1 /* vi: set sw=4 ts=4: */
2 /*
3 * A mini 'powertop' utility:
4 * Analyze power consumption on Intel-based laptops.
5 * Based on powertop 1.11.
6 *
7 * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
8 *
9 * Licensed under GPLv2, see file LICENSE in this source tree.
10 */
11
12 //applet:IF_POWERTOP(APPLET(powertop, BB_DIR_USR_SBIN, BB_SUID_DROP))
13
14 //kbuild:lib-$(CONFIG_POWERTOP) += powertop.o
15
16 //config:config POWERTOP
17 //config: bool "powertop"
18 //config: default y
19 //config: help
20 //config: Analyze power consumption on Intel-based laptops
21
22 // XXX This should be configurable
23 #define ENABLE_FEATURE_POWERTOP_PROCIRQ 1
24
25 #include "libbb.h"
26
27
28 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
29 #define debug(fmt, ...) ((void)0)
30
31
32 #define BLOATY_HPET_IRQ_NUM_DETECTION 0
33 #define MAX_CSTATE_COUNT 8
34 #define IRQCOUNT 40
35
36
37 #define DEFAULT_SLEEP 10
38 #define DEFAULT_SLEEP_STR "10"
39
40 /* Frequency of the ACPI timer */
41 #define FREQ_ACPI 3579.545
42 #define FREQ_ACPI_1000 3579545
43
44 /* Max filename length of entry in /sys/devices subsystem */
45 #define BIG_SYSNAME_LEN 16
46
47 typedef unsigned long long ullong;
48
49 struct line {
50 char *string;
51 int count;
52 /*int disk_count;*/
53 };
54
55 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
56 struct irqdata {
57 smallint active;
58 int number;
59 ullong count;
60 char irq_desc[32];
61 };
62 #endif
63
64 struct globals {
65 struct line *lines; /* the most often used member */
66 int lines_cnt;
67 int lines_cumulative_count;
68 int maxcstate;
69 unsigned total_cpus;
70 smallint cant_enable_timer_stats;
71 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
72 # if BLOATY_HPET_IRQ_NUM_DETECTION
73 smallint scanned_timer_list;
74 int percpu_hpet_start;
75 int percpu_hpet_end;
76 # endif
77 int interrupt_0;
78 int total_interrupt;
79 struct irqdata interrupts[IRQCOUNT];
80 #endif
81 ullong start_usage[MAX_CSTATE_COUNT];
82 ullong last_usage[MAX_CSTATE_COUNT];
83 ullong start_duration[MAX_CSTATE_COUNT];
84 ullong last_duration[MAX_CSTATE_COUNT];
85 #if ENABLE_FEATURE_USE_TERMIOS
86 struct termios init_settings;
87 #endif
88 };
89 #define G (*ptr_to_globals)
90 #define INIT_G() do { \
91 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
92 } while (0)
93
94 #if ENABLE_FEATURE_USE_TERMIOS
reset_term(void)95 static void reset_term(void)
96 {
97 tcsetattr_stdin_TCSANOW(&G.init_settings);
98 }
99
sig_handler(int signo UNUSED_PARAM)100 static void sig_handler(int signo UNUSED_PARAM)
101 {
102 reset_term();
103 _exit(EXIT_FAILURE);
104 }
105 #endif
106
write_str_to_file(const char * fname,const char * str)107 static int write_str_to_file(const char *fname, const char *str)
108 {
109 FILE *fp = fopen_for_write(fname);
110 if (!fp)
111 return 1;
112 fputs(str, fp);
113 fclose(fp);
114 return 0;
115 }
116
117 /* Make it more readable */
118 #define start_timer() write_str_to_file("/proc/timer_stats", "1\n")
119 #define stop_timer() write_str_to_file("/proc/timer_stats", "0\n")
120
clear_lines(void)121 static NOINLINE void clear_lines(void)
122 {
123 int i;
124 if (G.lines) {
125 for (i = 0; i < G.lines_cnt; i++)
126 free(G.lines[i].string);
