1 /* vi: set sw=4 ts=4: */
3 * Report CPU and I/O stats, based on sysstat version 9.1.2 by Sebastien Godard
5 * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
10 //config:config IOSTAT
11 //config: bool "iostat"
14 //config: Report CPU and I/O statistics
16 //applet:IF_IOSTAT(APPLET(iostat, BB_DIR_BIN, BB_SUID_DROP))
18 //kbuild:lib-$(CONFIG_IOSTAT) += iostat.o
21 #include <sys/utsname.h> /* struct utsname */
23 //#define debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
24 #define debug(fmt, ...) ((void)0)
26 #define MAX_DEVICE_NAME 12
27 #define MAX_DEVICE_NAME_STR "12"
30 typedef unsigned long long cputime_t
;
31 typedef long long icputime_t
;
32 # define FMT_DATA "ll"
33 # define CPUTIME_MAX (~0ULL)
35 typedef unsigned long cputime_t
;
36 typedef long icputime_t
;
38 # define CPUTIME_MAX (~0UL)
59 cputime_t vector
[N_STATS_CPU
];
69 unsigned long long rd_sectors
;
70 unsigned long long wr_sectors
;
75 typedef struct stats_dev
{
76 struct stats_dev
*next
;
77 char dname
[MAX_DEVICE_NAME
+ 1];
78 stats_dev_data_t prev_data
;
79 stats_dev_data_t curr_data
;
82 /* Globals. Sort by size and access frequency. */
85 unsigned total_cpus
; /* Number of CPUs */
86 unsigned clk_tck
; /* Number of clock ticks per second */
87 llist_t
*dev_name_list
; /* List of devices entered on the command line */
88 stats_dev_t
*stats_dev_list
;
95 #define G (*ptr_to_globals)
96 #define INIT_G() do { \
97 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
102 /* Must match option string! */
112 static ALWAYS_INLINE
unsigned get_user_hz(void)
114 return sysconf(_SC_CLK_TCK
);
117 static ALWAYS_INLINE
int this_is_smp(void)
119 return (G
.total_cpus
> 1);
122 static void print_header(void)
127 uname(&uts
); /* never fails */
129 /* Date representation for the current locale */
130 strftime(buf
, sizeof(buf
), "%x", &G
.tmtime
);
132 printf("%s %s (%s) \t%s \t_%s_\t(%u CPU)\n\n",
133 uts
.sysname
, uts
.release
, uts
.nodename
,
134 buf
, uts
.machine
, G
.total_cpus
);
137 static void get_localtime(struct tm
*ptm
)
141 localtime_r(&timer
, ptm
);
144 static void print_timestamp(void)
147 /* %x: date representation for the current locale */
148 /* %X: time representation for the current locale */
149 strftime(buf
, sizeof(buf
), "%x %X", &G
.tmtime
);
153 static cputime_t
get_smp_uptime(void)
156 unsigned long sec
, dec
;
158 fp
= xfopen_for_read("/proc/uptime");
160 if (fscanf(fp
, "%lu.%lu", &sec
, &dec
) != 2)
161 bb_error_msg_and_die("can't read '%s'", "/proc/uptime");
165 return (cputime_t
)sec
* G
.clk_tck
+ dec
* G
.clk_tck
/ 100;
168 /* Fetch CPU statistics from /proc/stat */
169 static void get_cpu_statistics(stats_cpu_t
*sc
)
174 fp
= xfopen_for_read("/proc/stat");
176 memset(sc
, 0, sizeof(*sc
));
178 while (fgets(buf
, sizeof(buf
), fp
)) {
182 /* Does the line start with "cpu "? */
183 if (!starts_with_cpu(buf
) || buf
[3] != ' ') {
187 for (i
= STATS_CPU_USER
; i
<= STATS_CPU_GUEST
; i
++) {
188 ibuf
= skip_whitespace(ibuf
);
189 sscanf(ibuf
, "%"FMT_DATA
"u", &sc
->vector
[i
]);
190 if (i
!= STATS_CPU_GUEST
) {
191 sc
->vector
[GLOBAL_UPTIME
] += sc
->vector
[i
];
193 ibuf
= skip_non_whitespace(ibuf
);
199 sc
->vector
[SMP_UPTIME
] = get_smp_uptime();
205 static ALWAYS_INLINE cputime_t
get_interval(cputime_t old
, cputime_t
new)
207 cputime_t itv
= new - old
;
209 return (itv
== 0) ? 1 : itv
;
212 #if CPUTIME_MAX > 0xffffffff
214 * Handle overflow conditions properly for counters which can have
215 * less bits than cputime_t, depending on the kernel version.
