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function old new delta packed_usage 28706 28623 -83 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
536 lines
12 KiB
C
536 lines
12 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Report CPU and I/O stats, based on sysstat version 9.1.2 by Sebastien Godard
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*
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* Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config IOSTAT
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//config: bool "iostat"
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//config: default y
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//config: help
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//config: Report CPU and I/O statistics
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//applet:IF_IOSTAT(APPLET(iostat, BB_DIR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_IOSTAT) += iostat.o
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#include "libbb.h"
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#include <sys/utsname.h> /* struct utsname */
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//#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
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#define debug(fmt, ...) ((void)0)
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#define MAX_DEVICE_NAME 12
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#define MAX_DEVICE_NAME_STR "12"
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#if 1
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typedef unsigned long long cputime_t;
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typedef long long icputime_t;
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# define FMT_DATA "ll"
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# define CPUTIME_MAX (~0ULL)
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#else
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typedef unsigned long cputime_t;
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typedef long icputime_t;
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# define FMT_DATA "l"
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# define CPUTIME_MAX (~0UL)
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#endif
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enum {
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STATS_CPU_USER,
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STATS_CPU_NICE,
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STATS_CPU_SYSTEM,
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STATS_CPU_IDLE,
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STATS_CPU_IOWAIT,
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STATS_CPU_IRQ,
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STATS_CPU_SOFTIRQ,
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STATS_CPU_STEAL,
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STATS_CPU_GUEST,
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GLOBAL_UPTIME,
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SMP_UPTIME,
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N_STATS_CPU,
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};
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typedef struct {
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cputime_t vector[N_STATS_CPU];
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} stats_cpu_t;
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typedef struct {
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stats_cpu_t *prev;
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stats_cpu_t *curr;
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cputime_t itv;
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} stats_cpu_pair_t;
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typedef struct {
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unsigned long long rd_sectors;
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unsigned long long wr_sectors;
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unsigned long rd_ops;
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unsigned long wr_ops;
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} stats_dev_data_t;
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typedef struct stats_dev {
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struct stats_dev *next;
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char dname[MAX_DEVICE_NAME + 1];
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stats_dev_data_t prev_data;
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stats_dev_data_t curr_data;
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} stats_dev_t;
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/* Globals. Sort by size and access frequency. */
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struct globals {
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smallint show_all;
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unsigned total_cpus; /* Number of CPUs */
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unsigned clk_tck; /* Number of clock ticks per second */
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llist_t *dev_name_list; /* List of devices entered on the command line */
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stats_dev_t *stats_dev_list;
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struct tm tmtime;
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struct {
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const char *str;
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unsigned div;
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} unit;
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};
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#define G (*ptr_to_globals)
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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G.unit.str = "Blk"; \
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G.unit.div = 1; \
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} while (0)
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/* Must match option string! */
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enum {
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OPT_c = 1 << 0,
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OPT_d = 1 << 1,
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OPT_t = 1 << 2,
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OPT_z = 1 << 3,
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OPT_k = 1 << 4,
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OPT_m = 1 << 5,
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};
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static ALWAYS_INLINE unsigned get_user_hz(void)
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{
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return sysconf(_SC_CLK_TCK);
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}
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static ALWAYS_INLINE int this_is_smp(void)
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{
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return (G.total_cpus > 1);
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}
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static void print_header(void)
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{
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char buf[32];
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struct utsname uts;
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uname(&uts); /* never fails */
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/* Date representation for the current locale */
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strftime(buf, sizeof(buf), "%x", &G.tmtime);
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printf("%s %s (%s) \t%s \t_%s_\t(%u CPU)\n\n",
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uts.sysname, uts.release, uts.nodename,
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buf, uts.machine, G.total_cpus);
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}
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static void get_localtime(struct tm *ptm)
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{