127 free(G.lines);
128 G.lines_cnt = 0;
129 G.lines = NULL;
130 }
131 }
132
update_lines_cumulative_count(void)133 static void update_lines_cumulative_count(void)
134 {
135 int i;
136 for (i = 0; i < G.lines_cnt; i++)
137 G.lines_cumulative_count += G.lines[i].count;
138 }
139
line_compare(const void * p1,const void * p2)140 static int line_compare(const void *p1, const void *p2)
141 {
142 const struct line *a = p1;
143 const struct line *b = p2;
144 return (b->count /*+ 50 * b->disk_count*/) - (a->count /*+ 50 * a->disk_count*/);
145 }
146
sort_lines(void)147 static void sort_lines(void)
148 {
149 qsort(G.lines, G.lines_cnt, sizeof(G.lines[0]), line_compare);
150 }
151
152 /* Save C-state usage and duration. Also update maxcstate. */
read_cstate_counts(ullong * usage,ullong * duration)153 static void read_cstate_counts(ullong *usage, ullong *duration)
154 {
155 DIR *dir;
156 struct dirent *d;
157
158 dir = opendir("/proc/acpi/processor");
159 if (!dir)
160 return;
161
162 while ((d = readdir(dir)) != NULL) {
163 FILE *fp;
164 char buf[192];
165 int level;
166 int len;
167
168 len = strlen(d->d_name); /* "CPUnn" */
169 if (len < 3 || len > BIG_SYSNAME_LEN)
170 continue;
171
172 sprintf(buf, "%s/%s/power", "/proc/acpi/processor", d->d_name);
173 fp = fopen_for_read(buf);
174 if (!fp)
175 continue;
176
177 // Example file contents:
178 // active state: C0
179 // max_cstate: C8
180 // maximum allowed latency: 2000000000 usec
181 // states:
182 // C1: type[C1] promotion[--] demotion[--] latency[001] usage[00006173] duration[00000000000000000000]
183 // C2: type[C2] promotion[--] demotion[--] latency[001] usage[00085191] duration[00000000000083024907]
184 // C3: type[C3] promotion[--] demotion[--] latency[017] usage[01017622] duration[00000000017921327182]
185 level = 0;
186 while (fgets(buf, sizeof(buf), fp)) {
187 char *p = strstr(buf, "age[");
188 if (!p)
189 continue;
190 p += 4;
191 usage[level] += bb_strtoull(p, NULL, 10) + 1;
192 p = strstr(buf, "ation[");
193 if (!p)
194 continue;
195 p += 6;
196 duration[level] += bb_strtoull(p, NULL, 10);
197
198 if (level >= MAX_CSTATE_COUNT-1)
199 break;
200 level++;
201 if (level > G.maxcstate) /* update maxcstate */
202 G.maxcstate = level;
203 }
204 fclose(fp);
205 }
206 closedir(dir);
207 }
208
209 /* Add line and/or update count */
save_line(const char * string,int count)210 static void save_line(const char *string, int count)
211 {
212 int i;
213 for (i = 0; i < G.lines_cnt; i++) {
214 if (strcmp(string, G.lines[i].string) == 0) {
215 /* It's already there, only update count */
216 G.lines[i].count += count;
217 return;
218 }
219 }
220
221 /* Add new line */
222 G.lines = xrealloc_vector(G.lines, 4, G.lines_cnt);
223 G.lines[G.lines_cnt].string = xstrdup(string);
224 G.lines[G.lines_cnt].count = count;
225 /*G.lines[G.lines_cnt].disk_count = 0;*/
226 G.lines_cnt++;
227 }
228
229 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
is_hpet_irq(const char * name)230 static int is_hpet_irq(const char *name)
231 {
232 char *p;
233 # if BLOATY_HPET_IRQ_NUM_DETECTION
234 long hpet_chan;
235
236 /* Learn the range of existing hpet timers. This is done once */
237 if (!G.scanned_timer_list) {
