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-rw-r--r--procps/iostat.c306
1 files changed, 125 insertions, 181 deletions
diff --git a/procps/iostat.c b/procps/iostat.c
index 28bf4dec2..cd233c72f 100644
--- a/procps/iostat.c
+++ b/procps/iostat.c
@@ -24,8 +24,6 @@
#define debug(fmt, ...) ((void)0)
#define MAX_DEVICE_NAME 12
-#define CURRENT 0
-#define LAST 1
#if 1
typedef unsigned long long cputime_t;
@@ -39,18 +37,33 @@ typedef long icputime_t;
# 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;
+enum {
+ STATS_CPU_USER,
+ STATS_CPU_NICE,
+ STATS_CPU_SYSTEM,
+ STATS_CPU_IDLE,
+ STATS_CPU_IOWAIT,
+ STATS_CPU_IRQ,
+ STATS_CPU_SOFTIRQ,
+ STATS_CPU_STEAL,
+ STATS_CPU_GUEST,
+
+ GLOBAL_UPTIME,
+ SMP_UPTIME,
+
+ N_STATS_CPU,
};
+typedef struct {
+ cputime_t vector[N_STATS_CPU];
+} stats_cpu_t;
+
+typedef struct {
+ stats_cpu_t *prev;
+ stats_cpu_t *curr;
+ cputime_t itv;
+} stats_cpu_pair_t;
+
struct stats_dev {
char dname[MAX_DEVICE_NAME];
unsigned long long rd_sectors;
@@ -59,24 +72,24 @@ struct stats_dev {
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;
+ llist_t *dev_list; /* List of devices entered on the command line */
struct stats_dev *saved_stats_dev;
struct tm tmtime;
+ struct {
+ const char *str;
+ unsigned div;
+ } unit;
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+ G.unit.str = "Blk"; \
+ G.unit.div = 1; \
} while (0)
/* Must match option string! */
@@ -104,12 +117,12 @@ static void print_header(void)
char buf[16];
struct utsname uts;
- if (uname(&uts) < 0)
- bb_perror_msg_and_die("uname");
+ uname(&uts); /* never fails */
+ /* Date representation for the current locale */
strftime(buf, sizeof(buf), "%x", &G.tmtime);
- printf("%s %s (%s) \t%s \t_%s_\t(%d CPU)\n\n",
+ printf("%s %s (%s) \t%s \t_%s_\t(%u CPU)\n\n",
uts.sysname, uts.release, uts.nodename,
buf, uts.machine, G.total_cpus);
}
@@ -124,6 +137,8 @@ static void get_localtime(struct tm *ptm)
static void print_timestamp(void)
{
char buf[20];
+ /* %x: date representation for the current locale */
+ /* %X: time representation for the current locale */
strftime(buf, sizeof(buf), "%x %X", &G.tmtime);
printf("%s\n", buf);
}
@@ -131,14 +146,12 @@ static void print_timestamp(void)
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");
+ if (fscanf(fp, "%lu.%lu", &sec, &dec) != 2)
+ bb_error_msg_and_die("can't read '%s'", "/proc/uptime");
fclose(fp);
@@ -146,10 +159,10 @@ static cputime_t get_smp_uptime(void)
}
/* Fetch CPU statistics from /proc/stat */
-static void get_cpu_statistics(struct stats_cpu *sc)
+static void get_cpu_statistics(stats_cpu_t *sc)
{
FILE *fp;
- char buf[1024];
+ char buf[1024], *ibuf = buf + 4;
fp = xfopen_for_read("/proc/stat");
@@ -157,28 +170,25 @@ static void get_cpu_statistics(struct stats_cpu *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);
+ if (!starts_with_cpu(buf) || buf[3] != ' ') {
+ continue;
}
+ for (int i = STATS_CPU_USER; i <= STATS_CPU_GUEST; i++) {
+ ibuf = skip_whitespace(ibuf);
+ sscanf(ibuf, "%"FMT_DATA"u", &sc->vector[i]);
+ if (i != STATS_CPU_GUEST) {
+ sc->vector[GLOBAL_UPTIME] += sc->vector[i];
+ }
+ ibuf = skip_non_whitespace(ibuf);
+ }
+ break;
}
- fclose(fp);
-}
+ if (this_is_smp()) {
+ sc->vector[SMP_UPTIME] = get_smp_uptime();
+ }
-/*
- * 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;
+ fclose(fp);
}
static ALWAYS_INLINE cputime_t get_interval(cputime_t old, cputime_t new)
@@ -219,65 +229,51 @@ 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)
+static void print_stats_cpu_struct(stats_cpu_pair_t *stats)
{
+ cputime_t *p = stats->prev->vector;
+ cputime_t *c = stats->curr->vector;
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)
+ percent_value(p[STATS_CPU_USER] , c[STATS_CPU_USER] , stats->itv),
+ percent_value(p[STATS_CPU_NICE] , c[STATS_CPU_NICE] , stats->itv),
+ percent_value(p[STATS_CPU_SYSTEM] + p[STATS_CPU_SOFTIRQ] + p[STATS_CPU_IRQ],
+ c[STATS_CPU_SYSTEM] + c[STATS_CPU_SOFTIRQ] + c[STATS_CPU_IRQ], stats->itv),
+ percent_value(p[STATS_CPU_IOWAIT], c[STATS_CPU_IOWAIT], stats->itv),
+ percent_value(p[STATS_CPU_STEAL] , c[STATS_CPU_STEAL] , stats->itv),
+ percent_value(p[STATS_CPU_IDLE] , c[STATS_CPU_IDLE] , stats->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",
+ printf("%-13s %8.2f %12.2f %12.2f %10llu %10llu \n", c->dname,
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);
+ percent_value(p->rd_sectors, c->rd_sectors, itv) / G.unit.div,
+ percent_value(p->wr_sectors, c->wr_sectors, itv) / G.unit.div,
