[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 4 | */
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| 5 |
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[3232] | 6 | //applet:IF_BOOTCHARTD(APPLET(bootchartd, BB_DIR_SBIN, BB_SUID_DROP))
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[2725] | 7 |
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| 8 | //kbuild:lib-$(CONFIG_BOOTCHARTD) += bootchartd.o
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| 9 |
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| 10 | //config:config BOOTCHARTD
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| 11 | //config: bool "bootchartd"
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| 12 | //config: default y
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| 13 | //config: help
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| 14 | //config: bootchartd is commonly used to profile the boot process
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| 15 | //config: for the purpose of speeding it up. In this case, it is started
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| 16 | //config: by the kernel as the init process. This is configured by adding
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| 17 | //config: the init=/sbin/bootchartd option to the kernel command line.
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| 18 | //config:
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| 19 | //config: It can also be used to monitor the resource usage of a specific
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| 20 | //config: application or the running system in general. In this case,
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| 21 | //config: bootchartd is started interactively by running bootchartd start
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| 22 | //config: and stopped using bootchartd stop.
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| 23 | //config:
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| 24 | //config:config FEATURE_BOOTCHARTD_BLOATED_HEADER
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| 25 | //config: bool "Compatible, bloated header"
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| 26 | //config: default y
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| 27 | //config: depends on BOOTCHARTD
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| 28 | //config: help
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| 29 | //config: Create extended header file compatible with "big" bootchartd.
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| 30 | //config: "Big" bootchartd is a shell script and it dumps some
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| 31 | //config: "convenient" info int the header, such as:
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| 32 | //config: title = Boot chart for `hostname` (`date`)
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| 33 | //config: system.uname = `uname -srvm`
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| 34 | //config: system.release = `cat /etc/DISTRO-release`
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| 35 | //config: system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
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| 36 | //config: system.kernel.options = `cat /proc/cmdline`
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| 37 | //config: This data is not mandatory for bootchart graph generation,
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| 38 | //config: and is considered bloat. Nevertheless, this option
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| 39 | //config: makes bootchartd applet to dump a subset of it.
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| 40 | //config:
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| 41 | //config:config FEATURE_BOOTCHARTD_CONFIG_FILE
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| 42 | //config: bool "Support bootchartd.conf"
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| 43 | //config: default y
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| 44 | //config: depends on BOOTCHARTD
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| 45 | //config: help
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| 46 | //config: Enable reading and parsing of $PWD/bootchartd.conf
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| 47 | //config: and /etc/bootchartd.conf files.
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| 48 |
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| 49 | #include "libbb.h"
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[3621] | 50 | #include "common_bufsiz.h"
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[2725] | 51 | /* After libbb.h, since it needs sys/types.h on some systems */
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| 52 | #include <sys/utsname.h>
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| 53 |
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| 54 | #ifdef __linux__
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| 55 | # include <sys/mount.h>
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| 56 | # ifndef MS_SILENT
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| 57 | # define MS_SILENT (1 << 15)
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| 58 | # endif
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| 59 | # ifndef MNT_DETACH
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| 60 | # define MNT_DETACH 0x00000002
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| 61 | # endif
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| 62 | #endif
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| 63 |
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[3621] | 64 | #if !ENABLE_TAR && !ENABLE_WERROR
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| 65 | # warning Note: bootchartd requires tar command, but you did not select it.
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| 66 | #elif !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_WERROR
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| 67 | # warning Note: bootchartd requires tar -z support, but you did not select it.
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| 68 | #endif
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| 69 |
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[2725] | 70 | #define BC_VERSION_STR "0.8"
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| 71 |
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| 72 | /* For debugging, set to 0:
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| 73 | * strace won't work with DO_SIGNAL_SYNC set to 1.
