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"
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)"
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})
57 typedef unsigned long long ullong;
59 enum { /* Preferably use powers of 2 */
60 PROC_MIN_FILE_SIZE = 256,
61 PROC_MAX_FILE_SIZE = 16 * 1024,
64 typedef struct proc_file {
70 static const char *const proc_name[] = {
71 "stat", // Must match the order of proc_file's!
80 // Sample generation flip-flop
82 // Linux 2.6? (otherwise assumes 2.4)
84 // 1 if sample delay is not an integer fraction of a second
85 smallint need_seconds;
87 const char *final_str;
91 #define first_proc_file proc_stat
92 proc_file proc_stat; // Must match the order of proc_name's!
93 proc_file proc_loadavg;
94 proc_file proc_net_dev;
95 proc_file proc_meminfo;
96 proc_file proc_diskstats;
97 proc_file proc_sys_fs_filenr;
99 #define G (*ptr_to_globals)
101 #define is26 (G.is26 )
102 #define need_seconds (G.need_seconds )
103 #define cur_outbuf (G.cur_outbuf )
104 #define final_str (G.final_str )
105 #define delta (G.delta )
106 #define deltanz (G.deltanz )
108 #define proc_stat (G.proc_stat )
109 #define proc_loadavg (G.proc_loadavg )
110 #define proc_net_dev (G.proc_net_dev )
111 #define proc_meminfo (G.proc_meminfo )
112 #define proc_diskstats (G.proc_diskstats )
113 #define proc_sys_fs_filenr (G.proc_sys_fs_filenr)
114 #define INIT_G() do { \
115 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
116 cur_outbuf = outbuf; \
118 deltanz = delta = 1000000; \
121 // We depend on this being a char[], not char* - we take sizeof() of it
122 #define outbuf bb_common_bufsiz1
124 static inline void reset_outbuf(void)
129 static inline int outbuf_count(void)
131 return cur_outbuf - outbuf;
134 static void print_outbuf(void)
136 int sz = cur_outbuf - outbuf;
138 xwrite(STDOUT_FILENO, outbuf, sz);
143 static void put(const char *s)
146 if (sz > outbuf + sizeof(outbuf) - cur_outbuf)
147 sz = outbuf + sizeof(outbuf) - cur_outbuf;
148 memcpy(cur_outbuf, s, sz);
152 static void put_c(char c)
154 if (cur_outbuf < outbuf + sizeof(outbuf))
158 static void put_question_marks(int count)
164 static void readfile_z(proc_file *pf, const char* fname)
166 // open_read_close() will do two reads in order to be sure we are at EOF,
167 // and we don't need/want that.
175 buf = xmalloc(PROC_MIN_FILE_SIZE);
176 sz = PROC_MIN_FILE_SIZE;
179 fd = xopen(fname, O_RDONLY);
181 rdsz = read(fd, buf, sz-1);
184 if (rdsz == sz-1 && sz < PROC_MAX_FILE_SIZE) {
186 buf = xrealloc(buf, sz);
195 static const char* get_file(proc_file *pf)
197 if (pf->last_gen != gen) {
199 readfile_z(pf, proc_name[pf - &first_proc_file]);
204 static ullong read_after_slash(const char *p)
208 return strtoull(p+1, NULL, 10);
211 enum conv_type { conv_decimal, conv_slash };
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[]. arg_ptr has list of positions
216 // we are interested in: for example: 1,2,5 - we want 1st, 2nd and 5th value.
217 static int vrdval(const char* p, const char* key,
218 enum conv_type conv, ullong *vec, va_list arg_ptr)
228 indexnext = va_arg(arg_ptr, int);
230 while (*p == ' ' || *p == '\t') p++;
231 if (*p == '\n' || *p == '\0') break;
233 if (indexline == indexnext) { // read this value
234 *vec++ = conv==conv_decimal ?
235 strtoull(p, NULL, 10) :
237 indexnext = va_arg(arg_ptr, int);
239 while (*p > ' ') p++; // skip over value
245 // Parses files with lines like "cpu0 21727 0 15718 1813856 9461 10485 0 0":
246 // rdval(file_contents, "string_to_find", result_vector, value#, value#...)
247 // value# start with 1
248 static int rdval(const char* p, const char* key, ullong *vec, ...)
253 va_start(arg_ptr, vec);
254 result = vrdval(p, key, conv_decimal, vec, arg_ptr);
260 // Parses files with lines like "... ... ... 3/148 ...."
261 static int rdval_loadavg(const char* p, ullong *vec, ...)