238 FILE *fp;
239 char buf[80];
240
241 G.scanned_timer_list = true;
242 fp = fopen_for_read("/proc/timer_list");
243 if (!fp)
244 return 0;
245
246 while (fgets(buf, sizeof(buf), fp)) {
247 p = strstr(buf, "Clock Event Device: hpet");
248 if (!p)
249 continue;
250 p += sizeof("Clock Event Device: hpet")-1;
251 if (!isdigit(*p))
252 continue;
253 hpet_chan = xatoi_positive(p);
254 if (hpet_chan < G.percpu_hpet_start)
255 G.percpu_hpet_start = hpet_chan;
256 if (hpet_chan > G.percpu_hpet_end)
257 G.percpu_hpet_end = hpet_chan;
258 }
259 fclose(fp);
260 }
261 # endif
262 //TODO: optimize
263 p = strstr(name, "hpet");
264 if (!p)
265 return 0;
266 p += 4;
267 if (!isdigit(*p))
268 return 0;
269 # if BLOATY_HPET_IRQ_NUM_DETECTION
270 hpet_chan = xatoi_positive(p);
271 if (hpet_chan < G.percpu_hpet_start || hpet_chan > G.percpu_hpet_end)
272 return 0;
273 # endif
274 return 1;
275 }
276
277 /* Save new IRQ count, return delta from old one */
save_irq_count(int irq,ullong count)278 static int save_irq_count(int irq, ullong count)
279 {
280 int unused = IRQCOUNT;
281 int i;
282 for (i = 0; i < IRQCOUNT; i++) {
283 if (G.interrupts[i].active && G.interrupts[i].number == irq) {
284 ullong old = G.interrupts[i].count;
285 G.interrupts[i].count = count;
286 return count - old;
287 }
288 if (!G.interrupts[i].active && unused > i)
289 unused = i;
290 }
291 if (unused < IRQCOUNT) {
292 G.interrupts[unused].active = 1;
293 G.interrupts[unused].count = count;
294 G.interrupts[unused].number = irq;
295 }
296 return count;
297 }
298
299 /* Read /proc/interrupts, save IRQ counts and IRQ description */
process_irq_counts(void)300 static void process_irq_counts(void)
301 {
302 FILE *fp;
303 char buf[128];
304
305 /* Reset values */
306 G.interrupt_0 = 0;
307 G.total_interrupt = 0;
308
309 fp = xfopen_for_read("/proc/interrupts");
310 while (fgets(buf, sizeof(buf), fp)) {
311 char irq_desc[sizeof(" <kernel IPI> : ") + sizeof(buf)];
312 char *p;
313 const char *name;
314 int nr;
315 ullong count;
316 ullong delta;
317
318 p = strchr(buf, ':');
319 if (!p)
320 continue;
321 /* 0: 143646045 153901007 IO-APIC-edge timer
322 * ^
323 */
324 *p = '\0';
325 /* Deal with non-maskable interrupts -- make up fake numbers */
326 nr = index_in_strings("NMI\0RES\0CAL\0TLB\0TRM\0THR\0SPU\0", buf);
327 if (nr >= 0) {
328 nr += 20000;
329 } else {
330 /* bb_strtou doesn't eat leading spaces, using strtoul */
331 errno = 0;
332 nr = strtoul(buf, NULL, 10);
333 if (errno)
334 continue;
335 }
336 p++;
337 /* 0: 143646045 153901007 IO-APIC-edge timer
338 * ^
339 */
340 /* Sum counts for this IRQ */
341 count = 0;
342 while (1) {
343 char *tmp;
344 p = skip_whitespace(p);
345 if (!isdigit(*p))
346 break;
347 count += bb_strtoull(p, &tmp, 10);
348 p = tmp;
349 }
350 /* 0: 143646045 153901007 IO-APIC-edge timer
351 * NMI: 1 2 Non-maskable interrupts
352 * ^
353 */
354 if (nr < 20000) {
355 /* Skip to the interrupt name, e.g. 'timer' */
356 p = strchr(p, ' ');
357 if (!p)
358 continue;
359 p = skip_whitespace(p);
360 }
361
362 name = p;
363 chomp(p);
364 /* Save description of the interrupt */
365 if (nr >= 20000)
366 sprintf(irq_desc, " <kernel IPI> : %s", name);
367 else