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| 74 | */
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| 75 | #define DO_SIGNAL_SYNC 1
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| 76 |
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| 77 |
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| 78 | //$PWD/bootchartd.conf and /etc/bootchartd.conf:
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| 79 | //supported options:
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| 80 | //# Sampling period (in seconds)
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| 81 | //SAMPLE_PERIOD=0.2
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| 82 | //
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| 83 | //not yet supported:
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| 84 | //# tmpfs size
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| 85 | //# (32 MB should suffice for ~20 minutes worth of log data, but YMMV)
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| 86 | //TMPFS_SIZE=32m
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| 87 | //
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| 88 | //# Whether to enable and store BSD process accounting information. The
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| 89 | //# kernel needs to be configured to enable v3 accounting
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| 90 | //# (CONFIG_BSD_PROCESS_ACCT_V3). accton from the GNU accounting utilities
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| 91 | //# is also required.
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| 92 | //PROCESS_ACCOUNTING="no"
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| 93 | //
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| 94 | //# Tarball for the various boot log files
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| 95 | //BOOTLOG_DEST=/var/log/bootchart.tgz
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| 96 | //
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| 97 | //# Whether to automatically stop logging as the boot process completes.
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| 98 | //# The logger will look for known processes that indicate bootup completion
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| 99 | //# at a specific runlevel (e.g. gdm-binary, mingetty, etc.).
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| 100 | //AUTO_STOP_LOGGER="yes"
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| 101 | //
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| 102 | //# Whether to automatically generate the boot chart once the boot logger
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| 103 | //# completes. The boot chart will be generated in $AUTO_RENDER_DIR.
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| 104 | //# Note that the bootchart package must be installed.
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| 105 | //AUTO_RENDER="no"
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| 106 | //
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| 107 | //# Image format to use for the auto-generated boot chart
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| 108 | //# (choose between png, svg and eps).
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| 109 | //AUTO_RENDER_FORMAT="png"
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| 110 | //
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| 111 | //# Output directory for auto-generated boot charts
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| 112 | //AUTO_RENDER_DIR="/var/log"
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| 113 |
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| 114 |
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| 115 | /* Globals */
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| 116 | struct globals {
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| 117 | char jiffy_line[COMMON_BUFSIZE];
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| 118 | } FIX_ALIASING;
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[3621] | 119 | #define G (*(struct globals*)bb_common_bufsiz1)
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| 120 | #define INIT_G() do { setup_common_bufsiz(); } while (0)
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[2725] | 121 |
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| 122 | static void dump_file(FILE *fp, const char *filename)
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| 123 | {
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| 124 | int fd = open(filename, O_RDONLY);
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| 125 | if (fd >= 0) {
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| 126 | fputs(G.jiffy_line, fp);
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| 127 | fflush(fp);
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| 128 | bb_copyfd_eof(fd, fileno(fp));
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| 129 | close(fd);
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| 130 | fputc('\n', fp);
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| 131 | }
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| 132 | }
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| 133 |
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| 134 | static int dump_procs(FILE *fp, int look_for_login_process)
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| 135 | {
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| 136 | struct dirent *entry;
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| 137 | DIR *dir = opendir("/proc");
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| 138 | int found_login_process = 0;
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| 139 |
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| 140 | fputs(G.jiffy_line, fp);
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| 141 | while ((entry = readdir(dir)) != NULL) {
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| 142 | char name[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
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| 143 | int stat_fd;
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| 144 | unsigned pid = bb_strtou(entry->d_name, NULL, 10);
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| 145 | if (errno)
