iostat: new applet. 2800 bytes

Signed-off-by: Marek Polacek <mmpolacek@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 615 insertions, 0 deletions

diff --git a/procps/iostat.c b/procps/iostat.c
new file mode 100644
index 0000000..573419e
--- /dev/null
+++ b/procps/iostat.c
@@ -0,0 +1,615 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Report CPU and I/O stats, based on sysstat version 9.1.2 by Sebastien Godard
+ *
+ * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
+ *
+ * Licensed under GPLv2, see file License in this tarball for details.
+ */
+
+//applet:IF_IOSTAT(APPLET(iostat, _BB_DIR_BIN, _BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_IOSTAT) += iostat.o
+
+//config:config IOSTAT
+//config:	bool "iostat"
+//config:	default y
+//config:	help
+//config:	  Report CPU and I/O statistics
+
+#include "libbb.h"
+#include <sys/utsname.h>	/* Need struct utsname */
+
+#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
+//#define debug(fmt, ...) ((void)0)
+
+#define MAX_DEVICE_NAME		12
+#define CURRENT				0
+#define LAST				1
+
+#if 1
+typedef unsigned long long cputime_t;
+typedef long long icputime_t;
+# define FMT_DATA "ll"
+# define CPUTIME_MAX (~0ULL)
+#else
+typedef unsigned long cputime_t;
+typedef long icputime_t;
+# define FMT_DATA "l"
+# define CPUTIME_MAX (~0UL)
+#endif
+
+struct stats_cpu {
+	cputime_t cpu_user;
+	cputime_t cpu_nice;
+	cputime_t cpu_system;
+	cputime_t cpu_idle;
+	cputime_t cpu_iowait;
+	cputime_t cpu_steal;
+	cputime_t cpu_irq;
+	cputime_t cpu_softirq;
+	cputime_t cpu_guest;
+};
+
+struct stats_dev {
+	char dname[MAX_DEVICE_NAME];
+	unsigned long long rd_sectors;
+	unsigned long long wr_sectors;
+	unsigned long rd_ops;
+	unsigned long wr_ops;
+};
+
+/* List of devices entered on the command line */
+struct device_list {
+	char dname[MAX_DEVICE_NAME];
+};
+
+/* Globals. Sort by size and access frequency. */
+struct globals {
+	smallint show_all;
+	unsigned devlist_i;             /* Index to the list of devices */
+	unsigned total_cpus;            /* Number of CPUs */
+	unsigned clk_tck;               /* Number of clock ticks per second */
+	struct device_list *dlist;
+	struct stats_dev *saved_stats_dev;
+	struct tm tmtime;
+};
+#define G (*ptr_to_globals)
+#define INIT_G() do { \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+} while (0)
+
+/* Must match option string! */
+enum {
+	OPT_c = 1 << 0,
+	OPT_d = 1 << 1,
+	OPT_t = 1 << 2,
+	OPT_z = 1 << 3,
+	OPT_k = 1 << 4,
+	OPT_m = 1 << 5,
+};
+
+static ALWAYS_INLINE unsigned get_user_hz(void)
+{
+	return sysconf(_SC_CLK_TCK);
+}
+
+static ALWAYS_INLINE int this_is_smp(void)
+{
+	return (G.total_cpus > 1);
+}
+
+static void print_header(void)
+{
+	char buf[16];
+	struct utsname uts;
