2 * Licensed under GPLv2, see file LICENSE in this source tree.
4 * Based on nanotop.c from floppyfw project
6 * Contact me: vda.linux@googlemail.com
10 //config: bool "nmeter (10 kb)"
13 //config: Prints selected system stats continuously, one line per update.
15 //applet:IF_NMETER(APPLET(nmeter, BB_DIR_USR_BIN, BB_SUID_DROP))
17 //kbuild:lib-$(CONFIG_NMETER) += nmeter.o
19 //usage:#define nmeter_trivial_usage
20 //usage: "[-d MSEC] FORMAT_STRING"
21 //usage:#define nmeter_full_usage "\n\n"
22 //usage: "Monitor system in real time"
24 //usage: "\n -d MSEC Milliseconds between updates, default:1000, none:-1"
26 //usage: "\nFormat specifiers:"
27 //usage: "\n %Nc or %[cN] CPU. N - bar size (default 10)"
28 //usage: "\n (displays: S:system U:user N:niced D:iowait I:irq i:softirq)"
29 //usage: "\n %[nINTERFACE] Network INTERFACE"
30 //usage: "\n %m Allocated memory"
31 //usage: "\n %[mf] Free memory"
32 //usage: "\n %[mt] Total memory"
33 //usage: "\n %s Allocated swap"
34 //usage: "\n %f Number of used file descriptors"
35 //usage: "\n %Ni Total/specific IRQ rate"
36 //usage: "\n %x Context switch rate"
37 //usage: "\n %p Forks"
38 //usage: "\n %[pn] # of processes"
39 //usage: "\n %b Block io"
40 //usage: "\n %Nt Time (with N decimal points)"
41 //usage: "\n %r Print <cr> instead of <lf> at EOL"
47 // disk_io: (3,0):(22272,17897,410702,4375,54750)
49 //TODO: use sysinfo libc call/syscall, if appropriate
50 // (faster than open/read/close):
51 // sysinfo({uptime=15017, loads=[5728, 15040, 16480]
52 // totalram=2107416576, freeram=211525632, sharedram=0, bufferram=157204480}
53 // totalswap=134209536, freeswap=134209536, procs=157})
56 #include "common_bufsiz.h"
58 typedef unsigned long long ullong;
60 enum { /* Preferably use powers of 2 */
61 PROC_MIN_FILE_SIZE = 256,
62 PROC_MAX_FILE_SIZE = 16 * 1024,
65 typedef struct proc_file {
71 static const char *const proc_name[] = {
72 "stat", // Must match the order of proc_file's!
81 // Sample generation flip-flop
83 // Linux 2.6? (otherwise assumes 2.4)
85 // 1 if sample delay is not an integer fraction of a second
86 smallint need_seconds;
92 #define first_proc_file proc_stat
93 proc_file proc_stat; // Must match the order of proc_name's!
94 proc_file proc_loadavg;
95 proc_file proc_net_dev;
96 proc_file proc_meminfo;
97 proc_file proc_diskstats;
98 proc_file proc_sys_fs_filenr;
100 #define G (*ptr_to_globals)
102 #define is26 (G.is26 )
103 #define need_seconds (G.need_seconds )
104 #define cur_outbuf (G.cur_outbuf )
106 #define proc_stat (G.proc_stat )
107 #define proc_loadavg (G.proc_loadavg )
108 #define proc_net_dev (G.proc_net_dev )
109 #define proc_meminfo (G.proc_meminfo )
110 #define proc_diskstats (G.proc_diskstats )
111 #define proc_sys_fs_filenr (G.proc_sys_fs_filenr)
112 #define outbuf bb_common_bufsiz1
113 #define INIT_G() do { \
114 setup_common_bufsiz(); \
115 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
116 cur_outbuf = outbuf; \
117 G.final_char = '\n'; \
118 G.deltanz = G.delta = 1000000; \
121 static inline void reset_outbuf(void)
126 static inline int outbuf_count(void)
128 return cur_outbuf - outbuf;
131 static void print_outbuf(void)
133 int sz = cur_outbuf - outbuf;
135 xwrite(STDOUT_FILENO, outbuf, sz);
140 static void put(const char *s)
142 char *p = cur_outbuf;
143 int sz = outbuf + COMMON_BUFSIZE - p;
144 while (*s && --sz >= 0)
149 static void put_c(char c)
151 if (cur_outbuf < outbuf + COMMON_BUFSIZE)
155 static void put_question_marks(int count)
161 static void readfile_z(proc_file *pf, const char* fname)
163 // open_read_close() will do two reads in order to be sure we are at EOF,
164 // and we don't need/want that.
