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` ($cpucount)
32 //config: system.kernel.options = `cat /proc/cmdline`
33 //config: This data is not mandatory for bootchart graph generation,
34 //config: and is considered bloat. Nevertheless, this option
35 //config: makes bootchartd applet to dump a subset of it.
37 //config:config FEATURE_BOOTCHARTD_CONFIG_FILE
38 //config: bool "bootchartd"
40 //config: depends on BOOTCHARTD
42 //config: Create extended header file compatible with "big" bootchartd.
43 //config: "Big" bootchartd is a shell script and it dumps some
44 //config: "convenient" info int the header, such as:
45 //config: title = Boot chart for `hostname` (`date`)
46 //config: system.uname = `uname -srvm`
47 //config: system.release = `cat /etc/DISTRO-release`
48 //config: system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
49 //config: system.kernel.options = `cat /proc/cmdline`
50 //config: This data is not mandatory for bootchart graph generation,
51 //config: and is considered bloat. Nevertheless, this option
52 //config: makes bootchartd applet to dump a subset of it.
55 /* After libbb.h, since it needs sys/types.h on some systems */
56 #include <sys/utsname.h>
57 #include <sys/mount.h>
59 # define MS_SILENT (1 << 15)
62 # define MNT_DETACH 0x00000002
65 #define BC_VERSION_STR "0.8"
67 /* For debugging, set to 0:
68 * strace won't work with DO_SIGNAL_SYNC set to 1.
70 #define DO_SIGNAL_SYNC 1
73 //$PWD/bootchartd.conf and /etc/bootchartd.conf:
75 //# Sampling period (in seconds)
80 //# (32 MB should suffice for ~20 minutes worth of log data, but YMMV)
83 //# Whether to enable and store BSD process accounting information. The
84 //# kernel needs to be configured to enable v3 accounting
85 //# (CONFIG_BSD_PROCESS_ACCT_V3). accton from the GNU accounting utilities
87 //PROCESS_ACCOUNTING="no"
89 //# Tarball for the various boot log files
90 //BOOTLOG_DEST=/var/log/bootchart.tgz
92 //# Whether to automatically stop logging as the boot process completes.
93 //# The logger will look for known processes that indicate bootup completion
94 //# at a specific runlevel (e.g. gdm-binary, mingetty, etc.).
95 //AUTO_STOP_LOGGER="yes"
97 //# Whether to automatically generate the boot chart once the boot logger
98 //# completes. The boot chart will be generated in $AUTO_RENDER_DIR.
99 //# Note that the bootchart package must be installed.
102 //# Image format to use for the auto-generated boot chart
103 //# (choose between png, svg and eps).
104 //AUTO_RENDER_FORMAT="png"
106 //# Output directory for auto-generated boot charts
107 //AUTO_RENDER_DIR="/var/log"
112 char jiffy_line[COMMON_BUFSIZE];
114 #define G (*(struct globals*)&bb_common_bufsiz1)
115 #define INIT_G() do { } while (0)
117 static void dump_file(FILE *fp, const char *filename)
119 int fd = open(filename, O_RDONLY);
121 fputs(G.jiffy_line, fp);
123 bb_copyfd_eof(fd, fileno(fp));
129 static int dump_procs(FILE *fp, int look_for_login_process)
131 struct dirent *entry;
132 DIR *dir = opendir("/proc");
133 int found_login_process = 0;
135 fputs(G.jiffy_line, fp);
136 while ((entry = readdir(dir)) != NULL) {
137 char name[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
139 unsigned pid = bb_strtou(entry->d_name, NULL, 10);
143 /* Android's version reads /proc/PID/cmdline and extracts
144 * non-truncated process name. Do we want to do that? */
146 sprintf(name, "/proc/%u/stat", pid);
147 stat_fd = open(name, O_RDONLY);
150 char stat_line[4*1024];
151 int rd = safe_read(stat_fd, stat_line, sizeof(stat_line)-2);
156 stat_line[rd] = '\0';
157 p = strchrnul(stat_line, '\n');
160 fputs(stat_line, fp);
161 if (!look_for_login_process)
163 p = strchr(stat_line, '(');
167 strchrnul(p, ')')[0] = '\0';
168 /* If is gdm, kdm or a getty? */
169 if (((p[0] == 'g' || p[0] == 'k' || p[0] == 'x') && p[1] == 'd' && p[2] == 'm')
170 || strstr(p, "getty")
172 found_login_process = 1;
178 return found_login_process;
181 static char *make_tempdir(void)
183 char template[] = "/tmp/bootchart.XXXXXX";
184 char *tempdir = xstrdup(mkdtemp(template));
186 /* /tmp is not writable (happens when we are used as init).
