Contents of /tags/mkinitrd-6_5_1/busybox/init/bootchartd.c
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Wed Sep 7 17:51:16 2011 UTC (13 years ago) by niro
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Wed Sep 7 17:51:16 2011 UTC (13 years ago) by niro
File MIME type: text/plain
File size: 12975 byte(s)
tagged 'mkinitrd-6_5_1'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
4 | */ |
5 | |
6 | //config:config BOOTCHARTD |
7 | //config: bool "bootchartd" |
8 | //config: default y |
9 | //config: help |
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. |
14 | //config: |
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. |
19 | //config: |
20 | //config:config FEATURE_BOOTCHARTD_BLOATED_HEADER |
21 | //config: bool "Compatible, bloated header" |
22 | //config: default y |
23 | //config: depends on BOOTCHARTD |
24 | //config: help |
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. |
36 | //config: |
37 | //config:config FEATURE_BOOTCHARTD_CONFIG_FILE |
38 | //config: bool "Support bootchartd.conf" |
39 | //config: default y |
40 | //config: depends on BOOTCHARTD |
41 | //config: help |
42 | //config: Enable reading and parsing of $PWD/bootchartd.conf |
43 | //config: and /etc/bootchartd.conf files. |
44 | |
45 | #include "libbb.h" |
46 | /* After libbb.h, since it needs sys/types.h on some systems */ |
47 | #include <sys/utsname.h> |
48 | #include <sys/mount.h> |
49 | #ifndef MS_SILENT |
50 | # define MS_SILENT (1 << 15) |
51 | #endif |
52 | #ifndef MNT_DETACH |
53 | # define MNT_DETACH 0x00000002 |
54 | #endif |
55 | |
56 | #define BC_VERSION_STR "0.8" |
57 | |
58 | /* For debugging, set to 0: |
59 | * strace won't work with DO_SIGNAL_SYNC set to 1. |
60 | */ |
61 | #define DO_SIGNAL_SYNC 1 |
62 | |
63 | |
64 | //$PWD/bootchartd.conf and /etc/bootchartd.conf: |
65 | //supported options: |
66 | //# Sampling period (in seconds) |
67 | //SAMPLE_PERIOD=0.2 |
68 | // |
69 | //not yet supported: |
70 | //# tmpfs size |
71 | //# (32 MB should suffice for ~20 minutes worth of log data, but YMMV) |
72 | //TMPFS_SIZE=32m |
73 | // |
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 |
77 | //# is also required. |
78 | //PROCESS_ACCOUNTING="no" |
79 | // |
80 | //# Tarball for the various boot log files |
81 | //BOOTLOG_DEST=/var/log/bootchart.tgz |
82 | // |
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" |
87 | // |
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. |
91 | //AUTO_RENDER="no" |
92 | // |
93 | //# Image format to use for the auto-generated boot chart |
94 | //# (choose between png, svg and eps). |
95 | //AUTO_RENDER_FORMAT="png" |
96 | // |
97 | //# Output directory for auto-generated boot charts |
98 | //AUTO_RENDER_DIR="/var/log" |
99 | |
100 | |
101 | /* Globals */ |
102 | struct globals { |
103 | char jiffy_line[COMMON_BUFSIZE]; |
104 | } FIX_ALIASING; |
105 | #define G (*(struct globals*)&bb_common_bufsiz1) |
106 | #define INIT_G() do { } while (0) |
107 | |
108 | static void dump_file(FILE *fp, const char *filename) |
109 | { |
110 | int fd = open(filename, O_RDONLY); |
111 | if (fd >= 0) { |
112 | fputs(G.jiffy_line, fp); |
113 | fflush(fp); |
114 | bb_copyfd_eof(fd, fileno(fp)); |
115 | close(fd); |
116 | fputc('\n', fp); |
117 | } |
118 | } |
119 | |
120 | static int dump_procs(FILE *fp, int look_for_login_process) |
121 | { |
122 | struct dirent *entry; |
123 | DIR *dir = opendir("/proc"); |
124 | int found_login_process = 0; |
125 | |
126 | fputs(G.jiffy_line, fp); |
127 | while ((entry = readdir(dir)) != NULL) { |
128 | char name[sizeof("/proc/%u/cmdline") + sizeof(int)*3]; |
129 | int stat_fd; |
130 | unsigned pid = bb_strtou(entry->d_name, NULL, 10); |
131 | if (errno) |
132 | continue; |