172 buf = xmalloc(PROC_MIN_FILE_SIZE);
173 sz = PROC_MIN_FILE_SIZE;
176 fd = xopen(fname, O_RDONLY);
178 rdsz = read(fd, buf, sz-1);
181 if (rdsz == sz-1 && sz < PROC_MAX_FILE_SIZE) {
183 buf = xrealloc(buf, sz);
192 static const char* get_file(proc_file *pf)
194 if (pf->last_gen != gen) {
196 readfile_z(pf, proc_name[pf - &first_proc_file]);
201 static ullong read_after_slash(const char *p)
205 return strtoull(p+1, NULL, 10);
213 // Reads decimal values from line. Values start after key, for example:
214 // "cpu 649369 0 341297 4336769..." - key is "cpu" here.
215 // Values are stored in vec[].
216 // posbits is a bit lit of positions we are interested in.
217 // for example: 00100110 - we want 1st, 2nd and 5th value.
218 // posbits.bit0 encodes conversion type.
219 static int rdval(const char* p, const char* key, ullong *vec, long posbits)
229 while (*p == ' ' || *p == '\t') p++;
230 if (*p == '\n' || *p == '\0') break;
232 if (curpos & posbits) { // read this value
233 *vec++ = (posbits & 1) == conv_decimal ?
234 strtoull(p, NULL, 10) :
240 while (*p > ' ') // skip over the value
247 // Parses files with lines like "... ... ... 3/148 ...."
248 static int rdval_loadavg(const char* p, ullong *vec, long posbits)
251 result = rdval(p, "", vec, posbits | conv_slash);
255 // Parses /proc/diskstats
256 // 1 2 3 4 5 6(rd) 7 8 9 10(wr) 11 12 13 14
257 // 3 0 hda 51292 14441 841783 926052 25717 79650 843256 3029804 0 148459 3956933
258 // 3 1 hda1 0 0 0 0 <- ignore if only 4 fields
259 // Linux 3.0 (maybe earlier) started printing full stats for hda1 too.
260 // Had to add code which skips such devices.
261 static int rdval_diskstats(const char* p, ullong *vec)
264 unsigned devname_len = 0;
271 while (*p == ' ' || *p == '\t')
280 if (value_idx == 3) {
281 char *end = strchrnul(p, ' ');
282 /* If this a hda1-like device (same prefix as last one + digit)? */
283 if (devname_len && strncmp(devname, p, devname_len) == 0 && isdigit(p[devname_len])) {
285 goto skip_line; /* skip entire line */
287 /* It is not. Remember the name for future checks */
288 devname_len = end - p;
289 if (devname_len > sizeof(devname)-1)
290 devname_len = sizeof(devname)-1;
291 strncpy(devname, p, devname_len);
292 /* devname[devname_len] = '\0'; - not really needed */
295 if (value_idx == 6) {
296 // TODO: *sectorsize (don't know how to find out sectorsize)
297 vec[0] += strtoull(p, NULL, 10);
299 if (value_idx == 10) {
300 // TODO: *sectorsize (don't know how to find out sectorsize)
301 vec[1] += strtoull(p, NULL, 10);
303 while (*p != '\n' && *p != '\0')
307 while ((unsigned char)(*p) > ' ') // skip over value
313 static void scale(ullong ul)
317 /* see http://en.wikipedia.org/wiki/Tera */
318 smart_ulltoa4(ul, buf, " kmgtpezy")[0] = '\0';
324 struct s_stat *next; \
325 void (*collect)(struct a *s) FAST_FUNC; \
327 #define S_STAT_END(a) } a;
332 static void FAST_FUNC collect_literal(s_stat *s UNUSED_PARAM)
336 static s_stat* init_literal(void)
338 s_stat *s = xzalloc(sizeof(*s));
