2f8ad6c087
cycle too much, wasting power if we trigger a jump to full speed too easily. CPU-bound tasks quickly push idle below this level.
457 lines
11 KiB
C
457 lines
11 KiB
C
/*-
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* Copyright (c) 2004 Colin Percival
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* Copyright (c) 2005 Nate Lawson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted providing that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef __i386__
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#include <machine/apm_bios.h>
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#endif
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <sys/resource.h>
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#define DEFAULT_ACTIVE_PERCENT 65
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#define DEFAULT_IDLE_PERCENT 90
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#define DEFAULT_POLL_INTERVAL 500 /* Poll interval in milliseconds */
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enum modes_t {
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MODE_MIN,
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MODE_ADAPTIVE,
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MODE_MAX,
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};
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enum power_src_t {
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SRC_AC,
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SRC_BATTERY,
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SRC_UNKNOWN,
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};
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const char *modes[] = {
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"AC",
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"battery",
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"unknown"
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};
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#define ACPIAC "hw.acpi.acline"
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#define APMDEV "/dev/apm"
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static int read_usage_times(long *idle, long *total);
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static int read_freqs(int *numfreqs, int **freqs, int **power);
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static int set_freq(int freq);
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static void acline_init(void);
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static int acline_read(void);
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static void handle_sigs(int sig);
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static void parse_mode(char *arg, int *mode, int ch);
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static void usage(void);
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/* Sysctl data structures. */
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static int cp_time_mib[2];
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static int freq_mib[4];
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static int levels_mib[4];
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static int acline_mib[3];
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/* Configuration */
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static int cpu_running_mark;
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static int cpu_idle_mark;
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static int poll_ival;
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static int apm_fd;
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static int exit_requested;
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static int
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read_usage_times(long *idle, long *total)
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{
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static long idle_old, total_old;
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long cp_time[CPUSTATES], i, total_new;
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size_t cp_time_len;
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int error;
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cp_time_len = sizeof(cp_time);
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error = sysctl(cp_time_mib, 2, cp_time, &cp_time_len, NULL, 0);
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if (error)
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return (error);
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for (total_new = 0, i = 0; i < CPUSTATES; i++)
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total_new += cp_time[i];
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if (idle)
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*idle = cp_time[CP_IDLE] - idle_old;
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if (total)
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*total = total_new - total_old;
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idle_old = cp_time[CP_IDLE];
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total_old = total_new;
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return (0);
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}
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static int
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read_freqs(int *numfreqs, int **freqs, int **power)
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{
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char *freqstr, *p, *q;
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int i;
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size_t len = 0;
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if (sysctl(levels_mib, 4, NULL, &len, NULL, 0))
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return (-1);
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if ((freqstr = malloc(len)) == NULL)
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return (-1);
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if (sysctl(levels_mib, 4, freqstr, &len, NULL, 0))
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return (-1);
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*numfreqs = 1;
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for (p = freqstr; *p != '\0'; p++)
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if (*p == ' ')
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(*numfreqs)++;
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if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) {
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free(freqstr);
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return (-1);
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}
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if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) {
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free(freqstr);
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free(*freqs);
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return (-1);
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}
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for (i = 0, p = freqstr; i < *numfreqs; i++) {
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q = strchr(p, ' ');
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if (q != NULL)
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*q = '\0';
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if (sscanf(p, "%d/%d", &(*freqs)[i], &(*power)[i]) != 2) {
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free(freqstr);
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free(*freqs);
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free(*power);
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return (-1);
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}
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p = q + 1;
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}
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free(freqstr);
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return (0);
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}
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static int
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set_freq(int freq)
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{
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if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq)))
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return (-1);
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return (0);
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}
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/*
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* Try to use ACPI to find the AC line status. If this fails, fall back
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* to APM. If nothing succeeds, we'll just run in default mode.
