319 } else { 320 warnx("unable to determine AC line status"); 321 acline_mode = ac_none; 322 } 323 } 324 325 static void 326 acline_read(void) 327 { 328 if (acline_mode == ac_acpi_devd) { 329 char buf[DEVCTL_MAXBUF], *ptr; 330 ssize_t rlen; 331 int notify; 332 333 rlen = read(devd_pipe, buf, sizeof(buf)); 334 if (rlen == 0 || (rlen < 0 && errno != EWOULDBLOCK)) { 335 if (vflag) 336 warnx("lost devd connection, switching to sysctl"); 337 devd_close(); 338 acline_mode = ac_sysctl; 339 /* FALLTHROUGH */ 340 } 341 if (rlen > 0 && 342 (ptr = strstr(buf, "system=ACPI")) != NULL && 343 (ptr = strstr(ptr, "subsystem=ACAD")) != NULL && 344 (ptr = strstr(ptr, "notify=")) != NULL && 345 sscanf(ptr, "notify=%x", ¬ify) == 1) 346 acline_status = (notify ? SRC_AC : SRC_BATTERY); 347 } 348 if (acline_mode == ac_sysctl) { 349 int acline; 350 size_t len; 351 352 len = sizeof(acline); 353 if (sysctl(acline_mib, acline_mib_len, &acline, &len, 354 NULL, 0) == 0) 355 acline_status = (acline ? SRC_AC : SRC_BATTERY); 356 else 357 acline_status = SRC_UNKNOWN; 358 } 359 #ifdef USE_APM 360 if (acline_mode == ac_apm) { 361 struct apm_info info; 362 363 if (ioctl(apm_fd, APMIO_GETINFO, &info) == 0) { 364 acline_status = (info.ai_acline ? SRC_AC : SRC_BATTERY); 365 } else { 366 close(apm_fd); 367 apm_fd = -1; 368 acline_mode = ac_none; 369 acline_status = SRC_UNKNOWN; 370 } 371 } 372 #endif 373 /* try to (re)connect to devd */ 374 #ifdef USE_APM 375 if ((acline_mode == ac_sysctl && 376 (acline_mode_user == ac_none || 377 acline_mode_user == ac_acpi_devd)) || 378 (acline_mode == ac_apm && 379 acline_mode_user == ac_acpi_devd)) { 380 #else 381 if (acline_mode == ac_sysctl && 382 (acline_mode_user == ac_none || 383 acline_mode_user == ac_acpi_devd)) { 384 #endif 385 struct timeval now; 386 387 gettimeofday(&now, NULL); 388 if (now.tv_sec > tried_devd.tv_sec + DEVD_RETRY_INTERVAL) { 389 if (devd_init() >= 0) { 390 if (vflag) 391 warnx("using devd for AC line status"); 392 acline_mode = ac_acpi_devd; 393 } 394 tried_devd = now; 395 } 396 } 397 } 398 399 static int 400 devd_init(void) 401 { 402 struct sockaddr_un devd_addr; 403 404 bzero(&devd_addr, sizeof(devd_addr)); 405 if ((devd_pipe = socket(PF_LOCAL, SOCK_STREAM|SOCK_NONBLOCK, 0)) < 0) { 406 if (vflag) 407 warn("%s(): socket()", __func__); 408 return (-1); 409 } 410 411 devd_addr.sun_family = PF_LOCAL; 412 strlcpy(devd_addr.sun_path, DEVDPIPE, sizeof(devd_addr.sun_path)); 413 if (connect(devd_pipe, (struct sockaddr *)&devd_addr, 414 sizeof(devd_addr)) == -1) { 415 if (vflag) 416 warn("%s(): connect()", __func__); 417 close(devd_pipe); 418 devd_pipe = -1; 419 return (-1); 420 } 421 422 return (devd_pipe); 423 } 424 425 static void 426 devd_close(void) 427 { 428 429 close(devd_pipe); 430 devd_pipe = -1; 431 } 432 433 static void 434 parse_mode(char *arg, int *mode, int ch) 435 { 436 437 if (strcmp(arg, "minimum") == 0 || strcmp(arg, "min") == 0) 438 *mode = MODE_MIN; 439 else if (strcmp(arg, "maximum") == 0 || strcmp(arg, "max") == 0) 440 *mode = MODE_MAX; 441 else if (strcmp(arg, "adaptive") == 0 || strcmp(arg, "adp") == 0) 442 *mode = MODE_ADAPTIVE; 443 else if (strcmp(arg, "hiadaptive") == 0 || strcmp(arg, "hadp") == 0) 444 *mode = MODE_HIADAPTIVE; 445 else 446 errx(1, "bad option: -%c %s", (char)ch, optarg); 