1 /* vi: set sw=4 ts=4: */
3 * A tiny 'top' utility.
5 * This is written specifically for the linux /proc/<PID>/stat(m)
8 * This reads the PIDs of all processes and their status and shows
9 * the status of processes (first ones that fit to screen) at given
13 * - At startup this changes to /proc, all the reads are then
16 * (C) Eero Tamminen <oak at welho dot com>
18 * Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
21 /* Original code Copyrights */
23 * Copyright (c) 1992 Branko Lankester
24 * Copyright (c) 1992 Roger Binns
25 * Copyright (C) 1994-1996 Charles L. Blake.
26 * Copyright (C) 1992-1998 Michael K. Johnson
27 * May be distributed under the conditions of the
28 * GNU Library General Public License
33 typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
35 static procps_status_t *top; /* Hehe */
37 #define OPT_BATCH_MODE (option_mask32 & 0x4)
39 #ifdef CONFIG_FEATURE_USE_TERMIOS
40 static int pid_sort(procps_status_t *P, procps_status_t *Q)
42 return (Q->pid - P->pid);
46 static int mem_sort(procps_status_t *P, procps_status_t *Q)
48 return (int)(Q->rss - P->rss);
51 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
54 static cmp_t sort_function[sort_depth];
56 static int pcpu_sort(procps_status_t *P, procps_status_t *Q)
58 return (Q->pcpu - P->pcpu);
61 static int time_sort(procps_status_t *P, procps_status_t *Q)
63 return (int)((Q->stime + Q->utime) - (P->stime + P->utime));
66 static int mult_lvl_cmp(void* a, void* b) {
69 for (i = 0; i < sort_depth; i++) {
70 cmp_val = (*sort_function[i])(a, b);
77 /* This structure stores some critical information from one frame to
78 the next. Mostly used for sorting. */
85 * Calculates percent cpu usage for each task.
88 static struct save_hist *prev_hist;
89 static int prev_hist_count;
90 /* static int hist_iterations; */
93 static unsigned total_pcpu;
94 /* static unsigned long total_rss; */
97 unsigned long long usr,nic,sys,idle,iowait,irq,softirq,steal;
98 unsigned long long total;
99 unsigned long long busy;
101 static struct jiffy_counts jif, prev_jif;
103 static void get_jiffy_counts(void)
105 FILE* fp = xfopen("stat", "r");
107 if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
108 &jif.usr,&jif.nic,&jif.sys,&jif.idle,
109 &jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
110 bb_error_msg_and_die("failed to read /proc/stat");
113 jif.total = jif.usr + jif.nic + jif.sys + jif.idle
114 + jif.iowait + jif.irq + jif.softirq + jif.steal;
115 /* procps 2.x does not count iowait as busy time */
116 jif.busy = jif.total - jif.idle - jif.iowait;
119 static void do_stats(void)
121 procps_status_t *cur;
122 int pid, total_time, i, last_i, n;
123 struct save_hist *new_hist;
128 new_hist = xmalloc(sizeof(struct save_hist)*ntop);
130 * Make a pass through the data to get stats.
132 /* hist_iterations = 0; */
134 for (n = 0; n < ntop; n++) {
138 * Calculate time in cur process. Time is sum of user time
142 total_time = cur->stime + cur->utime;
143 new_hist[n].ticks = total_time;
144 new_hist[n].pid = pid;
146 /* find matching entry from previous pass */
148 /* do not start at index 0, continue at last used one
149 * (brought hist_iterations from ~14000 down to 172) */
151 if (prev_hist_count) do {
152 if (prev_hist[i].pid == pid) {
153 cur->pcpu = total_time - prev_hist[i].ticks;
156 i = (i+1) % prev_hist_count;
157 /* hist_iterations++; */
158 } while (i != last_i);
159 total_pcpu += cur->pcpu;
160 /* total_rss += cur->rss; */
164 * Save cur frame's information.
167 prev_hist = new_hist;
168 prev_hist_count = ntop;
171 static cmp_t sort_function;
172 #endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
174 /* display generic info (meminfo / loadavg) */
175 static unsigned long display_generic(int scr_width)
181 unsigned long total, used, mfree, shared, buffers, cached;
182 unsigned int needs_conversion = 1;
184 /* read memory info */
185 fp = xfopen("meminfo", "r");
188 * Old kernels (such as 2.4.x) had a nice summary of memory info that
189 * we could parse, however this is gone entirely in 2.6. Try parsing
190 * the old way first, and if that fails, parse each field manually.