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time_t timer;
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time(&timer);
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localtime_r(&timer, ptm);
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}
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static void print_timestamp(void)
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{
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char buf[64];
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/* %x: date representation for the current locale */
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/* %X: time representation for the current locale */
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strftime(buf, sizeof(buf), "%x %X", &G.tmtime);
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printf("%s\n", buf);
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}
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static cputime_t get_smp_uptime(void)
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{
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FILE *fp;
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unsigned long sec, dec;
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fp = xfopen_for_read("/proc/uptime");
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if (fscanf(fp, "%lu.%lu", &sec, &dec) != 2)
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bb_error_msg_and_die("can't read '%s'", "/proc/uptime");
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fclose(fp);
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return (cputime_t)sec * G.clk_tck + dec * G.clk_tck / 100;
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}
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/* Fetch CPU statistics from /proc/stat */
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static void get_cpu_statistics(stats_cpu_t *sc)
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{
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FILE *fp;
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char buf[1024];
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fp = xfopen_for_read("/proc/stat");
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memset(sc, 0, sizeof(*sc));
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while (fgets(buf, sizeof(buf), fp)) {
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int i;
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char *ibuf;
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/* Does the line start with "cpu "? */
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if (!starts_with_cpu(buf) || buf[3] != ' ') {
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continue;
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}
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ibuf = buf + 4;
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for (i = STATS_CPU_USER; i <= STATS_CPU_GUEST; i++) {
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ibuf = skip_whitespace(ibuf);
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sscanf(ibuf, "%"FMT_DATA"u", &sc->vector[i]);
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if (i != STATS_CPU_GUEST) {
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sc->vector[GLOBAL_UPTIME] += sc->vector[i];
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}
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ibuf = skip_non_whitespace(ibuf);
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}
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break;
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}
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if (this_is_smp()) {
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sc->vector[SMP_UPTIME] = get_smp_uptime();
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}
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fclose(fp);
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}
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static ALWAYS_INLINE cputime_t get_interval(cputime_t old, cputime_t new)
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{
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cputime_t itv = new - old;
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return (itv == 0) ? 1 : itv;
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}
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#if CPUTIME_MAX > 0xffffffff
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/*
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* Handle overflow conditions properly for counters which can have
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* less bits than cputime_t, depending on the kernel version.
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*/
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/* Surprisingly, on 32bit inlining is a size win */
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static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
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{
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cputime_t v = curr - prev;
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if ((icputime_t)v < 0 /* curr < prev - counter overflow? */
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&& prev <= 0xffffffff /* kernel uses 32bit value for the counter? */
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) {
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/* Add 33th bit set to 1 to curr, compensating for the overflow */
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/* double shift defeats "warning: left shift count >= width of type" */
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v += ((cputime_t)1 << 16) << 16;
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}
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return v;
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}
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#else
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static ALWAYS_INLINE cputime_t overflow_safe_sub(cputime_t prev, cputime_t curr)
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{
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return curr - prev;
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}
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#endif
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static double percent_value(cputime_t prev, cputime_t curr, cputime_t itv)
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{
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return ((double)overflow_safe_sub(prev, curr)) / itv * 100;
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}
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static void print_stats_cpu_struct(stats_cpu_pair_t *stats)
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{
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cputime_t *p = stats->prev->vector;
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cputime_t *c = stats->curr->vector;
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printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
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percent_value(p[STATS_CPU_USER] , c[STATS_CPU_USER] , stats->itv),
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percent_value(p[STATS_CPU_NICE] , c[STATS_CPU_NICE] , stats->itv),
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percent_value(p[STATS_CPU_SYSTEM] + p[STATS_CPU_SOFTIRQ] + p[STATS_CPU_IRQ],
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c[STATS_CPU_SYSTEM] + c[STATS_CPU_SOFTIRQ] + c[STATS_CPU_IRQ], stats->itv),
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percent_value(p[STATS_CPU_IOWAIT], c[STATS_CPU_IOWAIT], stats->itv),
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percent_value(p[STATS_CPU_STEAL] , c[STATS_CPU_STEAL] , stats->itv),
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percent_value(p[STATS_CPU_IDLE] , c[STATS_CPU_IDLE] , stats->itv)
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);
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}
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static void cpu_report(stats_cpu_pair_t *stats)
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{
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/* Always print a header */