133 | |
134 | /* Android's version reads /proc/PID/cmdline and extracts |
135 | * non-truncated process name. Do we want to do that? */ |
136 | |
137 | sprintf(name, "/proc/%u/stat", pid); |
138 | stat_fd = open(name, O_RDONLY); |
139 | if (stat_fd >= 0) { |
140 | char *p; |
141 | char stat_line[4*1024]; |
142 | int rd = safe_read(stat_fd, stat_line, sizeof(stat_line)-2); |
143 | |
144 | close(stat_fd); |
145 | if (rd < 0) |
146 | continue; |
147 | stat_line[rd] = '\0'; |
148 | p = strchrnul(stat_line, '\n'); |
149 | *p++ = '\n'; |
150 | *p = '\0'; |
151 | fputs(stat_line, fp); |
152 | if (!look_for_login_process) |
153 | continue; |
154 | p = strchr(stat_line, '('); |
155 | if (!p) |
156 | continue; |
157 | p++; |
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") |
162 | ) { |
163 | found_login_process = 1; |
164 | } |
165 | } |
166 | } |
167 | closedir(dir); |
168 | fputc('\n', fp); |
169 | return found_login_process; |
170 | } |
171 | |
172 | static char *make_tempdir(void) |
173 | { |
174 | char template[] = "/tmp/bootchart.XXXXXX"; |
175 | char *tempdir = xstrdup(mkdtemp(template)); |
176 | if (!tempdir) { |
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. |
181 | */ |
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; |
186 | if (!try_dir[0]) |
187 | bb_perror_msg_and_die("can't %smount tmpfs", ""); |
188 | } |
189 | //bb_error_msg("mounted tmpfs on %s", try_dir); |
190 | xchdir(try_dir); |
191 | if (umount2(try_dir, MNT_DETACH) != 0) { |
192 | bb_perror_msg_and_die("can't %smount tmpfs", "un"); |
193 | } |
194 | } else { |
195 | xchdir(tempdir); |
196 | } |
197 | return tempdir; |
198 | } |
199 | |
200 | static void do_logging(unsigned sample_period_us) |
201 | { |
202 | //# Enable process accounting if configured |
203 | //if [ "$PROCESS_ACCOUNTING" = "yes" ]; then |
204 | // [ -e kernel_pacct ] || : > kernel_pacct |
205 | // accton kernel_pacct |
206 | //fi |
207 | |
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 */ |
214 | |
215 | while (--count && !bb_got_signal) { |
216 | char *p; |
217 | int len = open_read_close("/proc/uptime", G.jiffy_line, sizeof(G.jiffy_line)-2); |
218 | if (len < 0) |
219 | goto wait_more; |
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, '.'); |
224 | if (!p) |
225 | goto wait_more; |
226 | while (isdigit(*++p)) |
227 | p[-1] = *p; |
228 | p[-1] = '\n'; |
229 | p[0] = '\0'; |
230 | |
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: |
237 | */ |
238 | if (count > 2*1000*1000 / sample_period_us) |
239 | count = 2*1000*1000 / sample_period_us; |
240 | } |
241 | fflush_all(); |
242 | wait_more: |
243 | usleep(sample_period_us); |
244 | } |
245 | |
246 | // [ -e kernel_pacct ] && accton off |
247 | } |
248 | |
249 | static void finalize(char *tempdir, const char *prog) |
250 | { |
251 | //# Stop process accounting if configured |
252 | //local pacct= |
253 | //[ -e kernel_pacct ] && pacct=kernel_pacct |
254 | |
255 | FILE *header_fp = xfopen("header", "w"); |
256 | |
257 | if (prog) |
258 | fprintf(header_fp, "profile.process = %s\n", prog); |
259 | |
260 | fputs("version = "BC_VERSION_STR"\n", header_fp); |
261 | if (ENABLE_FEATURE_BOOTCHARTD_BLOATED_HEADER) { |
262 | char *hostname; |
263 | char *kcmdline; |
264 | time_t t; |
265 | struct tm tm_time; |
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; |
269 | |
270 | hostname = safe_gethostname(); |
271 | time(&t); |
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) |
276 | free(hostname); |
277 | |
278 | uname(&unamebuf); /* never fails */ |
279 | /* same as uname -srvm */ |
280 | fprintf(header_fp, "system.uname = %s %s %s %s\n", |
281 | unamebuf.sysname, |
282 | unamebuf.release, |
283 | unamebuf.version, |
284 | unamebuf.machine |
