bootchartd: new applet

Usage: bootchartd start [PROG ARGS]|init|stop

Create /var/log/bootchart.tgz with boot chart data

Options:
start: start background logging; with PROG, run PROG, then kill
logging with USR1
stop: send USR1 to all bootchartd processes
init: start background logging; stop when getty/gdm is seen (for init scripts)
Under PID 1: as init, then exec $bootchart_init, /init, /sbin/init

function                                             old     new   delta
bootchartd_main                                        -     907    +907
dump_procs                                             -     353    +353
packed_usage                                       26566   26735    +169
dump_file                                              -      91     +91
static.dirs                                            -      23     +23
applet_names                                        2176    2187     +11
applet_main                                         1284    1288      +4
applet_nameofs                                       642     644      +2
------------------------------------------------------------------------------
(add/remove: 5/0 grow/shrink: 4/0 up/down: 1560/0)           Total: 1560 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 373 insertions, 3 deletions

diff --git a/init/Config.in b/init/Config.in
index 3d99d47..76d5092 100644
--- a/init/Config.in
+++ b/init/Config.in
@@ -120,4 +120,18 @@ config MESG
 	  Mesg controls access to your terminal by others. It is typically
 	  used to allow or disallow other users to write to your terminal
 
+config BOOTCHARTD
+	bool "bootchartd"
+	default n
+	help
+	  bootchartd is commonly used to profile the boot process
+	  for the purpose of speeding it up. In this case, it is started
+	  by the kernel as the init process. This is configured by adding
+	  the init=/sbin/bootchartd option to the kernel command line.
+
+	  It can also be used to monitor the resource usage of a specific
+	  application or the running system in general. In this case,
+	  bootchartd is started interactively by running bootchartd start
+	  and stopped using bootchartd stop.
+
 endmenu
diff --git a/init/Kbuild b/init/Kbuild
index c060f3a..ce3f302 100644
--- a/init/Kbuild
+++ b/init/Kbuild
@@ -5,6 +5,7 @@
 # Licensed under the GPL v2, see the file LICENSE in this tarball.
 
 lib-y:=
-lib-$(CONFIG_HALT)	+= halt.o
-lib-$(CONFIG_INIT)	+= init.o
-lib-$(CONFIG_MESG)	+= mesg.o
+lib-$(CONFIG_HALT)       += halt.o
+lib-$(CONFIG_INIT)       += init.o
+lib-$(CONFIG_MESG)       += mesg.o
+lib-$(CONFIG_BOOTCHARTD) += bootchartd.o
diff --git a/init/bootchartd.c b/init/bootchartd.c
new file mode 100644
index 0000000..fccaace
--- /dev/null
+++ b/init/bootchartd.c
@@ -0,0 +1,355 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+#include "libbb.h"
+#include <sys/mount.h>
+#ifndef MS_SILENT
+# define MS_SILENT      (1 << 15)
+#endif
+#ifndef MNT_DETACH
+# define MNT_DETACH 0x00000002
+#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
+
+
+//Not supported: $PWD/bootchartd.conf and /etc/bootchartd.conf
+
+//# tmpfs size
+//# (32 MB should suffice for ~20 minutes worth of log data, but YMMV)
+//TMPFS_SIZE=32m
+//
+//# Sampling period (in seconds)
+//SAMPLE_PERIOD=0.2
+//
+//# 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[sizeof(bb_common_bufsiz1)];
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { } 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';
+			/* If is gdm, kdm or a getty? */
+			if (((p[0] == 'g' || p[0] == 'k' || p[0] == 'x') && p[1] == 'd' && p[2] == 'm')
+			 || strstr(p, "getty")
+			) {
+				found_login_process = 1;
+			}
+		}
+	}
+	closedir(dir);
+	fputc('\n', fp);
+	return found_login_process;
+}
+
+static char *make_tempdir(const char *prog)
+{
+	char template[] = "/tmp/bootchart.XXXXXX";
+	char *tempdir = xstrdup(mkdtemp(template));
+	if (!tempdir) {
+		/* /tmp is not writable (happens when we are used as init).
+		 * Try to mount a tmpfs, them 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[] = "/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 {
+		xchdir(tempdir);
+	}
+	{
+		FILE *header_fp = xfopen("header", "w");
+		if (prog)
+			fprintf(header_fp, "profile.process = %s\n", prog);
+		fputs("version = "BC_VERSION_STR"\n", header_fp);
+		fclose(header_fp);
+	}
+
+	return tempdir;
+}
+
+static void do_logging(void)
+{
+	//# Enable process accounting if configured
+	//if [ "$PROCESS_ACCOUNTING" = "yes" ]; then
+	//	[ -e kernel_pacct ] || : > kernel_pacct
+	//	accton kernel_pacct
+	//fi
+
+	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 / 200*1000; /* ~1 minute */
+
+	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 / 200*1000)
+				count = 2*1000*1000 / 200*1000;
+		}
+		fflush_all();
+ wait_more:
+		usleep(200*1000);
+	}
+
+	// [ -e kernel_pacct ] && accton off
+}
+
+static void finalize(char *tempdir)
+{
+	//# Stop process accounting if configured
+	//local pacct=
+	//[ -e kernel_pacct ] && pacct=kernel_pacct
+
+	//(
+	//	echo "version = $VERSION"
+	//	echo "title = Boot chart for $( hostname | sed q ) ($( date ))"
+	//	echo "system.uname = $( uname -srvm | sed q )"
+	//	echo "system.release = $( sed q /etc/SuSE-release )"
+	//	echo "system.cpu = $( grep '^model name' /proc/cpuinfo | sed q ) ($cpucount)"
+	//	echo "system.kernel.options = $( sed q /proc/cmdline )"
+	//) >> header
+
+	/* Package log files */
+	system("tar -zcf /var/log/bootchart.tgz header *.log"); // + $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");
+		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:
+ * bootchartd start [PROG ARGS]: start logging in background, USR1 stops it.
+ *	With PROG, runs PROG, then kills background logging.
+ * bootchartd stop: same as "killall -USR1 bootchartd"
+ * bootchartd init: start logging in background
+ *	Stop when getty/gdm is seen (if AUTO_STOP_LOGGER = yes).
+ *	Meant to be used from init scripts.
+ * bootchartd (pid==1): as init, but then execs $bootchart_init, /init, /sbin/init
+ *	Meant to be used as kernel's init process.
+ */
+int bootchartd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int bootchartd_main(int argc UNUSED_PARAM, char **argv)
+{
+	pid_t parent_pid, logger_pid;
+	smallint cmd;
+	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 or INIT state. 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 started by kernel, PATH might be not set.
+		 * And in order to run tar we may need PATH to be set:
+		 */
+		if (cmd == CMD_PID1 && !getenv("PATH"))
+			putenv((char*)bb_PATH_root_path);
+		tempdir = make_tempdir(cmd == CMD_START ? argv[2] : NULL);
+		do_logging();
+		finalize(tempdir);
+		return EXIT_SUCCESS;
+	}
+
+	/* parent */
+
+	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 exec '%s'", "/sbin/init");
+	}
+
+	if (cmd == CMD_START && argv[2]) { /* "start PROG ARGS" */
+		pid_t pid = vfork();
+		if (pid < 0)
+			bb_perror_msg_and_die("vfork");
+		if (pid == 0) { /* child */
+			argv += 2;
+			execvp(argv[0], argv);
+			bb_perror_msg_and_die("can't exec '%s'", argv[0]);
+		}
+		/* parent */
+		waitpid(pid, NULL, 0);
+		kill(logger_pid, SIGUSR1);
+	}
+
+	return EXIT_SUCCESS;
+}