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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 Corporation
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/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 <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"
#include "list.h"
static int exiting = 0;
#define DEFAULT_SAMPLES_LEN 500
#define DEFAULT_HZ 25.0
#define DEFAULT_SCALE_X 100.0 /* 100px = 1sec */
#define DEFAULT_SCALE_Y 20.0 /* 16px = 1 process bar */
#define DEFAULT_INIT ROOTLIBEXECDIR "/systemd"
#define DEFAULT_OUTPUT "/run/log"
/* graph defaults */
bool arg_entropy = false;
bool arg_initcall = true;
bool arg_relative = false;
bool arg_filter = true;
bool arg_show_cmdline = false;
bool arg_show_cgroup = false;
bool arg_pss = false;
bool arg_percpu = false;
int arg_samples_len = DEFAULT_SAMPLES_LEN; /* we record len+1 (1 start sample) */
double arg_hz = DEFAULT_HZ;
double arg_scale_x = DEFAULT_SCALE_X;
double arg_scale_y = DEFAULT_SCALE_Y;
char arg_init_path[PATH_MAX] = DEFAULT_INIT;
char arg_output_path[PATH_MAX] = DEFAULT_OUTPUT;
static void signal_handler(int 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 },
{ "Bootchart", "ControlGroup", config_parse_bool, 0, &arg_show_cgroup },
{ "Bootchart", "PerCPU", config_parse_bool, 0, &arg_percpu },
{ NULL, NULL, NULL, 0, NULL }
};
config_parse_many(BOOTCHART_CONF,
CONF_DIRS_NULSTR("systemd/bootchart.conf"),
NULL, config_item_table_lookup, items, true, NULL);
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 void help(void) {
printf("Usage: %s [OPTIONS]\n\n"
"Options:\n"
" -r --rel Record time relative to recording\n"
" -f --freq=FREQ Sample frequency [%g]\n"
" -n --samples=N Stop sampling at [%d] samples\n"
" -x --scale-x=N Scale the graph horizontally [%g] \n"
" -y --scale-y=N Scale the graph vertically [%g] \n"
" -p --pss Enable PSS graph (CPU intensive)\n"
" -e --entropy Enable the entropy_avail graph\n"
" -o --output=PATH Path to output files [%s]\n"
" -i --init=PATH Path to init executable [%s]\n"
" -F --no-filter Disable filtering of unimportant or ephemeral processes\n"
" -C --cmdline Display full command lines with arguments\n"
" -c --control-group Display process control group\n"
" --per-cpu Draw each CPU utilization and wait bar also\n"
" -h --help Display this message\n\n"
"See bootchart.conf for more information.\n",
program_invocation_short_name,
DEFAULT_HZ,
DEFAULT_SAMPLES_LEN,
DEFAULT_SCALE_X,
DEFAULT_SCALE_Y,
DEFAULT_OUTPUT,
DEFAULT_INIT);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_PERCPU = 0x100,
};
static const 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' },
{"control-group", 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' },
{"per-cpu", no_argument, NULL, ARG_PERCPU},
{}
};
int c, r;
if (getpid() == 1)
opterr = 0;
while ((c = getopt_long(argc, argv, "erpf:n:o:i:FCchx:y:", options, NULL)) >= 0)
switch (c) {
case 'r':
arg_relative = true;
break;
case 'f':
r = safe_atod(optarg, &arg_hz);
if (r < 0)
log_warning_errno(r, "failed to parse --freq/-f argument '%s': %m",
optarg);
break;
case 'F':
arg_filter = false;
break;
case 'C':
arg_show_cmdline = true;
break;
case 'c':
arg_show_cgroup = true;
break;
case 'n':
r = safe_atoi(optarg, &arg_samples_len);
if (r < 0)
log_warning_errno(r, "failed to parse --samples/-n argument '%s': %m",
optarg);
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_errno(r, "failed to parse --scale-x/-x argument '%s': %m",
optarg);
break;
case 'y':
r = safe_atod(optarg, &arg_scale_y);
if (r < 0)
log_warning_errno(r, "failed to parse --scale-y/-y argument '%s': %m",
optarg);
break;
case 'e':
arg_entropy = true;
break;
case ARG_PERCPU:
arg_percpu = true;
break;
case 'h':
help();
return 0;
case '?':
if (getpid() != 1)
return -EINVAL;
else
return 0;
default:
assert_not_reached("Unhandled option code.");
}
if (arg_hz <= 0) {
log_error("Frequency needs to be > 0");
return -EINVAL;
}
return 1;
}
static int do_journal_append(char *file) {
_cleanup_free_ char *bootchart_message = NULL;
_cleanup_free_ char *bootchart_file = NULL;
_cleanup_free_ char *p = NULL;
_cleanup_close_ int fd = -1;
struct iovec iovec[5];
int r, j = 0;
ssize_t n;
bootchart_file = strappend("BOOTCHART_FILE=", file);
if (!bootchart_file)
return log_oom();
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)
return log_oom();
IOVEC_SET_STRING(iovec[j++], bootchart_message);
p = malloc(10 + BOOTCHART_MAX);
if (!p)
return log_oom();
memcpy(p, "BOOTCHART=", 10);
fd = open(file, O_RDONLY|O_CLOEXEC);
if (fd < 0)
return log_error_errno(errno, "Failed to open bootchart data \"%s\": %m", file);
n = loop_read(fd, p + 10, BOOTCHART_MAX, false);
if (n < 0)
return log_error_errno(n, "Failed to read bootchart data: %m");
iovec[j].iov_base = p;
iovec[j].iov_len = 10 + n;
j++;
