Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: dade1f509f
Fetching contributors…

Cannot retrieve contributors at this time

350 lines (300 sloc) 8.079 kb
/*
* bootchart.c
*
* Copyright (c) 2009 Intel Coproration
* Authors:
* Auke Kok <auke-jan.h.kok@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2
* of the License.
*/
#include <sys/time.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <getopt.h>
#include <limits.h>
#include <errno.h>
#include "bootchart.h"
double graph_start;
double log_start;
double sampletime[MAXSAMPLES];
struct ps_struct *ps_first;
struct block_stat_struct blockstat[MAXSAMPLES];
int entropy_avail[MAXSAMPLES];
struct cpu_stat_struct cpustat[MAXCPUS];
int pscount;
int cpus;
double interval;
FILE *of;
int overrun = 0;
static int exiting = 0;
/* graph defaults */
int entropy = 0;
int initcall = 1;
int relative;
int filter = 1;
int pss = 0;
int samples;
int len = 500; /* we record len+1 (1 start sample) */
double hz = 25.0; /* 20 seconds log time */
double scale_x = 100.0; /* 100px = 1sec */
double scale_y = 20.0; /* 16px = 1 process bar */
char init_path[PATH_MAX] = "/sbin/init";
char output_path[PATH_MAX] = "/var/log";
static struct rlimit rlim;
static void signal_handler(int sig)
{
if (sig++)
sig--;
exiting = 1;
}
int main(int argc, char *argv[])
{
struct sigaction sig;
struct ps_struct *ps;
char output_file[PATH_MAX];
char datestr[200];
time_t t;
FILE *f;
memset(&t, 0, sizeof(time_t));
rlim.rlim_cur = 4096;
rlim.rlim_max = 4096;
(void) setrlimit(RLIMIT_NOFILE, &rlim);
f = fopen("/etc/bootchartd.conf", "r");
if (f) {
char buf[256];
char *key;
char *val;
while (fgets(buf, 80, f) != NULL) {
char *c;
c = strchr(buf, '\n');
if (c) *c = 0; /* remove trailing \n */
if (buf[0] == '#')
continue; /* comment line */
key = strtok(buf, "=");
if (!key)
continue;
val = strtok(NULL, "=");
if (!val)
continue;
// todo: filter leading/trailing whitespace
if (!strcmp(key, "samples"))
len = atoi(val);
if (!strcmp(key, "freq"))
hz = atof(val);
if (!strcmp(key, "rel"))
relative = atoi(val);
if (!strcmp(key, "filter"))
filter = atoi(val);
if (!strcmp(key, "pss"))
pss = atoi(val);
if (!strcmp(key, "output"))
strncpy(output_path, val, PATH_MAX - 1);
if (!strcmp(key, "init"))
strncpy(init_path, val, PATH_MAX - 1);
if (!strcmp(key, "scale_x"))
scale_x = atof(val);
if (!strcmp(key, "scale_y"))
scale_y = atof(val);
if (!strcmp(key, "entropy"))
entropy = atoi(val);
}
fclose(f);
}
while (1) {
static struct option opts[] = {
{"rel", 0, NULL, 'r'},
{"freq", 1, NULL, 'f'},
{"samples", 1, NULL, 'n'},
{"pss", 0, NULL, 'p'},
{"output", 1, NULL, 'o'},
{"init", 1, NULL, 'i'},
{"filter", 0, NULL, 'F'},
{"help", 0, NULL, 'h'},
{"scale-x", 1, NULL, 'x'},
{"scale-y", 1, NULL, 'y'},
{"entropy", 0, NULL, 'e'},
{NULL, 0, NULL, 0}
};
int index = 0, c;
c = getopt_long(argc, argv, "erpf:n:o:i:Fhx:y:", opts, &index);
if (c == -1)
break;
switch (c) {
case 'r':
relative = 1;
break;
case 'f':
hz = atof(optarg);
break;
case 'F':
filter = 0;
break;
case 'n':
len = atoi(optarg);
break;
case 'o':
strncpy(output_path, optarg, PATH_MAX - 1);
break;
case 'i':
strncpy(init_path, optarg, PATH_MAX - 1);
break;
case 'p':
pss = 1;
break;
case 'x':
scale_x = atof(optarg);
break;
case 'y':
scale_y = atof(optarg);
break;
case 'e':
entropy = 1;
break;
case 'h':
fprintf(stderr, "Usage: %s [OPTIONS]\n", argv[0]);
fprintf(stderr, " --rel, -r Record time relative to recording\n");
fprintf(stderr, " --freq, -f N Sample frequency [%f]\n", hz);
fprintf(stderr, " --samples, -n N Stop sampling at [%d] samples\n", len);
fprintf(stderr, " --scale-x, -x N Scale the graph horizontally [%f] \n", scale_x);
