1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
6 //config:config BOOTCHARTD
7 //config: bool "bootchartd"
10 //config: bootchartd is commonly used to profile the boot process
11 //config: for the purpose of speeding it up. In this case, it is started
12 //config: by the kernel as the init process. This is configured by adding
13 //config: the init=/sbin/bootchartd option to the kernel command line.
15 //config: It can also be used to monitor the resource usage of a specific
16 //config: application or the running system in general. In this case,
17 //config: bootchartd is started interactively by running bootchartd start
18 //config: and stopped using bootchartd stop.
20 //config:config FEATURE_BOOTCHARTD_BLOATED_HEADER
21 //config: bool "bootchartd"
23 //config: depends on BOOTCHARTD
25 //config: Create extended header file compatible with "big" bootchartd.
26 //config: "Big" bootchartd is a shell script and it dumps some
27 //config: "convenient" info int the header, such as:
28 //config: title = Boot chart for `hostname` (`date`)
29 //config: system.uname = `uname -srvm`
30 //config: system.release = `cat /etc/DISTRO-release`
31 //config: system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
32 //config: system.kernel.options = `cat /proc/cmdline`
33 //config: This data is not mandatory for bootchart graph generation,
34 //config: and is considered bloat. Nevertheless, this option
35 //config: makes bootchartd applet to dump a subset of it.
37 //config:config FEATURE_BOOTCHARTD_CONFIG_FILE
38 //config: bool "bootchartd"
40 //config: depends on BOOTCHARTD
42 //config: Enable reading and parsing of $PWD/bootchartd.conf
43 //config: and /etc/bootchartd.conf files.
46 /* After libbb.h, since it needs sys/types.h on some systems */
47 #include <sys/utsname.h>
48 #include <sys/mount.h>
50 # define MS_SILENT (1 << 15)
53 # define MNT_DETACH 0x00000002
56 #define BC_VERSION_STR "0.8"
58 /* For debugging, set to 0:
59 * strace won't work with DO_SIGNAL_SYNC set to 1.
61 #define DO_SIGNAL_SYNC 1
64 //$PWD/bootchartd.conf and /etc/bootchartd.conf:
66 //# Sampling period (in seconds)
71 //# (32 MB should suffice for ~20 minutes worth of log data, but YMMV)
74 //# Whether to enable and store BSD process accounting information. The
75 //# kernel needs to be configured to enable v3 accounting
76 //# (CONFIG_BSD_PROCESS_ACCT_V3). accton from the GNU accounting utilities
78 //PROCESS_ACCOUNTING="no"
80 //# Tarball for the various boot log files
81 //BOOTLOG_DEST=/var/log/bootchart.tgz
83 //# Whether to automatically stop logging as the boot process completes.
84 //# The logger will look for known processes that indicate bootup completion
85 //# at a specific runlevel (e.g. gdm-binary, mingetty, etc.).
86 //AUTO_STOP_LOGGER="yes"
88 //# Whether to automatically generate the boot chart once the boot logger
89 //# completes. The boot chart will be generated in $AUTO_RENDER_DIR.
90 //# Note that the bootchart package must be installed.
93 //# Image format to use for the auto-generated boot chart
94 //# (choose between png, svg and eps).
95 //AUTO_RENDER_FORMAT="png"
97 //# Output directory for auto-generated boot charts
98 //AUTO_RENDER_DIR="/var/log"
103 char jiffy_line[COMMON_BUFSIZE];
105 #define G (*(struct globals*)&bb_common_bufsiz1)
106 #define INIT_G() do { } while (0)
108 static void dump_file(FILE *fp, const char *filename)
110 int fd = open(filename, O_RDONLY);
112 fputs(G.jiffy_line, fp);
114 bb_copyfd_eof(fd, fileno(fp));
120 static int dump_procs(FILE *fp, int look_for_login_process)
122 struct dirent *entry;
123 DIR *dir = opendir("/proc");
124 int found_login_process = 0;
126 fputs(G.jiffy_line, fp);
127 while ((entry = readdir(dir)) != NULL) {
128 char name[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
130 unsigned pid = bb_strtou(entry->d_name, NULL, 10);
134 /* Android's version reads /proc/PID/cmdline and extracts
135 * non-truncated process name. Do we want to do that? */
137 sprintf(name, "/proc/%u/stat", pid);
138 stat_fd = open(name, O_RDONLY);
141 char stat_line[4*1024];
142 int rd = safe_read(stat_fd, stat_line, sizeof(stat_line)-2);
147 stat_line[rd] = '\0';
148 p = strchrnul(stat_line, '\n');
151 fputs(stat_line, fp);
152 if (!look_for_login_process)
154 p = strchr(stat_line, '(');
158 strchrnul(p, ')')[0] = '\0';
159 /* Is it gdm, kdm or a getty? */
160 if (((p[0] == 'g' || p[0] == 'k' || p[0] == 'x') && p[1] == 'd' && p[2] == 'm')
161 || strstr(p, "getty")
163 found_login_process = 1;
169 return found_login_process;
172 static char *make_tempdir(void)
174 char template[] = "/tmp/bootchart.XXXXXX";
175 char *tempdir = xstrdup(mkdtemp(template));
177 /* /tmp is not writable (happens when we are used as init).