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puts("avg-cpu: %user %nice %system %iowait %steal %idle");
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/* Print current statistics */
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print_stats_cpu_struct(stats);
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}
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static void print_stats_dev_struct(stats_dev_t *stats_dev, cputime_t itv)
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{
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stats_dev_data_t *p = &stats_dev->prev_data;
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stats_dev_data_t *c = &stats_dev->curr_data;
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if (option_mask32 & OPT_z)
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if (p->rd_ops == c->rd_ops && p->wr_ops == c->wr_ops)
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return;
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printf("%-13s %8.2f %12.2f %12.2f %10llu %10llu\n",
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stats_dev->dname,
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percent_value(p->rd_ops + p->wr_ops, c->rd_ops + c->wr_ops, itv),
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percent_value(p->rd_sectors, c->rd_sectors, itv) / G.unit.div,
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percent_value(p->wr_sectors, c->wr_sectors, itv) / G.unit.div,
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(c->rd_sectors - p->rd_sectors) / G.unit.div,
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(c->wr_sectors - p->wr_sectors) / G.unit.div
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);
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}
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static void print_devstat_header(void)
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{
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printf("Device:%15s%6s%s/s%6s%s/s%6s%s%6s%s\n",
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"tps",
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G.unit.str, "_read", G.unit.str, "_wrtn",
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G.unit.str, "_read", G.unit.str, "_wrtn"
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);
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}
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/*
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* Is input partition of format [sdaN]?
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*/
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static int is_partition(const char *dev)
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{
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/* Ok, this is naive... */
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return ((dev[0] - 's') | (dev[1] - 'd') | (dev[2] - 'a')) == 0 && isdigit(dev[3]);
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}
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static stats_dev_t *stats_dev_find_or_new(const char *dev_name)
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{
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stats_dev_t **curr = &G.stats_dev_list;
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while (*curr != NULL) {
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if (strcmp((*curr)->dname, dev_name) == 0)
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return *curr;
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curr = &(*curr)->next;
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}
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*curr = xzalloc(sizeof(stats_dev_t));
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strncpy((*curr)->dname, dev_name, MAX_DEVICE_NAME);
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return *curr;
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}
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static void stats_dev_free(stats_dev_t *stats_dev)
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{
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if (stats_dev) {
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stats_dev_free(stats_dev->next);
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free(stats_dev);
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}
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}
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static void do_disk_statistics(cputime_t itv)
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{
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char buf[128];
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char dev_name[MAX_DEVICE_NAME + 1];
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unsigned long long rd_sec_or_dummy;
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unsigned long long wr_sec_or_dummy;
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stats_dev_data_t *curr_data;
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stats_dev_t *stats_dev;
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FILE *fp;
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int rc;
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fp = xfopen_for_read("/proc/diskstats");
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/* Read and possibly print stats from /proc/diskstats */
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while (fgets(buf, sizeof(buf), fp)) {
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sscanf(buf, "%*s %*s %"MAX_DEVICE_NAME_STR"s", dev_name);
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if (G.dev_name_list) {
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/* Is device name in list? */
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if (!llist_find_str(G.dev_name_list, dev_name))
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continue;
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} else if (is_partition(dev_name)) {
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continue;
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}
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stats_dev = stats_dev_find_or_new(dev_name);
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curr_data = &stats_dev->curr_data;
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rc = sscanf(buf, "%*s %*s %*s %lu %llu %llu %llu %lu %*s %llu",
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&curr_data->rd_ops,
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&rd_sec_or_dummy,
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&curr_data->rd_sectors,
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&wr_sec_or_dummy,
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&curr_data->wr_ops,
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&curr_data->wr_sectors);
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if (rc != 6) {
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curr_data->rd_sectors = rd_sec_or_dummy;
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curr_data->wr_sectors = wr_sec_or_dummy;
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//curr_data->rd_ops = ;
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curr_data->wr_ops = (unsigned long)curr_data->rd_sectors;
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}
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if (!G.dev_name_list /* User didn't specify device */
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&& !G.show_all
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&& curr_data->rd_ops == 0
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&& curr_data->wr_ops == 0
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) {
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/* Don't print unused device */
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continue;
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}
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/* Print current statistics */
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print_stats_dev_struct(stats_dev, itv);
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stats_dev->prev_data = *curr_data;
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}
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fclose(fp);
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}
