busybox/init/bootchartd.c

471 lines
14 KiB
C
Raw Normal View History

/* vi: set sw=4 ts=4: */
/*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config BOOTCHARTD
//config: bool "bootchartd (10 kb)"
//config: default y
//config: help
//config: bootchartd is commonly used to profile the boot process
//config: for the purpose of speeding it up. In this case, it is started
//config: by the kernel as the init process. This is configured by adding
//config: the init=/sbin/bootchartd option to the kernel command line.
//config:
//config: It can also be used to monitor the resource usage of a specific
//config: application or the running system in general. In this case,
//config: bootchartd is started interactively by running bootchartd start
//config: and stopped using bootchartd stop.
//config:
//config:config FEATURE_BOOTCHARTD_BLOATED_HEADER
//config: bool "Compatible, bloated header"
//config: default y
//config: depends on BOOTCHARTD
//config: help
//config: Create extended header file compatible with "big" bootchartd.
//config: "Big" bootchartd is a shell script and it dumps some
//config: "convenient" info into the header, such as:
//config: title = Boot chart for `hostname` (`date`)
//config: system.uname = `uname -srvm`
//config: system.release = `cat /etc/DISTRO-release`
//config: system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
//config: system.kernel.options = `cat /proc/cmdline`
//config: This data is not mandatory for bootchart graph generation,
//config: and is considered bloat. Nevertheless, this option
//config: makes bootchartd applet to dump a subset of it.
//config:
//config:config FEATURE_BOOTCHARTD_CONFIG_FILE
//config: bool "Support bootchartd.conf"
//config: default y
//config: depends on BOOTCHARTD
//config: help
//config: Enable reading and parsing of $PWD/bootchartd.conf
//config: and /etc/bootchartd.conf files.
//applet:IF_BOOTCHARTD(APPLET(bootchartd, BB_DIR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_BOOTCHARTD) += bootchartd.o
#include "libbb.h"
#include "common_bufsiz.h"
/* After libbb.h, since it needs sys/types.h on some systems */
#include <sys/utsname.h>
#ifdef __linux__
# include <sys/mount.h>
# ifndef MS_SILENT
# define MS_SILENT (1 << 15)
# endif
# ifndef MNT_DETACH
# define MNT_DETACH 0x00000002
# endif
#endif
#if !ENABLE_TAR && !ENABLE_WERROR
# warning Note: bootchartd requires tar command, but you did not select it.
#elif !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_WERROR
# warning Note: bootchartd requires tar -z support, but you did not select it.
#endif
#define BC_VERSION_STR "0.8"
/* For debugging, set to 0:
* strace won't work with DO_SIGNAL_SYNC set to 1.
*/
#define DO_SIGNAL_SYNC 1
//$PWD/bootchartd.conf and /etc/bootchartd.conf:
//supported options:
//# Sampling period (in seconds)
//SAMPLE_PERIOD=0.2
//
//not yet supported:
//# tmpfs size
//# (32 MB should suffice for ~20 minutes worth of log data, but YMMV)
//TMPFS_SIZE=32m
//
//# Whether to enable and store BSD process accounting information. The
//# kernel needs to be configured to enable v3 accounting
//# (CONFIG_BSD_PROCESS_ACCT_V3). accton from the GNU accounting utilities
//# is also required.
//PROCESS_ACCOUNTING="no"
//
//# Tarball for the various boot log files
//BOOTLOG_DEST=/var/log/bootchart.tgz
//
//# Whether to automatically stop logging as the boot process completes.
//# The logger will look for known processes that indicate bootup completion
//# at a specific runlevel (e.g. gdm-binary, mingetty, etc.).
//AUTO_STOP_LOGGER="yes"
//
//# Whether to automatically generate the boot chart once the boot logger
//# completes. The boot chart will be generated in $AUTO_RENDER_DIR.
//# Note that the bootchart package must be installed.
//AUTO_RENDER="no"
//
//# Image format to use for the auto-generated boot chart
//# (choose between png, svg and eps).