+
+	if (uname(&uts) < 0)
+		bb_perror_msg_and_die("uname");
+
+	strftime(buf, sizeof(buf), "%x", &G.tmtime);
+
+	printf("%s %s (%s) \t%s \t_%s_\t(%d CPU)\n\n",
+			uts.sysname, uts.release, uts.nodename,
+			buf, uts.machine, G.total_cpus);
+}
+
+static int get_number_of_cpus(void)
+{
+#ifdef _SC_NPROCESSORS_CONF
+	return sysconf(_SC_NPROCESSORS_CONF);
+#else
+	char buf[128];
+	int n = 0;
+	FILE *fp;
+
+	fp = xfopen_for_read("/proc/cpuinfo");
+
+	while (fgets(buf, sizeof(buf), fp))
+		if (strncmp(buf, "processor\t:", 11) == 0)
+			n++;
+
+	fclose(fp);
+	return n;
+#endif
+}
+
+static void get_localtime(struct tm *ptm)
+{
+	time_t timer;
+	time(&timer);
+	localtime_r(&timer, ptm);
+}
+
+static void print_timestamp(void)
+{
+	char buf[20];
+	strftime(buf, sizeof(buf), "%x %X", &G.tmtime);
+	printf("%s\n", buf);
+}
+
+/* Does str start with "cpu"? */
+static int starts_with_cpu(const char *str)
+{
+	return ((str[0] - 'c') | (str[1] - 'p') | (str[2] - 'u')) == 0;
+}
+
+/* Fetch CPU statistics from /proc/stat */
+static void get_cpu_statistics(struct stats_cpu *sc)
+{
+	FILE *fp;
+	char buf[1024];
+
+	fp = xfopen_for_read("/proc/stat");
+
+	memset(sc, 0, sizeof(*sc));
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		/* Does the line starts with "cpu "? */
+		if (starts_with_cpu(buf) && buf[3] == ' ') {
+			sscanf(buf + 4 + 1,
+				"%"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"
+				FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u %"FMT_DATA"u",
+				&sc->cpu_user, &sc->cpu_nice, &sc->cpu_system,
+				&sc->cpu_idle, &sc->cpu_iowait, &sc->cpu_irq,
+				&sc->cpu_softirq, &sc->cpu_steal, &sc->cpu_guest);
+		}
+	}
+
+	fclose(fp);
+}
+
+static cputime_t get_smp_uptime(void)
+{
+	FILE *fp;
+	char buf[sizeof(long)*3 * 2 + 4];
+	unsigned long sec, dec;
+
+	fp = xfopen_for_read("/proc/uptime");
+
+	if (fgets(buf, sizeof(buf), fp))
+		if (sscanf(buf, "%lu.%lu", &sec, &dec) != 2)
+			bb_error_msg_and_die("can't read /proc/uptime");
+
+	fclose(fp);
+
+	return (cputime_t)sec * G.clk_tck + dec * G.clk_tck / 100;
+}
+
+/*
+ * Obtain current uptime in jiffies.
+ * Uptime is sum of individual CPUs' uptimes.
+ */
+static cputime_t get_uptime(const struct stats_cpu *sc)
+{
+	/* NB: Don't include cpu_guest, it is already in cpu_user */
+	return sc->cpu_user + sc->cpu_nice + sc->cpu_system + sc->cpu_idle +
+		+ sc->cpu_iowait + sc->cpu_irq + sc->cpu_steal + sc->cpu_softirq;
+}
+
+static ALWAYS_INLINE cputime_t get_interval(cputime_t old, cputime_t new)
+{
+	cputime_t itv = new - old;
+
+	return (itv == 0) ? 1 : itv;
+}
+
+#if CPUTIME_MAX > 0xffffffff
+/*
+ * Handle overflow conditions properly for counters which can have
+ * less bits than cputime_t, depending on the kernel version.