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*/
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static void
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acline_init()
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{
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int acline;
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size_t len;
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apm_fd = -1;
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len = sizeof(acline);
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if (sysctlbyname(ACPIAC, &acline, &len, NULL, 0) == 0) {
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len = 3;
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if (sysctlnametomib(ACPIAC, acline_mib, &len))
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err(1, "lookup acline");
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} else {
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apm_fd = open(APMDEV, O_RDONLY);
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if (apm_fd == -1)
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warnx(
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"cannot read AC line status, using default settings");
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}
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}
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static int
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acline_read()
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{
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int acline = SRC_UNKNOWN;
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size_t len;
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#ifdef __i386__
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struct apm_info info;
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if (apm_fd != -1 && ioctl(apm_fd, APMIO_GETINFO, &info) == 0)
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acline = info.ai_acline ? SRC_AC : SRC_BATTERY;
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#endif
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if (acline == SRC_UNKNOWN) {
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len = sizeof(acline);
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if (sysctl(acline_mib, 3, &acline, &len, NULL, 0) == 0)
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acline = acline ? SRC_AC : SRC_BATTERY;
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}
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return (acline);
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}
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static void
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parse_mode(char *arg, int *mode, int ch)
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{
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if (strcmp(arg, "min") == 0)
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*mode = MODE_MIN;
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else if (strcmp(arg, "max") == 0)
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*mode = MODE_MAX;
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else if (strcmp(arg, "adaptive") == 0)
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*mode = MODE_ADAPTIVE;
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else
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errx(1, "bad option: -%c %s", (char)ch, optarg);
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}
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static void
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handle_sigs(int __unused sig)
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{
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exit_requested = 1;
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-n mode] [-p ival] [-r %%]\n");
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exit(1);
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}
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int
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main(int argc, char * argv[])
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{
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long idle, total;
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int curfreq, *freqs, i, *mwatts, numfreqs;
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int ch, mode_ac, mode_battery, mode_none, acline, mode, vflag;
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uint64_t mjoules_used;
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size_t len;
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/* Default mode for all AC states is adaptive. */
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mode_ac = mode_battery = mode_none = MODE_ADAPTIVE;
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cpu_running_mark = DEFAULT_ACTIVE_PERCENT;
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cpu_idle_mark = DEFAULT_IDLE_PERCENT;
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poll_ival = DEFAULT_POLL_INTERVAL;
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mjoules_used = 0;
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vflag = 0;
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apm_fd = -1;
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while ((ch = getopt(argc, argv, "a:b:i:n:p:r:v")) != EOF)
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switch (ch) {
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case 'a':
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parse_mode(optarg, &mode_ac, ch);
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break;
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case 'b':
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parse_mode(optarg, &mode_battery, ch);
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break;
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case 'i':
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cpu_idle_mark = atoi(optarg);
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if (cpu_idle_mark < 0 || cpu_idle_mark > 100) {
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warnx("%d is not a valid percent",
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cpu_idle_mark);
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usage();
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}
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break;
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case 'n':
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parse_mode(optarg, &mode_none, ch);
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break;
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case 'p':
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poll_ival = atoi(optarg);
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if (poll_ival < 5) {
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warnx("poll interval is in units of ms");
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usage();
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}
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break;
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case 'r':
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cpu_running_mark = atoi(optarg);
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if (cpu_running_mark < 0 || cpu_running_mark > 100) {
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warnx("%d is not a valid percent",
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cpu_running_mark);
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usage();
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}
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break;
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case 'v':
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vflag = 1;
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break;
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default:
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usage();
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}
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/* Poll interval is in units of ms. */
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poll_ival *= 1000;
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/* Look up various sysctl MIBs. */
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len = 2;
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if (sysctlnametomib("kern.cp_time", cp_time_mib, &len))
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err(1, "lookup kern.cp_time");
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len = 4;
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if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len))
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err(1, "lookup freq");
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len = 4;
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if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len))
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err(1, "lookup freq_levels");
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/* Check if we can read the idle time and supported freqs. */