339 s->collect = collect_literal;
343 static s_stat* init_cr(const char *param UNUSED_PARAM)
349 // user nice system idle iowait irq softirq (last 3 only in 2.6)
350 //cpu 649369 0 341297 4336769 11640 7122 1183
351 //cpuN 649369 0 341297 4336769 11640 7122 1183
352 enum { CPU_FIELDCNT = 7 };
354 ullong old[CPU_FIELDCNT];
359 static void FAST_FUNC collect_cpu(cpu_stat *s)
361 ullong data[CPU_FIELDCNT] = { 0, 0, 0, 0, 0, 0, 0 };
362 unsigned frac[CPU_FIELDCNT] = { 0, 0, 0, 0, 0, 0, 0 };
365 int bar_sz = s->bar_sz;
369 if (rdval(get_file(&proc_stat), "cpu ", data, 0
378 put_question_marks(bar_sz);
382 for (i = 0; i < CPU_FIELDCNT; i++) {
383 ullong old = s->old[i];
384 if (data[i] < old) old = data[i]; //sanitize
386 all += (data[i] -= old);
390 for (i = 0; i < CPU_FIELDCNT; i++) {
391 ullong t = bar_sz * data[i];
392 norm_all += data[i] = t / all;
396 while (norm_all < bar_sz) {
397 unsigned max = frac[0];
399 for (i = 1; i < CPU_FIELDCNT; i++) {
400 if (frac[i] > max) max = frac[i], pos = i;
402 frac[pos] = 0; //avoid bumping up same value twice
407 memset(bar, '.', bar_sz);
408 memset(bar, 'S', data[2]); bar += data[2]; //sys
409 memset(bar, 'U', data[0]); bar += data[0]; //usr
410 memset(bar, 'N', data[1]); bar += data[1]; //nice
411 memset(bar, 'D', data[4]); bar += data[4]; //iowait
412 memset(bar, 'I', data[5]); bar += data[5]; //irq
413 memset(bar, 'i', data[6]); bar += data[6]; //softirq
415 memset(bar, '?', bar_sz);
420 static s_stat* init_cpu(const char *param)
424 sz = strtoul(param, NULL, 0); /* param can be "" */
425 if (sz < 10) sz = 10;
426 if (sz > 1000) sz = 1000;
427 s = xzalloc(sizeof(*s) + sz);
428 /*s->bar[sz] = '\0'; - xzalloc did it */
430 s->collect = collect_cpu;
439 static void FAST_FUNC collect_int(int_stat *s)
444 if (rdval(get_file(&proc_stat), "intr", data, 1 << s->no)) {
445 put_question_marks(4);
450 if (data[0] < old) old = data[0]; //sanitize
452 scale(data[0] - old);
455 static s_stat* init_int(const char *param)
457 int_stat *s = xzalloc(sizeof(*s));
458 s->collect = collect_int;
459 if (param[0] == '\0') {
462 int n = xatoi_positive(param);
472 static void FAST_FUNC collect_ctx(ctx_stat *s)
477 if (rdval(get_file(&proc_stat), "ctxt", data, 1 << 1)) {
478 put_question_marks(4);
483 if (data[0] < old) old = data[0]; //sanitize
485 scale(data[0] - old);
488 static s_stat* init_ctx(const char *param UNUSED_PARAM)
490 ctx_stat *s = xzalloc(sizeof(*s));
491 s->collect = collect_ctx;
500 static void FAST_FUNC collect_blk(blk_stat *s)
506 i = rdval_diskstats(get_file(&proc_diskstats), data);
508 i = rdval(get_file(&proc_stat), s->lookfor, data, 0
512 // Linux 2.4 reports bio in Kbytes, convert to sectors:
517 put_question_marks(9);
521 for (i=0; i<2; i++) {
522 ullong old = s->old[i];
523 if (data[i] < old) old = data[i]; //sanitize
527 scale(data[0]*512); // TODO: *sectorsize
532 static s_stat* init_blk(const char *param UNUSED_PARAM)
534 blk_stat *s = xzalloc(sizeof(*s));
535 s->collect = collect_blk;
542 S_STAT_END(fork_stat)