192 * First, we read in the first line. Old kernels will have bogus
193 * strings we don't care about, whereas new kernels will start right
197 if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
198 fgets(buf, sizeof(buf), fp); /* skip first line */
200 fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
201 &total, &used, &mfree, &shared, &buffers, &cached);
204 * Revert to manual parsing, which incidentally already has the
205 * sizes in kilobytes. This should be safe for both 2.4 and
208 needs_conversion = 0;
210 fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
213 * MemShared: is no longer present in 2.6. Report this as 0,
214 * to maintain consistent behavior with normal procps.
216 if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
219 fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
220 fscanf(fp, "Cached: %lu %s\n", &cached, buf);
222 used = total - mfree;
226 /* read load average as a string */
227 fp = xfopen("loadavg", "r");
229 fgets(buf, sizeof(buf), fp);
230 end = strchr(buf, ' ');
231 if (end) end = strchr(end+1, ' ');
232 if (end) end = strchr(end+1, ' ');
233 if (end) *end = '\0';
236 if (needs_conversion) {
237 /* convert to kilobytes */
246 /* output memory info and load average */
247 /* clear screen & go to top */
248 if (scr_width > sizeof(scrbuf))
249 scr_width = sizeof(scrbuf);
250 snprintf(scrbuf, scr_width,
251 "Mem: %ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached",
252 used, mfree, shared, buffers, cached);
254 printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
256 snprintf(scrbuf, scr_width,
257 "Load average: %s", buf);
258 printf("%s\n", scrbuf);
264 /* display process statuses */
265 static void display_status(int count, int scr_width)
268 bits_per_int = sizeof(int)*8
271 procps_status_t *s = top;
273 unsigned long total_memory = display_generic(scr_width); /* or use total_rss? */
274 unsigned pmem_shift, pmem_scale;
276 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
277 unsigned pcpu_shift, pcpu_scale;
279 /* what info of the processes is shown */
280 printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
281 " PID USER STATUS RSS PPID %CPU %MEM COMMAND");
283 sizeof( " PID USER STATUS RSS PPID %CPU %MEM C")
285 printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
286 " PID USER STATUS RSS PPID %MEM COMMAND");
288 sizeof( " PID USER STATUS RSS PPID %MEM C")
292 * MEM% = s->rss/MemTotal
294 pmem_shift = bits_per_int-11;
295 pmem_scale = 1000*(1U<<(bits_per_int-11)) / total_memory;
296 /* s->rss is in kb. we want (s->rss * pmem_scale) to never overflow */
297 while (pmem_scale >= 512) {
301 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
303 * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
304 * (pcpu is delta of sys+user time between samples)
306 /* (jif.xxx - prev_jif.xxx) and s->pcpu are
307 * in 0..~64000 range (HZ*update_interval).
308 * we assume that unsigned is at least 32-bit.