r = sd_journal_sendv(iovec, j);
if (r < 0)
log_error_errno(r, "Failed to send bootchart: %m");
return 0;
}
int main(int argc, char *argv[]) {
static struct list_sample_data *sampledata;
_cleanup_closedir_ DIR *proc = NULL;
_cleanup_free_ char *build = NULL;
_cleanup_fclose_ FILE *of = NULL;
_cleanup_close_ int sysfd = -1;
struct ps_struct *ps_first;
double graph_start;
double log_start;
double interval;
char output_file[PATH_MAX];
char datestr[200];
int pscount = 0;
int n_cpus = 0;
int overrun = 0;
time_t t = 0;
int r, samples;
struct ps_struct *ps;
struct rlimit rlim;
struct list_sample_data *head;
struct sigaction sig = {
.sa_handler = signal_handler,
};
parse_conf();
r = parse_argv(argc, argv);
if (r < 0)
return EXIT_FAILURE;
if (r == 0)
return EXIT_SUCCESS;
/*
* If the kernel executed us through init=/usr/lib/systemd/systemd-bootchart, then
* fork:
* - parent execs executable specified via init_path[] (/usr/lib/systemd/systemd 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 = new0(struct ps_struct, 1);
if (!ps_first) {
log_oom();
return EXIT_FAILURE;
}
/* handle TERM/INT nicely */
sigaction(SIGHUP, &sig, NULL);
interval = (1.0 / arg_hz) * 1000000000.0;
if (arg_relative)
graph_start = log_start = gettime_ns();
else {
struct timespec n;
double uptime;
clock_gettime(clock_boottime_or_monotonic(), &n);
uptime = (n.tv_sec + (n.tv_nsec / (double) NSEC_PER_SEC));
log_start = gettime_ns();
graph_start = log_start - uptime;
}
if (graph_start < 0.0) {
log_error("Failed to setup graph start time.\n\n"
"The system uptime probably includes time that the system was suspended. "
"Use --rel to bypass this issue.");
return EXIT_FAILURE;
}
LIST_HEAD_INIT(head);
/* main program loop */
for (samples = 0; !exiting && samples < arg_samples_len; samples++) {
int res;
double sample_stop;
double elapsed;
double timeleft;
sampledata = new0(struct list_sample_data, 1);
if (sampledata == NULL) {
log_oom();
return EXIT_FAILURE;
}
sampledata->sampletime = gettime_ns();
sampledata->counter = samples;
if (sysfd < 0)
sysfd = open("/sys", O_RDONLY|O_CLOEXEC);
if (!build) {
if (parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &build, NULL) == -ENOENT)
parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &build, NULL);
}
if (proc)
rewinddir(proc);
else
proc = opendir("/proc");
/* wait for /proc to become available, discarding samples */
if (proc) {
r = log_sample(proc, samples, ps_first, &sampledata, &pscount, &n_cpus);
if (r < 0)
return EXIT_FAILURE;
}
sample_stop = gettime_ns();
elapsed = (sample_stop - sampledata->sampletime) * 1000000000.0;
timeleft = interval - elapsed;
/*
* 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 (timeleft > 0) {
struct timespec req;
req.tv_sec = (time_t)(timeleft / 1000000000.0);
req.tv_nsec = (long)(timeleft - (req.tv_sec * 1000000000.0));
res = nanosleep(&req, NULL);
if (res) {
if (errno == EINTR)
/* caught signal, probably HUP! */
break;
log_error_errno(errno, "nanosleep() failed: %m");
return EXIT_FAILURE;
}
} else {
overrun++;
/* calculate how many samples we lost and scrap them */
arg_samples_len -= (int)(-timeleft / interval);
}
LIST_PREPEND(link, head, sampledata);
}
/* do some cleanup, close fd's */
ps = ps_first;
while (ps->next_ps) {
ps = ps->next_ps;
ps->schedstat = safe_close(ps->schedstat);
ps->sched = safe_close(ps->sched);
ps->smaps = safe_fclose(ps->smaps);
}
if (!of) {
t = time(NULL);
r = strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
assert_se(r > 0);
snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", arg_output_path, datestr);
of = fopen(output_file, "we");
}
if (!of) {
log_error("Error opening output file '%s': %m\n", output_file);
return EXIT_FAILURE;
}
r = svg_do(of, strna(build), head, ps_first,
samples, pscount, n_cpus, graph_start,
log_start, interval, overrun);
if (r < 0) {
log_error_errno(r, "Error generating svg file: %m");
return EXIT_FAILURE;
}
log_info("systemd-bootchart wrote %s\n", output_file);
r = do_journal_append(output_file);
if (r < 0)
return EXIT_FAILURE;
/* nitpic cleanups */
ps = ps_first->next_ps;
while (ps->next_ps) {
struct ps_struct *old;
old = ps;
old->sample = ps->first;
ps = ps->next_ps;
while (old->sample->next) {
struct ps_sched_struct *oldsample = old->sample;
old->sample = old->sample->next;
free(oldsample);
}
free(old->cgroup);
free(old->sample);
free(old);
}
free(ps->cgroup);
free(ps->sample);
free(ps);
sampledata = head;
while (sampledata->link_prev) {
struct list_sample_data *old_sampledata = sampledata;
sampledata = sampledata->link_prev;
free(old_sampledata);
}
free(sampledata);
/* don't complain when overrun once, happens most commonly on 1st sample */
if (overrun > 1)
log_warning("systemd-bootchart: sample time overrun %i times\n", overrun);
return 0;
}
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