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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 <unistd.h>
48
49 #ifdef __i386__
50 #define USE_APM
51 #endif
52
53 #ifdef USE_APM
54 #include <machine/apm_bios.h>
55 #endif
56
57 #define DEFAULT_ACTIVE_PERCENT  75
58 #define DEFAULT_IDLE_PERCENT    50
59 #define DEFAULT_POLL_INTERVAL   250     /* Poll interval in milliseconds */
60
61 typedef enum {
62         MODE_MIN,
63         MODE_ADAPTIVE,
64         MODE_HIADAPTIVE,
65         MODE_MAX,
66 } modes_t;
67
68 typedef enum {
69         SRC_AC,
70         SRC_BATTERY,
71         SRC_UNKNOWN,
72 } power_src_t;
73
74 const char *modes[] = {
75         "AC",
76         "battery",
77         "unknown"
78 };
79
80 #define ACPIAC          "hw.acpi.acline"
81 #define PMUAC           "dev.pmu.0.acline"
82 #define APMDEV          "/dev/apm"
83 #define DEVDPIPE        "/var/run/devd.pipe"
84 #define DEVCTL_MAXBUF   1024
85
86 static int      read_usage_times(int *load);
87 static int      read_freqs(int *numfreqs, int **freqs, int **power,
88                     int minfreq, int maxfreq);
89 static int      set_freq(int freq);
90 static void     acline_init(void);
91 static void     acline_read(void);
92 static int      devd_init(void);
93 static void     devd_close(void);
94 static void     handle_sigs(int sig);
95 static void     parse_mode(char *arg, int *mode, int ch);
96 static void     usage(void);
97
98 /* Sysctl data structures. */
99 static int      cp_times_mib[2];
100 static int      freq_mib[4];
101 static int      levels_mib[4];
102 static int      acline_mib[4];
103 static size_t   acline_mib_len;
104
105 /* Configuration */
106 static int      cpu_running_mark;
107 static int      cpu_idle_mark;
108 static int      poll_ival;
109 static int      vflag;
110
111 static volatile sig_atomic_t exit_requested;
112 static power_src_t acline_status;
113 static enum {
114         ac_none,
115         ac_sysctl,
116         ac_acpi_devd,
117 #ifdef USE_APM
118         ac_apm,
119 #endif
120 } acline_mode;
121 #ifdef USE_APM
122 static int      apm_fd = -1;
123 #endif
124 static int      devd_pipe = -1;
125
126 #define DEVD_RETRY_INTERVAL 60 /* seconds */
127 static struct timeval tried_devd;
128
129 static int
130 read_usage_times(int *load)
131 {
132         static long *cp_times = NULL, *cp_times_old = NULL;
133         static int ncpus = 0;
134         size_t cp_times_len;
135         int error, cpu, i, total;
136
137         if (cp_times == NULL) {
138                 cp_times_len = 0;
139                 error = sysctl(cp_times_mib, 2, NULL, &cp_times_len, NULL, 0);
140                 if (error)
141                         return (error);
142                 if ((cp_times = malloc(cp_times_len)) == NULL)
143                         return (errno);
144                 if ((cp_times_old = malloc(cp_times_len)) == NULL) {
145                         free(cp_times);
146                         cp_times = NULL;
147                         return (errno);
148                 }
149                 ncpus = cp_times_len / (sizeof(long) * CPUSTATES);
150         }
151
152         cp_times_len = sizeof(long) * CPUSTATES * ncpus;
153         error = sysctl(cp_times_mib, 2, cp_times, &cp_times_len, NULL, 0);
154         if (error)
155                 return (error);
156
157         if (load) {
158                 *load = 0;
159                 for (cpu = 0; cpu < ncpus; cpu++) {
160                         total = 0;
161                         for (i = 0; i < CPUSTATES; i++) {
162                             total += cp_times[cpu * CPUSTATES + i] -
163                                 cp_times_old[cpu * CPUSTATES + i];
164                         }
165                         if (total == 0)
166                                 continue;
167                         *load += 100 - (cp_times[cpu * CPUSTATES + CP_IDLE] -
168                             cp_times_old[cpu * CPUSTATES + CP_IDLE]) * 100 / total;
169                 }
170         }
171
172         memcpy(cp_times_old, cp_times, cp_times_len);
173
174         return (0);
175 }
176
177 static int
178 read_freqs(int *numfreqs, int **freqs, int **power, int minfreq, int maxfreq)
179 {
180         char *freqstr, *p, *q;
181         int i, j;
182         size_t len = 0;
183
184         if (sysctl(levels_mib, 4, NULL, &len, NULL, 0))
185                 return (-1);
186         if ((freqstr = malloc(len)) == NULL)
187                 return (-1);
188         if (sysctl(levels_mib, 4, freqstr, &len, NULL, 0))
189                 return (-1);
190
191         *numfreqs = 1;
192         for (p = freqstr; *p != '\0'; p++)
