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_USR_SBIN, 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 //config:config FEATURE_POWERTOP_INTERACTIVE
23 //config: bool "Accept keyboard commands"
25 //config: depends on POWERTOP
27 //config: Without this, powertop will only refresh display every 10 seconds.
28 //config: No keyboard commands will work, only ^C to terminate.
30 // XXX This should be configurable
31 #define ENABLE_FEATURE_POWERTOP_PROCIRQ 1
36 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
37 #define debug(fmt, ...) ((void)0)
40 #define BLOATY_HPET_IRQ_NUM_DETECTION 0
41 #define MAX_CSTATE_COUNT 8
45 #define DEFAULT_SLEEP 10
46 #define DEFAULT_SLEEP_STR "10"
48 /* Frequency of the ACPI timer */
49 #define FREQ_ACPI 3579.545
50 #define FREQ_ACPI_1000 3579545
52 /* Max filename length of entry in /sys/devices subsystem */
53 #define BIG_SYSNAME_LEN 16
55 typedef unsigned long long ullong;
63 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
73 struct line *lines; /* the most often used member */
75 int lines_cumulative_count;
78 smallint cant_enable_timer_stats;
79 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
80 # if BLOATY_HPET_IRQ_NUM_DETECTION
81 smallint scanned_timer_list;
82 int percpu_hpet_start;
87 struct irqdata interrupts[IRQCOUNT];
89 ullong start_usage[MAX_CSTATE_COUNT];
90 ullong last_usage[MAX_CSTATE_COUNT];
91 ullong start_duration[MAX_CSTATE_COUNT];
92 ullong last_duration[MAX_CSTATE_COUNT];
93 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
94 struct termios init_settings;
97 #define G (*ptr_to_globals)
98 #define INIT_G() do { \
99 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
102 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
103 static void reset_term(void)
105 tcsetattr_stdin_TCSANOW(&G.init_settings);
108 static void sig_handler(int signo UNUSED_PARAM)
115 static int write_str_to_file(const char *fname, const char *str)
117 FILE *fp = fopen_for_write(fname);
125 /* Make it more readable */
126 #define start_timer() write_str_to_file("/proc/timer_stats", "1\n")
127 #define stop_timer() write_str_to_file("/proc/timer_stats", "0\n")
129 static NOINLINE void clear_lines(void)
133 for (i = 0; i < G.lines_cnt; i++)
134 free(G.lines[i].string);
141 static void update_lines_cumulative_count(void)
144 for (i = 0; i < G.lines_cnt; i++)
145 G.lines_cumulative_count += G.lines[i].count;
148 static int line_compare(const void *p1, const void *p2)
150 const struct line *a = p1;
151 const struct line *b = p2;
152 return (b->count /*+ 50 * b->disk_count*/) - (a->count /*+ 50 * a->disk_count*/);
155 static void sort_lines(void)
157 qsort(G.lines, G.lines_cnt, sizeof(G.lines[0]), line_compare);
160 /* Save C-state usage and duration. Also update maxcstate. */
161 static void read_cstate_counts(ullong *usage, ullong *duration)
166 dir = opendir("/proc/acpi/processor");
170 while ((d = readdir(dir)) != NULL) {
176 len = strlen(d->d_name); /* "CPUnn" */
177 if (len < 3 || len > BIG_SYSNAME_LEN)
180 sprintf(buf, "%s/%s/power", "/proc/acpi/processor", d->d_name);
181 fp = fopen_for_read(buf);
185 // Example file contents:
188 // maximum allowed latency: 2000000000 usec
190 // C1: type[C1] promotion[--] demotion[--] latency[001] usage[00006173] duration[00000000000000000000]
