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: stable/10/usr.sbin/powerd/powerd.c 342983 2019-01-13 02:27:10Z avos $");
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 typedef enum {
115 ac_none,
116 ac_sysctl,
117 ac_acpi_devd,
118 #ifdef USE_APM
119 ac_apm,
120 #endif
121 } acline_mode_t;
122 static acline_mode_t acline_mode;
123 static acline_mode_t acline_mode_user = ac_none;
124 #ifdef USE_APM
125 static int apm_fd = -1;
126 #endif
127 static int devd_pipe = -1;
128
129 #define DEVD_RETRY_INTERVAL 60 /* seconds */
130 static struct timeval tried_devd;
131
132 /*
133 * This function returns summary load of all CPUs. It was made so
134 * intentionally to not reduce performance in scenarios when several
135 * threads are processing requests as a pipeline -- running one at
136 * a time on different CPUs and waiting for each other.
137 */
138 static int
read_usage_times(int * load)139 read_usage_times(int *load)
140 {
141 static long *cp_times = NULL, *cp_times_old = NULL;
142 static int ncpus = 0;
143 size_t cp_times_len;
144 int error, cpu, i, total;
145
146 if (cp_times == NULL) {
147 cp_times_len = 0;
148 error = sysctl(cp_times_mib, 2, NULL, &cp_times_len, NULL, 0);
149 if (error)
150 return (error);
151 if ((cp_times = malloc(cp_times_len)) == NULL)
152 return (errno);
153 if ((cp_times_old = malloc(cp_times_len)) == NULL) {
154 free(cp_times);
155 cp_times = NULL;
156 return (errno);
157 }
158 ncpus = cp_times_len / (sizeof(long) * CPUSTATES);
159 }
160
161 cp_times_len = sizeof(long) * CPUSTATES * ncpus;
162 error = sysctl(cp_times_mib, 2, cp_times, &cp_times_len, NULL, 0);
163 if (error)
164 return (error);
165
166 if (load) {
167 *load = 0;
168 for (cpu = 0; cpu < ncpus; cpu++) {
169 total = 0;
170 for (i = 0; i < CPUSTATES; i++) {
171 total += cp_times[cpu * CPUSTATES + i] -
172 cp_times_old[cpu * CPUSTATES + i];
173 }
174 if (total == 0)
175 continue;
176 *load += 100 - (cp_times[cpu * CPUSTATES + CP_IDLE] -
177 cp_times_old[cpu * CPUSTATES + CP_IDLE]) * 100 / total;
178 }
179 }
180
181 memcpy(cp_times_old, cp_times, cp_times_len);
182
183 return (0);
184 }
185
186 static int
read_freqs(int * numfreqs,int ** freqs,int ** power,int minfreq,int maxfreq)187 read_freqs(int *numfreqs, int **freqs, int **power, int minfreq, int maxfreq)
188 {
189 char *freqstr, *p, *q;
190 int i, j;
191 size_t len = 0;
192
193 if (sysctl(levels_mib, 4, NULL, &len, NULL, 0))
194 return (-1);
195 if ((freqstr = malloc(len)) == NULL)
196 return (-1);
197 if (sysctl(levels_mib, 4, freqstr, &len, NULL, 0))
198 return (-1);
199
200 *numfreqs = 1;
201 for (p = freqstr; *p != '\0'; p++)
202 if (*p == ' ')
203 (*numfreqs)++;
204
205 if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) {
206 free(freqstr);
207 return (-1);
208 }
209 if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) {
210 free(freqstr);
211 free(*freqs);
212 return (-1);
213 }
214 for (i = 0, j = 0, p = freqstr; i < *numfreqs; i++) {
215 q = strchr(p, ' ');
216 if (q != NULL)
217 *q = '\0';
218 if (sscanf(p, "%d/%d", &(*freqs)[j], &(*power)[i]) != 2) {
219 free(freqstr);
220 free(*freqs);
221 free(*power);
222 return (-1);
223 }
224 if (((*freqs)[j] >= minfreq || minfreq == -1) &&
225 ((*freqs)[j] <= maxfreq || maxfreq == -1))
226 j++;