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if (read_usage_times(NULL, NULL))
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err(1, "read_usage_times");
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if (read_freqs(&numfreqs, &freqs, &mwatts))
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err(1, "error reading supported CPU frequencies");
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/* Decide whether to use ACPI or APM to read the AC line status. */
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acline_init();
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/* Run in the background unless in verbose mode. */
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if (!vflag)
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daemon(0, 0);
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signal(SIGINT, handle_sigs);
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signal(SIGTERM, handle_sigs);
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/* Main loop. */
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for (;;) {
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/* Check status every few milliseconds. */
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usleep(poll_ival);
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/* If the user requested we quit, print some statistics. */
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if (exit_requested) {
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if (vflag && mjoules_used != 0)
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printf("total joules used: %u.%03u\n",
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(u_int)(mjoules_used / 1000),
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(int)mjoules_used % 1000);
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break;
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}
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/* Read the current AC status and record the mode. */
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acline = acline_read();
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switch (acline) {
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case SRC_AC:
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mode = mode_ac;
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break;
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case SRC_BATTERY:
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mode = mode_battery;
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break;
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case SRC_UNKNOWN:
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mode = mode_none;
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break;
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default:
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errx(1, "invalid AC line status %d", acline);
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}
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/* Read the current frequency. */
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len = sizeof(curfreq);
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if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0))
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err(1, "error reading current CPU frequency");
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if (vflag) {
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for (i = 0; i < numfreqs; i++) {
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if (freqs[i] == curfreq)
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break;
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}
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/* Keep a sum of all power actually used. */
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if (i < numfreqs && mwatts[i] != -1)
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mjoules_used +=
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(mwatts[i] * (poll_ival / 1000)) / 1000;
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}
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/* Always switch to the lowest frequency in min mode. */
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if (mode == MODE_MIN) {
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if (curfreq != freqs[numfreqs - 1]) {
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if (vflag) {
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printf("now operating on %s power; "
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"changing frequency to %d MHz\n",
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modes[acline], freqs[numfreqs - 1]);
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}
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if (set_freq(freqs[numfreqs - 1]))
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err(1, "error setting CPU freq %d",
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freqs[numfreqs - 1]);
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}
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continue;
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}
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/* Always switch to the highest frequency in max mode. */
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if (mode == MODE_MAX) {
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if (curfreq != freqs[0]) {
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if (vflag) {
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printf("now operating on %s power; "
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"changing frequency to %d MHz\n",
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modes[acline], freqs[0]);
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}
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if (set_freq(freqs[0]))
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err(1, "error setting CPU freq %d",
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freqs[0]);
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}
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continue;
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}
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/* Adaptive mode; get the current CPU usage times. */
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if (read_usage_times(&idle, &total))
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err(1, "read_usage_times");
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/*
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* If we're idle less than the active mark, jump the CPU to
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* its fastest speed if we're not there yet. If we're idle
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* more than the idle mark, drop down to the first setting
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* that is half the current speed (exponential backoff).
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*/
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if (idle < (total * cpu_running_mark) / 100 &&
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curfreq < freqs[0]) {
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if (vflag) {
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printf("idle time < %d%%, increasing clock"
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" speed from %d MHz to %d MHz\n",
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cpu_running_mark, curfreq, freqs[0]);
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}
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if (set_freq(freqs[0]))
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err(1, "error setting CPU frequency %d",
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freqs[0]);
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} else if (idle > (total * cpu_idle_mark) / 100 &&
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curfreq > freqs[numfreqs - 1]) {
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for (i = 0; i < numfreqs - 1; i++) {
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if (freqs[i] <= curfreq / 2)
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break;
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}
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if (vflag) {
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printf("idle time > %d%%, decreasing clock"
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" speed from %d MHz to %d MHz\n",
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cpu_idle_mark, curfreq, freqs[i]);
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}
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if (set_freq(freqs[i]))
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err(1, "error setting CPU frequency %d",
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freqs[i]);
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}
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}
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free(freqs);
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free(mwatts);
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exit(0);
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}
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