217 /* Surprisingly, on 32bit inlining is a size win */
218 static ALWAYS_INLINE cputime_t
overflow_safe_sub(cputime_t prev
, cputime_t curr
)
220 cputime_t v
= curr
- prev
;
222 if ((icputime_t
)v
< 0 /* curr < prev - counter overflow? */
223 && prev
<= 0xffffffff /* kernel uses 32bit value for the counter? */
225 /* Add 33th bit set to 1 to curr, compensating for the overflow */
226 /* double shift defeats "warning: left shift count >= width of type" */
227 v
+= ((cputime_t
)1 << 16) << 16;
232 static ALWAYS_INLINE cputime_t
overflow_safe_sub(cputime_t prev
, cputime_t curr
)
238 static double percent_value(cputime_t prev
, cputime_t curr
, cputime_t itv
)
240 return ((double)overflow_safe_sub(prev
, curr
)) / itv
* 100;
243 static void print_stats_cpu_struct(stats_cpu_pair_t
*stats
)
245 cputime_t
*p
= stats
->prev
->vector
;
246 cputime_t
*c
= stats
->curr
->vector
;
247 printf(" %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
248 percent_value(p
[STATS_CPU_USER
] , c
[STATS_CPU_USER
] , stats
->itv
),
249 percent_value(p
[STATS_CPU_NICE
] , c
[STATS_CPU_NICE
] , stats
->itv
),
250 percent_value(p
[STATS_CPU_SYSTEM
] + p
[STATS_CPU_SOFTIRQ
] + p
[STATS_CPU_IRQ
],
251 c
[STATS_CPU_SYSTEM
] + c
[STATS_CPU_SOFTIRQ
] + c
[STATS_CPU_IRQ
], stats
->itv
),
252 percent_value(p
[STATS_CPU_IOWAIT
], c
[STATS_CPU_IOWAIT
], stats
->itv
),
253 percent_value(p
[STATS_CPU_STEAL
] , c
[STATS_CPU_STEAL
] , stats
->itv
),
254 percent_value(p
[STATS_CPU_IDLE
] , c
[STATS_CPU_IDLE
] , stats
->itv
)
258 static void cpu_report(stats_cpu_pair_t
*stats
)
260 /* Always print a header */
261 puts("avg-cpu: %user %nice %system %iowait %steal %idle");
263 /* Print current statistics */
264 print_stats_cpu_struct(stats
);
267 static void print_stats_dev_struct(stats_dev_t
*stats_dev
, cputime_t itv
)
269 stats_dev_data_t
*p
= &stats_dev
->prev_data
;
270 stats_dev_data_t
*c
= &stats_dev
->curr_data
;
271 if (option_mask32
& OPT_z
)
272 if (p
->rd_ops
== c
->rd_ops
&& p
->wr_ops
== c
->wr_ops
)
275 printf("%-13s %8.2f %12.2f %12.2f %10llu %10llu\n",
277 percent_value(p
->rd_ops
+ p
->wr_ops
, c
->rd_ops
+ c
->wr_ops
, itv
),
278 percent_value(p
->rd_sectors
, c
->rd_sectors
, itv
) / G
.unit
.div
,
279 percent_value(p
->wr_sectors
, c
->wr_sectors
, itv
) / G
.unit
.div
,
280 (c
->rd_sectors
- p
->rd_sectors
) / G
.unit
.div
,
281 (c
->wr_sectors
- p
->wr_sectors
) / G
.unit
.div
285 static void print_devstat_header(void)
287 printf("Device:%15s%6s%s/s%6s%s/s%6s%s%6s%s\n",
289 G
.unit
.str
, "_read", G
.unit
.str
, "_wrtn",
290 G
.unit
.str
, "_read", G
.unit
.str
, "_wrtn"
295 * Is input partition of format [sdaN]?