191 // C2: type[C2] promotion[--] demotion[--] latency[001] usage[00085191] duration[00000000000083024907]
192 // C3: type[C3] promotion[--] demotion[--] latency[017] usage[01017622] duration[00000000017921327182]
194 while (fgets(buf, sizeof(buf), fp)) {
195 char *p = strstr(buf, "age[");
199 usage[level] += bb_strtoull(p, NULL, 10) + 1;
200 p = strstr(buf, "ation[");
204 duration[level] += bb_strtoull(p, NULL, 10);
206 if (level >= MAX_CSTATE_COUNT-1)
209 if (level > G.maxcstate) /* update maxcstate */
217 /* Add line and/or update count */
218 static void save_line(const char *string, int count)
221 for (i = 0; i < G.lines_cnt; i++) {
222 if (strcmp(string, G.lines[i].string) == 0) {
223 /* It's already there, only update count */
224 G.lines[i].count += count;
230 G.lines = xrealloc_vector(G.lines, 4, G.lines_cnt);
231 G.lines[G.lines_cnt].string = xstrdup(string);
232 G.lines[G.lines_cnt].count = count;
233 /*G.lines[G.lines_cnt].disk_count = 0;*/
237 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
238 static int is_hpet_irq(const char *name)
241 # if BLOATY_HPET_IRQ_NUM_DETECTION
244 /* Learn the range of existing hpet timers. This is done once */
245 if (!G.scanned_timer_list) {
249 G.scanned_timer_list = true;
250 fp = fopen_for_read("/proc/timer_list");
254 while (fgets(buf, sizeof(buf), fp)) {
255 p = strstr(buf, "Clock Event Device: hpet");
258 p += sizeof("Clock Event Device: hpet")-1;
261 hpet_chan = xatoi_positive(p);
262 if (hpet_chan < G.percpu_hpet_start)
263 G.percpu_hpet_start = hpet_chan;
264 if (hpet_chan > G.percpu_hpet_end)
265 G.percpu_hpet_end = hpet_chan;
271 p = strstr(name, "hpet");
277 # if BLOATY_HPET_IRQ_NUM_DETECTION
278 hpet_chan = xatoi_positive(p);
279 if (hpet_chan < G.percpu_hpet_start || hpet_chan > G.percpu_hpet_end)
285 /* Save new IRQ count, return delta from old one */
286 static int save_irq_count(int irq, ullong count)
288 int unused = IRQCOUNT;
290 for (i = 0; i < IRQCOUNT; i++) {
291 if (G.interrupts[i].active && G.interrupts[i].number == irq) {
292 ullong old = G.interrupts[i].count;
293 G.interrupts[i].count = count;
296 if (!G.interrupts[i].active && unused > i)
299 if (unused < IRQCOUNT) {
300 G.interrupts[unused].active = 1;
301 G.interrupts[unused].count = count;
302 G.interrupts[unused].number = irq;
307 /* Read /proc/interrupts, save IRQ counts and IRQ description */
308 static void process_irq_counts(void)
315 G.total_interrupt = 0;
317 fp = xfopen_for_read("/proc/interrupts");
318 while (fgets(buf, sizeof(buf), fp)) {
319 char irq_desc[sizeof(" <kernel IPI> : ") + sizeof(buf)];
326 p = strchr(buf, ':');
329 /* 0: 143646045 153901007 IO-APIC-edge timer
333 /* Deal with non-maskable interrupts -- make up fake numbers */
334 nr = index_in_strings("NMI\0RES\0CAL\0TLB\0TRM\0THR\0SPU\0", buf);
338 /* bb_strtou doesn't eat leading spaces, using strtoul */
340 nr = strtoul(buf, NULL, 10);
345 /* 0: 143646045 153901007 IO-APIC-edge timer
348 /* Sum counts for this IRQ */
352 p = skip_whitespace(p);
355 count += bb_strtoull(p, &tmp, 10);
358 /* 0: 143646045 153901007 IO-APIC-edge timer
359 * NMI: 1 2 Non-maskable interrupts
363 /* Skip to the interrupt name, e.g. 'timer' */
367 p = skip_whitespace(p);
372 /* Save description of the interrupt */
374 sprintf(irq_desc, " <kernel IPI> : %s", name);
376 sprintf(irq_desc, " <interrupt> : %s", name);