187 * Try to mount a tmpfs, them cd and lazily unmount it.
188 * Since we unmount it at once, we can mount it anywhere.
189 * Try a few locations which are likely ti exist.
191 static const char dirs[] = "/mnt\0""/tmp\0""/boot\0""/proc\0";
192 const char *try_dir = dirs;
193 while (mount("none", try_dir, "tmpfs", MS_SILENT, "size=16m") != 0) {
194 try_dir += strlen(try_dir) + 1;
196 bb_perror_msg_and_die("can't %smount tmpfs", "");
198 //bb_error_msg("mounted tmpfs on %s", try_dir);
200 if (umount2(try_dir, MNT_DETACH) != 0) {
201 bb_perror_msg_and_die("can't %smount tmpfs", "un");
209 static void do_logging(int sample_pariod_us)
211 //# Enable process accounting if configured
212 //if [ "$PROCESS_ACCOUNTING" = "yes" ]; then
213 // [ -e kernel_pacct ] || : > kernel_pacct
214 // accton kernel_pacct
217 FILE *proc_stat = xfopen("proc_stat.log", "w");
218 FILE *proc_diskstats = xfopen("proc_diskstats.log", "w");
219 //FILE *proc_netdev = xfopen("proc_netdev.log", "w");
220 FILE *proc_ps = xfopen("proc_ps.log", "w");
221 int look_for_login_process = (getppid() == 1);
222 unsigned count = 60*1000*1000 / (200*1000); /* ~1 minute */
224 while (--count && !bb_got_signal) {
226 int len = open_read_close("/proc/uptime", G.jiffy_line, sizeof(G.jiffy_line)-2);
229 /* /proc/uptime has format "NNNNNN.MM NNNNNNN.MM" */
230 /* we convert it to "NNNNNNMM\n" (using first value) */
231 G.jiffy_line[len] = '\0';
232 p = strchr(G.jiffy_line, '.');
235 while (isdigit(*++p))
240 dump_file(proc_stat, "/proc/stat");
241 dump_file(proc_diskstats, "/proc/diskstats");
242 //dump_file(proc_netdev, "/proc/net/dev");
243 if (dump_procs(proc_ps, look_for_login_process)) {
244 /* dump_procs saw a getty or {g,k,x}dm
245 * stop logging in 2 seconds:
247 if (count > 2*1000*1000 / (200*1000))
248 count = 2*1000*1000 / (200*1000);
252 usleep(sample_pariod_us);
255 // [ -e kernel_pacct ] && accton off
258 static void finalize(char *tempdir, const char *prog)
260 //# Stop process accounting if configured
262 //[ -e kernel_pacct ] && pacct=kernel_pacct
264 FILE *header_fp = xfopen("header", "w");
267 fprintf(header_fp, "profile.process = %s\n", prog);
269 fputs("version = "BC_VERSION_STR"\n", header_fp);
271 if (ENABLE_FEATURE_BOOTCHARTD_BLOATED_HEADER) {
276 /* x2 for possible localized data */
277 char date_buf[sizeof("Mon Jun 21 05:29:03 CEST 2010") * 2];
278 struct utsname unamebuf;
280 hostname = safe_gethostname();
282 localtime_r(&t, &tm_time);
283 strftime(date_buf, sizeof(date_buf), "%a %b %e %H:%M:%S %Z %Y", &tm_time);
284 fprintf(header_fp, "title = Boot chart for %s (%s)\n", hostname, date_buf);
285 if (ENABLE_FEATURE_CLEAN_UP)
288 uname(&unamebuf); /* never fails */
289 /* same as uname -srvm */
290 fprintf(header_fp, "system.uname = %s %s %s %s\n",
297 //system.release = `cat /etc/DISTRO-release`
298 //system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
300 kcmdline = xmalloc_open_read_close("/proc/cmdline", NULL);
301 /* kcmdline includes trailing "\n" */
302 fprintf(header_fp, "system.kernel.options = %s", kcmdline);
303 if (ENABLE_FEATURE_CLEAN_UP)
308 /* Package log files */
309 system("tar -zcf /var/log/bootchart.tgz header *.log"); // + $pacct
310 /* Clean up (if we are not in detached tmpfs) */
313 unlink("proc_stat.log");
314 unlink("proc_diskstats.log");
315 //unlink("proc_netdev.log");
316 unlink("proc_ps.log");
320 /* shell-based bootchartd tries to run /usr/bin/bootchart if $AUTO_RENDER=yes:
321 * /usr/bin/bootchart -o "$AUTO_RENDER_DIR" -f $AUTO_RENDER_FORMAT "$BOOTLOG_DEST"
326 * bootchartd start [PROG ARGS]: start logging in background, USR1 stops it.
