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/* vi: set sw=4 ts=4: */
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* A mini 'powertop' utility:
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* Analyze power consumption on Intel-based laptops.
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* Based on powertop 1.11.
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* Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
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* Licensed under GPLv2, see file LICENSE in this source tree.
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//config:config POWERTOP
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//config: bool "powertop (9.9 kb)"
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//config: Analyze power consumption on Intel-based laptops
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//config:config FEATURE_POWERTOP_INTERACTIVE
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//config: bool "Accept keyboard commands"
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//config: depends on POWERTOP
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//config: Without this, powertop will only refresh display every 10 seconds.
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//config: No keyboard commands will work, only ^C to terminate.
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//applet:IF_POWERTOP(APPLET(powertop, BB_DIR_USR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_POWERTOP) += powertop.o
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// XXX This should be configurable
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#define ENABLE_FEATURE_POWERTOP_PROCIRQ 1
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//#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
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#define debug(fmt, ...) ((void)0)
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#define BLOATY_HPET_IRQ_NUM_DETECTION 0
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#define MAX_CSTATE_COUNT 8
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#define DEFAULT_SLEEP 10
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#define DEFAULT_SLEEP_STR "10"
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/* Frequency of the ACPI timer */
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#define FREQ_ACPI 3579.545
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#define FREQ_ACPI_1000 3579545
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/* Max filename length of entry in /sys/devices subsystem */
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#define BIG_SYSNAME_LEN 16
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typedef unsigned long long ullong;
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#if ENABLE_FEATURE_POWERTOP_PROCIRQ
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struct line *lines; /* the most often used member */
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int lines_cumulative_count;
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smallint cant_enable_timer_stats;
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#if ENABLE_FEATURE_POWERTOP_PROCIRQ
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# if BLOATY_HPET_IRQ_NUM_DETECTION
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smallint scanned_timer_list;
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int percpu_hpet_start;
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struct irqdata interrupts[IRQCOUNT];
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ullong start_usage[MAX_CSTATE_COUNT];
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ullong last_usage[MAX_CSTATE_COUNT];
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ullong start_duration[MAX_CSTATE_COUNT];
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ullong last_duration[MAX_CSTATE_COUNT];
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#if ENABLE_FEATURE_POWERTOP_INTERACTIVE
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struct termios init_settings;
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#define G (*ptr_to_globals)
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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#if ENABLE_FEATURE_POWERTOP_INTERACTIVE
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static void reset_term(void)
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tcsetattr_stdin_TCSANOW(&G.init_settings);
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static void sig_handler(int signo UNUSED_PARAM)
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static int write_str_to_file(const char *fname, const char *str)
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FILE *fp = fopen_for_write(fname);
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/* Make it more readable */
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#define start_timer() write_str_to_file("/proc/timer_stats", "1\n")
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#define stop_timer() write_str_to_file("/proc/timer_stats", "0\n")
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static NOINLINE void clear_lines(void)
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for (i = 0; i < G.lines_cnt; i++)
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free(G.lines[i].string);
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static void update_lines_cumulative_count(void)
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for (i = 0; i < G.lines_cnt; i++)
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G.lines_cumulative_count += G.lines[i].count;
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static int line_compare(const void *p1, const void *p2)
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const struct line *a = p1;
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const struct line *b = p2;
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return (b->count /*+ 50 * b->disk_count*/) - (a->count /*+ 50 * a->disk_count*/);
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static void sort_lines(void)
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qsort(G.lines, G.lines_cnt, sizeof(G.lines[0]), line_compare);
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/* Save C-state usage and duration. Also update maxcstate. */
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static void read_cstate_counts(ullong *usage, ullong *duration)
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dir = opendir("/proc/acpi/processor");
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while ((d = readdir(dir)) != NULL) {
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len = strlen(d->d_name); /* "CPUnn" */
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if (len < 3 || len > BIG_SYSNAME_LEN)
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sprintf(buf, "%s/%s/power", "/proc/acpi/processor", d->d_name);
