source: MondoRescue/branches/3.0/mindi-busybox/procps/powertop.c@ 2899

Last change on this file since 2899 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 20.6 KB
Line 
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_BIN, _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
47typedef unsigned long long ullong;
48
49struct line {
50 char *string;
51 int count;
52 /*int disk_count;*/
53};
54
55#if ENABLE_FEATURE_POWERTOP_PROCIRQ
56struct irqdata {
57 smallint active;
58 int number;
59 ullong count;
60 char irq_desc[32];
61};
62#endif
63
64struct 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
95static void reset_term(void)
96{
97 tcsetattr_stdin_TCSANOW(&G.init_settings);
98}
99
100static void sig_handler(int signo UNUSED_PARAM)
101{
102 reset_term();
103 _exit(EXIT_FAILURE);
104}
105#endif
106
107static 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
121static 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
133static 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
140static 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
147static 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. */
153static 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 */
210static 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
230static 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 */
278static 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 */
300static 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 strchrnul(name, '\n')[0] = '\0';
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
391static NOINLINE int process_timer_stats(void)
392{
393 char buf[128];
394 char line[15 + 3 + 128];
395 int n;
396 ullong totalticks;
397 FILE *fp;
398
399 buf[0] = '\0';
400 totalticks = 0;
401
402 n = 0;
403 fp = NULL;
404 if (!G.cant_enable_timer_stats)
405 fp = fopen_for_read("/proc/timer_stats");
406 if (fp) {
407// Example file contents:
408// Timer Stats Version: v0.2
409// Sample period: 1.329 s
410// 76, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
411// 88, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
412// 24, 3787 firefox hrtimer_start_range_ns (hrtimer_wakeup)
413// 46D, 1136 kondemand/1 do_dbs_timer (delayed_work_timer_fn)
414// ...
415// 1, 1656 Xorg hrtimer_start_range_ns (hrtimer_wakeup)
416// 1, 2159 udisks-daemon hrtimer_start_range_ns (hrtimer_wakeup)
417// 331 total events, 249.059 events/sec
418 while (fgets(buf, sizeof(buf), fp)) {
419 const char *count, *process, *func;
420 char *p;
421 int idx;
422 unsigned cnt;
423
424 count = skip_whitespace(buf);
425 p = strchr(count, ',');
426 if (!p)
427 continue;
428 *p++ = '\0';
429 cnt = bb_strtou(count, NULL, 10);
430 if (strcmp(skip_non_whitespace(count), " total events") == 0) {
431#if ENABLE_FEATURE_POWERTOP_PROCIRQ
432 n = cnt / G.total_cpus;
433 if (n > 0 && n < G.interrupt_0) {
434 sprintf(line, " <interrupt> : %s", "extra timer interrupt");
435 save_line(line, G.interrupt_0 - n);
436 }
437#endif
438 break;
439 }
440 if (strchr(count, 'D'))
441 continue; /* deferred */
442 p = skip_whitespace(p); /* points to pid now */
443 process = NULL;
444 get_func_name:
445 p = strchr(p, ' ');
446 if (!p)
447 continue;
448 *p++ = '\0';
449 p = skip_whitespace(p);
450 if (process == NULL) {
451 process = p;
452 goto get_func_name;
453 }
454 func = p;
455
456 //if (strcmp(process, "swapper") == 0
457 // && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
458 //) {
459 // process = "[kernel scheduler]";
460 // func = "Load balancing tick";
461 //}
462
463 if (strncmp(func, "tick_nohz_", 10) == 0)
464 continue;
465 if (strncmp(func, "tick_setup_sched_timer", 20) == 0)
466 continue;
467 //if (strcmp(process, "powertop") == 0)
468 // continue;
469
470 idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
471 if (idx != -1) {
472 process = idx < 2 ? "[kernel module]" : "<kernel core>";
473 }
474
475 strchrnul(p, '\n')[0] = '\0';
476
477 // 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
478 // ^ ^ ^
479 // count process func
480
481 //if (strchr(process, '['))
482 sprintf(line, "%15.15s : %s", process, func);
483 //else
484 // sprintf(line, "%s", process);
485 save_line(line, cnt);
486 }
487 fclose(fp);
488 }
489
490 return n;
491}
492
493#ifdef __i386__
494/*
495 * Get information about CPU using CPUID opcode.