285 | ); |
286 | |
287 | //system.release = `cat /etc/DISTRO-release` |
288 | //system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount) |
289 | |
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) |
294 | free(kcmdline); |
295 | } |
296 | fclose(header_fp); |
297 | |
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) */ |
301 | if (tempdir) { |
302 | unlink("header"); |
303 | unlink("proc_stat.log"); |
304 | unlink("proc_diskstats.log"); |
305 | //unlink("proc_netdev.log"); |
306 | unlink("proc_ps.log"); |
307 | rmdir(tempdir); |
308 | } |
309 | |
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" |
312 | */ |
313 | } |
314 | |
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" |
324 | |
325 | int bootchartd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
326 | int bootchartd_main(int argc UNUSED_PARAM, char **argv) |
327 | { |
328 | unsigned sample_period_us; |
329 | pid_t parent_pid, logger_pid; |
330 | smallint cmd; |
331 | enum { |
332 | CMD_STOP = 0, |
333 | CMD_START, |
334 | CMD_INIT, |
335 | CMD_PID1, /* used to mark pid 1 case */ |
336 | }; |
337 | |
338 | INIT_G(); |
339 | |
340 | parent_pid = getpid(); |
341 | if (argv[1]) { |
342 | cmd = index_in_strings("stop\0""start\0""init\0", argv[1]); |
343 | if (cmd < 0) |
344 | bb_show_usage(); |
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); |
350 | pidList++; |
351 | } |
352 | return EXIT_SUCCESS; |
353 | } |
354 | } else { |
355 | if (parent_pid != 1) |
356 | bb_show_usage(); |
357 | cmd = CMD_PID1; |
358 | } |
359 | |
360 | /* Here we are in START, INIT or CMD_PID1 state */ |
361 | |
362 | /* Read config file: */ |
363 | sample_period_us = 200 * 1000; |
364 | if (ENABLE_FEATURE_BOOTCHARTD_CONFIG_FILE) { |
365 | char* token[2]; |
366 | parser_t *parser = config_open2("/etc/bootchartd.conf" + 5, fopen_for_read); |
367 | if (!parser) |
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; |
372 | } |
373 | config_close(parser); |
374 | } |
375 | if ((int)sample_period_us <= 0) |
376 | sample_period_us = 1; /* prevent division by 0 */ |
377 | |
378 | /* Create logger child: */ |
379 | logger_pid = fork_or_rexec(argv); |
380 | |
381 | if (logger_pid == 0) { /* child */ |
382 | char *tempdir; |
383 | |
384 | bb_signals(0 |
385 | + (1 << SIGUSR1) |
386 | + (1 << SIGUSR2) |
387 | + (1 << SIGTERM) |
388 | + (1 << SIGQUIT) |
389 | + (1 << SIGINT) |
390 | + (1 << SIGHUP) |
391 | , record_signo); |
392 | |
393 | if (DO_SIGNAL_SYNC) |
394 | /* Inform parent that we are ready */ |
395 | raise(SIGSTOP); |
396 | |
397 | /* If we are started by kernel, PATH might be unset. |
398 | * In order to find "tar", let's set some sane PATH: |
399 | */ |
400 | if (cmd == CMD_PID1 && !getenv("PATH")) |
401 | putenv((char*)bb_PATH_root_path); |
402 | |
403 | tempdir = make_tempdir(); |
404 | do_logging(sample_period_us); |
405 | finalize(tempdir, cmd == CMD_START ? argv[2] : NULL); |
406 | return EXIT_SUCCESS; |
407 | } |
408 | |
409 | /* parent */ |
410 | |
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. |
415 | */ |
416 | waitpid(logger_pid, NULL, WUNTRACED); |
417 | kill(logger_pid, SIGCONT); |
418 | } |
419 | |
420 | if (cmd == CMD_PID1) { |
421 | char *bootchart_init = getenv("bootchart_init"); |
422 | if (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"); |
427 | } |
428 | |
429 | if (cmd == CMD_START && argv[2]) { /* "start PROG ARGS" */ |
430 | pid_t pid = xvfork(); |
431 | if (pid == 0) { /* child */ |
432 | argv += 2; |
433 | execvp(argv[0], argv); |
434 | bb_perror_msg_and_die("can't execute '%s'", argv[0]); |
435 | } |
436 | /* parent */ |
437 | waitpid(pid, NULL, 0); |
438 | kill(logger_pid, SIGUSR1); |
439 | } |
440 | |
441 | return EXIT_SUCCESS; |
442 | } |