266 va_start(arg_ptr, vec);
267 result = vrdval(p, "", conv_slash, vec, arg_ptr);
273 // Parses /proc/diskstats
274 // 1 2 3 4 5 6(rd) 7 8 9 10(wr) 11 12 13 14
275 // 3 0 hda 51292 14441 841783 926052 25717 79650 843256 3029804 0 148459 3956933
276 // 3 1 hda1 0 0 0 0 <- ignore if only 4 fields
277 // Linux 3.0 (maybe earlier) started printing full stats for hda1 too.
278 // Had to add code which skips such devices.
279 static int rdval_diskstats(const char* p, ullong *vec)
282 unsigned devname_len = 0;
289 while (*p == ' ' || *p == '\t')
298 if (value_idx == 3) {
299 char *end = strchrnul(p, ' ');
300 /* If this a hda1-like device (same prefix as last one + digit)? */
301 if (devname_len && strncmp(devname, p, devname_len) == 0 && isdigit(p[devname_len])) {
303 goto skip_line; /* skip entire line */
305 /* It is not. Remember the name for future checks */
306 devname_len = end - p;
307 if (devname_len > sizeof(devname)-1)
308 devname_len = sizeof(devname)-1;
309 strncpy(devname, p, devname_len);
310 /* devname[devname_len] = '\0'; - not really needed */
313 if (value_idx == 6) {
314 // TODO: *sectorsize (don't know how to find out sectorsize)
315 vec[0] += strtoull(p, NULL, 10);
317 if (value_idx == 10) {
318 // TODO: *sectorsize (don't know how to find out sectorsize)
319 vec[1] += strtoull(p, NULL, 10);
321 while (*p != '\n' && *p != '\0')
325 while ((unsigned char)(*p) > ' ') // skip over value
331 static void scale(ullong ul)
335 /* see http://en.wikipedia.org/wiki/Tera */
336 smart_ulltoa4(ul, buf, " kmgtpezy")[0] = '\0';
343 struct s_stat *next; \
344 void (*collect)(struct a *s) FAST_FUNC; \
346 #define S_STAT_END(a) } a;
351 static void FAST_FUNC collect_literal(s_stat *s UNUSED_PARAM)
355 static s_stat* init_literal(void)
357 s_stat *s = xzalloc(sizeof(*s));
358 s->collect = collect_literal;
362 static s_stat* init_delay(const char *param)
364 delta = strtoul(param, NULL, 0) * 1000; /* param can be "" */
365 deltanz = delta > 0 ? delta : 1;
366 need_seconds = (1000000%deltanz) != 0;
370 static s_stat* init_cr(const char *param UNUSED_PARAM)
377 // user nice system idle iowait irq softirq (last 3 only in 2.6)
378 //cpu 649369 0 341297 4336769 11640 7122 1183
379 //cpuN 649369 0 341297 4336769 11640 7122 1183
380 enum { CPU_FIELDCNT = 7 };
382 ullong old[CPU_FIELDCNT];
388 static void FAST_FUNC collect_cpu(cpu_stat *s)
390 ullong data[CPU_FIELDCNT] = { 0, 0, 0, 0, 0, 0, 0 };
391 unsigned frac[CPU_FIELDCNT] = { 0, 0, 0, 0, 0, 0, 0 };
394 int bar_sz = s->bar_sz;
398 if (rdval(get_file(&proc_stat), "cpu ", data, 1, 2, 3, 4, 5, 6, 7)) {
399 put_question_marks(bar_sz);
403 for (i = 0; i < CPU_FIELDCNT; i++) {
404 ullong old = s->old[i];
405 if (data[i] < old) old = data[i]; //sanitize
407 all += (data[i] -= old);
411 for (i = 0; i < CPU_FIELDCNT; i++) {
412 ullong t = bar_sz * data[i];
413 norm_all += data[i] = t / all;
417 while (norm_all < bar_sz) {
418 unsigned max = frac[0];
420 for (i = 1; i < CPU_FIELDCNT; i++) {
421 if (frac[i] > max) max = frac[i], pos = i;
423 frac[pos] = 0; //avoid bumping up same value twice
428 memset(bar, '.', bar_sz);
429 memset(bar, 'S', data[2]); bar += data[2]; //sys
430 memset(bar, 'U', data[0]); bar += data[0]; //usr
431 memset(bar, 'N', data[1]); bar += data[1]; //nice
432 memset(bar, 'D', data[4]); bar += data[4]; //iowait
433 memset(bar, 'I', data[5]); bar += data[5]; //irq
434 memset(bar, 'i', data[6]); bar += data[6]; //softirq
436 memset(bar, '?', bar_sz);
442 static s_stat* init_cpu(const char *param)
445 cpu_stat *s = xzalloc(sizeof(*s));
446 s->collect = collect_cpu;
447 sz = strtoul(param, NULL, 0); /* param can be "" */
448 if (sz < 10) sz = 10;
