1 /* vi: set sw=4 ts=4: */
3 * A mini 'powertop' utility:
4 * Analyze power consumption on Intel-based laptops.
5 * Based on powertop 1.11.
7 * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
9 * Licensed under GPLv2, see file LICENSE in this source tree.
12 //applet:IF_POWERTOP(APPLET(powertop, BB_DIR_BIN, BB_SUID_DROP))
14 //kbuild:lib-$(CONFIG_POWERTOP) += powertop.o
16 //config:config POWERTOP
17 //config: bool "powertop"
20 //config: Analyze power consumption on Intel-based laptops
22 // XXX This should be configurable
23 #define ENABLE_FEATURE_POWERTOP_PROCIRQ 1
28 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
29 #define debug(fmt, ...) ((void)0)
32 #define BLOATY_HPET_IRQ_NUM_DETECTION 0
33 #define MAX_CSTATE_COUNT 8
37 #define DEFAULT_SLEEP 10
38 #define DEFAULT_SLEEP_STR "10"
40 /* Frequency of the ACPI timer */
41 #define FREQ_ACPI 3579.545
42 #define FREQ_ACPI_1000 3579545
44 /* Max filename length of entry in /sys/devices subsystem */
45 #define BIG_SYSNAME_LEN 16
47 typedef unsigned long long ullong;
55 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
65 struct line *lines; /* the most often used member */
67 int lines_cumulative_count;
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;
79 struct irqdata interrupts[IRQCOUNT];
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;
89 #define G (*ptr_to_globals)
90 #define INIT_G() do { \
91 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
94 #if ENABLE_FEATURE_USE_TERMIOS
95 static void reset_term(void)
97 tcsetattr_stdin_TCSANOW(&G.init_settings);
100 static void sig_handler(int signo UNUSED_PARAM)
107 static int write_str_to_file(const char *fname, const char *str)
109 FILE *fp = fopen_for_write(fname);
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")
121 static NOINLINE void clear_lines(void)
125 for (i = 0; i < G.lines_cnt; i++)
126 free(G.lines[i].string);
133 static void update_lines_cumulative_count(void)
136 for (i = 0; i < G.lines_cnt; i++)
137 G.lines_cumulative_count += G.lines[i].count;
140 static int line_compare(const void *p1, const void *p2)
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*/);
147 static void sort_lines(void)
149 qsort(G.lines, G.lines_cnt, sizeof(G.lines[0]), line_compare);
152 /* Save C-state usage and duration. Also update maxcstate. */
153 static void read_cstate_counts(ullong *usage, ullong *duration)
158 dir = opendir("/proc/acpi/processor");
162 while ((d = readdir(dir)) != NULL) {
168 len = strlen(d->d_name); /* "CPUnn" */
169 if (len < 3 || len > BIG_SYSNAME_LEN)
172 sprintf(buf, "%s/%s/power", "/proc/acpi/processor", d->d_name);
173 fp = fopen_for_read(buf);
177 // Example file contents:
180 // maximum allowed latency: 2000000000 usec
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]
186 while (fgets(buf, sizeof(buf), fp)) {
187 char *p = strstr(buf, "age[");
191 usage[level] += bb_strtoull(p, NULL, 10) + 1;
192 p = strstr(buf, "ation[");
196 duration[level] += bb_strtoull(p, NULL, 10);
198 if (level >= MAX_CSTATE_COUNT-1)
201 if (level > G.maxcstate) /* update maxcstate */
209 /* Add line and/or update count */
210 static void save_line(const char *string, int count)
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;
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;*/
229 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
230 static int is_hpet_irq(const char *name)
233 # if BLOATY_HPET_IRQ_NUM_DETECTION
236 /* Learn the range of existing hpet timers. This is done once */
237 if (!G.scanned_timer_list) {
241 G.scanned_timer_list = true;
242 fp = fopen_for_read("/proc/timer_list");
246 while (fgets(buf, sizeof(buf), fp)) {
247 p = strstr(buf, "Clock Event Device: hpet");
250 p += sizeof("Clock Event Device: hpet")-1;
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;
263 p = strstr(name, "hpet");
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)
277 /* Save new IRQ count, return delta from old one */