227 p = q + 1;
228 }
229
230 *numfreqs = j;
231 if ((*freqs = realloc(*freqs, *numfreqs * sizeof(int))) == NULL) {
232 free(freqstr);
233 free(*freqs);
234 free(*power);
235 return (-1);
236 }
237
238 free(freqstr);
239 return (0);
240 }
241
242 static int
get_freq(void)243 get_freq(void)
244 {
245 size_t len;
246 int curfreq;
247
248 len = sizeof(curfreq);
249 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) {
250 if (vflag)
251 warn("error reading current CPU frequency");
252 curfreq = 0;
253 }
254 return (curfreq);
255 }
256
257 static int
set_freq(int freq)258 set_freq(int freq)
259 {
260
261 if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq))) {
262 if (errno != EPERM)
263 return (-1);
264 }
265
266 return (0);
267 }
268
269 static int
get_freq_id(int freq,int * freqs,int numfreqs)270 get_freq_id(int freq, int *freqs, int numfreqs)
271 {
272 int i = 1;
273
274 while (i < numfreqs) {
275 if (freqs[i] < freq)
276 break;
277 i++;
278 }
279 return (i - 1);
280 }
281
282 /*
283 * Try to use ACPI to find the AC line status. If this fails, fall back
284 * to APM. If nothing succeeds, we'll just run in default mode.
285 */
286 static void
acline_init(void)287 acline_init(void)
288 {
289 int skip_source_check;
290
291 acline_mib_len = 4;
292 acline_status = SRC_UNKNOWN;
293 skip_source_check = (acline_mode_user == ac_none ||
294 acline_mode_user == ac_acpi_devd);
295
296 if ((skip_source_check || acline_mode_user == ac_sysctl) &&
297 sysctlnametomib(ACPIAC, acline_mib, &acline_mib_len) == 0) {
298 acline_mode = ac_sysctl;
299 if (vflag)
300 warnx("using sysctl for AC line status");
301 #if __powerpc__
302 } else if ((skip_source_check || acline_mode_user == ac_sysctl) &&
303 sysctlnametomib(PMUAC, acline_mib, &acline_mib_len) == 0) {
304 acline_mode = ac_sysctl;
305 if (vflag)
306 warnx("using sysctl for AC line status");
307 #endif
308 #ifdef USE_APM
309 } else if ((skip_source_check || acline_mode_user == ac_apm) &&
310 (apm_fd = open(APMDEV, O_RDONLY)) >= 0) {
311 if (vflag)
312 warnx("using APM for AC line status");
313 acline_mode = ac_apm;
314 #endif
315 } else {
316 warnx("unable to determine AC line status");
317 acline_mode = ac_none;
318 }
319 }
320
321 static void
acline_read(void)322 acline_read(void)
323 {
324 if (acline_mode == ac_acpi_devd) {
325 char buf[DEVCTL_MAXBUF], *ptr;
326 ssize_t rlen;
327 int notify;
328
329 rlen = read(devd_pipe, buf, sizeof(buf));
330 if (rlen == 0 || (rlen < 0 && errno != EWOULDBLOCK)) {
331 if (vflag)
332 warnx("lost devd connection, switching to sysctl");
333 devd_close();
334 acline_mode = ac_sysctl;
335 /* FALLTHROUGH */
336 }
337 if (rlen > 0 &&
338 (ptr = strstr(buf, "system=ACPI")) != NULL &&
339 (ptr = strstr(ptr, "subsystem=ACAD")) != NULL &&
340 (ptr = strstr(ptr, "notify=")) != NULL &&
341 sscanf(ptr, "notify=%x", ¬ify) == 1)
342 acline_status = (notify ? SRC_AC : SRC_BATTERY);
343 }
344 if (acline_mode == ac_sysctl) {
345 int acline;
346 size_t len;
347
348 len = sizeof(acline);
349 if (sysctl(acline_mib, acline_mib_len, &acline, &len,
350 NULL, 0) == 0)
351 acline_status = (acline ? SRC_AC : SRC_BATTERY);
352 else
353 acline_status = SRC_UNKNOWN;
354 }
355 #ifdef USE_APM
356 if (acline_mode == ac_apm) {
357 struct apm_info info;
358