//AUTO_RENDER_FORMAT="png"
//
//# Output directory for auto-generated boot charts
//AUTO_RENDER_DIR="/var/log"
/* Globals */
struct globals {
char jiffy_line[COMMON_BUFSIZE];
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
static void dump_file(FILE *fp, const char *filename)
{
int fd = open(filename, O_RDONLY);
if (fd >= 0) {
fputs(G.jiffy_line, fp);
fflush(fp);
bb_copyfd_eof(fd, fileno(fp));
close(fd);
fputc('\n', fp);
}
}
static int dump_procs(FILE *fp, int look_for_login_process)
{
struct dirent *entry;
DIR *dir = opendir("/proc");
int found_login_process = 0;
fputs(G.jiffy_line, fp);
while ((entry = readdir(dir)) != NULL) {
char name[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
int stat_fd;
unsigned pid = bb_strtou(entry->d_name, NULL, 10);
if (errno)
continue;
/* Android's version reads /proc/PID/cmdline and extracts
* non-truncated process name. Do we want to do that? */
sprintf(name, "/proc/%u/stat", pid);
stat_fd = open(name, O_RDONLY);
if (stat_fd >= 0) {
char *p;
char stat_line[4*1024];
int rd = safe_read(stat_fd, stat_line, sizeof(stat_line)-2);
close(stat_fd);
if (rd < 0)
continue;
stat_line[rd] = '\0';
p = strchrnul(stat_line, '\n');
*p++ = '\n';
*p = '\0';
fputs(stat_line, fp);
if (!look_for_login_process)
continue;
p = strchr(stat_line, '(');
if (!p)
continue;
p++;
strchrnul(p, ')')[0] = '\0';
/* Is it gdm, kdm or a getty? */
if (((p[0] == 'g' || p[0] == 'k' || p[0] == 'x')
&& p[1] == 'd' && p[2] == 'm' && p[3] == '\0'
)
|| strstr(p, "getty")
) {
found_login_process = 1;
}
}
}
closedir(dir);
fputc('\n', fp);
return found_login_process;
}
static char *make_tempdir(void)
{
char template[] = "/tmp/bootchart.XXXXXX";
char *tempdir = xstrdup(mkdtemp(template));
if (!tempdir) {
#ifdef __linux__
/* /tmp is not writable (happens when we are used as init).
* Try to mount a tmpfs, then cd and lazily unmount it.
* Since we unmount it at once, we can mount it anywhere.
* Try a few locations which are likely ti exist.
*/
static const char dirs[] ALIGN1 = "/mnt\0""/tmp\0""/boot\0""/proc\0";
const char *try_dir = dirs;
while (mount("none", try_dir, "tmpfs", MS_SILENT, "size=16m") != 0) {
try_dir += strlen(try_dir) + 1;
if (!try_dir[0])
bb_perror_msg_and_die("can't %smount tmpfs", "");
}
//bb_error_msg("mounted tmpfs on %s", try_dir);
xchdir(try_dir);
if (umount2(try_dir, MNT_DETACH) != 0) {
bb_perror_msg_and_die("can't %smount tmpfs", "un");
}
#else
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg_and_die("can't create temporary directory");
#endif
} else {
xchdir(tempdir);
}
return tempdir;
}
static void do_logging(unsigned sample_period_us, int process_accounting)
{
FILE *proc_stat = xfopen("proc_stat.log", "w");
FILE *proc_diskstats = xfopen("proc_diskstats.log", "w");
//FILE *proc_netdev = xfopen("proc_netdev.log", "w");
FILE *proc_ps = xfopen("proc_ps.log", "w");
int look_for_login_process = (getppid() == 1);
unsigned count = 60*1000*1000 / sample_period_us; /* ~1 minute */
if (process_accounting) {
close(xopen("kernel_pacct", O_WRONLY | O_CREAT | O_TRUNC));
acct("kernel_pacct");
}
while (--count && !bb_got_signal) {
char *p;