447 } 448 449 static void 450 parse_acline_mode(char *arg, int ch) 451 { 452 if (strcmp(arg, "sysctl") == 0) 453 acline_mode_user = ac_sysctl; 454 else if (strcmp(arg, "devd") == 0) 455 acline_mode_user = ac_acpi_devd; 456 #ifdef USE_APM 457 else if (strcmp(arg, "apm") == 0) 458 acline_mode_user = ac_apm; 459 #endif 460 else 461 errx(1, "bad option: -%c %s", (char)ch, optarg); 462 } 463 464 static void 465 handle_sigs(int __unused sig) 466 { 467 468 exit_requested = 1; 469 } 470 471 static void 472 usage(void) 473 { 474 475 fprintf(stderr, 476 "usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-n mode] [-p ival] [-r %%] [-s source] [-P pidfile]\n"); 477 exit(1); 478 } 479 480 int 481 main(int argc, char * argv[]) 482 { 483 struct timeval timeout; 484 fd_set fdset; 485 int nfds; 486 struct pidfh *pfh = NULL; 487 const char *pidfile = NULL; 488 int freq, curfreq, initfreq, *freqs, i, j, *mwatts, numfreqs, load; 489 int minfreq = -1, maxfreq = -1; 490 int ch, mode, mode_ac, mode_battery, mode_none, idle, to; 491 uint64_t mjoules_used; 492 size_t len; 493 494 /* Default mode for all AC states is adaptive. */ 495 mode_ac = mode_none = MODE_HIADAPTIVE; 496 mode_battery = MODE_ADAPTIVE; 497 cpu_running_mark = DEFAULT_ACTIVE_PERCENT; 498 cpu_idle_mark = DEFAULT_IDLE_PERCENT; 499 poll_ival = DEFAULT_POLL_INTERVAL; 500 mjoules_used = 0; 501 vflag = 0; 502 503 /* User must be root to control frequencies. */ 504 if (geteuid() != 0) 505 errx(1, "must be root to run"); 506 507 while ((ch = getopt(argc, argv, "a:b:i:m:M:n:p:P:r:s:v")) != -1) 508 switch (ch) { 509 case 'a': 510 parse_mode(optarg, &mode_ac, ch); 511 break; 512 case 'b': 513 parse_mode(optarg, &mode_battery, ch); 514 break; 515 case 's': 516 parse_acline_mode(optarg, ch); 517 break; 518 case 'i': 519 cpu_idle_mark = atoi(optarg); 520 if (cpu_idle_mark < 0 || cpu_idle_mark > 100) { 521 warnx("%d is not a valid percent", 522 cpu_idle_mark); 523 usage(); 524 } 525 break; 526 case 'm': 527 minfreq = atoi(optarg); 528 if (minfreq < 0) { 529 warnx("%d is not a valid CPU frequency", 530 minfreq); 531 usage(); 532 } 533 break; 534 case 'M': 535 maxfreq = atoi(optarg); 536 if (maxfreq < 0) { 537 warnx("%d is not a valid CPU frequency", 538 maxfreq); 539 usage(); 540 } 541 break; 542 case 'n': 543 parse_mode(optarg, &mode_none, ch); 544 break; 545 case 'p': 546 poll_ival = atoi(optarg); 547 if (poll_ival < 5) { 548 warnx("poll interval is in units of ms"); 549 usage(); 550 } 551 break; 552 case 'P': 553 pidfile = optarg; 554 break; 555 case 'r': 556 cpu_running_mark = atoi(optarg); 557 if (cpu_running_mark <= 0 || cpu_running_mark > 100) { 558 warnx("%d is not a valid percent", 559 cpu_running_mark); 560 usage(); 561 } 562 break; 563 case 'v': 564 vflag = 1; 565 break; 566 default: 567 usage(); 568 } 569 570 mode = mode_none; 571 572 /* Poll interval is in units of ms. */ 573 poll_ival *= 1000; 574 575 /* Look up various sysctl MIBs. */ 576 len = 2; 577 if (sysctlnametomib("kern.cp_times", cp_times_mib, &len)) 578 err(1, "lookup kern.cp_times"); 579 len = 4; 580 if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len)) 581 err(EX_UNAVAILABLE, "no cpufreq(4) support -- aborting"); 582 len = 4; 583 if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len)) 584 