359 if (ioctl(apm_fd, APMIO_GETINFO, &info) == 0) {
360 acline_status = (info.ai_acline ? SRC_AC : SRC_BATTERY);
361 } else {
362 close(apm_fd);
363 apm_fd = -1;
364 acline_mode = ac_none;
365 acline_status = SRC_UNKNOWN;
366 }
367 }
368 #endif
369 /* try to (re)connect to devd */
370 #ifdef USE_APM
371 if ((acline_mode == ac_sysctl &&
372 (acline_mode_user == ac_none ||
373 acline_mode_user == ac_acpi_devd)) ||
374 (acline_mode == ac_apm &&
375 acline_mode_user == ac_acpi_devd)) {
376 #else
377 if (acline_mode == ac_sysctl &&
378 (acline_mode_user == ac_none ||
379 acline_mode_user == ac_acpi_devd)) {
380 #endif
381 struct timeval now;
382
383 gettimeofday(&now, NULL);
384 if (now.tv_sec > tried_devd.tv_sec + DEVD_RETRY_INTERVAL) {
385 if (devd_init() >= 0) {
386 if (vflag)
387 warnx("using devd for AC line status");
388 acline_mode = ac_acpi_devd;
389 }
390 tried_devd = now;
391 }
392 }
393 }
394
395 static int
396 devd_init(void)
397 {
398 struct sockaddr_un devd_addr;
399
400 bzero(&devd_addr, sizeof(devd_addr));
401 if ((devd_pipe = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
402 if (vflag)
403 warn("%s(): socket()", __func__);
404 return (-1);
405 }
406
407 devd_addr.sun_family = PF_LOCAL;
408 strlcpy(devd_addr.sun_path, DEVDPIPE, sizeof(devd_addr.sun_path));
409 if (connect(devd_pipe, (struct sockaddr *)&devd_addr,
410 sizeof(devd_addr)) == -1) {
411 if (vflag)
412 warn("%s(): connect()", __func__);
413 close(devd_pipe);
414 devd_pipe = -1;
415 return (-1);
416 }
417
418 if (fcntl(devd_pipe, F_SETFL, O_NONBLOCK) == -1) {
419 if (vflag)
420 warn("%s(): fcntl()", __func__);
421 close(devd_pipe);
422 return (-1);
423 }
424
425 return (devd_pipe);
426 }
427
428 static void
429 devd_close(void)
430 {
431
432 close(devd_pipe);
433 devd_pipe = -1;
434 }
435
436 static void
437 parse_mode(char *arg, int *mode, int ch)
438 {
439
440 if (strcmp(arg, "minimum") == 0 || strcmp(arg, "min") == 0)
441 *mode = MODE_MIN;
442 else if (strcmp(arg, "maximum") == 0 || strcmp(arg, "max") == 0)
443 *mode = MODE_MAX;
444 else if (strcmp(arg, "adaptive") == 0 || strcmp(arg, "adp") == 0)
445 *mode = MODE_ADAPTIVE;
446 else if (strcmp(arg, "hiadaptive") == 0 || strcmp(arg, "hadp") == 0)
447 *mode = MODE_HIADAPTIVE;
448 else
449 errx(1, "bad option: -%c %s", (char)ch, optarg);
450 }
451
452 static void
453 parse_acline_mode(char *arg, int ch)
454 {
455 if (strcmp(arg, "sysctl") == 0)
456 acline_mode_user = ac_sysctl;
457 else if (strcmp(arg, "devd") == 0)
458 acline_mode_user = ac_acpi_devd;
459 #ifdef USE_APM
460 else if (strcmp(arg, "apm") == 0)
461 acline_mode_user = ac_apm;
462 #endif
463 else
464 errx(1, "bad option: -%c %s", (char)ch, optarg);
465 }
466
467 static void
468 handle_sigs(int __unused sig)
469 {
470
471 exit_requested = 1;
472 }
473
474 static void
475 usage(void)
476 {
477
478 fprintf(stderr,
479 "usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-n mode] [-p ival] [-r %%] [-s source] [-P pidfile]\n");
480 exit(1);
481 }
482
483 int
484 main(int argc, char * argv[])
485 {
486 struct timeval timeout;
487 fd_set fdset;
488 int nfds;
489 struct pidfh *pfh = NULL;
490 const char *pidfile = NULL;
491 int freq, curfreq, initfreq, *freqs, i, j, *mwatts, numfreqs, load;
492 int minfreq = -1, maxfreq = -1;