278 static int save_irq_count(int irq, ullong count)
280 int unused = IRQCOUNT;
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;
288 if (!G.interrupts[i].active && unused > i)
291 if (unused < IRQCOUNT) {
292 G.interrupts[unused].active = 1;
293 G.interrupts[unused].count = count;
294 G.interrupts[unused].number = irq;
299 /* Read /proc/interrupts, save IRQ counts and IRQ description */
300 static void process_irq_counts(void)
307 G.total_interrupt = 0;
309 fp = xfopen_for_read("/proc/interrupts");
310 while (fgets(buf, sizeof(buf), fp)) {
311 char irq_desc[sizeof(" <kernel IPI> : ") + sizeof(buf)];
318 p = strchr(buf, ':');
321 /* 0: 143646045 153901007 IO-APIC-edge timer
325 /* Deal with non-maskable interrupts -- make up fake numbers */
326 nr = index_in_strings("NMI\0RES\0CAL\0TLB\0TRM\0THR\0SPU\0", buf);
330 /* bb_strtou doesn't eat leading spaces, using strtoul */
332 nr = strtoul(buf, NULL, 10);
337 /* 0: 143646045 153901007 IO-APIC-edge timer
340 /* Sum counts for this IRQ */
344 p = skip_whitespace(p);
347 count += bb_strtoull(p, &tmp, 10);
350 /* 0: 143646045 153901007 IO-APIC-edge timer
351 * NMI: 1 2 Non-maskable interrupts
355 /* Skip to the interrupt name, e.g. 'timer' */
359 p = skip_whitespace(p);
363 strchrnul(name, '\n')[0] = '\0';
364 /* Save description of the interrupt */
366 sprintf(irq_desc, " <kernel IPI> : %s", name);
368 sprintf(irq_desc, " <interrupt> : %s", name);
370 delta = save_irq_count(nr, count);
372 /* Skip per CPU timer interrupts */
373 if (is_hpet_irq(name))
376 if (nr != 0 && delta != 0)
377 save_line(irq_desc, delta);
380 G.interrupt_0 = delta;
382 G.total_interrupt += delta;
387 #else /* !ENABLE_FEATURE_POWERTOP_PROCIRQ */
388 # define process_irq_counts() ((void)0)
391 static NOINLINE int process_timer_stats(void)
394 char line[15 + 3 + 128];
404 if (!G.cant_enable_timer_stats)
405 fp = fopen_for_read("/proc/timer_stats");
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)
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;
424 count = skip_whitespace(buf);
425 p = strchr(count, ',');
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);
440 if (strchr(count, 'D'))
441 continue; /* deferred */
442 p = skip_whitespace(p); /* points to pid now */
449 p = skip_whitespace(p);
450 if (process == NULL) {
456 //if (strcmp(process, "swapper") == 0
457 // && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
459 // process = "[kernel scheduler]";
460 // func = "Load balancing tick";
463 if (strncmp(func, "tick_nohz_", 10) == 0)
465 if (strncmp(func, "tick_setup_sched_timer", 20) == 0)
467 //if (strcmp(process, "powertop") == 0)
470 idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
472 process = idx < 2 ? "[kernel module]" : "<kernel core>";
475 strchrnul(p, '\n')[0] = '\0';
477 // 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
479 // count process func
481 //if (strchr(process, '['))
482 sprintf(line, "%15.15s : %s", process, func);
484 // sprintf(line, "%s", process);
485 save_line(line, cnt);
495 * Get information about CPU using CPUID opcode.
497 static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
500 /* EAX value specifies what information to return */
502 " pushl %%ebx\n" /* Save EBX */
504 " movl %%ebx, %1\n" /* Save content of EBX */
505 " popl %%ebx\n" /* Restore EBX */
506 : "=a"(*eax), /* Output */
510 : "0"(*eax), /* Input */
514 /* No clobbered registers */
520 static NOINLINE void print_intel_cstates(void)
522 int bios_table[8] = { 0 };
527 unsigned eax, ebx, ecx, edx;
529 cpudir = opendir("/sys/devices/system/cpu");
533 /* Loop over cpuN entries */
534 while ((d = readdir(cpudir)) != NULL) {
537 char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
539 len = strlen(d->d_name);
540 if (len < 3 || len > BIG_SYSNAME_LEN)
543 if (!isdigit(d->d_name[3]))
546 len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
547 dir = opendir(fname);
552 * Every C-state has its own stateN directory, that
553 * contains a 'time' and a 'usage' file.
