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Add support for recording the total energy used (in joules) when in

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verbose mode.  This is useful for profiling new adaptive algorithms
in performance (via time(1)) and total energy consumed for a given
workload.
This commit is contained in:
Nate Lawson 2005-04-10 19:02:29 +00:00
parent 7e266fcd1f
commit ab19351c39
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=144873
1 changed files with 47 additions and 6 deletions
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53
usr.sbin/powerd/powerd.c
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@ -30,6 +30,7 @@ __FBSDID("$FreeBSD$");
#include <err.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -69,10 +70,11 @@ const char *modes[] = {
#define APMDEV "/dev/apm"
static int read_usage_times(long *idle, long *total);
static int read_freqs(int *numfreqs, int **freqs);
static int read_freqs(int *numfreqs, int **freqs, int **power);
static int set_freq(int freq);
static void acline_init(void);
static int acline_read(void);
static void handle_sigs(int sig);
static void parse_mode(char *arg, int *mode, int ch);
static void usage(void);
@ -88,6 +90,7 @@ static int cpu_idle_mark;
static int poll_ival;
static int apm_fd;
static int exit_requested;
static int
read_usage_times(long *idle, long *total)
@ -116,7 +119,7 @@ read_usage_times(long *idle, long *total)
}
static int
read_freqs(int *numfreqs, int **freqs)
read_freqs(int *numfreqs, int **freqs, int **power)
{
char *freqstr, *p, *q;
int i;
@ -138,13 +141,19 @@ read_freqs(int *numfreqs, int **freqs)
free(freqstr);
return (-1);
}
if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) {
free(freqstr);
free(*freqs);
return (-1);
}
for (i = 0, p = freqstr; i < *numfreqs; i++) {
q = strchr(p, ' ');
if (q != NULL)
*q = '\0';
if (sscanf(p, "%d/%*d", &(*freqs)[i]) != 1) {
if (sscanf(p, "%d/%d", &(*freqs)[i], &(*power)[i]) != 2) {
free(freqstr);
free(*freqs);
free(*power);
return (-1);
}
p = q + 1;
@ -224,6 +233,12 @@ parse_mode(char *arg, int *mode, int ch)
errx(1, "bad option: -%c %s", (char)ch, optarg);
}
static void
handle_sigs(int __unused sig)
{
exit_requested = 1;
}
static void
usage(void)
{
@ -237,8 +252,9 @@ int
main(int argc, char * argv[])
{
long idle, total;
int curfreq, *freqs, i, numfreqs;
int curfreq, *freqs, i, *mwatts, numfreqs;
int ch, mode_ac, mode_battery, mode_none, acline, mode, vflag;
uint64_t mjoules_used;
size_t len;
/* Default mode for all AC states is adaptive. */
@ -246,6 +262,7 @@ main(int argc, char * argv[])
cpu_running_mark = DEFAULT_ACTIVE_PERCENT;
cpu_idle_mark = DEFAULT_IDLE_PERCENT;
poll_ival = DEFAULT_POLL_INTERVAL;
mjoules_used = 0;
vflag = 0;
apm_fd = -1;
@ -307,7 +324,7 @@ main(int argc, char * argv[])
/* Check if we can read the idle time and supported freqs. */
if (read_usage_times(NULL, NULL))
err(1, "read_usage_times");
if (read_freqs(&numfreqs, &freqs))
if (read_freqs(&numfreqs, &freqs, &mwatts))
err(1, "error reading supported CPU frequencies");
/* Decide whether to use ACPI or APM to read the AC line status. */
@ -316,12 +333,23 @@ main(int argc, char * argv[])
/* Run in the background unless in verbose mode. */
if (!vflag)
daemon(0, 0);
signal(SIGINT, handle_sigs);
signal(SIGTERM, handle_sigs);
/* Main loop. */
for (;;) {
/* Check status every few milliseconds. */
usleep(poll_ival);
/* If the user requested we quit, print some statistics. */
if (exit_requested) {
if (vflag && mjoules_used != 0)
printf("total joules used: %u.%03u\n",
(u_int)(mjoules_used / 1000),
(int)mjoules_used % 1000);
break;
}
/* Read the current AC status and record the mode. */
acline = acline_read();
switch (acline) {
@ -343,6 +371,18 @@ main(int argc, char * argv[])
if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0))
err(1, "error reading current CPU frequency");
if (vflag) {
for (i = 0; i < numfreqs; i++) {
if (freqs[i] == curfreq)
break;
}
/* Keep a sum of all power actually used. */
if (i < numfreqs && mwatts[i] != -1)
mjoules_used +=
(mwatts[i] * (poll_ival / 1000)) / 1000;
}
/* Always switch to the lowest frequency in min mode. */
if (mode == MODE_MIN) {
if (curfreq != freqs[numfreqs - 1]) {
@ -409,7 +449,8 @@ main(int argc, char * argv[])
freqs[i]);
}
}
/* NOTREACHED */
free(freqs);
free(mwatts);
exit(0);
}