368 sprintf(irq_desc, " <interrupt> : %s", name);
369
370 delta = save_irq_count(nr, count);
371
372 /* Skip per CPU timer interrupts */
373 if (is_hpet_irq(name))
374 continue;
375
376 if (nr != 0 && delta != 0)
377 save_line(irq_desc, delta);
378
379 if (nr == 0)
380 G.interrupt_0 = delta;
381 else
382 G.total_interrupt += delta;
383 }
384
385 fclose(fp);
386 }
387 #else /* !ENABLE_FEATURE_POWERTOP_PROCIRQ */
388 # define process_irq_counts() ((void)0)
389 #endif
390
process_timer_stats(void)391 static NOINLINE int process_timer_stats(void)
392 {
393 char buf[128];
394 char line[15 + 3 + 128];
395 int n;
396 FILE *fp;
397
398 buf[0] = '\0';
399
400 n = 0;
401 fp = NULL;
402 if (!G.cant_enable_timer_stats)
403 fp = fopen_for_read("/proc/timer_stats");
404 if (fp) {
405 // Example file contents:
406 // Timer Stats Version: v0.2
407 // Sample period: 1.329 s
408 // 76, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
409 // 88, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
410 // 24, 3787 firefox hrtimer_start_range_ns (hrtimer_wakeup)
411 // 46D, 1136 kondemand/1 do_dbs_timer (delayed_work_timer_fn)
412 // ...
413 // 1, 1656 Xorg hrtimer_start_range_ns (hrtimer_wakeup)
414 // 1, 2159 udisks-daemon hrtimer_start_range_ns (hrtimer_wakeup)
415 // 331 total events, 249.059 events/sec
416 while (fgets(buf, sizeof(buf), fp)) {
417 const char *count, *process, *func;
418 char *p;
419 int idx;
420 unsigned cnt;
421
422 count = skip_whitespace(buf);
423 p = strchr(count, ',');
424 if (!p)
425 continue;
426 *p++ = '\0';
427 cnt = bb_strtou(count, NULL, 10);
428 if (strcmp(skip_non_whitespace(count), " total events") == 0) {
429 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
430 n = cnt / G.total_cpus;
431 if (n > 0 && n < G.interrupt_0) {
432 sprintf(line, " <interrupt> : %s", "extra timer interrupt");
433 save_line(line, G.interrupt_0 - n);
434 }
435 #endif
436 break;
437 }
438 if (strchr(count, 'D'))
439 continue; /* deferred */
440 p = skip_whitespace(p); /* points to pid now */
441 process = NULL;
442 get_func_name:
443 p = strchr(p, ' ');
444 if (!p)
445 continue;
446 *p++ = '\0';
447 p = skip_whitespace(p);
448 if (process == NULL) {
449 process = p;
450 goto get_func_name;
451 }
452 func = p;
453
454 //if (strcmp(process, "swapper") == 0
455 // && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
456 //) {
457 // process = "[kernel scheduler]";
458 // func = "Load balancing tick";
459 //}
460
461 if (is_prefixed_with(func, "tick_nohz_"))
462 continue;
463 if (is_prefixed_with(func, "tick_setup_sched_timer"))
464 continue;
465 //if (strcmp(process, "powertop") == 0)
466 // continue;
467
468 idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
469 if (idx != -1) {
470 process = idx < 2 ? "[kernel module]" : "<kernel core>";
471 }
472
473 chomp(p);
474
475 // 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
476 // ^ ^ ^
477 // count process func
478
479 //if (strchr(process, '['))
480 sprintf(line, "%15.15s : %s", process, func);
481 //else
482 // sprintf(line, "%s", process);
483 save_line(line, cnt);
484 }
485 fclose(fp);
486 }
487
488 return n;
489 }
490
491 #ifdef __i386__
492 /*
493 * Get information about CPU using CPUID opcode.