+ (c->rd_sectors - p->rd_sectors) / G.unit.div,
+ (c->wr_sectors - p->wr_sectors) / G.unit.div);
}
-static void cpu_report(const struct stats_cpu *last,
- const struct stats_cpu *cur,
- cputime_t itv)
+static void cpu_report(stats_cpu_pair_t *stats)
{
/* Always print a header */
puts("avg-cpu: %user %nice %system %iowait %steal %idle");
/* Print current statistics */
- print_stats_cpu_struct(last, cur, itv);
+ print_stats_cpu_struct(stats);
}
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");
+ printf("Device:%15s%6s%s/s%6s%s/s%6s%s%6s%s\n", "tps",
+ G.unit.str, "_read", G.unit.str, "_wrtn",
+ G.unit.str, "_read", G.unit.str, "_wrtn");
}
/*
@@ -289,37 +285,6 @@ static int is_partition(const char *dev)
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;
@@ -356,7 +321,7 @@ static void do_disk_statistics(cputime_t itv)
break;
}
- if (!G.devlist_i && !is_partition(sd.dname)) {
+ if (!G.dev_list && !is_partition(sd.dname)) {
/* User didn't specify device */
if (!G.show_all && !sd.rd_ops && !sd.wr_ops) {
/* Don't print unused device */
@@ -367,7 +332,7 @@ static void do_disk_statistics(cputime_t itv)
i++;
} else {
/* Is device in device list? */
- if (is_dev_in_dlist(sd.dname)) {
+ if (llist_find_str(G.dev_list, sd.dname)) {
/* Print current statistics */
print_stats_dev_struct(&G.saved_stats_dev[i], &sd, itv);
G.saved_stats_dev[i] = sd;
@@ -389,28 +354,6 @@ static void dev_report(cputime_t itv)
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;
@@ -440,18 +383,6 @@ static unsigned get_number_of_devices(void)
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"
@@ -465,19 +396,17 @@ static int number_of_ALL_on_cmdline(char **argv)
//usage: "\n -m Use Mb/s"
int iostat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int iostat_main(int argc, char **argv)
+int iostat_main(int argc UNUSED_PARAM, char **argv)
{
int opt, dev_num;
- unsigned interval = 0;
+ unsigned interval;
int count;
- cputime_t global_uptime[2] = { 0 };
- cputime_t smp_uptime[2] = { 0 };
- cputime_t itv;
- struct stats_cpu stats_cur, stats_last;
+ stats_cpu_t stats_data[2];
+ smallint current_stats;
INIT_G();
- memset(&stats_last, 0, sizeof(stats_last));
+ memset(&stats_data, 0, sizeof(stats_data));
/* Get number of clock ticks per sec */
G.clk_tck = get_user_hz();
@@ -496,26 +425,24 @@ int iostat_main(int argc, char **argv)
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 */
+ dev_num = 0;
while (*argv && !isdigit(*argv[0])) {
if (strcmp(*argv, "ALL") != 0) {
/* If not ALL, save device name */
- save_to_devlist(*argv);
+ char *dev_name = skip_dev_pfx(*argv);
+ if (!llist_find_str(G.dev_list, dev_name)) {
+ llist_add_to(&G.dev_list, dev_name);
+ dev_num++;
+ }
} else {
G.show_all = 1;
}
argv++;
}
+ interval = 0;
count = 1;
if (*argv) {
/* Get interval */
@@ -534,28 +461,46 @@ int iostat_main(int argc, char **argv)
);
}
+ if (opt & OPT_m) {
+ G.unit.str = " MB";
+ G.unit.div = 2048;
+ }
+
+ if (opt & OPT_k) {
+ G.unit.str = " kB";
+ G.unit.div = 2;
+ }
+
+ get_localtime(&G.tmtime);
+
/* Display header */
print_header();
+ current_stats = 0;
/* Main loop */
for (;;) {
+ stats_cpu_pair_t stats;
+
+ stats.prev = &stats_data[current_stats ^ 1];
+ stats.curr = &stats_data[current_stats];
+
/* 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_cpu_statistics(stats.curr);
/* Get interval */
- itv = get_interval(global_uptime[LAST], global_uptime[CURRENT]);
+ stats.itv = get_interval(
+ stats.prev->vector[GLOBAL_UPTIME],
+ stats.curr->vector[GLOBAL_UPTIME]
+ );
if (opt & OPT_t)
print_timestamp();
if (opt & OPT_c) {
- cpu_report(&stats_last, &stats_cur, itv);
+ cpu_report(&stats);
if (opt & OPT_d)
/* Separate outputs by a newline */
bb_putchar('\n');
@@ -563,32 +508,31 @@ int iostat_main(int argc, char **argv)
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];
+ stats.itv = get_interval(
+ stats.prev->vector[SMP_UPTIME],
+ stats.curr->vector[SMP_UPTIME]
+ );
}
- dev_report(itv);
+ dev_report(stats.itv);
}
+ bb_putchar('\n');
+
if (count > 0) {
if (--count == 0)
break;
}
- /* Backup current stats */
- global_uptime[LAST] = global_uptime[CURRENT];
- stats_last = stats_cur;
+ /* Swap stats */
+ current_stats ^= 1;
- bb_putchar('\n');
sleep(interval);
}
- bb_putchar('\n');
-
if (ENABLE_FEATURE_CLEAN_UP) {
- free(&G);
- free(G.dlist);
+ llist_free(G.dev_list, NULL);
free(G.saved_stats_dev);
+ free(&G);
}
return EXIT_SUCCESS;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 08:57:17 +0000