178 * Try to mount a tmpfs, them cd and lazily unmount it.
179 * Since we unmount it at once, we can mount it anywhere.
180 * Try a few locations which are likely ti exist.
182 static const char dirs[] = "/mnt\0""/tmp\0""/boot\0""/proc\0";
183 const char *try_dir = dirs;
184 while (mount("none", try_dir, "tmpfs", MS_SILENT, "size=16m") != 0) {
185 try_dir += strlen(try_dir) + 1;
187 bb_perror_msg_and_die("can't %smount tmpfs", "");
189 //bb_error_msg("mounted tmpfs on %s", try_dir);
191 if (umount2(try_dir, MNT_DETACH) != 0) {
192 bb_perror_msg_and_die("can't %smount tmpfs", "un");
200 static void do_logging(unsigned sample_period_us)
202 //# Enable process accounting if configured
203 //if [ "$PROCESS_ACCOUNTING" = "yes" ]; then
204 // [ -e kernel_pacct ] || : > kernel_pacct
205 // accton kernel_pacct
208 FILE *proc_stat = xfopen("proc_stat.log", "w");
209 FILE *proc_diskstats = xfopen("proc_diskstats.log", "w");
210 //FILE *proc_netdev = xfopen("proc_netdev.log", "w");
211 FILE *proc_ps = xfopen("proc_ps.log", "w");
212 int look_for_login_process = (getppid() == 1);
213 unsigned count = 60*1000*1000 / sample_period_us; /* ~1 minute */
215 while (--count && !bb_got_signal) {
217 int len = open_read_close("/proc/uptime", G.jiffy_line, sizeof(G.jiffy_line)-2);
220 /* /proc/uptime has format "NNNNNN.MM NNNNNNN.MM" */
221 /* we convert it to "NNNNNNMM\n" (using first value) */
222 G.jiffy_line[len] = '\0';
223 p = strchr(G.jiffy_line, '.');
226 while (isdigit(*++p))
231 dump_file(proc_stat, "/proc/stat");
232 dump_file(proc_diskstats, "/proc/diskstats");
233 //dump_file(proc_netdev, "/proc/net/dev");
234 if (dump_procs(proc_ps, look_for_login_process)) {
235 /* dump_procs saw a getty or {g,k,x}dm
236 * stop logging in 2 seconds:
238 if (count > 2*1000*1000 / sample_period_us)
239 count = 2*1000*1000 / sample_period_us;
243 usleep(sample_period_us);
246 // [ -e kernel_pacct ] && accton off
249 static void finalize(char *tempdir, const char *prog)
251 //# Stop process accounting if configured
253 //[ -e kernel_pacct ] && pacct=kernel_pacct
255 FILE *header_fp = xfopen("header", "w");
258 fprintf(header_fp, "profile.process = %s\n", prog);
260 fputs("version = "BC_VERSION_STR"\n", header_fp);
261 if (ENABLE_FEATURE_BOOTCHARTD_BLOATED_HEADER) {
266 /* x2 for possible localized weekday/month names */
267 char date_buf[sizeof("Mon Jun 21 05:29:03 CEST 2010") * 2];
268 struct utsname unamebuf;
270 hostname = safe_gethostname();
272 localtime_r(&t, &tm_time);
273 strftime(date_buf, sizeof(date_buf), "%a %b %e %H:%M:%S %Z %Y", &tm_time);
274 fprintf(header_fp, "title = Boot chart for %s (%s)\n", hostname, date_buf);
275 if (ENABLE_FEATURE_CLEAN_UP)
278 uname(&unamebuf); /* never fails */
279 /* same as uname -srvm */
280 fprintf(header_fp, "system.uname = %s %s %s %s\n",
287 //system.release = `cat /etc/DISTRO-release`
288 //system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
290 kcmdline = xmalloc_open_read_close("/proc/cmdline", NULL);
291 /* kcmdline includes trailing "\n" */
292 fprintf(header_fp, "system.kernel.options = %s", kcmdline);
293 if (ENABLE_FEATURE_CLEAN_UP)
298 /* Package log files */
299 system("tar -zcf /var/log/bootchart.tgz header *.log"); // + $pacct
300 /* Clean up (if we are not in detached tmpfs) */