496 */
497static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
498 unsigned int *edx)
499{
500 /* EAX value specifies what information to return */
501 __asm__(
502 " pushl %%ebx\n" /* Save EBX */
503 " cpuid\n"
504 " movl %%ebx, %1\n" /* Save content of EBX */
505 " popl %%ebx\n" /* Restore EBX */
506 : "=a"(*eax), /* Output */
507 "=r"(*ebx),
508 "=c"(*ecx),
509 "=d"(*edx)
510 : "0"(*eax), /* Input */
511 "1"(*ebx),
512 "2"(*ecx),
513 "3"(*edx)
514 /* No clobbered registers */
515 );
516}
517#endif
518
519#ifdef __i386__
520static NOINLINE void print_intel_cstates(void)
521{
522 int bios_table[8] = { 0 };
523 int nbios = 0;
524 DIR *cpudir;
525 struct dirent *d;
526 int i;
527 unsigned eax, ebx, ecx, edx;
528
529 cpudir = opendir("/sys/devices/system/cpu");
530 if (!cpudir)
531 return;
532
533 /* Loop over cpuN entries */
534 while ((d = readdir(cpudir)) != NULL) {
535 DIR *dir;
536 int len;
537 char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
538
539 len = strlen(d->d_name);
540 if (len < 3 || len > BIG_SYSNAME_LEN)
541 continue;
542
543 if (!isdigit(d->d_name[3]))
544 continue;
545
546 len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
547 dir = opendir(fname);
548 if (!dir)
549 continue;
550
551 /*
552 * Every C-state has its own stateN directory, that
553 * contains a 'time' and a 'usage' file.
554 */
555 while ((d = readdir(dir)) != NULL) {
556 FILE *fp;
557 char buf[64];
558 int n;
559
560 n = strlen(d->d_name);
561 if (n < 3 || n > BIG_SYSNAME_LEN)
562 continue;
563
564 sprintf(fname + len, "/%s/desc", d->d_name);
565 fp = fopen_for_read(fname);
566 if (fp) {
567 char *p = fgets(buf, sizeof(buf), fp);
568 fclose(fp);
569 if (!p)
570 break;
571 p = strstr(p, "MWAIT ");
572 if (p) {
573 int pos;
574 p += sizeof("MWAIT ") - 1;
575 pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
576 if (pos >= ARRAY_SIZE(bios_table))
577 continue;
578 bios_table[pos]++;
579 nbios++;
580 }
581 }
582 }
583 closedir(dir);
584 }
585 closedir(cpudir);
586
587 if (!nbios)
588 return;
589
590 eax = 5;
591 ebx = ecx = edx = 0;
592 cpuid(&eax, &ebx, &ecx, &edx);
593 if (!edx || !(ecx & 1))
594 return;
595
596 printf("Your CPU supports the following C-states: ");
597 i = 0;
598 while (edx) {
599 if (edx & 7)
600 printf("C%u ", i);
601 edx >>= 4;
602 i++;
603 }
604 bb_putchar('\n');
605
606 /* Print BIOS C-States */
607 printf("Your BIOS reports the following C-states: ");
608 for (i = 0; i < ARRAY_SIZE(bios_table); i++)
609 if (bios_table[i])
610 printf("C%u ", i);
611
612 bb_putchar('\n');
613}
614#else
615# define print_intel_cstates() ((void)0)
616#endif
617
618static void show_timerstats(void)
619{
620 unsigned lines;
621
622 /* Get terminal height */
623 get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
624
625 /* We don't have whole terminal just for timerstats */
626 lines -= 12;
627
628 if (!G.cant_enable_timer_stats) {
629 int i, n = 0;
630 char strbuf6[6];
631
632 strbuf6[5] = '\0';
633 puts("\nTop causes for wakeups:");
634 for (i = 0; i < G.lines_cnt; i++) {
635 if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
636 && n++ < lines
637 ) {
638 /* NB: upstream powertop prints "(wakeups/sec)",
639 * we print just "(wakeup counts)".
