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Systemd/src/bootchart/bootchart.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2009-2013 Intel Coproration
Authors:
Auke Kok <auke-jan.h.kok@intel.com>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
/***
Many thanks to those who contributed ideas and code:
- Ziga Mahkovec - Original bootchart author
- Anders Norgaard - PyBootchartgui
- Michael Meeks - bootchart2
- Scott James Remnant - Ubuntu C-based logger
- Arjan van der Ven - for the idea to merge bootgraph.pl functionality
***/
#include <sys/time.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/stat.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 <fcntl.h>
#include <stdbool.h>
#include <systemd/sd-journal.h>
#include "util.h"
#include "fileio.h"
#include "macro.h"
#include "conf-parser.h"
#include "strxcpyx.h"
#include "path-util.h"
#include "store.h"
#include "svg.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 = NULL;
int overrun = 0;
static int exiting = 0;
int sysfd=-1;
/* graph defaults */
bool arg_entropy = false;
bool initcall = true;
bool arg_relative = false;
bool arg_filter = true;
bool arg_show_cmdline = false;
bool arg_pss = false;
int samples;
int arg_samples_len = 500; /* we record len+1 (1 start sample) */
double arg_hz = 25.0; /* 20 seconds log time */
double arg_scale_x = 100.0; /* 100px = 1sec */
double arg_scale_y = 20.0; /* 16px = 1 process bar */
char arg_init_path[PATH_MAX] = "/sbin/init";
char arg_output_path[PATH_MAX] = "/run/log";
static void signal_handler(int sig) {
if (sig++)
sig--;
exiting = 1;
}
#define BOOTCHART_CONF "/etc/systemd/bootchart.conf"
#define BOOTCHART_MAX (16*1024*1024)
static void parse_conf(void) {
char *init = NULL, *output = NULL;
const ConfigTableItem items[] = {
{ "Bootchart", "Samples", config_parse_int, 0, &arg_samples_len },
{ "Bootchart", "Frequency", config_parse_double, 0, &arg_hz },
{ "Bootchart", "Relative", config_parse_bool, 0, &arg_relative },
{ "Bootchart", "Filter", config_parse_bool, 0, &arg_filter },
{ "Bootchart", "Output", config_parse_path, 0, &output },
{ "Bootchart", "Init", config_parse_path, 0, &init },
{ "Bootchart", "PlotMemoryUsage", config_parse_bool, 0, &arg_pss },
{ "Bootchart", "PlotEntropyGraph", config_parse_bool, 0, &arg_entropy },
{ "Bootchart", "ScaleX", config_parse_double, 0, &arg_scale_x },
{ "Bootchart", "ScaleY", config_parse_double, 0, &arg_scale_y },
{ NULL, NULL, NULL, 0, NULL }
};
_cleanup_fclose_ FILE *f;
int r;
f = fopen(BOOTCHART_CONF, "re");
if (!f)
return;
r = config_parse(NULL, BOOTCHART_CONF, f,
NULL, config_item_table_lookup, (void*) items, true, NULL);
if (r < 0)
log_warning("Failed to parse configuration file: %s", strerror(-r));
if (init != NULL)
strscpy(arg_init_path, sizeof(arg_init_path), init);
if (output != NULL)
strscpy(arg_output_path, sizeof(arg_output_path), output);
}
static int parse_args(int argc, char *argv[]) {
static struct option options[] = {
{"rel", no_argument, NULL, 'r'},
{"freq", required_argument, NULL, 'f'},
{"samples", required_argument, NULL, 'n'},
{"pss", no_argument, NULL, 'p'},
{"output", required_argument, NULL, 'o'},
{"init", required_argument, NULL, 'i'},
{"no-filter", no_argument, NULL, 'F'},
{"cmdline", no_argument, NULL, 'C'},
{"help", no_argument, NULL, 'h'},
{"scale-x", required_argument, NULL, 'x'},
{"scale-y", required_argument, NULL, 'y'},
{"entropy", no_argument, NULL, 'e'},
{NULL, 0, NULL, 0}
};
int c;
while ((c = getopt_long(argc, argv, "erpf:n:o:i:FChx:y:", options, NULL)) >= 0) {
int r;
switch (c) {
case 'r':
arg_relative = true;
break;
case 'f':
r = safe_atod(optarg, &arg_hz);
if (r < 0)
log_warning("failed to parse --freq/-f argument '%s': %s",
optarg, strerror(-r));
break;
case 'F':
arg_filter = false;
break;
case 'C':
arg_show_cmdline = true;
break;
case 'n':
r = safe_atoi(optarg, &arg_samples_len);
if (r < 0)
log_warning("failed to parse --samples/-n argument '%s': %s",
optarg, strerror(-r));
break;
case 'o':
path_kill_slashes(optarg);
strscpy(arg_output_path, sizeof(arg_output_path), optarg);
break;
case 'i':
path_kill_slashes(optarg);
strscpy(arg_init_path, sizeof(arg_init_path), optarg);
break;
case 'p':
arg_pss = true;
break;
case 'x':
r = safe_atod(optarg, &arg_scale_x);
if (r < 0)
log_warning("failed to parse --scale-x/-x argument '%s': %s",
optarg, strerror(-r));
break;
case 'y':
r = safe_atod(optarg, &arg_scale_y);
if (r < 0)
log_warning("failed to parse --scale-y/-y argument '%s': %s",
optarg, strerror(-r));
break;
case 'e':
arg_entropy = true;