int len = open_read_close("/proc/uptime", G.jiffy_line, sizeof(G.jiffy_line)-2);
if (len < 0)
goto wait_more;
/* /proc/uptime has format "NNNNNN.MM NNNNNNN.MM" */
/* we convert it to "NNNNNNMM\n" (using first value) */
G.jiffy_line[len] = '\0';
p = strchr(G.jiffy_line, '.');
if (!p)
goto wait_more;
while (isdigit(*++p))
p[-1] = *p;
p[-1] = '\n';
p[0] = '\0';
dump_file(proc_stat, "/proc/stat");
dump_file(proc_diskstats, "/proc/diskstats");
//dump_file(proc_netdev, "/proc/net/dev");
if (dump_procs(proc_ps, look_for_login_process)) {
/* dump_procs saw a getty or {g,k,x}dm
* stop logging in 2 seconds:
*/
if (count > 2*1000*1000 / sample_period_us)
count = 2*1000*1000 / sample_period_us;
}
fflush_all();
wait_more:
usleep(sample_period_us);
}
}
static void finalize(char *tempdir, const char *prog, int process_accounting)
{
//# Stop process accounting if configured
//local pacct=
//[ -e kernel_pacct ] && pacct=kernel_pacct
FILE *header_fp = xfopen("header", "w");
if (process_accounting)
acct(NULL);
if (prog)
fprintf(header_fp, "profile.process = %s\n", prog);
fputs("version = "BC_VERSION_STR"\n", header_fp);
if (ENABLE_FEATURE_BOOTCHARTD_BLOATED_HEADER) {
char *hostname;
char *kcmdline;
time_t t;
struct tm tm_time;
/* x2 for possible localized weekday/month names */
char date_buf[sizeof("Mon Jun 21 05:29:03 CEST 2010") * 2];
struct utsname unamebuf;
hostname = safe_gethostname();
time(&t);
localtime_r(&t, &tm_time);
strftime(date_buf, sizeof(date_buf), "%a %b %e %H:%M:%S %Z %Y", &tm_time);
fprintf(header_fp, "title = Boot chart for %s (%s)\n", hostname, date_buf);
if (ENABLE_FEATURE_CLEAN_UP)
free(hostname);
uname(&unamebuf); /* never fails */
/* same as uname -srvm */
fprintf(header_fp, "system.uname = %s %s %s %s\n",
unamebuf.sysname,
unamebuf.release,
unamebuf.version,
unamebuf.machine
);
//system.release = `cat /etc/DISTRO-release`
//system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
kcmdline = xmalloc_open_read_close("/proc/cmdline", NULL);
/* kcmdline includes trailing "\n" */
fprintf(header_fp, "system.kernel.options = %s", kcmdline);
if (ENABLE_FEATURE_CLEAN_UP)
free(kcmdline);
}
fclose(header_fp);
/* Package log files */
system(xasprintf("tar -zcf /var/log/bootlog.tgz header %s *.log", process_accounting ? "kernel_pacct" : ""));
/* Clean up (if we are not in detached tmpfs) */
if (tempdir) {
unlink("header");
unlink("proc_stat.log");
unlink("proc_diskstats.log");
//unlink("proc_netdev.log");
unlink("proc_ps.log");
if (process_accounting)
unlink("kernel_pacct");
rmdir(tempdir);
}
/* shell-based bootchartd tries to run /usr/bin/bootchart if $AUTO_RENDER=yes:
* /usr/bin/bootchart -o "$AUTO_RENDER_DIR" -f $AUTO_RENDER_FORMAT "$BOOTLOG_DEST"
*/
}
//usage:#define bootchartd_trivial_usage
//usage: "start [PROG ARGS]|stop|init"
//usage:#define bootchartd_full_usage "\n\n"
//usage: "Create /var/log/bootchart.tgz with boot chart data\n"
//usage: "\nstart: start background logging; with PROG, run PROG, then kill logging with USR1"
//usage: "\nstop: send USR1 to all bootchartd processes"
//usage: "\ninit: start background logging; stop when getty/xdm is seen (for init scripts)"