493 int ch, mode, mode_ac, mode_battery, mode_none, idle, to;
494 uint64_t mjoules_used;
495 size_t len;
496
497 /* Default mode for all AC states is adaptive. */
498 mode_ac = mode_none = MODE_HIADAPTIVE;
499 mode_battery = MODE_ADAPTIVE;
500 cpu_running_mark = DEFAULT_ACTIVE_PERCENT;
501 cpu_idle_mark = DEFAULT_IDLE_PERCENT;
502 poll_ival = DEFAULT_POLL_INTERVAL;
503 mjoules_used = 0;
504 vflag = 0;
505
506 /* User must be root to control frequencies. */
507 if (geteuid() != 0)
508 errx(1, "must be root to run");
509
510 while ((ch = getopt(argc, argv, "a:b:i:m:M:n:p:P:r:s:v")) != -1)
511 switch (ch) {
512 case 'a':
513 parse_mode(optarg, &mode_ac, ch);
514 break;
515 case 'b':
516 parse_mode(optarg, &mode_battery, ch);
517 break;
518 case 's':
519 parse_acline_mode(optarg, ch);
520 break;
521 case 'i':
522 cpu_idle_mark = atoi(optarg);
523 if (cpu_idle_mark < 0 || cpu_idle_mark > 100) {
524 warnx("%d is not a valid percent",
525 cpu_idle_mark);
526 usage();
527 }
528 break;
529 case 'm':
530 minfreq = atoi(optarg);
531 if (minfreq < 0) {
532 warnx("%d is not a valid CPU frequency",
533 minfreq);
534 usage();
535 }
536 break;
537 case 'M':
538 maxfreq = atoi(optarg);
539 if (maxfreq < 0) {
540 warnx("%d is not a valid CPU frequency",
541 maxfreq);
542 usage();
543 }
544 break;
545 case 'n':
546 parse_mode(optarg, &mode_none, ch);
547 break;
548 case 'p':
549 poll_ival = atoi(optarg);
550 if (poll_ival < 5) {
551 warnx("poll interval is in units of ms");
552 usage();
553 }
554 break;
555 case 'P':
556 pidfile = optarg;
557 break;
558 case 'r':
559 cpu_running_mark = atoi(optarg);
560 if (cpu_running_mark <= 0 || cpu_running_mark > 100) {
561 warnx("%d is not a valid percent",
562 cpu_running_mark);
563 usage();
564 }
565 break;
566 case 'v':
567 vflag = 1;
568 break;
569 default:
570 usage();
571 }
572
573 mode = mode_none;
574
575 /* Poll interval is in units of ms. */
576 poll_ival *= 1000;
577
578 /* Look up various sysctl MIBs. */
579 len = 2;
580 if (sysctlnametomib("kern.cp_times", cp_times_mib, &len))
581 err(1, "lookup kern.cp_times");
582 len = 4;
583 if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len))
584 err(EX_UNAVAILABLE, "no cpufreq(4) support -- aborting");
585 len = 4;
586 if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len))
587 err(1, "lookup freq_levels");
588
589 /* Check if we can read the load and supported freqs. */
590 if (read_usage_times(NULL))
591 err(1, "read_usage_times");
592 if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq))
593 err(1, "error reading supported CPU frequencies");
594 if (numfreqs == 0)
595 errx(1, "no CPU frequencies in user-specified range");
596
597 /* Run in the background unless in verbose mode. */
598 if (!vflag) {
599 pid_t otherpid;
600
601 pfh = pidfile_open(pidfile, 0600, &otherpid);
602 if (pfh == NULL) {
603 if (errno == EEXIST) {
604 errx(1, "powerd already running, pid: %d",
605 otherpid);
606 }
607 warn("cannot open pid file");
608 }
609 if (daemon(0, 0) != 0) {
610 warn("cannot enter daemon mode, exiting");
611 pidfile_remove(pfh);
612 exit(EXIT_FAILURE);
613
614 }
615 pidfile_write(pfh);
616 }
617
618 /* Decide whether to use ACPI or APM to read the AC line status. */
619 acline_init();
620
621 /*
622 * Exit cleanly on signals.