544 static void FAST_FUNC collect_thread_nr(fork_stat *s UNUSED_PARAM)
548 if (rdval_loadavg(get_file(&proc_loadavg), data, 1 << 4)) {
549 put_question_marks(4);
555 static void FAST_FUNC collect_fork(fork_stat *s)
560 if (rdval(get_file(&proc_stat), "processes", data, 1 << 1)) {
561 put_question_marks(4);
566 if (data[0] < old) old = data[0]; //sanitize
568 scale(data[0] - old);
571 static s_stat* init_fork(const char *param)
573 fork_stat *s = xzalloc(sizeof(*s));
575 s->collect = collect_thread_nr;
577 s->collect = collect_fork;
588 static void FAST_FUNC collect_if(if_stat *s)
593 if (rdval(get_file(&proc_net_dev), s->device_colon, data, 0
599 put_question_marks(10);
603 for (i=0; i<4; i++) {
604 ullong old = s->old[i];
605 if (data[i] < old) old = data[i]; //sanitize
609 put_c(data[1] ? '*' : ' ');
611 put_c(data[3] ? '*' : ' ');
615 static s_stat* init_if(const char *device)
617 if_stat *s = xzalloc(sizeof(*s));
619 if (!device || !device[0])
621 s->collect = collect_if;
624 s->device_colon = xasprintf("%s:", device);
632 // "Memory" value should not include any caches.
633 // IOW: neither "ls -laR /" nor heavy read/write activity
634 // should affect it. We'd like to also include any
635 // long-term allocated kernel-side mem, but it is hard
636 // to figure out. For now, bufs, cached & slab are
637 // counted as "free" memory
639 //MemTotal: 773280 kB
640 //MemFree: 25912 kB - genuinely free
641 //Buffers: 320672 kB - cache
642 //Cached: 146396 kB - cache
645 //Inactive: 356892 kB
648 //LowTotal: 773280 kB
650 //SwapTotal: 131064 kB
651 //SwapFree: 131064 kB
655 //Slab: 200668 kB - takes 7 Mb on my box fresh after boot,
656 // but includes dentries and inodes
657 // (== can take arbitrary amount of mem)
658 //CommitLimit: 517704 kB
659 //Committed_AS: 236776 kB
660 //PageTables: 1248 kB
661 //VmallocTotal: 516052 kB
662 //VmallocUsed: 3852 kB
663 //VmallocChunk: 512096 kB
666 //Hugepagesize: 4096 kB
667 static void FAST_FUNC collect_mem(mem_stat *s)
675 if (rdval(get_file(&proc_meminfo), "MemTotal:", &m_total, 1 << 1)) {
676 put_question_marks(4);
680 scale(m_total << 10);
684 if (rdval(proc_meminfo.file, "MemFree:", &m_free , 1 << 1)
685 || rdval(proc_meminfo.file, "Buffers:", &m_bufs , 1 << 1)
686 || rdval(proc_meminfo.file, "Cached:", &m_cached, 1 << 1)
687 || rdval(proc_meminfo.file, "Slab:", &m_slab , 1 << 1)
689 put_question_marks(4);
693 m_free += m_bufs + m_cached + m_slab;
696 scale(m_free << 10); break;
698 scale((m_total - m_free) << 10); break;
702 static s_stat* init_mem(const char *param)
704 mem_stat *s = xzalloc(sizeof(*s));
705 s->collect = collect_mem;
713 static void FAST_FUNC collect_swp(swp_stat *s UNUSED_PARAM)
717 if (rdval(get_file(&proc_meminfo), "SwapTotal:", s_total, 1 << 1)
718 || rdval(proc_meminfo.file, "SwapFree:" , s_free, 1 << 1)
720 put_question_marks(4);
723 scale((s_total[0]-s_free[0]) << 10);
726 static s_stat* init_swp(const char *param UNUSED_PARAM)
728 swp_stat *s = xzalloc(sizeof(*s));
729 s->collect = collect_swp;