303 unlink("proc_stat.log");
304 unlink("proc_diskstats.log");
305 //unlink("proc_netdev.log");
306 unlink("proc_ps.log");
310 /* shell-based bootchartd tries to run /usr/bin/bootchart if $AUTO_RENDER=yes:
311 * /usr/bin/bootchart -o "$AUTO_RENDER_DIR" -f $AUTO_RENDER_FORMAT "$BOOTLOG_DEST"
315 //usage:#define bootchartd_trivial_usage
316 //usage: "start [PROG ARGS]|stop|init"
317 //usage:#define bootchartd_full_usage "\n\n"
318 //usage: "Create /var/log/bootchart.tgz with boot chart data\n"
319 //usage: "\nOptions:"
320 //usage: "\nstart: start background logging; with PROG, run PROG, then kill logging with USR1"
321 //usage: "\nstop: send USR1 to all bootchartd processes"
322 //usage: "\ninit: start background logging; stop when getty/xdm is seen (for init scripts)"
323 //usage: "\nUnder PID 1: as init, then exec $bootchart_init, /init, /sbin/init"
325 int bootchartd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
326 int bootchartd_main(int argc UNUSED_PARAM, char **argv)
328 unsigned sample_period_us;
329 pid_t parent_pid, logger_pid;
335 CMD_PID1, /* used to mark pid 1 case */
340 parent_pid = getpid();
342 cmd = index_in_strings("stop\0""start\0""init\0", argv[1]);
345 if (cmd == CMD_STOP) {
346 pid_t *pidList = find_pid_by_name("bootchartd");
347 while (*pidList != 0) {
348 if (*pidList != parent_pid)
349 kill(*pidList, SIGUSR1);
360 /* Here we are in START, INIT or CMD_PID1 state */
362 /* Read config file: */
363 sample_period_us = 200 * 1000;
364 if (ENABLE_FEATURE_BOOTCHARTD_CONFIG_FILE) {
366 parser_t *parser = config_open2("/etc/bootchartd.conf" + 5, fopen_for_read);
368 parser = config_open2("/etc/bootchartd.conf", fopen_for_read);
369 while (config_read(parser, token, 2, 0, "#=", PARSE_NORMAL & ~PARSE_COLLAPSE)) {
370 if (strcmp(token[0], "SAMPLE_PERIOD") == 0 && token[1])
371 sample_period_us = atof(token[1]) * 1000000;
373 config_close(parser);
375 if ((int)sample_period_us <= 0)
376 sample_period_us = 1; /* prevent division by 0 */
378 /* Create logger child: */
379 logger_pid = fork_or_rexec(argv);
381 if (logger_pid == 0) { /* child */
394 /* Inform parent that we are ready */
397 /* If we are started by kernel, PATH might be unset.
398 * In order to find "tar", let's set some sane PATH:
400 if (cmd == CMD_PID1 && !getenv("PATH"))
401 putenv((char*)bb_PATH_root_path);
403 tempdir = make_tempdir();
404 do_logging(sample_period_us);
405 finalize(tempdir, cmd == CMD_START ? argv[2] : NULL);
411 if (DO_SIGNAL_SYNC) {
412 /* Wait for logger child to set handlers, then unpause it.
413 * Otherwise with short-lived PROG (e.g. "bootchartd start true")
414 * we might send SIGUSR1 before logger sets its handler.
416 waitpid(logger_pid, NULL, WUNTRACED);
417 kill(logger_pid, SIGCONT);
420 if (cmd == CMD_PID1) {
421 char *bootchart_init = getenv("bootchart_init");
423 execl(bootchart_init, bootchart_init, NULL);
424 execl("/init", "init", NULL);
425 execl("/sbin/init", "init", NULL);
426 bb_perror_msg_and_die("can't execute '%s'", "/sbin/init");
429 if (cmd == CMD_START && argv[2]) { /* "start PROG ARGS" */
432 bb_perror_msg_and_die("vfork");
433 if (pid == 0) { /* child */
435 execvp(argv[0], argv);
436 bb_perror_msg_and_die("can't execute '%s'", argv[0]);
439 waitpid(pid, NULL, 0);
440 kill(logger_pid, SIGUSR1);