623 */
624 signal(SIGINT, handle_sigs);
625 signal(SIGTERM, handle_sigs);
626
627 freq = initfreq = curfreq = get_freq();
628 i = get_freq_id(curfreq, freqs, numfreqs);
629 if (freq < 1)
630 freq = 1;
631
632 /*
633 * If we are in adaptive mode and the current frequency is outside the
634 * user-defined range, adjust it to be within the user-defined range.
635 */
636 acline_read();
637 if (acline_status > SRC_UNKNOWN)
638 errx(1, "invalid AC line status %d", acline_status);
639 if ((acline_status == SRC_AC &&
640 (mode_ac == MODE_ADAPTIVE || mode_ac == MODE_HIADAPTIVE)) ||
641 (acline_status == SRC_BATTERY &&
642 (mode_battery == MODE_ADAPTIVE || mode_battery == MODE_HIADAPTIVE)) ||
643 (acline_status == SRC_UNKNOWN &&
644 (mode_none == MODE_ADAPTIVE || mode_none == MODE_HIADAPTIVE))) {
645 /* Read the current frequency. */
646 len = sizeof(curfreq);
647 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) {
648 if (vflag)
649 warn("error reading current CPU frequency");
650 }
651 if (curfreq < freqs[numfreqs - 1]) {
652 if (vflag) {
653 printf("CPU frequency is below user-defined "
654 "minimum; changing frequency to %d "
655 "MHz\n", freqs[numfreqs - 1]);
656 }
657 if (set_freq(freqs[numfreqs - 1]) != 0) {
658 warn("error setting CPU freq %d",
659 freqs[numfreqs - 1]);
660 }
661 } else if (curfreq > freqs[0]) {
662 if (vflag) {
663 printf("CPU frequency is above user-defined "
664 "maximum; changing frequency to %d "
665 "MHz\n", freqs[0]);
666 }
667 if (set_freq(freqs[0]) != 0) {
668 warn("error setting CPU freq %d",
669 freqs[0]);
670 }
671 }
672 }
673
674 idle = 0;
675 /* Main loop. */
676 for (;;) {
677 FD_ZERO(&fdset);
678 if (devd_pipe >= 0) {
679 FD_SET(devd_pipe, &fdset);
680 nfds = devd_pipe + 1;
681 } else {
682 nfds = 0;
683 }
684 if (mode == MODE_HIADAPTIVE || idle < 120)
685 to = poll_ival;
686 else if (idle < 360)
687 to = poll_ival * 2;
688 else
689 to = poll_ival * 4;
690 timeout.tv_sec = to / 1000000;
691 timeout.tv_usec = to % 1000000;
692 select(nfds, &fdset, NULL, &fdset, &timeout);
693
694 /* If the user requested we quit, print some statistics. */
695 if (exit_requested) {
696 if (vflag && mjoules_used != 0)
697 printf("total joules used: %u.%03u\n",
698 (u_int)(mjoules_used / 1000),
699 (int)mjoules_used % 1000);
700 break;
701 }
702
703 /* Read the current AC status and record the mode. */
704 acline_read();
705 switch (acline_status) {
706 case SRC_AC:
707 mode = mode_ac;
708 break;
709 case SRC_BATTERY:
710 mode = mode_battery;
711 break;
712 case SRC_UNKNOWN:
713 mode = mode_none;
714 break;
715 default:
716 errx(1, "invalid AC line status %d", acline_status);
717 }
718
719 /* Read the current frequency. */
720 if (idle % 32 == 0) {
721 if ((curfreq = get_freq()) == 0)
722 continue;
723 i = get_freq_id(curfreq, freqs, numfreqs);