err(1, "lookup freq_levels"); 585 586 /* Check if we can read the load and supported freqs. */ 587 if (read_usage_times(NULL)) 588 err(1, "read_usage_times"); 589 if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq)) 590 err(1, "error reading supported CPU frequencies"); 591 if (numfreqs == 0) 592 errx(1, "no CPU frequencies in user-specified range"); 593 594 /* Run in the background unless in verbose mode. */ 595 if (!vflag) { 596 pid_t otherpid; 597 598 pfh = pidfile_open(pidfile, 0600, &otherpid); 599 if (pfh == NULL) { 600 if (errno == EEXIST) { 601 errx(1, "powerd already running, pid: %d", 602 otherpid); 603 } 604 warn("cannot open pid file"); 605 } 606 if (daemon(0, 0) != 0) { 607 warn("cannot enter daemon mode, exiting"); 608 pidfile_remove(pfh); 609 exit(EXIT_FAILURE); 610 611 } 612 pidfile_write(pfh); 613 } 614 615 /* Decide whether to use ACPI or APM to read the AC line status. */ 616 acline_init(); 617 618 /* 619 * Exit cleanly on signals. 620 */ 621 signal(SIGINT, handle_sigs); 622 signal(SIGTERM, handle_sigs); 623 624 freq = initfreq = curfreq = get_freq(); 625 i = get_freq_id(curfreq, freqs, numfreqs); 626 if (freq < 1) 627 freq = 1; 628 629 /* 630 * If we are in adaptive mode and the current frequency is outside the 631 * user-defined range, adjust it to be within the user-defined range. 632 */ 633 acline_read(); 634 if (acline_status > SRC_UNKNOWN) 635 errx(1, "invalid AC line status %d", acline_status); 636 if ((acline_status == SRC_AC && 637 (mode_ac == MODE_ADAPTIVE || mode_ac == MODE_HIADAPTIVE)) || 638 (acline_status == SRC_BATTERY && 639 (mode_battery == MODE_ADAPTIVE || mode_battery == MODE_HIADAPTIVE)) || 640 (acline_status == SRC_UNKNOWN && 641 (mode_none == MODE_ADAPTIVE || mode_none == MODE_HIADAPTIVE))) { 642 /* Read the current frequency. */ 643 len = sizeof(curfreq); 644 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) { 645 if (vflag) 646 warn("error reading current CPU frequency"); 647 } 648 if (curfreq < freqs[numfreqs - 1]) { 649 if (vflag) { 650 printf("CPU frequency is below user-defined " 651 "minimum; changing frequency to %d " 652 "MHz\n", freqs[numfreqs - 1]); 653 } 654 if (set_freq(freqs[numfreqs - 1]) != 0) { 655 warn("error setting CPU freq %d", 656 freqs[numfreqs - 1]); 657 } 658 } else if (curfreq > freqs[0]) { 659 if (vflag) { 660 printf("CPU frequency is above user-defined " 661 "maximum; changing frequency to %d " 662 "MHz\n", freqs[0]); 663 } 664 if (set_freq(freqs[0]) != 0) { 665 warn("error setting CPU freq %d", 666 freqs[0]); 667 } 668 } 669 } 670 671 idle = 0; 672 /* Main loop. */ 673 for (;;) { 674 FD_ZERO(&fdset); 675 if (devd_pipe >= 0) { 676 FD_SET(devd_pipe, &fdset); 677 nfds = devd_pipe + 1; 678 } else { 679 nfds = 0; 680 } 681 if (mode == MODE_HIADAPTIVE || idle < 120) 682 to = poll_ival; 683 else if (idle < 360) 684 to = poll_ival * 2; 685 else 686 to = poll_ival * 4; 687 timeout.tv_sec = to / 1000000; 688 timeout.tv_usec = to % 1000000; 689 select(nfds, &fdset, NULL, &fdset, &timeout); 690 691 /* If the user requested we quit, print some statistics. */ 692 if (exit_requested) { 693 if (vflag && mjoules_used != 0) 694 printf("total joules used: %u.