193                 if (*p == ' ')
194                         (*numfreqs)++;
195
196         if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) {
197                 free(freqstr);
198                 return (-1);
199         }
200         if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) {
201                 free(freqstr);
202                 free(*freqs);
203                 return (-1);
204         }
205         for (i = 0, j = 0, p = freqstr; i < *numfreqs; i++) {
206                 q = strchr(p, ' ');
207                 if (q != NULL)
208                         *q = '\0';
209                 if (sscanf(p, "%d/%d", &(*freqs)[j], &(*power)[i]) != 2) {
210                         free(freqstr);
211                         free(*freqs);
212                         free(*power);
213                         return (-1);
214                 }
215                 if (((*freqs)[j] >= minfreq || minfreq == -1) &&
216                     ((*freqs)[j] <= maxfreq || maxfreq == -1))
217                         j++;
218                 p = q + 1;
219         }
220
221         *numfreqs = j;
222         if ((*freqs = realloc(*freqs, *numfreqs * sizeof(int))) == NULL) {
223                 free(freqstr);
224                 free(*freqs);
225                 free(*power);
226                 return (-1);
227         }
228
229         free(freqstr);
230         return (0);
231 }
232
233 static int
234 get_freq(void)
235 {
236         size_t len;
237         int curfreq;
238
239         len = sizeof(curfreq);
240         if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) {
241                 if (vflag)
242                         warn("error reading current CPU frequency");
243                 curfreq = 0;
244         }
245         return (curfreq);
246 }
247
248 static int
249 set_freq(int freq)
250 {
251
252         if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq))) {
253                 if (errno != EPERM)
254                         return (-1);
255         }
256
257         return (0);
258 }
259
260 static int
261 get_freq_id(int freq, int *freqs, int numfreqs)
262 {
263         int i = 1;
264
265         while (i < numfreqs) {
266                 if (freqs[i] < freq)
267                         break;
268                 i++;
269         }
270         return (i - 1);
271 }
272
273 /*
274  * Try to use ACPI to find the AC line status.  If this fails, fall back
275  * to APM.  If nothing succeeds, we'll just run in default mode.
276  */
277 static void
278 acline_init(void)
279 {
280         acline_mib_len = 4;
281
282         if (sysctlnametomib(ACPIAC, acline_mib, &acline_mib_len) == 0) {
283                 acline_mode = ac_sysctl;
284                 if (vflag)
285                         warnx("using sysctl for AC line status");
286 #if __powerpc__
287         } else if (sysctlnametomib(PMUAC, acline_mib, &acline_mib_len) == 0) {
288                 acline_mode = ac_sysctl;
289                 if (vflag)
290                         warnx("using sysctl for AC line status");
291 #endif
292 #ifdef USE_APM
293         } else if ((apm_fd = open(APMDEV, O_RDONLY)) >= 0) {
294                 if (vflag)
295                         warnx("using APM for AC line status");
296                 acline_mode = ac_apm;
297 #endif
298         } else {
299                 warnx("unable to determine AC line status");
300                 acline_mode = ac_none;
301         }
302 }
303
304 static void
305 acline_read(void)
306 {
307         if (acline_mode == ac_acpi_devd) {
308                 char buf[DEVCTL_MAXBUF], *ptr;
309                 ssize_t rlen;
310                 int notify;
311
312                 rlen = read(devd_pipe, buf, sizeof(buf));
313                 if (rlen == 0 || (rlen < 0 && errno != EWOULDBLOCK)) {
314                         if (vflag)
315                                 warnx("lost devd connection, switching to sysctl");
316                         devd_close();
317                         acline_mode = ac_sysctl;
318                         /* FALLTHROUGH */
319                 }
320                 if (rlen > 0 &&
321                     (ptr = strstr(buf, "system=ACPI")) != NULL &&
322                     (ptr = strstr(ptr, "subsystem=ACAD")) != NULL &&
323                     (ptr = strstr(ptr, "notify=")) != NULL &&
324                     sscanf(ptr, "notify=%x", &notify) == 1)
325                         acline_status = (notify ? SRC_AC : SRC_BATTERY);
326         }
327         if (acline_mode == ac_sysctl) {
328                 int acline;
329                 size_t len;
330