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static void dev_report(cputime_t itv)
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{
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/* Always print a header */
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print_devstat_header();
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/* Fetch current disk statistics */
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do_disk_statistics(itv);
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}
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//usage:#define iostat_trivial_usage
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//usage: "[-c] [-d] [-t] [-z] [-k|-m] [ALL|BLOCKDEV...] [INTERVAL [COUNT]]"
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//usage:#define iostat_full_usage "\n\n"
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//usage: "Report CPU and I/O statistics\n"
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//usage: "\n -c Show CPU utilization"
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//usage: "\n -d Show device utilization"
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//usage: "\n -t Print current time"
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//usage: "\n -z Omit devices with no activity"
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//usage: "\n -k Use kb/s"
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//usage: "\n -m Use Mb/s"
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int iostat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int iostat_main(int argc UNUSED_PARAM, char **argv)
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{
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int opt;
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unsigned interval;
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int count;
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stats_cpu_t stats_data[2];
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smallint current_stats;
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INIT_G();
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memset(&stats_data, 0, sizeof(stats_data));
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/* Get number of clock ticks per sec */
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G.clk_tck = get_user_hz();
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/* Determine number of CPUs */
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G.total_cpus = get_cpu_count();
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if (G.total_cpus == 0)
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G.total_cpus = 1;
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/* Parse and process arguments */
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/* -k and -m are mutually exclusive */
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opt_complementary = "k--m:m--k";
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opt = getopt32(argv, "cdtzkm");
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if (!(opt & (OPT_c + OPT_d)))
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/* Default is -cd */
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opt |= OPT_c + OPT_d;
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argv += optind;
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/* Store device names into device list */
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while (*argv && !isdigit(*argv[0])) {
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if (strcmp(*argv, "ALL") != 0) {
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/* If not ALL, save device name */
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char *dev_name = skip_dev_pfx(*argv);
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if (!llist_find_str(G.dev_name_list, dev_name)) {
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llist_add_to(&G.dev_name_list, dev_name);
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}
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} else {
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G.show_all = 1;
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}
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argv++;
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}
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interval = 0;
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count = 1;
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if (*argv) {
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/* Get interval */
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interval = xatoi_positive(*argv);
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count = (interval != 0 ? -1 : 1);
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argv++;
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if (*argv)
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/* Get count value */
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count = xatoi_positive(*argv);
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}
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if (opt & OPT_m) {
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G.unit.str = " MB";
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G.unit.div = 2048;
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}
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if (opt & OPT_k) {
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G.unit.str = " kB";
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G.unit.div = 2;
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}
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get_localtime(&G.tmtime);
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/* Display header */
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print_header();
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current_stats = 0;
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/* Main loop */
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for (;;) {
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stats_cpu_pair_t stats;
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stats.prev = &stats_data[current_stats ^ 1];
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stats.curr = &stats_data[current_stats];
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/* Fill the time structure */
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get_localtime(&G.tmtime);
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/* Fetch current CPU statistics */
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get_cpu_statistics(stats.curr);
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/* Get interval */
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stats.itv = get_interval(
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stats.prev->vector[GLOBAL_UPTIME],
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stats.curr->vector[GLOBAL_UPTIME]
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);
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if (opt & OPT_t)
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print_timestamp();
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if (opt & OPT_c) {
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cpu_report(&stats);
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if (opt & OPT_d)
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/* Separate outputs by a newline */
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bb_putchar('\n');
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}
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if (opt & OPT_d) {
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if (this_is_smp()) {
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stats.itv = get_interval(
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stats.prev->vector[SMP_UPTIME],
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stats.curr->vector[SMP_UPTIME]
|
|
);
|
|
}
|
|
dev_report(stats.itv);
|
|
}
|
|
|
|
bb_putchar('\n');
|
|
|
|
if (count > 0) {
|
|
if (--count == 0)
|
|
break;
|
|
}
|
|
|
|
/* Swap stats */
|
|
current_stats ^= 1;
|
|
|
|
sleep(interval);
|
|
}
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
llist_free(G.dev_name_list, NULL);
|
|
stats_dev_free(G.stats_dev_list);
|
|
free(&G);
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|