449 if (sz > 1000) sz = 1000;
450 s->bar = xzalloc(sz+1);
451 /*s->bar[sz] = '\0'; - xzalloc did it */
462 static void FAST_FUNC collect_int(int_stat *s)
467 if (rdval(get_file(&proc_stat), "intr", data, s->no)) {
468 put_question_marks(4);
473 if (data[0] < old) old = data[0]; //sanitize
475 scale(data[0] - old);
478 static s_stat* init_int(const char *param)
480 int_stat *s = xzalloc(sizeof(*s));
481 s->collect = collect_int;
482 if (param[0] == '\0') {
485 int n = xatoi_positive(param);
496 static void FAST_FUNC collect_ctx(ctx_stat *s)
501 if (rdval(get_file(&proc_stat), "ctxt", data, 1)) {
502 put_question_marks(4);
507 if (data[0] < old) old = data[0]; //sanitize
509 scale(data[0] - old);
512 static s_stat* init_ctx(const char *param UNUSED_PARAM)
514 ctx_stat *s = xzalloc(sizeof(*s));
515 s->collect = collect_ctx;
525 static void FAST_FUNC collect_blk(blk_stat *s)
531 i = rdval_diskstats(get_file(&proc_diskstats), data);
533 i = rdval(get_file(&proc_stat), s->lookfor, data, 1, 2);
534 // Linux 2.4 reports bio in Kbytes, convert to sectors:
539 put_question_marks(9);
543 for (i=0; i<2; i++) {
544 ullong old = s->old[i];
545 if (data[i] < old) old = data[i]; //sanitize
549 scale(data[0]*512); // TODO: *sectorsize
554 static s_stat* init_blk(const char *param UNUSED_PARAM)
556 blk_stat *s = xzalloc(sizeof(*s));
557 s->collect = collect_blk;
565 S_STAT_END(fork_stat)
567 static void FAST_FUNC collect_thread_nr(fork_stat *s UNUSED_PARAM)
571 if (rdval_loadavg(get_file(&proc_loadavg), data, 4)) {
572 put_question_marks(4);
578 static void FAST_FUNC collect_fork(fork_stat *s)
583 if (rdval(get_file(&proc_stat), "processes", data, 1)) {
584 put_question_marks(4);
589 if (data[0] < old) old = data[0]; //sanitize
591 scale(data[0] - old);
594 static s_stat* init_fork(const char *param)
596 fork_stat *s = xzalloc(sizeof(*s));
598 s->collect = collect_thread_nr;
600 s->collect = collect_fork;
612 static void FAST_FUNC collect_if(if_stat *s)
617 if (rdval(get_file(&proc_net_dev), s->device_colon, data, 1, 3, 9, 11)) {
618 put_question_marks(10);
622 for (i=0; i<4; i++) {
623 ullong old = s->old[i];
624 if (data[i] < old) old = data[i]; //sanitize
628 put_c(data[1] ? '*' : ' ');
630 put_c(data[3] ? '*' : ' ');
634 static s_stat* init_if(const char *device)
636 if_stat *s = xzalloc(sizeof(*s));
638 if (!device || !device[0])
640 s->collect = collect_if;
643 s->device_colon = xasprintf("%s:", device);
652 // "Memory" value should not include any caches.
653 // IOW: neither "ls -laR /" nor heavy read/write activity
654 // should affect it. We'd like to also include any
655 // long-term allocated kernel-side mem, but it is hard
656 // to figure out. For now, bufs, cached & slab are
657 // counted as "free" memory
659 //MemTotal: 773280 kB
660 //MemFree: 25912 kB - genuinely free
661 //Buffers: 320672 kB - cache
662 //Cached: 146396 kB - cache
665 //Inactive: 356892 kB
668 //LowTotal: 773280 kB
670 //SwapTotal: 131064 kB
671 //SwapFree: 131064 kB
675 //Slab: 200668 kB - takes 7 Mb on my box fresh after boot,
676 // but includes dentries and inodes
677 // (== can take arbitrary amount of mem)
678 //CommitLimit: 517704 kB
679 //Committed_AS: 236776 kB
680 //PageTables: 1248 kB
681 //VmallocTotal: 516052 kB
682 //VmallocUsed: 3852 kB
683 //VmallocChunk: 512096 kB
686 //Hugepagesize: 4096 kB
687 static void FAST_FUNC collect_mem(mem_stat *s)
695 if (rdval(get_file(&proc_meminfo), "MemTotal:", &m_total, 1)) {
696 put_question_marks(4);
700 scale(m_total << 10);
704 if (rdval(proc_meminfo.file, "MemFree:", &m_free , 1)
705 || rdval(proc_meminfo.file, "Buffers:", &m_bufs , 1)
706 || rdval(proc_meminfo.file, "Cached:", &m_cached, 1)