640 */
641 /*char c = ' ';
642 if (G.lines[i].disk_count)
643 c = 'D';*/
644 smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY");
645 printf(/*" %5.1f%% (%s)%c %s\n"*/
646 " %5.1f%% (%s) %s\n",
647 G.lines[i].count * 100.0 / G.lines_cumulative_count,
648 strbuf6, /*c,*/
649 G.lines[i].string);
650 }
651 }
652 } else {
653 bb_putchar('\n');
654 bb_error_msg("no stats available; run as root or"
655 " enable the cpufreq_stats module");
656 }
657}
658
659// Example display from powertop version 1.11
660// Cn Avg residency P-states (frequencies)
661// C0 (cpu running) ( 0.5%) 2.00 Ghz 0.0%
662// polling 0.0ms ( 0.0%) 1.67 Ghz 0.0%
663// C1 mwait 0.0ms ( 0.0%) 1333 Mhz 0.1%
664// C2 mwait 0.1ms ( 0.1%) 1000 Mhz 99.9%
665// C3 mwait 12.1ms (99.4%)
666//
667// Wakeups-from-idle per second : 93.6 interval: 15.0s
668// no ACPI power usage estimate available
669//
670// Top causes for wakeups:
671// 32.4% ( 26.7) <interrupt> : extra timer interrupt
672// 29.0% ( 23.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
673// 9.0% ( 7.5) <kernel core> : hrtimer_start (tick_sched_timer)
674// 6.5% ( 5.3) <interrupt> : ata_piix
675// 5.0% ( 4.1) inetd : hrtimer_start_range_ns (hrtimer_wakeup)
676
677//usage:#define powertop_trivial_usage
678//usage: ""
679//usage:#define powertop_full_usage "\n\n"
680//usage: "Analyze power consumption on Intel-based laptops\n"
681
682int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
683int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
684{
685 ullong cur_usage[MAX_CSTATE_COUNT];
686 ullong cur_duration[MAX_CSTATE_COUNT];
687 char cstate_lines[MAX_CSTATE_COUNT + 2][64];
688#if ENABLE_FEATURE_USE_TERMIOS
689 struct termios new_settings;
690 struct pollfd pfd[1];
691
692 pfd[0].fd = 0;
693 pfd[0].events = POLLIN;
694#endif
695
696 INIT_G();
697
698#if ENABLE_FEATURE_POWERTOP_PROCIRQ && BLOATY_HPET_IRQ_NUM_DETECTION
699 G.percpu_hpet_start = INT_MAX;
700 G.percpu_hpet_end = INT_MIN;
701#endif
702
703 /* Print warning when we don't have superuser privileges */
704 if (geteuid() != 0)
705 bb_error_msg("run as root to collect enough information");
706
707 /* Get number of CPUs */
708 G.total_cpus = get_cpu_count();
709
710 printf("Collecting data for "DEFAULT_SLEEP_STR" seconds\n");
711
712#if ENABLE_FEATURE_USE_TERMIOS
713 tcgetattr(0, (void *)&G.init_settings);
714 memcpy(&new_settings, &G.init_settings, sizeof(new_settings));
715 /* Turn on unbuffered input, turn off echoing */
716 new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
717 /* So we don't forget to reset term settings */
718 atexit(reset_term);
719 bb_signals(BB_FATAL_SIGS, sig_handler);
720 tcsetattr_stdin_TCSANOW(&new_settings);
721#endif
722
723 /* Collect initial data */
724 process_irq_counts();
725
726 /* Read initial usage and duration */
727 read_cstate_counts(G.start_usage, G.start_duration);
728
729 /* Copy them to "last" */
730 memcpy(G.last_usage, G.start_usage, sizeof(G.last_usage));
731 memcpy(G.last_duration, G.start_duration, sizeof(G.last_duration));
732
733 /* Display C-states */
734 print_intel_cstates();
735
736 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
737
738 /* The main loop */
739 for (;;) {
740 //double maxsleep = 0.0;
741 ullong totalticks, totalevents;
742 int i;
743
744 G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
745#if !ENABLE_FEATURE_USE_TERMIOS
746 sleep(DEFAULT_SLEEP);
747#else