331                 len = sizeof(acline);
332                 if (sysctl(acline_mib, acline_mib_len, &acline, &len,
333                     NULL, 0) == 0)
334                         acline_status = (acline ? SRC_AC : SRC_BATTERY);
335                 else
336                         acline_status = SRC_UNKNOWN;
337         }
338 #ifdef USE_APM
339         if (acline_mode == ac_apm) {
340                 struct apm_info info;
341
342                 if (ioctl(apm_fd, APMIO_GETINFO, &info) == 0) {
343                         acline_status = (info.ai_acline ? SRC_AC : SRC_BATTERY);
344                 } else {
345                         close(apm_fd);
346                         apm_fd = -1;
347                         acline_mode = ac_none;
348                         acline_status = SRC_UNKNOWN;
349                 }
350         }
351 #endif
352         /* try to (re)connect to devd */
353         if (acline_mode == ac_sysctl) {
354                 struct timeval now;
355
356                 gettimeofday(&now, NULL);
357                 if (now.tv_sec > tried_devd.tv_sec + DEVD_RETRY_INTERVAL) {
358                         if (devd_init() >= 0) {
359                                 if (vflag)
360                                         warnx("using devd for AC line status");
361                                 acline_mode = ac_acpi_devd;
362                         }
363                         tried_devd = now;
364                 }
365         }
366 }
367
368 static int
369 devd_init(void)
370 {
371         struct sockaddr_un devd_addr;
372
373         bzero(&devd_addr, sizeof(devd_addr));
374         if ((devd_pipe = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
375                 if (vflag)
376                         warn("%s(): socket()", __func__);
377                 return (-1);
378         }
379
380         devd_addr.sun_family = PF_LOCAL;
381         strlcpy(devd_addr.sun_path, DEVDPIPE, sizeof(devd_addr.sun_path));
382         if (connect(devd_pipe, (struct sockaddr *)&devd_addr,
383             sizeof(devd_addr)) == -1) {
384                 if (vflag)
385                         warn("%s(): connect()", __func__);
386                 close(devd_pipe);
387                 devd_pipe = -1;
388                 return (-1);
389         }
390
391         if (fcntl(devd_pipe, F_SETFL, O_NONBLOCK) == -1) {
392                 if (vflag)
393                         warn("%s(): fcntl()", __func__);
394                 close(devd_pipe);
395                 return (-1);
396         }
397
398         return (devd_pipe);
399 }
400
401 static void
402 devd_close(void)
403 {
404
405         close(devd_pipe);
406         devd_pipe = -1;
407 }
408
409 static void
410 parse_mode(char *arg, int *mode, int ch)
411 {
412
413         if (strcmp(arg, "minimum") == 0 || strcmp(arg, "min") == 0)
414                 *mode = MODE_MIN;
415         else if (strcmp(arg, "maximum") == 0 || strcmp(arg, "max") == 0)
416                 *mode = MODE_MAX;
417         else if (strcmp(arg, "adaptive") == 0 || strcmp(arg, "adp") == 0)
418                 *mode = MODE_ADAPTIVE;
419         else if (strcmp(arg, "hiadaptive") == 0 || strcmp(arg, "hadp") == 0)
420                 *mode = MODE_HIADAPTIVE;
421         else
422                 errx(1, "bad option: -%c %s", (char)ch, optarg);
423 }
424
425 static void
426 handle_sigs(int __unused sig)
427 {
428
429         exit_requested = 1;
430 }
431
432 static void
433 usage(void)
434 {
435
436         fprintf(stderr,
437 "usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-n mode] [-p ival] [-r %%] [-P pidfile]\n");
438         exit(1);
439 }
440
441 int
442 main(int argc, char * argv[])
443 {
444         struct timeval timeout;
445         fd_set fdset;
446         int nfds;
447         struct pidfh *pfh = NULL;
448         const char *pidfile = NULL;
449         int freq, curfreq, initfreq, *freqs, i, j, *mwatts, numfreqs, load;
450         int minfreq = -1, maxfreq = -1;
451         int ch, mode, mode_ac, mode_battery, mode_none, idle, to;
452         uint64_t mjoules_used;
453         size_t len;
454
455         /* Default mode for all AC states is adaptive. */
456         mode_ac = mode_none = MODE_HIADAPTIVE;
457         mode_battery = MODE_ADAPTIVE;
458         cpu_running_mark = DEFAULT_ACTIVE_PERCENT;
459         cpu_idle_mark = DEFAULT_IDLE_PERCENT;
460         poll_ival = DEFAULT_POLL_INTERVAL;
461         mjoules_used = 0;
462         vflag = 0;
463
464         /* User must be root to control frequencies. */
465         if (geteuid() != 0)
466                 errx(1, "must be root to run");
467