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fp = fopen_for_read(buf);
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// Example file contents:
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// maximum allowed latency: 2000000000 usec
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// C1: type[C1] promotion[--] demotion[--] latency[001] usage[00006173] duration[00000000000000000000]
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// C2: type[C2] promotion[--] demotion[--] latency[001] usage[00085191] duration[00000000000083024907]
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// C3: type[C3] promotion[--] demotion[--] latency[017] usage[01017622] duration[00000000017921327182]
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while (fgets(buf, sizeof(buf), fp)) {
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char *p = strstr(buf, "age[");
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usage[level] += bb_strtoull(p, NULL, 10) + 1;
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p = strstr(buf, "ation[");
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duration[level] += bb_strtoull(p, NULL, 10);
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if (level >= MAX_CSTATE_COUNT-1)
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if (level > G.maxcstate) /* update maxcstate */
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/* Add line and/or update count */
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static void save_line(const char *string, int count)
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for (i = 0; i < G.lines_cnt; i++) {
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if (strcmp(string, G.lines[i].string) == 0) {
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/* It's already there, only update count */
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G.lines[i].count += count;
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G.lines = xrealloc_vector(G.lines, 4, G.lines_cnt);
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G.lines[G.lines_cnt].string = xstrdup(string);
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G.lines[G.lines_cnt].count = count;
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/*G.lines[G.lines_cnt].disk_count = 0;*/
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#if ENABLE_FEATURE_POWERTOP_PROCIRQ
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static int is_hpet_irq(const char *name)
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# if BLOATY_HPET_IRQ_NUM_DETECTION
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/* Learn the range of existing hpet timers. This is done once */
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if (!G.scanned_timer_list) {
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G.scanned_timer_list = true;
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fp = fopen_for_read("/proc/timer_list");
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while (fgets(buf, sizeof(buf), fp)) {
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p = strstr(buf, "Clock Event Device: hpet");
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p += sizeof("Clock Event Device: hpet")-1;
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hpet_chan = xatoi_positive(p);
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if (hpet_chan < G.percpu_hpet_start)
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G.percpu_hpet_start = hpet_chan;
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if (hpet_chan > G.percpu_hpet_end)
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G.percpu_hpet_end = hpet_chan;
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p = strstr(name, "hpet");
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# if BLOATY_HPET_IRQ_NUM_DETECTION
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hpet_chan = xatoi_positive(p);
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if (hpet_chan < G.percpu_hpet_start || hpet_chan > G.percpu_hpet_end)
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/* Save new IRQ count, return delta from old one */
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static int save_irq_count(int irq, ullong count)
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int unused = IRQCOUNT;
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for (i = 0; i < IRQCOUNT; i++) {
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if (G.interrupts[i].active && G.interrupts[i].number == irq) {
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ullong old = G.interrupts[i].count;
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G.interrupts[i].count = count;
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if (!G.interrupts[i].active && unused > i)
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if (unused < IRQCOUNT) {
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G.interrupts[unused].active = 1;
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G.interrupts[unused].count = count;
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G.interrupts[unused].number = irq;
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/* Read /proc/interrupts, save IRQ counts and IRQ description */
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static void process_irq_counts(void)
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G.total_interrupt = 0;
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fp = xfopen_for_read("/proc/interrupts");
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while (fgets(buf, sizeof(buf), fp)) {
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char irq_desc[sizeof(" <kernel IPI> : ") + sizeof(buf)];
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p = strchr(buf, ':');
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/* 0: 143646045 153901007 IO-APIC-edge timer
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/* Deal with non-maskable interrupts -- make up fake numbers */
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nr = index_in_strings("NMI\0RES\0CAL\0TLB\0TRM\0THR\0SPU\0", buf);
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/* bb_strtou doesn't eat leading spaces, using strtoul */
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nr = strtoul(buf, NULL, 10);
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/* 0: 143646045 153901007 IO-APIC-edge timer
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/* Sum counts for this IRQ */
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p = skip_whitespace(p);
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count += bb_strtoull(p, &tmp, 10);
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/* 0: 143646045 153901007 IO-APIC-edge timer
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* NMI: 1 2 Non-maskable interrupts
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/* Skip to the interrupt name, e.g. 'timer' */