736 static void FAST_FUNC collect_fd(fd_stat *s UNUSED_PARAM)
740 if (rdval(get_file(&proc_sys_fs_filenr), "", data, 0
744 put_question_marks(4);
748 scale(data[0] - data[1]);
751 static s_stat* init_fd(const char *param UNUSED_PARAM)
753 fd_stat *s = xzalloc(sizeof(*s));
754 s->collect = collect_fd;
761 S_STAT_END(time_stat)
763 static void FAST_FUNC collect_time(time_stat *s)
765 char buf[sizeof("12:34:56.123456")];
767 unsigned us = tv.tv_usec + s->scale/2;
768 time_t t = tv.tv_sec;
776 sprintf(buf, "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);
778 sprintf(buf+8, ".%0*d", s->prec, us / s->scale);
782 static s_stat* init_time(const char *param)
785 time_stat *s = xzalloc(sizeof(*s));
787 s->collect = collect_time;
788 prec = param[0] - '0';
789 if (prec < 0) prec = 0;
790 else if (prec > 6) prec = 6;
798 static void FAST_FUNC collect_info(s_stat *s)
808 typedef s_stat* init_func(const char *param);
810 static const char options[] ALIGN1 = "ncmsfixptbr";
811 static init_func *const init_functions[] = {
825 int nmeter_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
826 int nmeter_main(int argc UNUSED_PARAM, char **argv)
829 s_stat *first = NULL;
839 if (open_read_close("version", buf, sizeof(buf)-1) > 0) {
840 buf[sizeof(buf)-1] = '\0';
841 is26 = (strstr(buf, " 2.4.") == NULL);
844 if (getopt32(argv, "d:", &opt_d)) {
845 G.delta = xatoi(opt_d) * 1000;
846 G.deltanz = G.delta > 0 ? G.delta : 1;
847 need_seconds = (1000000 % G.deltanz) != 0;
854 // Can use argv[0] directly, but this will mess up
855 // parameters as seen by e.g. ps. Making a copy...
856 cur = xstrdup(argv[0]);
861 cur = strchr(cur, '%');
864 if (cur[1] == '%') { // %%
865 overlapping_strcpy(cur, cur + 1);
869 *cur++ = '\0'; // overwrite %
871 // format: %[foptstring]
873 p = strchr(options, cur[0]);
875 while (cur[0] != ']') {
880 *cur++ = '\0'; // overwrite [
884 while (cur[0] >= '0' && cur[0] <= '9')
888 p = strchr(options, cur[0]);
889 *cur++ = '\0'; // overwrite format char
893 s = init_functions[p-options](param);
896 /*s->next = NULL; - all initXXX funcs use xzalloc */
903 // %r option. remove it from string
904 overlapping_strcpy(prev + strlen(prev), cur);
911 /*s->next = NULL; - all initXXX funcs use xzalloc */
919 // Generate first samples but do not print them, they're bogus
923 gettimeofday(&tv, NULL);
924 usleep(G.delta > 1000000 ? 1000000 : G.delta - tv.tv_usec % G.deltanz);
928 gettimeofday(&tv, NULL);
933 // Negative delta -> no usleep at all
934 // This will hog the CPU but you can have REALLY GOOD
935 // time resolution ;)
936 // TODO: detect and avoid useless updates
937 // (like: nothing happens except time)
940 // can be commented out, will sacrifice sleep time precision a bit
941 gettimeofday(&tv, NULL);
943 rem = G.delta - ((ullong)tv.tv_sec*1000000 + tv.tv_usec) % G.deltanz;
945 rem = G.delta - (unsigned)tv.tv_usec % G.deltanz;
946 // Sometimes kernel wakes us up just a tiny bit earlier than asked
947 // Do not go to very short sleep in this case
948 if (rem < (unsigned)G.delta / 128) {