468         while ((ch = getopt(argc, argv, "a:b:i:m:M:n:p:P:r:v")) != -1)
469                 switch (ch) {
470                 case 'a':
471                         parse_mode(optarg, &mode_ac, ch);
472                         break;
473                 case 'b':
474                         parse_mode(optarg, &mode_battery, ch);
475                         break;
476                 case 'i':
477                         cpu_idle_mark = atoi(optarg);
478                         if (cpu_idle_mark < 0 || cpu_idle_mark > 100) {
479                                 warnx("%d is not a valid percent",
480                                     cpu_idle_mark);
481                                 usage();
482                         }
483                         break;
484                 case 'm':
485                         minfreq = atoi(optarg);
486                         if (minfreq < 0) {
487                                 warnx("%d is not a valid CPU frequency",
488                                     minfreq);
489                                 usage();
490                         }
491                         break;
492                 case 'M':
493                         maxfreq = atoi(optarg);
494                         if (maxfreq < 0) {
495                                 warnx("%d is not a valid CPU frequency",
496                                     maxfreq);
497                                 usage();
498                         }
499                         break;
500                 case 'n':
501                         parse_mode(optarg, &mode_none, ch);
502                         break;
503                 case 'p':
504                         poll_ival = atoi(optarg);
505                         if (poll_ival < 5) {
506                                 warnx("poll interval is in units of ms");
507                                 usage();
508                         }
509                         break;
510                 case 'P':
511                         pidfile = optarg;
512                         break;
513                 case 'r':
514                         cpu_running_mark = atoi(optarg);
515                         if (cpu_running_mark <= 0 || cpu_running_mark > 100) {
516                                 warnx("%d is not a valid percent",
517                                     cpu_running_mark);
518                                 usage();
519                         }
520                         break;
521                 case 'v':
522                         vflag = 1;
523                         break;
524                 default:
525                         usage();
526                 }
527
528         mode = mode_none;
529
530         /* Poll interval is in units of ms. */
531         poll_ival *= 1000;
532
533         /* Look up various sysctl MIBs. */
534         len = 2;
535         if (sysctlnametomib("kern.cp_times", cp_times_mib, &len))
536                 err(1, "lookup kern.cp_times");
537         len = 4;
538         if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len))
539                 err(1, "lookup freq");
540         len = 4;
541         if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len))
542                 err(1, "lookup freq_levels");
543
544         /* Check if we can read the load and supported freqs. */
545         if (read_usage_times(NULL))
546                 err(1, "read_usage_times");
547         if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq))
548                 err(1, "error reading supported CPU frequencies");
549         if (numfreqs == 0)
550                 errx(1, "no CPU frequencies in user-specified range");
551
552         /* Run in the background unless in verbose mode. */
553         if (!vflag) {
554                 pid_t otherpid;
555
556                 pfh = pidfile_open(pidfile, 0600, &otherpid);
557                 if (pfh == NULL) {
558                         if (errno == EEXIST) {
559                                 errx(1, "powerd already running, pid: %d",
560                                     otherpid);
561                         }
562                         warn("cannot open pid file");
563                 }
564                 if (daemon(0, 0) != 0) {
565                         warn("cannot enter daemon mode, exiting");
566                         pidfile_remove(pfh);
567                         exit(EXIT_FAILURE);
568
569                 }
570                 pidfile_write(pfh);
571         }
572
573         /* Decide whether to use ACPI or APM to read the AC line status. */
574         acline_init();
575
576         /*
577          * Exit cleanly on signals.