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| 146 | continue;
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| 147 |
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| 148 | /* Android's version reads /proc/PID/cmdline and extracts
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| 149 | * non-truncated process name. Do we want to do that? */
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| 150 |
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| 151 | sprintf(name, "/proc/%u/stat", pid);
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| 152 | stat_fd = open(name, O_RDONLY);
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| 153 | if (stat_fd >= 0) {
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| 154 | char *p;
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| 155 | char stat_line[4*1024];
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| 156 | int rd = safe_read(stat_fd, stat_line, sizeof(stat_line)-2);
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| 157 |
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| 158 | close(stat_fd);
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| 159 | if (rd < 0)
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| 160 | continue;
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| 161 | stat_line[rd] = '\0';
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| 162 | p = strchrnul(stat_line, '\n');
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| 163 | *p++ = '\n';
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| 164 | *p = '\0';
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| 165 | fputs(stat_line, fp);
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| 166 | if (!look_for_login_process)
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| 167 | continue;
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| 168 | p = strchr(stat_line, '(');
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| 169 | if (!p)
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| 170 | continue;
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| 171 | p++;
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| 172 | strchrnul(p, ')')[0] = '\0';
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| 173 | /* Is it gdm, kdm or a getty? */
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| 174 | if (((p[0] == 'g' || p[0] == 'k' || p[0] == 'x') && p[1] == 'd' && p[2] == 'm')
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| 175 | || strstr(p, "getty")
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| 176 | ) {
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| 177 | found_login_process = 1;
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| 178 | }
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| 179 | }
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| 180 | }
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| 181 | closedir(dir);
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| 182 | fputc('\n', fp);
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| 183 | return found_login_process;
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| 184 | }
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| 185 |
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| 186 | static char *make_tempdir(void)
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| 187 | {
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| 188 | char template[] = "/tmp/bootchart.XXXXXX";
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| 189 | char *tempdir = xstrdup(mkdtemp(template));
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| 190 | if (!tempdir) {
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| 191 | #ifdef __linux__
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| 192 | /* /tmp is not writable (happens when we are used as init).
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| 193 | * Try to mount a tmpfs, them cd and lazily unmount it.
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| 194 | * Since we unmount it at once, we can mount it anywhere.
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| 195 | * Try a few locations which are likely ti exist.
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| 196 | */
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[3621] | 197 | static const char dirs[] ALIGN1 = "/mnt\0""/tmp\0""/boot\0""/proc\0";
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[2725] | 198 | const char *try_dir = dirs;
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| 199 | while (mount("none", try_dir, "tmpfs", MS_SILENT, "size=16m") != 0) {
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| 200 | try_dir += strlen(try_dir) + 1;
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| 201 | if (!try_dir[0])
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| 202 | bb_perror_msg_and_die("can't %smount tmpfs", "");
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| 203 | }
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| 204 | //bb_error_msg("mounted tmpfs on %s", try_dir);
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| 205 | xchdir(try_dir);
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| 206 | if (umount2(try_dir, MNT_DETACH) != 0) {
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| 207 | bb_perror_msg_and_die("can't %smount tmpfs", "un");
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| 208 | }
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| 209 | #else
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| 210 | bb_perror_msg_and_die("can't create temporary directory");
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| 211 | #endif
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| 212 | } else {
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| 213 | xchdir(tempdir);
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| 214 | }
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| 215 | return tempdir;
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| 216 | }
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| 217 |
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[3232] | 218 | static void do_logging(unsigned sample_period_us, int process_accounting)
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[2725] | 219 | {
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| 220 | FILE *proc_stat = xfopen("proc_stat.log", "w");