494 */
cpuid(unsigned int * eax,unsigned int * ebx,unsigned int * ecx,unsigned int * edx)495 static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
496 unsigned int *edx)
497 {
498 /* EAX value specifies what information to return */
499 __asm__(
500 " pushl %%ebx\n" /* Save EBX */
501 " cpuid\n"
502 " movl %%ebx, %1\n" /* Save content of EBX */
503 " popl %%ebx\n" /* Restore EBX */
504 : "=a"(*eax), /* Output */
505 "=r"(*ebx),
506 "=c"(*ecx),
507 "=d"(*edx)
508 : "0"(*eax), /* Input */
509 "1"(*ebx),
510 "2"(*ecx),
511 "3"(*edx)
512 /* No clobbered registers */
513 );
514 }
515 #endif
516
517 #ifdef __i386__
print_intel_cstates(void)518 static NOINLINE void print_intel_cstates(void)
519 {
520 int bios_table[8] = { 0 };
521 int nbios = 0;
522 DIR *cpudir;
523 struct dirent *d;
524 int i;
525 unsigned eax, ebx, ecx, edx;
526
527 cpudir = opendir("/sys/devices/system/cpu");
528 if (!cpudir)
529 return;
530
531 /* Loop over cpuN entries */
532 while ((d = readdir(cpudir)) != NULL) {
533 DIR *dir;
534 int len;
535 char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
536
537 len = strlen(d->d_name);
538 if (len < 3 || len > BIG_SYSNAME_LEN)
539 continue;
540
541 if (!isdigit(d->d_name[3]))
542 continue;
543
544 len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
545 dir = opendir(fname);
546 if (!dir)
547 continue;
548
549 /*
550 * Every C-state has its own stateN directory, that
551 * contains a 'time' and a 'usage' file.
552 */
553 while ((d = readdir(dir)) != NULL) {
554 FILE *fp;
555 char buf[64];
556 int n;
557
558 n = strlen(d->d_name);
559 if (n < 3 || n > BIG_SYSNAME_LEN)
560 continue;
561
562 sprintf(fname + len, "/%s/desc", d->d_name);
563 fp = fopen_for_read(fname);
564 if (fp) {
565 char *p = fgets(buf, sizeof(buf), fp);
566 fclose(fp);
567 if (!p)
568 break;
569 p = strstr(p, "MWAIT ");
570 if (p) {
571 int pos;
572 p += sizeof("MWAIT ") - 1;
573 pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
574 if (pos >= ARRAY_SIZE(bios_table))
575 continue;
576 bios_table[pos]++;
577 nbios++;
578 }
579 }
580 }
581 closedir(dir);
582 }
583 closedir(cpudir);
584
585 if (!nbios)
586 return;
587
588 eax = 5;
589 ebx = ecx = edx = 0;
590 cpuid(&eax, &ebx, &ecx, &edx);
591 if (!edx || !(ecx & 1))
592 return;
593
594 printf("Your %s the following C-states: ", "CPU supports");
595 i = 0;
596 while (edx) {
597 if (edx & 7)
598 printf("C%u ", i);
599 edx >>= 4;
600 i++;
601 }
602 bb_putchar('\n');
603
604 /* Print BIOS C-States */
605 printf("Your %s the following C-states: ", "BIOS reports");
606 for (i = 0; i < ARRAY_SIZE(bios_table); i++)
607 if (bios_table[i])
608 printf("C%u ", i);
609
610 bb_putchar('\n');
611 }
612 #else
613 # define print_intel_cstates() ((void)0)
614 #endif
615
show_timerstats(void)616 static void show_timerstats(void)
617 {
618 unsigned lines;
619
620 /* Get terminal height */
621 get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
622
623 /* We don't have whole terminal just for timerstats */
624 lines -= 12;
625
626 if (!G.cant_enable_timer_stats) {
627 int i, n = 0;
628 char strbuf6[6];
629
630 puts("\nTop causes for wakeups:");
631 for (i = 0; i < G.lines_cnt; i++) {
632 if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
633 && n++ < lines
634 ) {
635 /* NB: upstream powertop prints "(wakeups/sec)",
636 * we print just "(wakeup counts)".