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p = skip_whitespace(p);
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/* Save description of the interrupt */
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sprintf(irq_desc, " <kernel IPI> : %s", name);
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sprintf(irq_desc, " <interrupt> : %s", name);
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delta = save_irq_count(nr, count);
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/* Skip per CPU timer interrupts */
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if (is_hpet_irq(name))
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if (nr != 0 && delta != 0)
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save_line(irq_desc, delta);
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G.interrupt_0 = delta;
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G.total_interrupt += delta;
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#else /* !ENABLE_FEATURE_POWERTOP_PROCIRQ */
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# define process_irq_counts() ((void)0)
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static NOINLINE int process_timer_stats(void)
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char line[15 + 3 + 128];
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if (!G.cant_enable_timer_stats)
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fp = fopen_for_read("/proc/timer_stats");
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// Example file contents:
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// Timer Stats Version: v0.2
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// Sample period: 1.329 s
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// 76, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
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// 88, 0 swapper hrtimer_start_range_ns (tick_sched_timer)
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// 24, 3787 firefox hrtimer_start_range_ns (hrtimer_wakeup)
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// 46D, 1136 kondemand/1 do_dbs_timer (delayed_work_timer_fn)
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// 1, 1656 Xorg hrtimer_start_range_ns (hrtimer_wakeup)
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// 1, 2159 udisks-daemon hrtimer_start_range_ns (hrtimer_wakeup)
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// 331 total events, 249.059 events/sec
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while (fgets(buf, sizeof(buf), fp)) {
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const char *count, *process, *func;
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count = skip_whitespace(buf);
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p = strchr(count, ',');
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cnt = bb_strtou(count, NULL, 10);
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if (strcmp(skip_non_whitespace(count), " total events") == 0) {
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#if ENABLE_FEATURE_POWERTOP_PROCIRQ
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n = cnt / G.total_cpus;
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if (n > 0 && n < G.interrupt_0) {
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sprintf(line, " <interrupt> : %s", "extra timer interrupt");
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save_line(line, G.interrupt_0 - n);
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if (strchr(count, 'D'))
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continue; /* deferred */
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p = skip_whitespace(p); /* points to pid now */
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p = skip_whitespace(p);
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if (process == NULL) {
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//if (strcmp(process, "swapper") == 0
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// && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
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// process = "[kernel scheduler]";
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// func = "Load balancing tick";
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if (is_prefixed_with(func, "tick_nohz_"))
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if (is_prefixed_with(func, "tick_setup_sched_timer"))
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//if (strcmp(process, "powertop") == 0)
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idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
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process = idx < 2 ? "[kernel module]" : "<kernel core>";
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// 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
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// count process func
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//if (strchr(process, '['))
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sprintf(line, "%15.15s : %s", process, func);
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// sprintf(line, "%s", process);
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save_line(line, cnt);
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static void cpuid_eax_ecx_edx(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
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: "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx)
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: "0" (*eax), "2" (*ecx), "3" (*edx)
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static NOINLINE void print_intel_cstates(void)
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int bios_table[8] = { 0 };
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unsigned eax, ebx, ecx, edx;
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cpudir = opendir("/sys/devices/system/cpu");
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/* Loop over cpuN entries */
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while ((d = readdir(cpudir)) != NULL) {
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char fname[sizeof("/sys/devices/system/cpu//cpuidle//desc") + 2*BIG_SYSNAME_LEN];
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len = strlen(d->d_name);
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if (len < 3 || len > BIG_SYSNAME_LEN)
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if (!isdigit(d->d_name[3]))
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len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
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dir = opendir(fname);
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* Every C-state has its own stateN directory, that
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* contains a 'time' and a 'usage' file.