%03u\n", 695 (u_int)(mjoules_used / 1000), 696 (int)mjoules_used % 1000); 697 break; 698 } 699 700 /* Read the current AC status and record the mode. */ 701 acline_read(); 702 switch (acline_status) { 703 case SRC_AC: 704 mode = mode_ac; 705 break; 706 case SRC_BATTERY: 707 mode = mode_battery; 708 break; 709 case SRC_UNKNOWN: 710 mode = mode_none; 711 break; 712 default: 713 errx(1, "invalid AC line status %d", acline_status); 714 } 715 716 /* Read the current frequency. */ 717 if (idle % 32 == 0) { 718 if ((curfreq = get_freq()) == 0) 719 continue; 720 i = get_freq_id(curfreq, freqs, numfreqs); 721 } 722 idle++; 723 if (vflag) { 724 /* Keep a sum of all power actually used. */ 725 if (mwatts[i] != -1) 726 mjoules_used += 727 (mwatts[i] * (poll_ival / 1000)) / 1000; 728 } 729 730 /* Always switch to the lowest frequency in min mode. */ 731 if (mode == MODE_MIN) { 732 freq = freqs[numfreqs - 1]; 733 if (curfreq != freq) { 734 if (vflag) { 735 printf("now operating on %s power; " 736 "changing frequency to %d MHz\n", 737 modes[acline_status], freq); 738 } 739 idle = 0; 740 if (set_freq(freq) != 0) { 741 warn("error setting CPU freq %d", 742 freq); 743 continue; 744 } 745 } 746 continue; 747 } 748 749 /* Always switch to the highest frequency in max mode. */ 750 if (mode == MODE_MAX) { 751 freq = freqs[0]; 752 if (curfreq != freq) { 753 if (vflag) { 754 printf("now operating on %s power; " 755 "changing frequency to %d MHz\n", 756 modes[acline_status], freq); 757 } 758 idle = 0; 759 if (set_freq(freq) != 0) { 760 warn("error setting CPU freq %d", 761 freq); 762 continue; 763 } 764 } 765 continue; 766 } 767 768 /* Adaptive mode; get the current CPU usage times. */ 769 if (read_usage_times(&load)) { 770 if (vflag) 771 warn("read_usage_times() failed"); 772 continue; 773 } 774 775 if (mode == MODE_ADAPTIVE) { 776 if (load > cpu_running_mark) { 777 if (load > 95 || load > cpu_running_mark * 2) 778 freq *= 2; 779 else 780 freq = freq * load / cpu_running_mark; 781 if (freq > freqs[0]) 782 freq = freqs[0]; 783 } else if (load < cpu_idle_mark && 784 curfreq * load < freqs[get_freq_id( 785 freq * 7 / 8, freqs, numfreqs)] * 786 cpu_running_mark) { 787 freq = freq * 7 / 8; 788 if (freq < freqs[numfreqs - 1]) 789 freq = freqs[numfreqs - 1]; 790 } 791 } else { /* MODE_HIADAPTIVE */ 792 if (load > cpu_running_mark / 2) { 793 if (load > 95 || load > cpu_running_mark) 794 freq *= 4; 795 else 796 freq = freq * load * 2 / cpu_running_mark; 797 if (freq > freqs[0] * 2) 798 freq = freqs[0] * 2; 799 } else if (load < cpu_idle_mark / 2 && 800 curfreq * load < freqs[get_freq_id( 801 freq * 31 / 32, freqs, numfreqs)] * 802 cpu_running_mark / 2) { 803 freq = freq * 31 / 32; 804 if (freq < freqs[numfreqs - 1]) 805 freq = freqs[numfreqs - 1]; 806 } 807 } 808 if (vflag) { 809 printf("load %3d%%, current freq %4d MHz (%2d), wanted freq %4d MHz\n", 810 load, curfreq, i, freq); 811 } 812 j = get_freq_id(freq, freqs, numfreqs); 813 if (i != j) { 814 if (vflag) { 815 printf("changing clock" 816 " speed from %d MHz to %d MHz\n", 817 freqs[i], freqs[j]); 818 } 819 idle = 0; 820 if (set_freq(freqs[j])) 821 warn("error setting CPU frequency %d", 822 freqs[j]); 823 } 824 } 825 if (set_freq(initfreq)) 826 warn("error setting CPU frequency %d", initfreq); 827 free(freqs); 828 free(mwatts); 829 devd_close(); 830 if (!vflag) 831 pidfile_remove(pfh); 832 833 exit(0); 834 } 835