378 delta = save_irq_count(nr, count);
380 /* Skip per CPU timer interrupts */
381 if (is_hpet_irq(name))
384 if (nr != 0 && delta != 0)
385 save_line(irq_desc, delta);
388 G.interrupt_0 = delta;
390 G.total_interrupt += delta;
395 #else /* !ENABLE_FEATURE_POWERTOP_PROCIRQ */
396 # define process_irq_counts() ((void)0)
399 static NOINLINE int process_timer_stats(void)
402 char line[15 + 3 + 128];
410 if (!G.cant_enable_timer_stats)
411 fp = fopen_for_read("/proc/timer_stats");
413 // Example file contents:
414 // Timer Stats Version: v0.2
415 // Sample period: 1.329 s
416 // 76, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
417 // 88, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
418 // 24, 3787 firefox hrtimer_start_range_ns (hrtimer_wakeup)
419 // 46D, 1136 kondemand/1 do_dbs_timer (delayed_work_timer_fn)
421 // 1, 1656 Xorg hrtimer_start_range_ns (hrtimer_wakeup)
422 // 1, 2159 udisks-daemon hrtimer_start_range_ns (hrtimer_wakeup)
423 // 331 total events, 249.059 events/sec
424 while (fgets(buf, sizeof(buf), fp)) {
425 const char *count, *process, *func;
430 count = skip_whitespace(buf);
431 p = strchr(count, ',');
435 cnt = bb_strtou(count, NULL, 10);
436 if (strcmp(skip_non_whitespace(count), " total events") == 0) {
437 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
438 n = cnt / G.total_cpus;
439 if (n > 0 && n < G.interrupt_0) {
440 sprintf(line, " <interrupt> : %s", "extra timer interrupt");
441 save_line(line, G.interrupt_0 - n);
446 if (strchr(count, 'D'))
447 continue; /* deferred */
448 p = skip_whitespace(p); /* points to pid now */
455 p = skip_whitespace(p);
456 if (process == NULL) {
462 //if (strcmp(process, "swapper") == 0
463 // && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
465 // process = "[kernel scheduler]";
466 // func = "Load balancing tick";
469 if (is_prefixed_with(func, "tick_nohz_"))
471 if (is_prefixed_with(func, "tick_setup_sched_timer"))
473 //if (strcmp(process, "powertop") == 0)
476 idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
478 process = idx < 2 ? "[kernel module]" : "<kernel core>";
483 // 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
485 // count process func
487 //if (strchr(process, '['))
488 sprintf(line, "%15.15s : %s", process, func);
490 // sprintf(line, "%s", process);
491 save_line(line, cnt);
501 * Get information about CPU using CPUID opcode.
503 static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
506 /* EAX value specifies what information to return */
508 " pushl %%ebx\n" /* Save EBX */
510 " movl %%ebx, %1\n" /* Save content of EBX */
511 " popl %%ebx\n" /* Restore EBX */
512 : "=a"(*eax), /* Output */
516 : "0"(*eax), /* Input */
520 /* No clobbered registers */
526 static NOINLINE void print_intel_cstates(void)
528 int bios_table[8] = { 0 };
533 unsigned eax, ebx, ecx, edx;
535 cpudir = opendir("/sys/devices/system/cpu");
539 /* Loop over cpuN entries */
540 while ((d = readdir(cpudir)) != NULL) {
543 char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
545 len = strlen(d->d_name);
546 if (len < 3 || len > BIG_SYSNAME_LEN)
549 if (!isdigit(d->d_name[3]))
552 len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
553 dir = opendir(fname);
558 * Every C-state has its own stateN directory, that
559 * contains a 'time' and a 'usage' file.