327 * With PROG, runs PROG, then kills background logging.
328 * bootchartd stop: same as "killall -USR1 bootchartd"
329 * bootchartd init: start logging in background
330 * Stop when getty/gdm is seen (if AUTO_STOP_LOGGER = yes).
331 * Meant to be used from init scripts.
332 * bootchartd (pid==1): as init, but then execs $bootchart_init, /init, /sbin/init
333 * Meant to be used as kernel's init process.
335 int bootchartd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
336 int bootchartd_main(int argc UNUSED_PARAM, char **argv)
338 int sample_pariod_us;
339 pid_t parent_pid, logger_pid;
345 CMD_PID1, /* used to mark pid 1 case */
350 parent_pid = getpid();
352 cmd = index_in_strings("stop\0""start\0""init\0", argv[1]);
355 if (cmd == CMD_STOP) {
356 pid_t *pidList = find_pid_by_name("bootchartd");
357 while (*pidList != 0) {
358 if (*pidList != parent_pid)
359 kill(*pidList, SIGUSR1);
370 /* Here we are in START or INIT state */
372 /* Read config file: */
373 sample_pariod_us = 200 * 1000;
374 if (ENABLE_FEATURE_BOOTCHARTD_CONFIG_FILE) {
376 parser_t *parser = config_open2("/etc/bootchartd.conf" + 5, fopen_for_read);
378 parser = config_open2("/etc/bootchartd.conf", fopen_for_read);
379 while (config_read(parser, token, 2, 0, "#=", PARSE_NORMAL & ~PARSE_COLLAPSE)) {
380 if (strcmp(token[0], "SAMPLE_PERIOD") == 0 && token[1])
381 sample_pariod_us = atof(token[1]) * 1000000;
383 config_close(parser);
386 /* Create logger child: */
387 logger_pid = fork_or_rexec(argv);
389 if (logger_pid == 0) { /* child */
402 /* Inform parent that we are ready */
405 /* If we are started by kernel, PATH might be unset.
406 * In order to find "tar", let's set some sane PATH:
408 if (cmd == CMD_PID1 && !getenv("PATH"))
409 putenv((char*)bb_PATH_root_path);
411 tempdir = make_tempdir();
412 do_logging(sample_pariod_us);
413 finalize(tempdir, cmd == CMD_START ? argv[2] : NULL);
419 if (DO_SIGNAL_SYNC) {
420 /* Wait for logger child to set handlers, then unpause it.
421 * Otherwise with short-lived PROG (e.g. "bootchartd start true")
422 * we might send SIGUSR1 before logger sets its handler.
424 waitpid(logger_pid, NULL, WUNTRACED);
425 kill(logger_pid, SIGCONT);
428 if (cmd == CMD_PID1) {
429 char *bootchart_init = getenv("bootchart_init");
431 execl(bootchart_init, bootchart_init, NULL);
432 execl("/init", "init", NULL);
433 execl("/sbin/init", "init", NULL);
434 bb_perror_msg_and_die("can't exec '%s'", "/sbin/init");
437 if (cmd == CMD_START && argv[2]) { /* "start PROG ARGS" */
440 bb_perror_msg_and_die("vfork");
441 if (pid == 0) { /* child */
443 execvp(argv[0], argv);
444 bb_perror_msg_and_die("can't exec '%s'", argv[0]);
447 waitpid(pid, NULL, 0);
448 kill(logger_pid, SIGUSR1);