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1/* vi: set sw=4 ts=4: */
2/*
3 * A tiny 'top' utility.
4 *
5 * This is written specifically for the linux /proc/<PID>/stat(m)
6 * files format.
7 *
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
10 * intervals.
11 *
12 * NOTES:
13 * - At startup this changes to /proc, all the reads are then
14 * relative to that.
15 *
16 * (C) Eero Tamminen <oak at welho dot com>
17 *
18 * Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
19 *
20 * Sept 2008: Vineet Gupta <vineet.gupta@arc.com>
21 * Added Support for reporting SMP Information
22 * - CPU where process was last seen running
23 * (to see effect of sched_setaffinity() etc)
24 * - CPU time split (idle/IO/wait etc) per CPU
25 *
26 * Copyright (c) 1992 Branko Lankester
27 * Copyright (c) 1992 Roger Binns
28 * Copyright (C) 1994-1996 Charles L. Blake.
29 * Copyright (C) 1992-1998 Michael K. Johnson
30 *
31 * Licensed under GPLv2, see file LICENSE in this source tree.
32 */
33/* How to snapshot /proc for debugging top problems:
34 * for f in /proc/[0-9]*""/stat; do
35 * n=${f#/proc/}
36 * n=${n%/stat}_stat
37 * cp $f $n
38 * done
39 * cp /proc/stat /proc/meminfo /proc/loadavg .
40 * top -bn1 >top.out
41 *
42 * ...and how to run top on it on another machine:
43 * rm -rf proc; mkdir proc
44 * for f in [0-9]*_stat; do
45 * p=${f%_stat}
46 * mkdir -p proc/$p
47 * cp $f proc/$p/stat
48 * done
49 * cp stat meminfo loadavg proc
50 * chroot . ./top -bn1 >top1.out
51 */
52
53//config:config TOP
54//config: bool "top"
55//config: default y
56//config: help
57//config: The top program provides a dynamic real-time view of a running
58//config: system.
59//config:
60//config:config FEATURE_TOP_CPU_USAGE_PERCENTAGE
61//config: bool "Show CPU per-process usage percentage"
62//config: default y
63//config: depends on TOP
64//config: help
65//config: Make top display CPU usage for each process.
66//config: This adds about 2k.
67//config:
68//config:config FEATURE_TOP_CPU_GLOBAL_PERCENTS
69//config: bool "Show CPU global usage percentage"
70//config: default y
71//config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
72//config: help
73//config: Makes top display "CPU: NN% usr NN% sys..." line.
74//config: This adds about 0.5k.
75//config:
76//config:config FEATURE_TOP_SMP_CPU
77//config: bool "SMP CPU usage display ('c' key)"
78//config: default y
79//config: depends on FEATURE_TOP_CPU_GLOBAL_PERCENTS
80//config: help
81//config: Allow 'c' key to switch between individual/cumulative CPU stats
82//config: This adds about 0.5k.
83//config:
84//config:config FEATURE_TOP_DECIMALS
85//config: bool "Show 1/10th of a percent in CPU/mem statistics"
86//config: default y
87//config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
88//config: help
89//config: Show 1/10th of a percent in CPU/mem statistics.
90//config: This adds about 0.3k.
91//config:
92//config:config FEATURE_TOP_SMP_PROCESS
93//config: bool "Show CPU process runs on ('j' field)"
94//config: default y
95//config: depends on TOP
96//config: help
97//config: Show CPU where process was last found running on.
98//config: This is the 'j' field.
99//config:
100//config:config FEATURE_TOPMEM
101//config: bool "Topmem command ('s' key)"
102//config: default y
103//config: depends on TOP
104//config: help
105//config: Enable 's' in top (gives lots of memory info).