555 while ((d = readdir(dir)) != NULL) {
560 n = strlen(d->d_name);
561 if (n < 3 || n > BIG_SYSNAME_LEN)
564 sprintf(fname + len, "/%s/desc", d->d_name);
565 fp = fopen_for_read(fname);
567 char *p = fgets(buf, sizeof(buf), fp);
571 p = strstr(p, "MWAIT ");
574 p += sizeof("MWAIT ") - 1;
575 pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
576 if (pos >= ARRAY_SIZE(bios_table))
592 cpuid(&eax, &ebx, &ecx, &edx);
593 if (!edx || !(ecx & 1))
596 printf("Your CPU supports the following C-states: ");
606 /* Print BIOS C-States */
607 printf("Your BIOS reports the following C-states: ");
608 for (i = 0; i < ARRAY_SIZE(bios_table); i++)
615 # define print_intel_cstates() ((void)0)
618 static void show_timerstats(void)
622 /* Get terminal height */
623 get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
625 /* We don't have whole terminal just for timerstats */
628 if (!G.cant_enable_timer_stats) {
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*/)
638 /* NB: upstream powertop prints "(wakeups/sec)",
639 * we print just "(wakeup counts)".
642 if (G.lines[i].disk_count)
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,
654 bb_error_msg("no stats available; run as root or"
655 " enable the cpufreq_stats module");
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%)
667 // Wakeups-from-idle per second : 93.6 interval: 15.0s
668 // no ACPI power usage estimate available
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)
677 //usage:#define powertop_trivial_usage
679 //usage:#define powertop_full_usage "\n\n"
680 //usage: "Analyze power consumption on Intel-based laptops\n"
682 int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
683 int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
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];
693 pfd[0].events = POLLIN;
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;
703 /* Print warning when we don't have superuser privileges */
705 bb_error_msg("run as root to collect enough information");
707 /* Get number of CPUs */
708 G.total_cpus = get_cpu_count();
710 printf("Collecting data for "DEFAULT_SLEEP_STR" seconds\n");
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 */
719 bb_signals(BB_FATAL_SIGS, sig_handler);
720 tcsetattr_stdin_TCSANOW(&new_settings);
723 /* Collect initial data */
724 process_irq_counts();
726 /* Read initial usage and duration */
727 read_cstate_counts(G.start_usage, G.start_duration);
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));
733 /* Display C-states */
734 print_intel_cstates();
736 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
740 //double maxsleep = 0.0;
741 ullong totalticks, totalevents;
744 G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
745 #if !ENABLE_FEATURE_USE_TERMIOS
746 sleep(DEFAULT_SLEEP);
748 if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
750 if (safe_read(STDIN_FILENO, &c, 1) != 1)
751 break; /* EOF/error */
752 if (c == G.init_settings.c_cc[VINTR])
754 if ((c | 0x20) == 'q')
758 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
761 process_irq_counts();
763 /* Clear the stats */
764 memset(cur_duration, 0, sizeof(cur_duration));
765 memset(cur_usage, 0, sizeof(cur_usage));
768 read_cstate_counts(cur_usage, cur_duration);
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];
779 /* Clear the screen */
780 printf("\033[H\033[J");
782 /* Clear C-state lines */
783 memset(&cstate_lines, 0, sizeof(cstate_lines));
785 if (totalevents == 0 && G.maxcstate <= 1) {
786 /* This should not happen */
787 strcpy(cstate_lines[0], "C-state information is not available\n");
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)
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);
801 /* Compute values for individual C-states */
802 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
803 if (cur_usage[i] != 0) {
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)
817 for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
818 if (cstate_lines[i][0])
819 fputs(cstate_lines[i], stdout);
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;
827 totalevents += G.interrupt_0 - i;
830 /* Upstream powertop prints wakeups per sec per CPU,
831 * we print just raw wakeup counts.
833 //TODO: show real seconds (think about manual refresh)
834 printf("\nWakeups-from-idle in %u seconds: %llu\n",
839 update_lines_cumulative_count();
844 /* Clear the stats */
845 memset(cur_duration, 0, sizeof(cur_duration));
846 memset(cur_usage, 0, sizeof(cur_usage));
849 read_cstate_counts(cur_usage, cur_duration);
852 memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
853 memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));