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
read_usage_times(int * load)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
read_freqs(int * numfreqs,int ** freqs,int ** power,int minfreq,int maxfreq)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
get_freq(void)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
set_freq(int freq)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
get_freq_id(int freq,int * freqs,int numfreqs)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
acline_init(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
acline_read(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