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| 221 | FILE *proc_diskstats = xfopen("proc_diskstats.log", "w");
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| 222 | //FILE *proc_netdev = xfopen("proc_netdev.log", "w");
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| 223 | FILE *proc_ps = xfopen("proc_ps.log", "w");
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| 224 | int look_for_login_process = (getppid() == 1);
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| 225 | unsigned count = 60*1000*1000 / sample_period_us; /* ~1 minute */
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| 226 |
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[3232] | 227 | if (process_accounting) {
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| 228 | close(xopen("kernel_pacct", O_WRONLY | O_CREAT | O_TRUNC));
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| 229 | acct("kernel_pacct");
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| 230 | }
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| 231 |
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[2725] | 232 | while (--count && !bb_got_signal) {
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| 233 | char *p;
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| 234 | int len = open_read_close("/proc/uptime", G.jiffy_line, sizeof(G.jiffy_line)-2);
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| 235 | if (len < 0)
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| 236 | goto wait_more;
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| 237 | /* /proc/uptime has format "NNNNNN.MM NNNNNNN.MM" */
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| 238 | /* we convert it to "NNNNNNMM\n" (using first value) */
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| 239 | G.jiffy_line[len] = '\0';
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| 240 | p = strchr(G.jiffy_line, '.');
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| 241 | if (!p)
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| 242 | goto wait_more;
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| 243 | while (isdigit(*++p))
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| 244 | p[-1] = *p;
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| 245 | p[-1] = '\n';
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| 246 | p[0] = '\0';
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| 247 |
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| 248 | dump_file(proc_stat, "/proc/stat");
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| 249 | dump_file(proc_diskstats, "/proc/diskstats");
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| 250 | //dump_file(proc_netdev, "/proc/net/dev");
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| 251 | if (dump_procs(proc_ps, look_for_login_process)) {
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| 252 | /* dump_procs saw a getty or {g,k,x}dm
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| 253 | * stop logging in 2 seconds:
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| 254 | */
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| 255 | if (count > 2*1000*1000 / sample_period_us)
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| 256 | count = 2*1000*1000 / sample_period_us;
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| 257 | }
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| 258 | fflush_all();
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| 259 | wait_more:
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| 260 | usleep(sample_period_us);
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| 261 | }
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| 262 | }
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| 263 |
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[3232] | 264 | static void finalize(char *tempdir, const char *prog, int process_accounting)
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[2725] | 265 | {
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| 266 | //# Stop process accounting if configured
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| 267 | //local pacct=
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| 268 | //[ -e kernel_pacct ] && pacct=kernel_pacct
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| 269 |
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| 270 | FILE *header_fp = xfopen("header", "w");
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| 271 |
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[3232] | 272 | if (process_accounting)
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| 273 | acct(NULL);
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| 274 |
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[2725] | 275 | if (prog)
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| 276 | fprintf(header_fp, "profile.process = %s\n", prog);
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| 277 |
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| 278 | fputs("version = "BC_VERSION_STR"\n", header_fp);
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| 279 | if (ENABLE_FEATURE_BOOTCHARTD_BLOATED_HEADER) {
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| 280 | char *hostname;
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| 281 | char *kcmdline;
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| 282 | time_t t;
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| 283 | struct tm tm_time;
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| 284 | /* x2 for possible localized weekday/month names */
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| 285 | char date_buf[sizeof("Mon Jun 21 05:29:03 CEST 2010") * 2];
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| 286 | struct utsname unamebuf;
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| 287 |
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| 288 | hostname = safe_gethostname();
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| 289 | time(&t);
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| 290 | localtime_r(&t, &tm_time);
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| 291 | strftime(date_buf, sizeof(date_buf), "%a %b %e %H:%M:%S %Z %Y", &tm_time);
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| 292 | fprintf(header_fp, "title = Boot chart for %s (%s)\n", hostname, date_buf);