561 while ((d = readdir(dir)) != NULL) {
566 n = strlen(d->d_name);
567 if (n < 3 || n > BIG_SYSNAME_LEN)
570 sprintf(fname + len, "/%s/desc", d->d_name);
571 fp = fopen_for_read(fname);
573 char *p = fgets(buf, sizeof(buf), fp);
577 p = strstr(p, "MWAIT ");
580 p += sizeof("MWAIT ") - 1;
581 pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
582 if (pos >= ARRAY_SIZE(bios_table))
598 cpuid(&eax, &ebx, &ecx, &edx);
599 if (!edx || !(ecx & 1))
602 printf("Your %s the following C-states: ", "CPU supports");
612 /* Print BIOS C-States */
613 printf("Your %s the following C-states: ", "BIOS reports");
614 for (i = 0; i < ARRAY_SIZE(bios_table); i++)
621 # define print_intel_cstates() ((void)0)
624 static void show_timerstats(void)
628 /* Get terminal height */
629 get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
631 /* We don't have whole terminal just for timerstats */
634 if (!G.cant_enable_timer_stats) {
638 puts("\nTop causes for wakeups:");
639 for (i = 0; i < G.lines_cnt; i++) {
640 if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
643 /* NB: upstream powertop prints "(wakeups/sec)",
644 * we print just "(wakeup counts)".
647 if (G.lines[i].disk_count)
649 smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY")[0] = '\0';
650 printf(/*" %5.1f%% (%s)%c %s\n"*/
651 " %5.1f%% (%s) %s\n",
652 G.lines[i].count * 100.0 / G.lines_cumulative_count,
659 bb_error_msg("no stats available; run as root or"
660 " enable the timer_stats module");
664 // Example display from powertop version 1.11
665 // Cn Avg residency P-states (frequencies)
666 // C0 (cpu running) ( 0.5%) 2.00 Ghz 0.0%
667 // polling 0.0ms ( 0.0%) 1.67 Ghz 0.0%
668 // C1 mwait 0.0ms ( 0.0%) 1333 Mhz 0.1%
669 // C2 mwait 0.1ms ( 0.1%) 1000 Mhz 99.9%
670 // C3 mwait 12.1ms (99.4%)
672 // Wakeups-from-idle per second : 93.6 interval: 15.0s
673 // no ACPI power usage estimate available
675 // Top causes for wakeups:
676 // 32.4% ( 26.7) <interrupt> : extra timer interrupt
677 // 29.0% ( 23.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
678 // 9.0% ( 7.5) <kernel core> : hrtimer_start (tick_sched_timer)
679 // 6.5% ( 5.3) <interrupt> : ata_piix
680 // 5.0% ( 4.1) inetd : hrtimer_start_range_ns (hrtimer_wakeup)
682 //usage:#define powertop_trivial_usage
684 //usage:#define powertop_full_usage "\n\n"
685 //usage: "Analyze power consumption on Intel-based laptops"
687 int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
688 int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
690 ullong cur_usage[MAX_CSTATE_COUNT];
691 ullong cur_duration[MAX_CSTATE_COUNT];
692 char cstate_lines[MAX_CSTATE_COUNT + 2][64];
693 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
694 struct pollfd pfd[1];
697 pfd[0].events = POLLIN;
702 #if ENABLE_FEATURE_POWERTOP_PROCIRQ && BLOATY_HPET_IRQ_NUM_DETECTION
703 G.percpu_hpet_start = INT_MAX;
704 G.percpu_hpet_end = INT_MIN;
707 /* Print warning when we don't have superuser privileges */
709 bb_error_msg("run as root to collect enough information");
711 /* Get number of CPUs */
712 G.total_cpus = get_cpu_count();
714 puts("Collecting data for "DEFAULT_SLEEP_STR" seconds");
716 #if ENABLE_FEATURE_POWERTOP_INTERACTIVE
717 /* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
718 set_termios_to_raw(STDIN_FILENO, &G.init_settings, TERMIOS_CLEAR_ISIG);
719 bb_signals(BB_FATAL_SIGS, sig_handler);
720 /* So we don't forget to reset term settings */