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while ((d = readdir(dir)) != NULL) {
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n = strlen(d->d_name);
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if (n < 3 || n > BIG_SYSNAME_LEN)
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sprintf(fname + len, "/%s/desc", d->d_name);
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fp = fopen_for_read(fname);
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char *p = fgets(buf, sizeof(buf), fp);
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p = strstr(p, "MWAIT ");
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p += sizeof("MWAIT ") - 1;
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pos = (bb_strtoull(p, NULL, 16) >> 4) + 1;
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if (pos >= ARRAY_SIZE(bios_table))
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ecx = edx = 0; /* paranoia, should not be needed */
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cpuid_eax_ecx_edx(&eax, /*unused:*/&ebx, &ecx, &edx);
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if (!edx || !(ecx & 1))
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printf("Your %s the following C-states: ", "CPU supports");
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/* Print BIOS C-States */
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printf("Your %s the following C-states: ", "BIOS reports");
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for (i = 0; i < ARRAY_SIZE(bios_table); i++)
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# define print_intel_cstates() ((void)0)
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static void show_timerstats(void)
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/* Get terminal height */
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get_terminal_width_height(STDOUT_FILENO, NULL, &lines);
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/* We don't have whole terminal just for timerstats */
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if (!G.cant_enable_timer_stats) {
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puts("\nTop causes for wakeups:");
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for (i = 0; i < G.lines_cnt; i++) {
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if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
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/* NB: upstream powertop prints "(wakeups/sec)",
629
* we print just "(wakeup counts)".
632
if (G.lines[i].disk_count)
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smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY")[0] = '\0';
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printf(/*" %5.1f%% (%s)%c %s\n"*/
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" %5.1f%% (%s) %s\n",
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G.lines[i].count * 100.0 / G.lines_cumulative_count,
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bb_simple_error_msg("no stats available; run as root or"
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" enable the timer_stats module");
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// Example display from powertop version 1.11
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// Cn Avg residency P-states (frequencies)
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// C0 (cpu running) ( 0.5%) 2.00 Ghz 0.0%
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// polling 0.0ms ( 0.0%) 1.67 Ghz 0.0%
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// C1 mwait 0.0ms ( 0.0%) 1333 Mhz 0.1%
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// C2 mwait 0.1ms ( 0.1%) 1000 Mhz 99.9%
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// C3 mwait 12.1ms (99.4%)
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// Wakeups-from-idle per second : 93.6 interval: 15.0s
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// no ACPI power usage estimate available
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// Top causes for wakeups:
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// 32.4% ( 26.7) <interrupt> : extra timer interrupt
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// 29.0% ( 23.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
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// 9.0% ( 7.5) <kernel core> : hrtimer_start (tick_sched_timer)
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// 6.5% ( 5.3) <interrupt> : ata_piix
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// 5.0% ( 4.1) inetd : hrtimer_start_range_ns (hrtimer_wakeup)
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//usage:#define powertop_trivial_usage
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//usage:#define powertop_full_usage "\n\n"
