busybox/procps/iostat.c

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/* 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 source tree.
*/
//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 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);
}
/* 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 suppress 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;
}
}
fclose(fp);
}
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;
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_cpu_count();
if (G.total_cpus == 0)
G.total_cpus = 1;
/* 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++;
}
count = 1;
if (*argv) {
/* Get interval */
interval = xatoi_positive(*argv);
count = (interval != 0 ? -1 : 1);
argv++;
if (*argv)
/* Get count value */
count = xatoi_positive(*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;
}