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 000000000..573419e1c
--- /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;
+}