fprintf(stderr, " --scale-y, -y N Scale the graph vertically [%f] \n", scale_y);
fprintf(stderr, " --pss, -p Enable PSS graph (CPU intensive)\n");
fprintf(stderr, " --entropy, -e Enable the entropy_avail graph\n");
fprintf(stderr, " --output, -o [PATH] Path to output files [%s]\n", output_path);
fprintf(stderr, " --init, -i [PATH] Path to init executable [%s]\n", init_path);
fprintf(stderr, " --filter, -F Disable filtering of processes from the graph\n");
fprintf(stderr, " that are of less importance or short-lived\n");
fprintf(stderr, " --help, -h Display this message\n");
fprintf(stderr, "See the installed README and bootchartd.conf.example for more information.\n");
exit (EXIT_SUCCESS);
break;
default:
break;
}
}
if (len > MAXSAMPLES) {
fprintf(stderr, "Error: samples exceeds maximum\n");
exit(EXIT_FAILURE);
}
if (hz <= 0.0) {
fprintf(stderr, "Error: Frequency needs to be > 0\n");
exit(EXIT_FAILURE);
}
/*
* If the kernel executed us through init=/sbin/bootchartd, then
* fork:
* - parent execs executable specified via init_path[] (/sbin/init by default) as pid=1
* - child logs data
*/
if (getpid() == 1) {
if (fork()) {
/* parent */
execl(init_path, init_path, NULL);
}
}
/* start with empty ps LL */
ps_first = malloc(sizeof(struct ps_struct));
if (!ps_first) {
perror("malloc(ps_struct)");
exit(EXIT_FAILURE);
}
memset(ps_first, 0, sizeof(struct ps_struct));
/* handle TERM/INT nicely */
memset(&sig, 0, sizeof(struct sigaction));
sig.sa_handler = signal_handler;
sigaction(SIGHUP, &sig, NULL);
interval = (1.0 / hz) * 1000000000.0;
log_uptime();
/* main program loop */
while (!exiting) {
int res;
double sample_stop;
struct timespec req;
time_t newint_s;
long newint_ns;
double elapsed;
double timeleft;
sampletime[samples] = gettime_ns();
/* wait for /proc to become available, discarding samples */
if (!graph_start)
log_uptime();
else
log_sample(samples);
sample_stop = gettime_ns();
elapsed = (sample_stop - sampletime[samples]) * 1000000000.0;
timeleft = interval - elapsed;
newint_s = (time_t)(timeleft / 1000000000.0);
newint_ns = (long)(timeleft - (newint_s * 1000000000.0));
/*
* check if we have not consumed our entire timeslice. If we
* do, don't sleep and take a new sample right away.
* we'll lose all the missed samples and overrun our total
* time
*/
if ((newint_ns > 0) || (newint_s > 0)) {
req.tv_sec = newint_s;
req.tv_nsec = newint_ns;
res = nanosleep(&req, NULL);
if (res) {
if (errno == EINTR) {
/* caught signal, probably HUP! */
break;
}
perror("nanosleep()");
exit (EXIT_FAILURE);
}
} else {
overrun++;
/* calculate how many samples we lost and scrap them */
len = len + ((int)(newint_ns / interval));
}
samples++;
if (samples > len)
break;
}
/* do some cleanup, close fd's */
ps = ps_first;
while (ps->next_ps) {
ps = ps->next_ps;
if (ps->schedstat)
close(ps->schedstat);
if (ps->sched)
close(ps->sched);
if (ps->smaps)
fclose(ps->smaps);
}
closedir(proc);
t = time(NULL);
strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", output_path, datestr);
of = fopen(output_file, "w");
if (!of) {
perror("open output_file");
exit (EXIT_FAILURE);
}
svg_do();
fprintf(stderr, "bootchartd: Wrote %s\n", output_file);
fclose(of);
/* nitpic cleanups */
ps = ps_first;
while (ps->next_ps) {
struct ps_struct *old = ps;
ps = ps->next_ps;
free(old->sample);
free(old);
}
free(ps->sample);
free(ps);
/* don't complain when overrun once, happens most commonly on 1st sample */
if (overrun > 1)
fprintf(stderr, "bootchartd: Warning: sample time overrun %i times\n", overrun);
return 0;
}
Jump to Line
Something went wrong with that request. Please try again.