+ */
+/* Surprisingly, on 32bit inlining is a size win */
+static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
+{
+	cputime_t v = curr - prev;
+
+	if ((icputime_t)v < 0     /* curr < prev - counter overflow? */
+	 && prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
+	) {
+		/* Add 33th bit set to 1 to curr, compensating for the overflow */
+		/* double shift defeats "warning: left shift count >= width of type" */
+		v += ((cputime_t)1 << 16) << 16;
+	}
+	return v;
+}
+#else
+static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
+{
+	return curr - prev;
+}
+#endif
+
+static double percent_value(cputime_t prev, cputime_t curr, cputime_t itv)
+{
+	return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
+}
+
+static void print_stats_cpu_struct(const struct stats_cpu *p,
+		const struct stats_cpu *c, cputime_t itv)
+{
+	printf("         %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f\n",
+		percent_value(p->cpu_user   , c->cpu_user   , itv),
+		percent_value(p->cpu_nice   , c->cpu_nice   , itv),
+		percent_value(p->cpu_system + p->cpu_softirq + p->cpu_irq,
+			c->cpu_system + c->cpu_softirq + c->cpu_irq, itv),
+		percent_value(p->cpu_iowait , c->cpu_iowait , itv),
+		percent_value(p->cpu_steal  , c->cpu_steal  , itv),
+		percent_value(p->cpu_idle   , c->cpu_idle   , itv)
+	);
+}
+
+static void print_stats_dev_struct(const struct stats_dev *p,
+		const struct stats_dev *c, cputime_t itv)
+{
+	int unit = 1;
+
+	if (option_mask32 & OPT_k)
+		unit = 2;
+	else if (option_mask32 & OPT_m)
+		unit = 2048;
+
+	if (option_mask32 & OPT_z)
+		if (p->rd_ops == c->rd_ops && p->wr_ops == c->wr_ops)
+			return;
+
+	printf("%-13s", c->dname);
+	printf(" %8.2f %12.2f %12.2f %10llu %10llu \n",
+		percent_value(p->rd_ops + p->wr_ops ,
+		/**/		  c->rd_ops + c->wr_ops , itv),
+		percent_value(p->rd_sectors, c->rd_sectors, itv) / unit,
+		percent_value(p->wr_sectors, c->wr_sectors, itv) / unit,
+		(c->rd_sectors - p->rd_sectors) / unit,
+		(c->wr_sectors - p->wr_sectors) / unit);
+}
+
+static void cpu_report(const struct stats_cpu *last,
+		const struct stats_cpu *cur,
+		cputime_t itv)
+{
+	/* Always print a header */
+	puts("avg-cpu:  %user   %nice %system %iowait  %steal   %idle");
+
+	/* Print current statistics */
+	print_stats_cpu_struct(last, cur, itv);
+}
+
+static void print_devstat_header(void)
+{
+	printf("Device:            tps");
+
+	if (option_mask32 & OPT_m)
+		puts("    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn");
+	else if (option_mask32 & OPT_k)
+		puts("    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn");
+	else
+		puts("   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn");
+}
+
+/*
+ * Is input partition of format [sdaN]?
+ */
+static int is_partition(const char *dev)
+{
+	/* Ok, this is naive... */
+	return ((dev[0] - 's') | (dev[1] - 'd') | (dev[2] - 'a')) == 0 && isdigit(dev[3]);
+}
+
+/*
+ * Return number of numbers on cmdline.
+ * Reasonable values are only 0 (no interval/count specified),
+ * 1 (interval specified) and 2 (both interval and count specified)
+ */
+static int numbers_on_cmdline(int argc, char *argv[])
+{
+	int sum = 0;
+
+	if (isdigit(argv[argc-1][0]))
+		sum++;
+	if (argc > 2 && isdigit(argv[argc-2][0]))
+		sum++;
+
+	return sum;
+}
+