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 f Sample frequency [%f]\n", arg_hz);
fprintf(stderr, " --samples, -n N Stop sampling at [%d] samples\n", arg_samples_len);
fprintf(stderr, " --scale-x, -x N Scale the graph horizontally [%f] \n", arg_scale_x);
fprintf(stderr, " --scale-y, -y N Scale the graph vertically [%f] \n", arg_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", arg_output_path);
fprintf(stderr, " --init, -i [PATH] Path to init executable [%s]\n", arg_init_path);
fprintf(stderr, " --no-filter, -F Disable filtering of processes from the graph\n");
fprintf(stderr, " that are of less importance or short-lived\n");
fprintf(stderr, " --cmdline, -C Display the full command line with arguments\n");
fprintf(stderr, " of processes, instead of only the process name\n");
fprintf(stderr, " --help, -h Display this message\n");
fprintf(stderr, "See bootchart.conf for more information.\n");
exit (EXIT_SUCCESS);
break;
default:
break;
}
}
if (arg_samples_len > MAXSAMPLES) {
fprintf(stderr, "Error: samples exceeds maximum\n");
return -EINVAL;
}
if (arg_hz <= 0.0) {
fprintf(stderr, "Error: Frequency needs to be > 0\n");
return -EINVAL;
}
return 0;
}
static void do_journal_append(char *file)
{
struct iovec iovec[5];
int r, f, j = 0;
ssize_t n;
_cleanup_free_ char *bootchart_file = NULL, *bootchart_message = NULL,
*p = NULL;
bootchart_file = strappend("BOOTCHART_FILE=", file);
if (bootchart_file)
IOVEC_SET_STRING(iovec[j++], bootchart_file);
IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=9f26aa562cf440c2b16c773d0479b518");
IOVEC_SET_STRING(iovec[j++], "PRIORITY=7");
bootchart_message = strjoin("MESSAGE=Bootchart created: ", file, NULL);
if (bootchart_message)
IOVEC_SET_STRING(iovec[j++], bootchart_message);
p = malloc(9 + BOOTCHART_MAX);
if (!p) {
r = log_oom();
return;
}
memcpy(p, "BOOTCHART=", 10);
f = open(file, O_RDONLY);
if (f < 0) {
log_error("Failed to read bootchart data: %m\n");
return;
}
n = loop_read(f, p + 10, BOOTCHART_MAX, false);
if (n < 0) {
log_error("Failed to read bootchart data: %s\n", strerror(-n));
close(f);
return;
}
close(f);
iovec[j].iov_base = p;
iovec[j].iov_len = 10 + n;
j++;
r = sd_journal_sendv(iovec, j);
if (r < 0)
log_error("Failed to send bootchart: %s", strerror(-r));
}
int main(int argc, char *argv[]) {
_cleanup_free_ char *build = NULL;
struct sigaction sig = {
.sa_handler = signal_handler,
};
struct ps_struct *ps;
char output_file[PATH_MAX];
char datestr[200];
time_t t = 0;
int r;
struct rlimit rlim;
parse_conf();
r = parse_args(argc, argv);
if (r < 0)
return EXIT_FAILURE;
/*
* If the kernel executed us through init=/usr/lib/systemd/systemd-bootchart, 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(arg_init_path, arg_init_path, NULL);
}
}
argv[0][0] = '@';
rlim.rlim_cur = 4096;
rlim.rlim_max = 4096;
(void) setrlimit(RLIMIT_NOFILE, &rlim);
/* start with empty ps LL */
ps_first = calloc(1, sizeof(struct ps_struct));
if (!ps_first) {
perror("calloc(ps_struct)");
exit(EXIT_FAILURE);
}
/* handle TERM/INT nicely */
sigaction(SIGHUP, &sig, NULL);
interval = (1.0 / arg_hz) * 1000000000.0;
log_uptime();
/* main program loop */
for (samples = 0; !exiting && samples < arg_samples_len; samples++) {
int res;
double sample_stop;
struct timespec req;
time_t newint_s;
long newint_ns;
double elapsed;
double timeleft;
sampletime[samples] = gettime_ns();
if (!of && (access(arg_output_path, R_OK|W_OK|X_OK) == 0)) {
t = time(NULL);
strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", arg_output_path, datestr);
of = fopen(output_file, "w");
}
if (sysfd < 0)
sysfd = open("/sys", O_RDONLY);
if (!build)
parse_env_file("/etc/os-release", NEWLINE,
"PRETTY_NAME", &build,
NULL);
/* wait for /proc to become available, discarding samples */
if (graph_start <= 0.0)
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 */
arg_samples_len -= (int)(newint_ns / interval);
}
}
/* 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);
}
if (!of) {
t = time(NULL);
strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", arg_output_path, datestr);
of = fopen(output_file, "w");
}
if (!of) {
fprintf(stderr, "opening output file '%s': %m\n", output_file);
exit (EXIT_FAILURE);
}
svg_do(build);
fprintf(stderr, "systemd-bootchart wrote %s\n", output_file);
do_journal_append(output_file);
if (of)
fclose(of);
closedir(proc);
if (sysfd >= 0)
close(sysfd);
/* 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, "systemd-boochart: Warning: sample time overrun %i times\n", overrun);
return 0;
}
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