578          */
579         signal(SIGINT, handle_sigs);
580         signal(SIGTERM, handle_sigs);
581
582         freq = initfreq = curfreq = get_freq();
583         i = get_freq_id(curfreq, freqs, numfreqs);
584         if (freq < 1)
585                 freq = 1;
586
587         /*
588          * If we are in adaptive mode and the current frequency is outside the
589          * user-defined range, adjust it to be within the user-defined range.
590          */
591         acline_read();
592         if (acline_status > SRC_UNKNOWN)
593                 errx(1, "invalid AC line status %d", acline_status);
594         if ((acline_status == SRC_AC &&
595             (mode_ac == MODE_ADAPTIVE || mode_ac == MODE_HIADAPTIVE)) ||
596             (acline_status == SRC_BATTERY &&
597             (mode_battery == MODE_ADAPTIVE || mode_battery == MODE_HIADAPTIVE)) ||
598             (acline_status == SRC_UNKNOWN &&
599             (mode_none == MODE_ADAPTIVE || mode_none == MODE_HIADAPTIVE))) {
600                 /* Read the current frequency. */
601                 len = sizeof(curfreq);
602                 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) {
603                         if (vflag)
604                                 warn("error reading current CPU frequency");
605                 }
606                 if (curfreq < freqs[numfreqs - 1]) {
607                         if (vflag) {
608                                 printf("CPU frequency is below user-defined "
609                                     "minimum; changing frequency to %d "
610                                     "MHz\n", freqs[numfreqs - 1]);
611                         }
612                         if (set_freq(freqs[numfreqs - 1]) != 0) {
613                                 warn("error setting CPU freq %d",
614                                     freqs[numfreqs - 1]);
615                         }
616                 } else if (curfreq > freqs[0]) {
617                         if (vflag) {
618                                 printf("CPU frequency is above user-defined "
619                                     "maximum; changing frequency to %d "
620                                     "MHz\n", freqs[0]);
621                         }
622                         if (set_freq(freqs[0]) != 0) {
623                                 warn("error setting CPU freq %d",
624                                     freqs[0]);
625                         }
626                 }
627         }
628
629         idle = 0;
630         /* Main loop. */
631         for (;;) {
632                 FD_ZERO(&fdset);
633                 if (devd_pipe >= 0) {
634                         FD_SET(devd_pipe, &fdset);
635                         nfds = devd_pipe + 1;
636                 } else {
637                         nfds = 0;
638                 }
639                 if (mode == MODE_HIADAPTIVE || idle < 120)
640                         to = poll_ival;
641                 else if (idle < 360)
642                         to = poll_ival * 2;
643                 else
644                         to = poll_ival * 4;
645                 timeout.tv_sec = to / 1000000;
646                 timeout.tv_usec = to % 1000000;
647                 select(nfds, &fdset, NULL, &fdset, &timeout);
648
649                 /* If the user requested we quit, print some statistics. */
650                 if (exit_requested) {
651                         if (vflag && mjoules_used != 0)
652                                 printf("total joules used: %u.%03u\n",
653                                     (u_int)(mjoules_used / 1000),
654                                     (int)mjoules_used % 1000);
655                         break;
656                 }
657
658                 /* Read the current AC status and record the mode. */
659                 acline_read();
660                 switch (acline_status) {
661                 case SRC_AC:
662                         mode = mode_ac;
663                         break;
664                 case SRC_BATTERY:
665                         mode = mode_battery;
666                         break;
667                 case SRC_UNKNOWN:
668                         mode = mode_none;
669                         break;
670                 default:
671                         errx(1, "invalid AC line status %d", acline_status);
672                 }
673
674                 /* Read the current frequency. */
675                 if (idle % 32 == 0) {
676                         if ((curfreq = get_freq()) == 0)
677                                 continue;
678                         i = get_freq_id(curfreq, freqs, numfreqs);
679                 }
680                 idle++;
681                 if (vflag) {
682                         /* Keep a sum of all power actually used. */
683                         if (mwatts[i] != -1)
684                                 mjoules_used +=
685                                     (mwatts[i] * (poll_ival / 1000)) / 1000;
686                 }
687
688                 /* Always switch to the lowest frequency in min mode. */
689                 if (mode == MODE_MIN) {
690                         freq = freqs[numfreqs - 1];