//usage: "\nUnder PID 1: as init, then exec $bootchart_init, /init, /sbin/init"
int bootchartd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bootchartd_main(int argc UNUSED_PARAM, char **argv)
{
unsigned sample_period_us;
pid_t parent_pid, logger_pid;
smallint cmd;
int process_accounting;
enum {
CMD_STOP = 0,
CMD_START,
CMD_INIT,
CMD_PID1, /* used to mark pid 1 case */
};
INIT_G();
parent_pid = getpid();
if (argv[1]) {
cmd = index_in_strings("stop\0""start\0""init\0", argv[1]);
if (cmd < 0)
bb_show_usage();
if (cmd == CMD_STOP) {
pid_t *pidList = find_pid_by_name("bootchartd");
while (*pidList != 0) {
if (*pidList != parent_pid)
kill(*pidList, SIGUSR1);
pidList++;
}
return EXIT_SUCCESS;
}
} else {
if (parent_pid != 1)
bb_show_usage();
cmd = CMD_PID1;
}
/* Here we are in START, INIT or CMD_PID1 state */
/* Read config file: */
sample_period_us = 200 * 1000;
process_accounting = 0;
if (ENABLE_FEATURE_BOOTCHARTD_CONFIG_FILE) {
char* token[2];
parser_t *parser = config_open2("/etc/bootchartd.conf" + 5, fopen_for_read);
if (!parser)
parser = config_open2("/etc/bootchartd.conf", fopen_for_read);
while (config_read(parser, token, 2, 0, "#=", PARSE_NORMAL & ~PARSE_COLLAPSE)) {
if (strcmp(token[0], "SAMPLE_PERIOD") == 0 && token[1])
sample_period_us = atof(token[1]) * 1000000;
if (strcmp(token[0], "PROCESS_ACCOUNTING") == 0 && token[1]
&& (strcmp(token[1], "on") == 0 || strcmp(token[1], "yes") == 0)
) {
process_accounting = 1;
}
}
config_close(parser);
if ((int)sample_period_us <= 0)
sample_period_us = 1; /* prevent division by 0 */
}
/* Create logger child: */
logger_pid = fork_or_rexec(argv);
if (logger_pid == 0) { /* child */
char *tempdir;
bb_signals(0
+ (1 << SIGUSR1)
+ (1 << SIGUSR2)
+ (1 << SIGTERM)
+ (1 << SIGQUIT)
+ (1 << SIGINT)
+ (1 << SIGHUP)
, record_signo);
if (DO_SIGNAL_SYNC)
/* Inform parent that we are ready */
raise(SIGSTOP);
/* If we are started by kernel, PATH might be unset.
* In order to find "tar", let's set some sane PATH:
*/
if (cmd == CMD_PID1 && !getenv("PATH"))
putenv((char*)bb_PATH_root_path);
tempdir = make_tempdir();
do_logging(sample_period_us, process_accounting);
finalize(tempdir, cmd == CMD_START ? argv[2] : NULL, process_accounting);
return EXIT_SUCCESS;
}
/* parent */
USE_FOR_NOMMU(argv[0][0] &= 0x7f); /* undo fork_or_rexec() damage */
if (DO_SIGNAL_SYNC) {
/* Wait for logger child to set handlers, then unpause it.
* Otherwise with short-lived PROG (e.g. "bootchartd start true")
* we might send SIGUSR1 before logger sets its handler.
*/
waitpid(logger_pid, NULL, WUNTRACED);
kill(logger_pid, SIGCONT);
}
if (cmd == CMD_PID1) {
char *bootchart_init = getenv("bootchart_init");
if (bootchart_init)
execl(bootchart_init, bootchart_init, NULL);
execl("/init", "init", NULL);
execl("/sbin/init", "init", NULL);
bb_perror_msg_and_die("can't execute '%s'", "/sbin/init");
}
if (cmd == CMD_START && argv[2]) { /* "start PROG ARGS" */
pid_t pid = xvfork();
if (pid == 0) { /* child */
argv += 2;
BB_EXECVP_or_die(argv);
}
/* parent */
waitpid(pid, NULL, 0);
kill(logger_pid, SIGUSR1);
}
return EXIT_SUCCESS;
}