748 if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
749 unsigned char c;
750 if (safe_read(STDIN_FILENO, &c, 1) != 1)
751 break; /* EOF/error */
752 if (c == G.init_settings.c_cc[VINTR])
753 break; /* ^C */
754 if ((c | 0x20) == 'q')
755 break;
756 }
757#endif
758 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
759
760 clear_lines();
761 process_irq_counts();
762
763 /* Clear the stats */
764 memset(cur_duration, 0, sizeof(cur_duration));
765 memset(cur_usage, 0, sizeof(cur_usage));
766
767 /* Read them */
768 read_cstate_counts(cur_usage, cur_duration);
769
770 /* Count totalticks and totalevents */
771 totalticks = totalevents = 0;
772 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
773 if (cur_usage[i] != 0) {
774 totalticks += cur_duration[i] - G.last_duration[i];
775 totalevents += cur_usage[i] - G.last_usage[i];
776 }
777 }
778
779 /* Clear the screen */
780 printf("\033[H\033[J");
781
782 /* Clear C-state lines */
783 memset(&cstate_lines, 0, sizeof(cstate_lines));
784
785 if (totalevents == 0 && G.maxcstate <= 1) {
786 /* This should not happen */
787 strcpy(cstate_lines[0], "C-state information is not available\n");
788 } else {
789 double percentage;
790 unsigned newticks;
791
792 newticks = G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000 - totalticks;
793 /* Handle rounding errors: do not display negative values */
794 if ((int)newticks < 0)
795 newticks = 0;
796
797 sprintf(cstate_lines[0], "Cn\t\t Avg residency\n");
798 percentage = newticks * 100.0 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
799 sprintf(cstate_lines[1], "C0 (cpu running) (%4.1f%%)\n", percentage);
800
801 /* Compute values for individual C-states */
802 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
803 if (cur_usage[i] != 0) {
804 double slept;
805 slept = (cur_duration[i] - G.last_duration[i])
806 / (cur_usage[i] - G.last_usage[i] + 0.1) / FREQ_ACPI;
807 percentage = (cur_duration[i] - G.last_duration[i]) * 100
808 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
809 sprintf(cstate_lines[i + 2], "C%u\t\t%5.1fms (%4.1f%%)\n",
810 i + 1, slept, percentage);
811 //if (maxsleep < slept)
812 // maxsleep = slept;
813 }
814 }
815 }
816
817 for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
818 if (cstate_lines[i][0])
819 fputs(cstate_lines[i], stdout);
820
821 i = process_timer_stats();
822#if ENABLE_FEATURE_POWERTOP_PROCIRQ
823 if (totalevents == 0) {
824 /* No C-state info available, use timerstats */
825 totalevents = i * G.total_cpus + G.total_interrupt;
826 if (i < 0)
827 totalevents += G.interrupt_0 - i;
828 }
829#endif
830 /* Upstream powertop prints wakeups per sec per CPU,
831 * we print just raw wakeup counts.
832 */
833//TODO: show real seconds (think about manual refresh)
834 printf("\nWakeups-from-idle in %u seconds: %llu\n",
835 DEFAULT_SLEEP,
836 totalevents
837 );
838
839 update_lines_cumulative_count();
840 sort_lines();
841 show_timerstats();
842 fflush(stdout);
843
844 /* Clear the stats */
845 memset(cur_duration, 0, sizeof(cur_duration));
846 memset(cur_usage, 0, sizeof(cur_usage));
847
848 /* Get new values */
849 read_cstate_counts(cur_usage, cur_duration);
850
851 /* Save them */
852 memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
853 memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));
854 } /* for (;;) */
855
856 bb_putchar('\n');
857
858 return EXIT_SUCCESS;
859}
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