724 }
725 idle++;
726 if (vflag) {
727 /* Keep a sum of all power actually used. */
728 if (mwatts[i] != -1)
729 mjoules_used +=
730 (mwatts[i] * (poll_ival / 1000)) / 1000;
731 }
732
733 /* Always switch to the lowest frequency in min mode. */
734 if (mode == MODE_MIN) {
735 freq = freqs[numfreqs - 1];
736 if (curfreq != freq) {
737 if (vflag) {
738 printf("now operating on %s power; "
739 "changing frequency to %d MHz\n",
740 modes[acline_status], freq);
741 }
742 idle = 0;
743 if (set_freq(freq) != 0) {
744 warn("error setting CPU freq %d",
745 freq);
746 continue;
747 }
748 }
749 continue;
750 }
751
752 /* Always switch to the highest frequency in max mode. */
753 if (mode == MODE_MAX) {
754 freq = freqs[0];
755 if (curfreq != freq) {
756 if (vflag) {
757 printf("now operating on %s power; "
758 "changing frequency to %d MHz\n",
759 modes[acline_status], freq);
760 }
761 idle = 0;
762 if (set_freq(freq) != 0) {
763 warn("error setting CPU freq %d",
764 freq);
765 continue;
766 }
767 }
768 continue;
769 }
770
771 /* Adaptive mode; get the current CPU usage times. */
772 if (read_usage_times(&load)) {
773 if (vflag)
774 warn("read_usage_times() failed");
775 continue;
776 }
777
778 if (mode == MODE_ADAPTIVE) {
779 if (load > cpu_running_mark) {
780 if (load > 95 || load > cpu_running_mark * 2)
781 freq *= 2;
782 else
783 freq = freq * load / cpu_running_mark;
784 if (freq > freqs[0])
785 freq = freqs[0];
786 } else if (load < cpu_idle_mark &&
787 curfreq * load < freqs[get_freq_id(
788 freq * 7 / 8, freqs, numfreqs)] *
789 cpu_running_mark) {
790 freq = freq * 7 / 8;
791 if (freq < freqs[numfreqs - 1])
792 freq = freqs[numfreqs - 1];
793 }
794 } else { /* MODE_HIADAPTIVE */
795 if (load > cpu_running_mark / 2) {
796 if (load > 95 || load > cpu_running_mark)
797 freq *= 4;
798 else
799 freq = freq * load * 2 / cpu_running_mark;
800 if (freq > freqs[0] * 2)
801 freq = freqs[0] * 2;
802 } else if (load < cpu_idle_mark / 2 &&
803 curfreq * load < freqs[get_freq_id(
804 freq * 31 / 32, freqs, numfreqs)] *
805 cpu_running_mark / 2) {
806 freq = freq * 31 / 32;
807 if (freq < freqs[numfreqs - 1])
808 freq = freqs[numfreqs - 1];
809 }
810 }
811 if (vflag) {
812 printf("load %3d%%, current freq %4d MHz (%2d), wanted freq %4d MHz\n",
813 load, curfreq, i, freq);
814 }
815 j = get_freq_id(freq, freqs, numfreqs);
816 if (i != j) {
817 if (vflag) {
818 printf("changing clock"
819 " speed from %d MHz to %d MHz\n",
820 freqs[i], freqs[j]);
821 }
822 idle = 0;
823 if (set_freq(freqs[j]))
824 warn("error setting CPU frequency %d",
825 freqs[j]);
826 }
827 }
828 if (set_freq(initfreq))
829 warn("error setting CPU frequency %d", initfreq);
830 free(freqs);
831 free(mwatts);
832 devd_close();
833 if (!vflag)
834 pidfile_remove(pfh);
835
836 exit(0);
837 }
838