+static int is_dev_in_dlist(const char *dev)
+{
+	int i;
+
+	/* Go through the device list */
+	for (i = 0; i < G.devlist_i; i++)
+		if (strcmp(G.dlist[i].dname, dev) == 0)
+			/* Found a match */
+			return 1;
+
+	/* No match found */
+	return 0;
+}
+
+static void do_disk_statistics(cputime_t itv)
+{
+	FILE *fp;
+	int rc;
+	int i = 0;
+	char buf[128];
+	unsigned major, minor;
+	unsigned long wr_ops, dummy;	/* %*lu for suppres the conversion wouldn't work */
+	unsigned long long rd_sec_or_wr_ops;
+	unsigned long long rd_sec_or_dummy, wr_sec_or_dummy, wr_sec;
+	struct stats_dev sd;
+
+	fp = xfopen_for_read("/proc/diskstats");
+
+	/* Read and possibly print stats from /proc/diskstats */
+	while (fgets(buf, sizeof(buf), fp)) {
+		rc = sscanf(buf, "%u %u %s %lu %llu %llu %llu %lu %lu %llu %lu %lu %lu %lu",
+			&major, &minor, sd.dname, &sd.rd_ops,
+			&rd_sec_or_dummy, &rd_sec_or_wr_ops, &wr_sec_or_dummy,
+			&wr_ops, &dummy, &wr_sec, &dummy, &dummy, &dummy, &dummy);
+
+		switch (rc) {
+		case 14:
+			sd.wr_ops = wr_ops;
+			sd.rd_sectors = rd_sec_or_wr_ops;
+			sd.wr_sectors = wr_sec;
+			break;
+		case 7:
+			sd.rd_sectors = rd_sec_or_dummy;
+			sd.wr_ops = (unsigned long)rd_sec_or_wr_ops;
+			sd.wr_sectors = wr_sec_or_dummy;
+			break;
+		default:
+			break;
+		}
+
+		if (!G.devlist_i && !is_partition(sd.dname)) {
+			/* User didn't specify device */
+			if (!G.show_all && !sd.rd_ops && !sd.wr_ops) {
+				/* Don't print unused device */
+				continue;
+			}
+			print_stats_dev_struct(&G.saved_stats_dev[i], &sd, itv);
+			G.saved_stats_dev[i] = sd;
+			i++;
+		} else {
+			/* Is device in device list? */
+			if (is_dev_in_dlist(sd.dname)) {
+				/* Print current statistics */
+				print_stats_dev_struct(&G.saved_stats_dev[i], &sd, itv);
+				G.saved_stats_dev[i] = sd;
+				i++;
+			} else
+				continue;
+		}
+	}
+}
+
+static void dev_report(cputime_t itv)
+{
+	/* Always print a header */
+	print_devstat_header();
+
+	/* Fetch current disk statistics */
+	do_disk_statistics(itv);
+}
+
+static void save_to_devlist(const char *dname)
+{
+	int i;
+	struct device_list *tmp = G.dlist;
+
+	if (strncmp(dname, "/dev/", 5) == 0)
+		/* We'll ignore prefix '/dev/' */
+		dname += 5;
+
+	/* Go through the list */
+	for (i = 0; i < G.devlist_i; i++, tmp++)
+		if (strcmp(tmp->dname, dname) == 0)
+			/* Already in the list */
+			return;
+
+	/* Add device name to the list */
+	strncpy(tmp->dname, dname, MAX_DEVICE_NAME - 1);
+
+	/* Update device list index */
+	G.devlist_i++;
+}
+
+static unsigned get_number_of_devices(void)
+{
+	FILE *fp;
+	char buf[128];
+	int rv;
+	unsigned n = 0;
+	unsigned long rd_ops, wr_ops;
+	char dname[MAX_DEVICE_NAME];
+
+	fp = xfopen_for_read("/proc/diskstats");
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		rv = sscanf(buf, "%*d %*d %s %lu %*u %*u %*u %lu",
+				dname, &rd_ops, &wr_ops);
+		if (rv == 2 || is_partition(dname))
+			/* A partition */
+			continue;
+		if (!rd_ops && !wr_ops) {
+			/* Unused device */
+			if (!G.show_all)
+				continue;
+		}
+		n++;
+	}
+
+	fclose(fp);
+	return n;
+}
+
+static int number_of_ALL_on_cmdline(char **argv)
+{
+	int alls = 0;
+
+	/* Iterate over cmd line arguments, count "ALL" */
+	while (*argv)
+		if (strcmp(*argv++, "ALL") == 0)
+			alls++;
+
+	return alls;
+}
+
+//usage:#define iostat_trivial_usage