311 pcpu_scale = (1000*64*(uint16_t)(jif.busy-prev_jif.busy) ? : 1);
312 while (pcpu_scale < (1U<<(bits_per_int-2))) {
316 pcpu_scale /= ( (uint16_t)(jif.total-prev_jif.total)*total_pcpu ? : 1);
317 /* we want (s->pcpu * pcpu_scale) to never overflow */
318 while (pcpu_scale >= 1024) {
322 /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
324 if (OPT_BATCH_MODE) count--;
325 while (count-- > 0) {
326 div_t pmem = div((s->rss*pmem_scale) >> pmem_shift, 10);
327 int col = scr_width+1;
328 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
330 if (s->rss >= 100*1024)
331 sprintf(rss_str_buf, "%6ldM", s->rss/1024);
333 sprintf(rss_str_buf, "%7ld", s->rss);
334 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);)
335 col -= printf("\n%5d %-8s %s %s%6d%3u.%c" \
336 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c") " ",
337 s->pid, s->user, s->state, rss_str_buf, s->ppid,
338 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
339 pmem.quot, '0'+pmem.rem);
341 printf("%.*s", col, s->short_cmd);
342 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
343 jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
346 /* printf(" %d", hist_iterations); */
347 putchar(OPT_BATCH_MODE ? '\n' : '\r');
351 static void clearmems(void)
358 #ifdef CONFIG_FEATURE_USE_TERMIOS
363 static struct termios initial_settings;
365 static void reset_term(void)
367 tcsetattr(0, TCSANOW, (void *) &initial_settings);
368 #ifdef CONFIG_FEATURE_CLEAN_UP
370 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
373 #endif /* CONFIG_FEATURE_CLEAN_UP */
376 static void sig_catcher(int sig ATTRIBUTE_UNUSED)
381 #endif /* CONFIG_FEATURE_USE_TERMIOS */
384 int top_main(int argc, char **argv)
386 int count, lines, col;
387 unsigned interval = 5; /* default update rate is 5 seconds */
388 unsigned iterations = UINT_MAX; /* 2^32 iterations by default :) */
389 char *sinterval, *siterations;
390 #ifdef CONFIG_FEATURE_USE_TERMIOS
391 struct termios new_settings;
395 #endif /* CONFIG_FEATURE_USE_TERMIOS */
397 /* do normal option parsing */
399 opt_complementary = "-";
400 getopt32(argc, argv, "d:n:b",
401 &sinterval, &siterations);
402 if (option_mask32 & 0x1) interval = xatou(sinterval); // -d
403 if (option_mask32 & 0x2) iterations = xatou(siterations); // -n
404 //if (option_mask32 & 0x4) // -b
406 /* change to /proc */
408 #ifdef CONFIG_FEATURE_USE_TERMIOS
409 tcgetattr(0, (void *) &initial_settings);
410 memcpy(&new_settings, &initial_settings, sizeof(struct termios));
411 /* unbuffered input, turn off echo */
412 new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
414 signal(SIGTERM, sig_catcher);
415 signal(SIGINT, sig_catcher);
416 tcsetattr(0, TCSANOW, (void *) &new_settings);
418 #endif /* CONFIG_FEATURE_USE_TERMIOS */
420 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
421 sort_function[0] = pcpu_sort;
422 sort_function[1] = mem_sort;
423 sort_function[2] = time_sort;
425 sort_function = mem_sort;
426 #endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
431 /* Default to 25 lines - 5 lines for status */
434 #ifdef CONFIG_FEATURE_USE_TERMIOS
435 get_terminal_width_height(0, &col, &lines);
436 if (lines < 5 || col < MIN_WIDTH) {
441 #endif /* CONFIG_FEATURE_USE_TERMIOS */
443 /* read process IDs & status for all the processes */
444 while ((p = procps_scan(0)) != 0) {
447 top = xrealloc(top, (++ntop)*sizeof(procps_status_t));
448 memcpy(top + n, p, sizeof(procps_status_t));
451 bb_error_msg_and_die("can't find process info in /proc");
453 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
454 if (!prev_hist_count) {
461 qsort(top, ntop, sizeof(procps_status_t), (void*)mult_lvl_cmp);
463 qsort(top, ntop, sizeof(procps_status_t), (void*)sort_function);
464 #endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
469 /* show status for each of the processes */
470 display_status(count, col);
471 #ifdef CONFIG_FEATURE_USE_TERMIOS
472 tv.tv_sec = interval;
476 select(1, &readfds, NULL, NULL, &tv);
477 if (FD_ISSET(0, &readfds)) {
478 if (read(0, &c, 1) <= 0) { /* signal */
481 if (c == 'q' || c == initial_settings.c_cc[VINTR])
484 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
485 sort_function[0] = mem_sort;
486 sort_function[1] = pcpu_sort;
487 sort_function[2] = time_sort;
489 sort_function = mem_sort;
492 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
494 sort_function[0] = pcpu_sort;
495 sort_function[1] = mem_sort;
496 sort_function[2] = time_sort;
499 sort_function[0] = time_sort;
500 sort_function[1] = mem_sort;
501 sort_function[2] = pcpu_sort;
505 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
506 sort_function[0] = pid_sort;
508 sort_function = pid_sort;
516 #endif /* CONFIG_FEATURE_USE_TERMIOS */
519 if (ENABLE_FEATURE_CLEAN_UP)