691                         if (curfreq != freq) {
692                                 if (vflag) {
693                                         printf("now operating on %s power; "
694                                             "changing frequency to %d MHz\n",
695                                             modes[acline_status], freq);
696                                 }
697                                 idle = 0;
698                                 if (set_freq(freq) != 0) {
699                                         warn("error setting CPU freq %d",
700                                             freq);
701                                         continue;
702                                 }
703                         }
704                         continue;
705                 }
706
707                 /* Always switch to the highest frequency in max mode. */
708                 if (mode == MODE_MAX) {
709                         freq = freqs[0];
710                         if (curfreq != freq) {
711                                 if (vflag) {
712                                         printf("now operating on %s power; "
713                                             "changing frequency to %d MHz\n",
714                                             modes[acline_status], freq);
715                                 }
716                                 idle = 0;
717                                 if (set_freq(freq) != 0) {
718                                         warn("error setting CPU freq %d",
719                                             freq);
720                                         continue;
721                                 }
722                         }
723                         continue;
724                 }
725
726                 /* Adaptive mode; get the current CPU usage times. */
727                 if (read_usage_times(&load)) {
728                         if (vflag)
729                                 warn("read_usage_times() failed");
730                         continue;
731                 }
732
733                 if (mode == MODE_ADAPTIVE) {
734                         if (load > cpu_running_mark) {
735                                 if (load > 95 || load > cpu_running_mark * 2)
736                                         freq *= 2;
737                                 else
738                                         freq = freq * load / cpu_running_mark;
739                                 if (freq > freqs[0])
740                                         freq = freqs[0];
741                         } else if (load < cpu_idle_mark &&
742                             curfreq * load < freqs[get_freq_id(
743                             freq * 7 / 8, freqs, numfreqs)] *
744                             cpu_running_mark) {
745                                 freq = freq * 7 / 8;
746                                 if (freq < freqs[numfreqs - 1])
747                                         freq = freqs[numfreqs - 1];
748                         }
749                 } else { /* MODE_HIADAPTIVE */
750                         if (load > cpu_running_mark / 2) {
751                                 if (load > 95 || load > cpu_running_mark)
752                                         freq *= 4;
753                                 else
754                                         freq = freq * load * 2 / cpu_running_mark;
755                                 if (freq > freqs[0] * 2)
756                                         freq = freqs[0] * 2;
757                         } else if (load < cpu_idle_mark / 2 &&
758                             curfreq * load < freqs[get_freq_id(
759                             freq * 31 / 32, freqs, numfreqs)] *
760                             cpu_running_mark / 2) {
761                                 freq = freq * 31 / 32;
762                                 if (freq < freqs[numfreqs - 1])
763                                         freq = freqs[numfreqs - 1];
764                         }
765                 }
766                 if (vflag) {
767                     printf("load %3d%%, current freq %4d MHz (%2d), wanted freq %4d MHz\n",
768                         load, curfreq, i, freq);
769                 }
770                 j = get_freq_id(freq, freqs, numfreqs);
771                 if (i != j) {
772                         if (vflag) {
773                                 printf("changing clock"
774                                     " speed from %d MHz to %d MHz\n",
775                                     freqs[i], freqs[j]);
776                         }
777                         idle = 0;
778                         if (set_freq(freqs[j]))
779                                 warn("error setting CPU frequency %d",
780                                     freqs[j]);
781                 }
782         }
783         if (set_freq(initfreq))
784                 warn("error setting CPU frequency %d", initfreq);
785         free(freqs);
786         free(mwatts);
787         devd_close();
788         if (!vflag)
789                 pidfile_remove(pfh);
790
791         exit(0);
792 }