637 */
638 /*char c = ' ';
639 if (G.lines[i].disk_count)
640 c = 'D';*/
641 smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY")[0] = '\0';
642 printf(/*" %5.1f%% (%s)%c %s\n"*/
643 " %5.1f%% (%s) %s\n",
644 G.lines[i].count * 100.0 / G.lines_cumulative_count,
645 strbuf6, /*c,*/
646 G.lines[i].string);
647 }
648 }
649 } else {
650 bb_putchar('\n');
651 bb_error_msg("no stats available; run as root or"
652 " enable the timer_stats module");
653 }
654 }
655
656 // Example display from powertop version 1.11
657 // Cn Avg residency P-states (frequencies)
658 // C0 (cpu running) ( 0.5%) 2.00 Ghz 0.0%
659 // polling 0.0ms ( 0.0%) 1.67 Ghz 0.0%
660 // C1 mwait 0.0ms ( 0.0%) 1333 Mhz 0.1%
661 // C2 mwait 0.1ms ( 0.1%) 1000 Mhz 99.9%
662 // C3 mwait 12.1ms (99.4%)
663 //
664 // Wakeups-from-idle per second : 93.6 interval: 15.0s
665 // no ACPI power usage estimate available
666 //
667 // Top causes for wakeups:
668 // 32.4% ( 26.7) <interrupt> : extra timer interrupt
669 // 29.0% ( 23.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
670 // 9.0% ( 7.5) <kernel core> : hrtimer_start (tick_sched_timer)
671 // 6.5% ( 5.3) <interrupt> : ata_piix
672 // 5.0% ( 4.1) inetd : hrtimer_start_range_ns (hrtimer_wakeup)
673
674 //usage:#define powertop_trivial_usage
675 //usage: ""
676 //usage:#define powertop_full_usage "\n\n"
677 //usage: "Analyze power consumption on Intel-based laptops"
678
679 int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
powertop_main(int UNUSED_PARAM argc,char UNUSED_PARAM ** argv)680 int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
681 {
682 ullong cur_usage[MAX_CSTATE_COUNT];
683 ullong cur_duration[MAX_CSTATE_COUNT];
684 char cstate_lines[MAX_CSTATE_COUNT + 2][64];
685 #if ENABLE_FEATURE_USE_TERMIOS
686 struct termios new_settings;
687 struct pollfd pfd[1];
688
689 pfd[0].fd = 0;
690 pfd[0].events = POLLIN;
691 #endif
692
693 INIT_G();
694
695 #if ENABLE_FEATURE_POWERTOP_PROCIRQ && BLOATY_HPET_IRQ_NUM_DETECTION
696 G.percpu_hpet_start = INT_MAX;
697 G.percpu_hpet_end = INT_MIN;
698 #endif
699
700 /* Print warning when we don't have superuser privileges */
701 if (geteuid() != 0)
702 bb_error_msg("run as root to collect enough information");
703
704 /* Get number of CPUs */
705 G.total_cpus = get_cpu_count();
706
707 puts("Collecting data for "DEFAULT_SLEEP_STR" seconds");
708
709 #if ENABLE_FEATURE_USE_TERMIOS
710 tcgetattr(0, (void *)&G.init_settings);
711 memcpy(&new_settings, &G.init_settings, sizeof(new_settings));
712 /* Turn on unbuffered input, turn off echoing */
713 new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
714 /* So we don't forget to reset term settings */
715 atexit(reset_term);
716 bb_signals(BB_FATAL_SIGS, sig_handler);
717 tcsetattr_stdin_TCSANOW(&new_settings);
718 #endif
719
720 /* Collect initial data */
721 process_irq_counts();
722
723 /* Read initial usage and duration */
724 read_cstate_counts(G.start_usage, G.start_duration);
725
726 /* Copy them to "last" */
727 memcpy(G.last_usage, G.start_usage, sizeof(G.last_usage));
728 memcpy(G.last_duration, G.start_duration, sizeof(G.last_duration));
729
730 /* Display C-states */
731 print_intel_cstates();
732
733 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
734
735 /* The main loop */
736 for (;;) {
737 //double maxsleep = 0.0;
738 ullong totalticks, totalevents;
739 int i;
740
741 G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
742 #if !ENABLE_FEATURE_USE_TERMIOS