670
//usage: "Analyze power consumption on Intel-based laptops"
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int powertop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int powertop_main(int argc UNUSED_PARAM, char UNUSED_PARAM **argv)
675
ullong cur_usage[MAX_CSTATE_COUNT];
676
ullong cur_duration[MAX_CSTATE_COUNT];
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char cstate_lines[MAX_CSTATE_COUNT + 2][64];
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#if ENABLE_FEATURE_POWERTOP_INTERACTIVE
679
struct pollfd pfd[1];
682
pfd[0].events = POLLIN;
687
#if ENABLE_FEATURE_POWERTOP_PROCIRQ && BLOATY_HPET_IRQ_NUM_DETECTION
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G.percpu_hpet_start = INT_MAX;
689
G.percpu_hpet_end = INT_MIN;
692
/* Print warning when we don't have superuser privileges */
694
bb_simple_error_msg("run as root to collect enough information");
696
/* Get number of CPUs */
697
G.total_cpus = get_cpu_count();
699
puts("Collecting data for "DEFAULT_SLEEP_STR" seconds");
701
#if ENABLE_FEATURE_POWERTOP_INTERACTIVE
702
/* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
703
set_termios_to_raw(STDIN_FILENO, &G.init_settings, TERMIOS_CLEAR_ISIG);
704
bb_signals(BB_FATAL_SIGS, sig_handler);
705
/* So we don't forget to reset term settings */
706
die_func = reset_term;
709
/* Collect initial data */
710
process_irq_counts();
712
/* Read initial usage and duration */
713
read_cstate_counts(G.start_usage, G.start_duration);
715
/* Copy them to "last" */
716
memcpy(G.last_usage, G.start_usage, sizeof(G.last_usage));
717
memcpy(G.last_duration, G.start_duration, sizeof(G.last_duration));
719
/* Display C-states */
720
print_intel_cstates();
722
G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
726
//double maxsleep = 0.0;
727
ullong totalticks, totalevents;
730
G.cant_enable_timer_stats |= start_timer(); /* 1 on error */
731
#if !ENABLE_FEATURE_POWERTOP_INTERACTIVE
732
sleep(DEFAULT_SLEEP);
734
if (safe_poll(pfd, 1, DEFAULT_SLEEP * 1000) > 0) {
736
if (safe_read(STDIN_FILENO, &c, 1) != 1)
737
break; /* EOF/error */
738
if (c == G.init_settings.c_cc[VINTR])
740
if ((c | 0x20) == 'q')
744
G.cant_enable_timer_stats |= stop_timer(); /* 1 on error */
747
process_irq_counts();
749
/* Clear the stats */
750
memset(cur_duration, 0, sizeof(cur_duration));
751
memset(cur_usage, 0, sizeof(cur_usage));
754
read_cstate_counts(cur_usage, cur_duration);
756
/* Count totalticks and totalevents */
757
totalticks = totalevents = 0;
758
for (i = 0; i < MAX_CSTATE_COUNT; i++) {
759
if (cur_usage[i] != 0) {
760
totalticks += cur_duration[i] - G.last_duration[i];
761
totalevents += cur_usage[i] - G.last_usage[i];
765
/* Home; clear screen */
766
printf(ESC"[H" ESC"[J");
768
/* Clear C-state lines */
769
memset(&cstate_lines, 0, sizeof(cstate_lines));
771
if (totalevents == 0 && G.maxcstate <= 1) {
772
/* This should not happen */
773
strcpy(cstate_lines[0], "C-state information is not available\n");
778
newticks = G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000 - totalticks;
779
/* Handle rounding errors: do not display negative values */
780
if ((int)newticks < 0)
783
sprintf(cstate_lines[0], "Cn\t\t Avg residency\n");
784
percentage = newticks * 100.0 / (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
785
sprintf(cstate_lines[1], "C0 (cpu running) (%4.1f%%)\n", percentage);
787
/* Compute values for individual C-states */
788
for (i = 0; i < MAX_CSTATE_COUNT; i++) {
789
if (cur_usage[i] != 0) {
791
slept = (cur_duration[i] - G.last_duration[i])
792
/ (cur_usage[i] - G.last_usage[i] + 0.1) / FREQ_ACPI;
793
percentage = (cur_duration[i] - G.last_duration[i]) * 100
794
/ (G.total_cpus * DEFAULT_SLEEP * FREQ_ACPI_1000);
795
sprintf(cstate_lines[i + 2], "C%u\t\t%5.1fms (%4.1f%%)\n",
796
i + 1, slept, percentage);
797
//if (maxsleep < slept)
803
for (i = 0; i < MAX_CSTATE_COUNT + 2; i++)
804
if (cstate_lines[i][0])
805
fputs_stdout(cstate_lines[i]);
807
i = process_timer_stats();
808
#if ENABLE_FEATURE_POWERTOP_PROCIRQ
809
if (totalevents == 0) {
810
/* No C-state info available, use timerstats */
811
totalevents = i * G.total_cpus + G.total_interrupt;
813
totalevents += G.interrupt_0 - i;
816
/* Upstream powertop prints wakeups per sec per CPU,
817
* we print just raw wakeup counts.
819
//TODO: show real seconds (think about manual refresh)
820
printf("\nWakeups-from-idle in %u seconds: %llu\n",
825
update_lines_cumulative_count();
830
/* Clear the stats */
831
memset(cur_duration, 0, sizeof(cur_duration));
832
memset(cur_usage, 0, sizeof(cur_usage));
835
read_cstate_counts(cur_usage, cur_duration);
838
memcpy(G.last_usage, cur_usage, sizeof(G.last_usage));
839
memcpy(G.last_duration, cur_duration, sizeof(G.last_duration));
843
#if ENABLE_FEATURE_POWERTOP_INTERACTIVE
added
removed
procps/powertop.c