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| 293 | if (ENABLE_FEATURE_CLEAN_UP)
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| 294 | free(hostname);
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| 295 |
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| 296 | uname(&unamebuf); /* never fails */
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| 297 | /* same as uname -srvm */
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| 298 | fprintf(header_fp, "system.uname = %s %s %s %s\n",
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| 299 | unamebuf.sysname,
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| 300 | unamebuf.release,
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| 301 | unamebuf.version,
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| 302 | unamebuf.machine
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| 303 | );
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| 304 |
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| 305 | //system.release = `cat /etc/DISTRO-release`
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| 306 | //system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
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| 307 |
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| 308 | kcmdline = xmalloc_open_read_close("/proc/cmdline", NULL);
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| 309 | /* kcmdline includes trailing "\n" */
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| 310 | fprintf(header_fp, "system.kernel.options = %s", kcmdline);
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| 311 | if (ENABLE_FEATURE_CLEAN_UP)
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| 312 | free(kcmdline);
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| 313 | }
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| 314 | fclose(header_fp);
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| 315 |
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| 316 | /* Package log files */
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[3232] | 317 | system(xasprintf("tar -zcf /var/log/bootlog.tgz header %s *.log", process_accounting ? "kernel_pacct" : ""));
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[2725] | 318 | /* Clean up (if we are not in detached tmpfs) */
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| 319 | if (tempdir) {
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| 320 | unlink("header");
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| 321 | unlink("proc_stat.log");
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| 322 | unlink("proc_diskstats.log");
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| 323 | //unlink("proc_netdev.log");
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| 324 | unlink("proc_ps.log");
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[3232] | 325 | if (process_accounting)
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| 326 | unlink("kernel_pacct");
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[2725] | 327 | rmdir(tempdir);
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| 328 | }
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| 329 |
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| 330 | /* shell-based bootchartd tries to run /usr/bin/bootchart if $AUTO_RENDER=yes:
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| 331 | * /usr/bin/bootchart -o "$AUTO_RENDER_DIR" -f $AUTO_RENDER_FORMAT "$BOOTLOG_DEST"
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| 332 | */
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| 333 | }
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| 334 |
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| 335 | //usage:#define bootchartd_trivial_usage
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| 336 | //usage: "start [PROG ARGS]|stop|init"
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| 337 | //usage:#define bootchartd_full_usage "\n\n"
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| 338 | //usage: "Create /var/log/bootchart.tgz with boot chart data\n"
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| 339 | //usage: "\nstart: start background logging; with PROG, run PROG, then kill logging with USR1"
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| 340 | //usage: "\nstop: send USR1 to all bootchartd processes"
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| 341 | //usage: "\ninit: start background logging; stop when getty/xdm is seen (for init scripts)"
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| 342 | //usage: "\nUnder PID 1: as init, then exec $bootchart_init, /init, /sbin/init"
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| 343 |
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| 344 | int bootchartd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 345 | int bootchartd_main(int argc UNUSED_PARAM, char **argv)
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| 346 | {
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| 347 | unsigned sample_period_us;
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| 348 | pid_t parent_pid, logger_pid;
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| 349 | smallint cmd;
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[3232] | 350 | int process_accounting;
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[2725] | 351 | enum {
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| 352 | CMD_STOP = 0,
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| 353 | CMD_START,
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| 354 | CMD_INIT,
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| 355 | CMD_PID1, /* used to mark pid 1 case */
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| 356 | };
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| 357 |
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| 358 | INIT_G();
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| 359 |
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| 360 | parent_pid = getpid();
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| 361 | if (argv[1]) {
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| 362 | cmd = index_in_strings("stop\0""start\0""init\0", argv[1]);
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| 363 | if (cmd < 0)
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| 364 | bb_show_usage();