707 || rdval(proc_meminfo.file, "Slab:", &m_slab , 1)
709 put_question_marks(4);
713 m_free += m_bufs + m_cached + m_slab;
716 scale(m_free << 10); break;
718 scale((m_total - m_free) << 10); break;
722 static s_stat* init_mem(const char *param)
724 mem_stat *s = xzalloc(sizeof(*s));
725 s->collect = collect_mem;
734 static void FAST_FUNC collect_swp(swp_stat *s UNUSED_PARAM)
738 if (rdval(get_file(&proc_meminfo), "SwapTotal:", s_total, 1)
739 || rdval(proc_meminfo.file, "SwapFree:" , s_free, 1)
741 put_question_marks(4);
744 scale((s_total[0]-s_free[0]) << 10);
747 static s_stat* init_swp(const char *param UNUSED_PARAM)
749 swp_stat *s = xzalloc(sizeof(*s));
750 s->collect = collect_swp;
758 static void FAST_FUNC collect_fd(fd_stat *s UNUSED_PARAM)
762 if (rdval(get_file(&proc_sys_fs_filenr), "", data, 1, 2)) {
763 put_question_marks(4);
767 scale(data[0] - data[1]);
770 static s_stat* init_fd(const char *param UNUSED_PARAM)
772 fd_stat *s = xzalloc(sizeof(*s));
773 s->collect = collect_fd;
781 S_STAT_END(time_stat)
783 static void FAST_FUNC collect_time(time_stat *s)
785 char buf[sizeof("12:34:56.123456")];
787 int us = tv.tv_usec + s->scale/2;
788 time_t t = tv.tv_sec;
796 sprintf(buf, "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);
798 sprintf(buf+8, ".%0*d", s->prec, us / s->scale);
802 static s_stat* init_time(const char *param)
805 time_stat *s = xzalloc(sizeof(*s));
807 s->collect = collect_time;
808 prec = param[0] - '0';
809 if (prec < 0) prec = 0;
810 else if (prec > 6) prec = 6;
818 static void FAST_FUNC collect_info(s_stat *s)
829 typedef s_stat* init_func(const char *param);
831 // Deprecated %NNNd is to be removed, -d MSEC supersedes it
832 static const char options[] ALIGN1 = "ncmsfixptbdr";
833 static init_func *const init_functions[] = {
848 int nmeter_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
849 int nmeter_main(int argc UNUSED_PARAM, char **argv)
852 s_stat *first = NULL;
862 if (open_read_close("version", buf, sizeof(buf)-1) > 0) {
863 buf[sizeof(buf)-1] = '\0';
864 is26 = (strstr(buf, " 2.4.") == NULL);
867 if (getopt32(argv, "d:", &opt_d))
874 // Can use argv[0] directly, but this will mess up
875 // parameters as seen by e.g. ps. Making a copy...
876 cur = xstrdup(argv[0]);
881 cur = strchr(cur, '%');
884 if (cur[1] == '%') { // %%
885 overlapping_strcpy(cur, cur + 1);
889 *cur++ = '\0'; // overwrite %
891 // format: %[foptstring]
893 p = strchr(options, cur[0]);
895 while (cur[0] != ']') {
900 *cur++ = '\0'; // overwrite [
904 while (cur[0] >= '0' && cur[0] <= '9')
908 p = strchr(options, cur[0]);
909 *cur++ = '\0'; // overwrite format char
913 s = init_functions[p-options](param);
916 /*s->next = NULL; - all initXXX funcs use xzalloc */
923 // %NNNNd or %r option. remove it from string
924 strcpy(prev + strlen(prev), cur);
931 /*s->next = NULL; - all initXXX funcs use xzalloc */
939 // Generate first samples but do not print them, they're bogus
943 gettimeofday(&tv, NULL);
944 usleep(delta > 1000000 ? 1000000 : delta - tv.tv_usec%deltanz);
948 gettimeofday(&tv, NULL);
953 // Negative delta -> no usleep at all
954 // This will hog the CPU but you can have REALLY GOOD
955 // time resolution ;)
956 // TODO: detect and avoid useless updates
957 // (like: nothing happens except time)
960 // can be commented out, will sacrifice sleep time precision a bit
961 gettimeofday(&tv, NULL);
963 rem = delta - ((ullong)tv.tv_sec*1000000 + tv.tv_usec) % deltanz;
965 rem = delta - tv.tv_usec%deltanz;
966 // Sometimes kernel wakes us up just a tiny bit earlier than asked
967 // Do not go to very short sleep in this case
968 if (rem < delta/128) {