743 sleep(DEFAULT_SLEEP);
744 #else
745 if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
746 unsigned char c;
747 if (safe_read(STDIN_FILENO, &c, 1) != 1)
748 break; /* EOF/error */
749 if (c == G.init_settings.c_cc[VINTR])
750 break; /* ^C */
751 if ((c | 0x20) == 'q')
752 break;
753 }
754 #endif
755 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
756
757 clear_lines();
758 process_irq_counts();
759
760 /* Clear the stats */
761 memset(cur_duration, 0, sizeof(cur_duration));
762 memset(cur_usage, 0, sizeof(cur_usage));
763
764 /* Read them */
765 read_cstate_counts(cur_usage, cur_duration);
766
767 /* Count totalticks and totalevents */
768 totalticks = totalevents = 0;
769 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
770 if (cur_usage[i] != 0) {
771 totalticks += cur_duration[i] - G.last_duration[i];
772 totalevents += cur_usage[i] - G.last_usage[i];
773 }
774 }
775
776 /* Clear the screen */
777 printf("\033[H\033[J");
778
779 /* Clear C-state lines */
780 memset(&cstate_lines, 0, sizeof(cstate_lines));
781
782 if (totalevents == 0 && G.maxcstate <= 1) {
783 /* This should not happen */
784 strcpy(cstate_lines[0], "C-state information is not available\n");
785 } else {
786 double percentage;
787 unsigned newticks;
788
789 newticks = G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000 - totalticks;
790 /* Handle rounding errors: do not display negative values */
791 if ((int)newticks < 0)
792 newticks = 0;
793
794 sprintf(cstate_lines[0], "Cn\t\t Avg residency\n");
795 percentage = newticks * 100.0 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
796 sprintf(cstate_lines[1], "C0 (cpu running) (%4.1f%%)\n", percentage);
797
798 /* Compute values for individual C-states */
799 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
800 if (cur_usage[i] != 0) {
801 double slept;
802 slept = (cur_duration[i] - G.last_duration[i])
803 / (cur_usage[i] - G.last_usage[i] + 0.1) / FREQ_ACPI;
804 percentage = (cur_duration[i] - G.last_duration[i]) * 100
805 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
806 sprintf(cstate_lines[i + 2], "C%u\t\t%5.1fms (%4.1f%%)\n",
807 i + 1, slept, percentage);
808 //if (maxsleep < slept)
809 // maxsleep = slept;
810 }
811 }
812 }
813
814 for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
815 if (cstate_lines[i][0])
816 fputs(cstate_lines[i], stdout);
817
818 i = process_timer_stats();
819 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
820 if (totalevents == 0) {
821 /* No C-state info available, use timerstats */
822 totalevents = i * G.total_cpus + G.total_interrupt;
823 if (i < 0)
824 totalevents += G.interrupt_0 - i;
825 }
826 #endif
827 /* Upstream powertop prints wakeups per sec per CPU,
828 * we print just raw wakeup counts.
829 */
830 //TODO: show real seconds (think about manual refresh)
831 printf("\nWakeups-from-idle in %u seconds: %llu\n",
832 DEFAULT_SLEEP,
833 totalevents
834 );
835
836 update_lines_cumulative_count();
837 sort_lines();
838 show_timerstats();
839 fflush(stdout);
840
841 /* Clear the stats */
842 memset(cur_duration, 0, sizeof(cur_duration));
843 memset(cur_usage, 0, sizeof(cur_usage));
844
845 /* Get new values */
846 read_cstate_counts(cur_usage, cur_duration);
847
848 /* Save them */
849 memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
850 memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));
851 } /* for (;;) */
852
853 bb_putchar('\n');
854
855 return EXIT_SUCCESS;
856 }
857