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| 365 | if (cmd == CMD_STOP) {
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| 366 | pid_t *pidList = find_pid_by_name("bootchartd");
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| 367 | while (*pidList != 0) {
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| 368 | if (*pidList != parent_pid)
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| 369 | kill(*pidList, SIGUSR1);
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| 370 | pidList++;
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| 371 | }
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| 372 | return EXIT_SUCCESS;
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| 373 | }
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| 374 | } else {
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| 375 | if (parent_pid != 1)
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| 376 | bb_show_usage();
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| 377 | cmd = CMD_PID1;
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| 378 | }
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| 379 |
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| 380 | /* Here we are in START, INIT or CMD_PID1 state */
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| 381 |
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| 382 | /* Read config file: */
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| 383 | sample_period_us = 200 * 1000;
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[3232] | 384 | process_accounting = 0;
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[2725] | 385 | if (ENABLE_FEATURE_BOOTCHARTD_CONFIG_FILE) {
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| 386 | char* token[2];
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| 387 | parser_t *parser = config_open2("/etc/bootchartd.conf" + 5, fopen_for_read);
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| 388 | if (!parser)
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| 389 | parser = config_open2("/etc/bootchartd.conf", fopen_for_read);
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| 390 | while (config_read(parser, token, 2, 0, "#=", PARSE_NORMAL & ~PARSE_COLLAPSE)) {
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| 391 | if (strcmp(token[0], "SAMPLE_PERIOD") == 0 && token[1])
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| 392 | sample_period_us = atof(token[1]) * 1000000;
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[3232] | 393 | if (strcmp(token[0], "PROCESS_ACCOUNTING") == 0 && token[1]
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| 394 | && (strcmp(token[1], "on") == 0 || strcmp(token[1], "yes") == 0)
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| 395 | ) {
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| 396 | process_accounting = 1;
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| 397 | }
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[2725] | 398 | }
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| 399 | config_close(parser);
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[3232] | 400 | if ((int)sample_period_us <= 0)
|
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| 401 | sample_period_us = 1; /* prevent division by 0 */
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[2725] | 402 | }
|
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| 403 |
|
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| 404 | /* Create logger child: */
|
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| 405 | logger_pid = fork_or_rexec(argv);
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| 406 |
|
---|
| 407 | if (logger_pid == 0) { /* child */
|
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| 408 | char *tempdir;
|
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| 409 |
|
---|
| 410 | bb_signals(0
|
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| 411 | + (1 << SIGUSR1)
|
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| 412 | + (1 << SIGUSR2)
|
---|
| 413 | + (1 << SIGTERM)
|
---|
| 414 | + (1 << SIGQUIT)
|
---|
| 415 | + (1 << SIGINT)
|
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| 416 | + (1 << SIGHUP)
|
---|
| 417 | , record_signo);
|
---|
| 418 |
|
---|
| 419 | if (DO_SIGNAL_SYNC)
|
---|
| 420 | /* Inform parent that we are ready */
|
---|
| 421 | raise(SIGSTOP);
|
---|
| 422 |
|
---|
| 423 | /* If we are started by kernel, PATH might be unset.
|
---|
| 424 | * In order to find "tar", let's set some sane PATH:
|
---|
| 425 | */
|
---|
| 426 | if (cmd == CMD_PID1 && !getenv("PATH"))
|
---|
| 427 | putenv((char*)bb_PATH_root_path);
|
---|
| 428 |
|
---|
| 429 | tempdir = make_tempdir();
|
---|
[3232] | 430 | do_logging(sample_period_us, process_accounting);
|
---|
| 431 | finalize(tempdir, cmd == CMD_START ? argv[2] : NULL, process_accounting);
|
---|
[2725] | 432 | return EXIT_SUCCESS;
|
---|
| 433 | }
|
---|
| 434 |
|
---|
| 435 | /* parent */
|
---|
| 436 |
|
---|
[3232] | 437 | USE_FOR_NOMMU(argv[0][0] &= 0x7f); /* undo fork_or_rexec() damage */
|
---|
| 438 |
|
---|
[2725] | 439 | if (DO_SIGNAL_SYNC) {
|
---|
| 440 | /* Wait for logger child to set handlers, then unpause it.
|
---|
| 441 | * Otherwise with short-lived PROG (e.g. "bootchartd start true")
|
---|
| 442 | * we might send SIGUSR1 before logger sets its handler.
|
---|
| 443 | */
|
---|
| 444 | waitpid(logger_pid, NULL, WUNTRACED);
|
---|
| 445 | kill(logger_pid, SIGCONT);
|
---|
| 446 | }
|
---|
| 447 |
|
---|
| 448 | if (cmd == CMD_PID1) {
|
---|
| 449 | char *bootchart_init = getenv("bootchart_init");
|
---|
| 450 | if (bootchart_init)
|
---|
| 451 | execl(bootchart_init, bootchart_init, NULL);
|
---|
| 452 | execl("/init", "init", NULL);
|
---|
| 453 | execl("/sbin/init", "init", NULL);
|
---|
| 454 | bb_perror_msg_and_die("can't execute '%s'", "/sbin/init");
|
---|
| 455 | }
|
---|
| 456 |
|
---|
| 457 | if (cmd == CMD_START && argv[2]) { /* "start PROG ARGS" */
|
---|
| 458 | pid_t pid = xvfork();
|
---|
| 459 | if (pid == 0) { /* child */
|
---|
| 460 | argv += 2;
|
---|
[3232] | 461 | BB_EXECVP_or_die(argv);
|
---|
[2725] | 462 | }
|
---|
| 463 | /* parent */
|
---|
| 464 | waitpid(pid, NULL, 0);
|
---|
| 465 | kill(logger_pid, SIGUSR1);
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | return EXIT_SUCCESS;
|
---|
| 469 | }
|
---|