[git commit master 1/1] iostat: new applet. 2800 bytes
Denys Vlasenko
vda.linux at googlemail.com
Wed Aug 11 15:00:59 UTC 2010
commit: http://git.busybox.net/busybox/commit/?id=733f26f40708e0a4a2eb2475c446ae6a8e31f477
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
Signed-off-by: Marek Polacek <mmpolacek at gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
procps/iostat.c | 615 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 615 insertions(+), 0 deletions(-)
create mode 100644 procps/iostat.c
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 at 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;
+}
--
1.7.1
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