724 /* Collect initial data */
725 process_irq_counts();
727 /* Read initial usage and duration */
728 read_cstate_counts(G.start_usage, G.start_duration);
730 /* Copy them to "last" */
731 memcpy(G.last_usage, G.start_usage, sizeof(G.last_usage));
732 memcpy(G.last_duration, G.start_duration, sizeof(G.last_duration));
734 /* Display C-states */
735 print_intel_cstates();
737 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
741 //double maxsleep = 0.0;
742 ullong totalticks, totalevents;
745 G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
746 #if !ENABLE_FEATURE_POWERTOP_INTERACTIVE
747 sleep(DEFAULT_SLEEP);
749 if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
751 if (safe_read(STDIN_FILENO, &c, 1) != 1)
752 break; /* EOF/error */
753 if (c == G.init_settings.c_cc[VINTR])
755 if ((c | 0x20) == 'q')
759 G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
762 process_irq_counts();
764 /* Clear the stats */
765 memset(cur_duration, 0, sizeof(cur_duration));
766 memset(cur_usage, 0, sizeof(cur_usage));
769 read_cstate_counts(cur_usage, cur_duration);
771 /* Count totalticks and totalevents */
772 totalticks = totalevents = 0;
773 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
774 if (cur_usage[i] != 0) {
775 totalticks += cur_duration[i] - G.last_duration[i];
776 totalevents += cur_usage[i] - G.last_usage[i];
780 /* Clear the screen */
781 printf("\033[H\033[J");
783 /* Clear C-state lines */
784 memset(&cstate_lines, 0, sizeof(cstate_lines));
786 if (totalevents == 0 && G.maxcstate <= 1) {
787 /* This should not happen */
788 strcpy(cstate_lines[0], "C-state information is not available\n");
793 newticks = G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000 - totalticks;
794 /* Handle rounding errors: do not display negative values */
795 if ((int)newticks < 0)
798 sprintf(cstate_lines[0], "Cn\t\t Avg residency\n");
799 percentage = newticks * 100.0 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
800 sprintf(cstate_lines[1], "C0 (cpu running) (%4.1f%%)\n", percentage);
802 /* Compute values for individual C-states */
803 for (i = 0; i < MAX_CSTATE_COUNT; i++) {
804 if (cur_usage[i] != 0) {
806 slept = (cur_duration[i] - G.last_duration[i])
807 / (cur_usage[i] - G.last_usage[i] + 0.1) / FREQ_ACPI;
808 percentage = (cur_duration[i] - G.last_duration[i]) * 100
809 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
810 sprintf(cstate_lines[i + 2], "C%u\t\t%5.1fms (%4.1f%%)\n",
811 i + 1, slept, percentage);
812 //if (maxsleep < slept)
818 for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
819 if (cstate_lines[i][0])
820 fputs(cstate_lines[i], stdout);
822 i = process_timer_stats();
823 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
824 if (totalevents == 0) {
825 /* No C-state info available, use timerstats */
826 totalevents = i * G.total_cpus + G.total_interrupt;
828 totalevents += G.interrupt_0 - i;
831 /* Upstream powertop prints wakeups per sec per CPU,
832 * we print just raw wakeup counts.
834 //TODO: show real seconds (think about manual refresh)
835 printf("\nWakeups-from-idle in %u seconds: %llu\n",
840 update_lines_cumulative_count();
845 /* Clear the stats */
846 memset(cur_duration, 0, sizeof(cur_duration));
847 memset(cur_usage, 0, sizeof(cur_usage));
850 read_cstate_counts(cur_usage, cur_duration);
853 memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
854 memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));