+//usage:       "[-c] [-d] [-t] [-z] [-k|-m] [ALL|BLOCKDEV...] [INTERVAL [COUNT]]"
+//usage:#define iostat_full_usage "\n\n"
+//usage:       "Report CPU and I/O statistics\n"
+//usage:     "\nOptions:"
+//usage:     "\n	-c	Show CPU utilization"
+//usage:     "\n	-d	Show device utilization"
+//usage:     "\n	-t	Print current time"
+//usage:     "\n	-z	Omit devices with no activity"
+//usage:     "\n	-k	Use kb/s"
+//usage:     "\n	-m	Use Mb/s"
+
+int iostat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int iostat_main(int argc, char **argv)
+{
+	int opt, dev_num;
+	unsigned interval = 0;
+	int count = 0;
+	cputime_t global_uptime[2] = { 0 };
+	cputime_t smp_uptime[2] = { 0 };
+	cputime_t itv;
+	struct stats_cpu stats_cur, stats_last;
+
+	INIT_G();
+
+	memset(&stats_last, 0, sizeof(stats_last));
+
+	/* Get number of clock ticks per sec */
+	G.clk_tck = get_user_hz();
+
+	/* Determine number of CPUs */
+	G.total_cpus = get_number_of_cpus();
+
+	/* Parse and process arguments */
+	/* -k and -m are mutually exclusive */
+	opt_complementary = "k--m:m--k";
+	opt = getopt32(argv, "cdtzkm");
+	if (!(opt & (OPT_c + OPT_d)))
+		/* Default is -cd */
+		opt |= OPT_c + OPT_d;
+
+	argv += optind;
+	argc -= optind;
+
+	dev_num = argc - numbers_on_cmdline(argc, argv);
+	/* We don't want to allocate space for 'ALL' */
+	dev_num -= number_of_ALL_on_cmdline(argv);
+	if (dev_num > 0)
+		/* Make space for device list */
+		G.dlist = xzalloc(sizeof(G.dlist[0]) * dev_num);
+
+	/* Store device names into device list */
+	while (*argv && !isdigit(*argv[0])) {
+		if (strcmp(*argv, "ALL") != 0)
+			/* If not ALL, save device name */
+			save_to_devlist(*argv);
+		else
+			G.show_all = 1;
+		argv++;
+	}
+
+	if (*argv) {
+		/* Get interval */
+		interval = xatoi_u(*argv);
+		count = interval ? -1 : 1;
+		argv++;
+		if (*argv)
+			/* Get count value */
+			count = xatoi_u(*argv);
+	}
+
+	/* Allocate space for device stats */
+	if (opt & OPT_d) {
+		G.saved_stats_dev = xzalloc(sizeof(G.saved_stats_dev[0]) *
+				(dev_num ? dev_num : get_number_of_devices())
+		);
+	}
+
+	/* Display header */
+	print_header();
+
+	/* Main loop */
+	for (;;) {
+		/* Fill the time structure */
+		get_localtime(&G.tmtime);
+
+		/* Fetch current CPU statistics */
+		get_cpu_statistics(&stats_cur);
+
+		/* Fetch current uptime */
+		global_uptime[CURRENT] = get_uptime(&stats_cur);
+
+		/* Get interval */
+		itv = get_interval(global_uptime[LAST], global_uptime[CURRENT]);
+
+		if (opt & OPT_t)
+			print_timestamp();
+
+		if (opt & OPT_c) {
+			cpu_report(&stats_last, &stats_cur, itv);
+			if (opt & OPT_d)
+				/* Separate outputs by a newline */
+				bb_putchar('\n');
+		}
+
+		if (opt & OPT_d) {
+			if (this_is_smp()) {
+				smp_uptime[CURRENT] = get_smp_uptime();
+				itv = get_interval(smp_uptime[LAST], smp_uptime[CURRENT]);
+				smp_uptime[LAST] = smp_uptime[CURRENT];
+			}
+			dev_report(itv);
+		}
+
+		if (count > 0) {
+			if (--count == 0)
+				break;
+		}
+
+		/* Backup current stats */
+		global_uptime[LAST] = global_uptime[CURRENT];
+		stats_last = stats_cur;
+
+		bb_putchar('\n');
+		sleep(interval);
+	}
+
+	bb_putchar('\n');
+
+	if (ENABLE_FEATURE_CLEAN_UP) {
+		free(&G);
+		free(G.dlist);
+		free(G.saved_stats_dev);
+	}
+
+	return EXIT_SUCCESS;
+}