297 static int is_partition(const char *dev
)
299 /* Ok, this is naive... */
300 return ((dev
[0] - 's') | (dev
[1] - 'd') | (dev
[2] - 'a')) == 0 && isdigit(dev
[3]);
303 static stats_dev_t
*stats_dev_find_or_new(const char *dev_name
)
305 stats_dev_t
**curr
= &G
.stats_dev_list
;
307 while (*curr
!= NULL
) {
308 if (strcmp((*curr
)->dname
, dev_name
) == 0)
310 curr
= &(*curr
)->next
;
313 *curr
= xzalloc(sizeof(stats_dev_t
));
314 strncpy((*curr
)->dname
, dev_name
, MAX_DEVICE_NAME
);
318 static void stats_dev_free(stats_dev_t
*stats_dev
)
321 stats_dev_free(stats_dev
->next
);
326 static void do_disk_statistics(cputime_t itv
)
329 char dev_name
[MAX_DEVICE_NAME
+ 1];
330 unsigned long long rd_sec_or_dummy
;
331 unsigned long long wr_sec_or_dummy
;
332 stats_dev_data_t
*curr_data
;
333 stats_dev_t
*stats_dev
;
337 fp
= xfopen_for_read("/proc/diskstats");
338 /* Read and possibly print stats from /proc/diskstats */
339 while (fgets(buf
, sizeof(buf
), fp
)) {
340 sscanf(buf
, "%*s %*s %"MAX_DEVICE_NAME_STR
"s", dev_name
);
341 if (G
.dev_name_list
) {
342 /* Is device name in list? */
343 if (!llist_find_str(G
.dev_name_list
, dev_name
))
345 } else if (is_partition(dev_name
)) {
349 stats_dev
= stats_dev_find_or_new(dev_name
);
350 curr_data
= &stats_dev
->curr_data
;
352 rc
= sscanf(buf
, "%*s %*s %*s %lu %llu %llu %llu %lu %*s %llu",
355 &curr_data
->rd_sectors
,
358 &curr_data
->wr_sectors
);
360 curr_data
->rd_sectors
= rd_sec_or_dummy
;
361 curr_data
->wr_sectors
= wr_sec_or_dummy
;
362 //curr_data->rd_ops = ;
363 curr_data
->wr_ops
= (unsigned long)curr_data
->rd_sectors
;
366 if (!G
.dev_name_list
/* User didn't specify device */
368 && curr_data
->rd_ops
== 0
369 && curr_data
->wr_ops
== 0
371 /* Don't print unused device */
375 /* Print current statistics */
376 print_stats_dev_struct(stats_dev
, itv
);
377 stats_dev
->prev_data
= *curr_data
;
383 static void dev_report(cputime_t itv
)
385 /* Always print a header */
386 print_devstat_header();
388 /* Fetch current disk statistics */
389 do_disk_statistics(itv
);
392 //usage:#define iostat_trivial_usage
393 //usage: "[-c] [-d] [-t] [-z] [-k|-m] [ALL|BLOCKDEV...] [INTERVAL [COUNT]]"
394 //usage:#define iostat_full_usage "\n\n"
395 //usage: "Report CPU and I/O statistics\n"
396 //usage: "\n -c Show CPU utilization"
397 //usage: "\n -d Show device utilization"
398 //usage: "\n -t Print current time"
399 //usage: "\n -z Omit devices with no activity"
400 //usage: "\n -k Use kb/s"
401 //usage: "\n -m Use Mb/s"
403 int iostat_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
404 int iostat_main(int argc UNUSED_PARAM
, char **argv
)
409 stats_cpu_t stats_data
[2];
410 smallint current_stats
;
414 memset(&stats_data
, 0, sizeof(stats_data
));
416 /* Get number of clock ticks per sec */
417 G
.clk_tck
= get_user_hz();
419 /* Determine number of CPUs */
420 G
.total_cpus
= get_cpu_count();
421 if (G
.total_cpus
== 0)
424 /* Parse and process arguments */
425 /* -k and -m are mutually exclusive */
426 opt_complementary
= "k--m:m--k";
427 opt
= getopt32(argv
, "cdtzkm");
428 if (!(opt
& (OPT_c
+ OPT_d
)))
430 opt
|= OPT_c
+ OPT_d
;
434 /* Store device names into device list */
435 while (*argv
&& !isdigit(*argv
[0])) {
436 if (strcmp(*argv
, "ALL") != 0) {
437 /* If not ALL, save device name */
438 char *dev_name
= skip_dev_pfx(*argv
);
439 if (!llist_find_str(G
.dev_name_list
, dev_name
)) {
440 llist_add_to(&G
.dev_name_list
, dev_name
);
452 interval
= xatoi_positive(*argv
);
453 count
= (interval
!= 0 ? -1 : 1);
456 /* Get count value */
457 count
= xatoi_positive(*argv
);
470 get_localtime(&G
.tmtime
);
478 stats_cpu_pair_t stats
;
480 stats
.prev
= &stats_data
[current_stats
^ 1];
481 stats
.curr
= &stats_data
[current_stats
];
483 /* Fill the time structure */
484 get_localtime(&G
.tmtime
);
486 /* Fetch current CPU statistics */
487 get_cpu_statistics(stats
.curr
);
490 stats
.itv
= get_interval(
491 stats
.prev
->vector
[GLOBAL_UPTIME
],
492 stats
.curr
->vector
[GLOBAL_UPTIME
]
501 /* Separate outputs by a newline */
507 stats
.itv
= get_interval(
508 stats
.prev
->vector
[SMP_UPTIME
],
509 stats
.curr
->vector
[SMP_UPTIME
]
512 dev_report(stats
.itv
);
528 if (ENABLE_FEATURE_CLEAN_UP
) {
529 llist_free(G
.dev_name_list
, NULL
);
530 stats_dev_free(G
.stats_dev_list
);