106
107#include "libbb.h"
108
109
110typedef struct top_status_t {
111 unsigned long vsz;
112#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
113 unsigned long ticks;
114 unsigned pcpu; /* delta of ticks */
115#endif
116 unsigned pid, ppid;
117 unsigned uid;
118 char state[4];
119 char comm[COMM_LEN];
120#if ENABLE_FEATURE_TOP_SMP_PROCESS
121 int last_seen_on_cpu;
122#endif
123} top_status_t;
124
125typedef struct jiffy_counts_t {
126 /* Linux 2.4.x has only first four */
127 unsigned long long usr, nic, sys, idle;
128 unsigned long long iowait, irq, softirq, steal;
129 unsigned long long total;
130 unsigned long long busy;
131} jiffy_counts_t;
132
133/* This structure stores some critical information from one frame to
134 the next. Used for finding deltas. */
135typedef struct save_hist {
136 unsigned long ticks;
137 pid_t pid;
138} save_hist;
139
140typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
141
142
143enum { SORT_DEPTH = 3 };
144
145
146struct globals {
147 top_status_t *top;
148 int ntop;
149 smallint inverted;
150#if ENABLE_FEATURE_TOPMEM
151 smallint sort_field;
152#endif
153#if ENABLE_FEATURE_TOP_SMP_CPU
154 smallint smp_cpu_info; /* one/many cpu info lines? */
155#endif
156 unsigned lines; /* screen height */
157#if ENABLE_FEATURE_USE_TERMIOS
158 struct termios initial_settings;
159 int scroll_ofs;
160#define G_scroll_ofs G.scroll_ofs
161#else
162#define G_scroll_ofs 0
163#endif
164#if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
165 cmp_funcp sort_function[1];
166#else
167 cmp_funcp sort_function[SORT_DEPTH];
168 struct save_hist *prev_hist;
169 int prev_hist_count;
170 jiffy_counts_t cur_jif, prev_jif;
171 /* int hist_iterations; */
172 unsigned total_pcpu;
173 /* unsigned long total_vsz; */
174#endif
175#if ENABLE_FEATURE_TOP_SMP_CPU
176 /* Per CPU samples: current and last */
177 jiffy_counts_t *cpu_jif, *cpu_prev_jif;
178 int num_cpus;
179#endif
180#if ENABLE_FEATURE_USE_TERMIOS
181 char kbd_input[KEYCODE_BUFFER_SIZE];
182#endif
183 char line_buf[80];
184}; //FIX_ALIASING; - large code growth
185enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
186#define G (*(struct globals*)&bb_common_bufsiz1)
187struct BUG_bad_size {
188 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
189 char BUG_line_buf_too_small[LINE_BUF_SIZE > 80 ? 1 : -1];
190};
191#define top (G.top )
192#define ntop (G.ntop )
193#define sort_field (G.sort_field )
194#define inverted (G.inverted )
195#define smp_cpu_info (G.smp_cpu_info )
196#define initial_settings (G.initial_settings )
197#define sort_function (G.sort_function )
198#define prev_hist (G.prev_hist )
199#define prev_hist_count (G.prev_hist_count )
200#define cur_jif (G.cur_jif )
201#define prev_jif (G.prev_jif )
202#define cpu_jif (G.cpu_jif )
203#define cpu_prev_jif (G.cpu_prev_jif )
204#define num_cpus (G.num_cpus )
205#define total_pcpu (G.total_pcpu )
206#define line_buf (G.line_buf )
207#define INIT_G() do { } while (0)
208
209enum {
210 OPT_d = (1 << 0),
211 OPT_n = (1 << 1),
212 OPT_b = (1 << 2),
213 OPT_m = (1 << 3),
214 OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
215};
216#define OPT_BATCH_MODE (option_mask32 & OPT_b)
217
218
219#if ENABLE_FEATURE_USE_TERMIOS
220static int pid_sort(top_status_t *P, top_status_t *Q)
221{
222 /* Buggy wrt pids with high bit set */
223 /* (linux pids are in [1..2^15-1]) */
224 return (Q->pid - P->pid);
225}
226#endif
227
228static int mem_sort(top_status_t *P, top_status_t *Q)
229{
230 /* We want to avoid unsigned->signed and truncation errors */
231 if (Q->vsz < P->vsz) return -1;
232 return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
233}
234
235
236#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
237
238static int pcpu_sort(top_status_t *P, top_status_t *Q)
239{
240 /* Buggy wrt ticks with high bit set */
241 /* Affects only processes for which ticks overflow */
242 return (int)Q->pcpu - (int)P->pcpu;
243}
244
245static int time_sort(top_status_t *P, top_status_t *Q)
246{
247 /* We want to avoid unsigned->signed and truncation errors */
248 if (Q->ticks < P->ticks) return -1;
249 return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
250}
251
252static int mult_lvl_cmp(void* a, void* b)
253{
254 int i, cmp_val;
255
256 for (i = 0; i < SORT_DEPTH; i++) {
257 cmp_val = (*sort_function[i])(a, b);
258 if (cmp_val != 0)
259 break;
260 }
261 return inverted ? -cmp_val : cmp_val;
262}
263
264static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
265{
266#if !ENABLE_FEATURE_TOP_SMP_CPU
267 static const char fmt[] = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
268#else
269 static const char fmt[] = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
270#endif
271 int ret;
272
273 if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
274 return 0;
275 ret = sscanf(line_buf, fmt,
276 &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
277 &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
278 &p_jif->steal);
279 if (ret >= 4) {
280 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
281 + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
282 /* procps 2.x does not count iowait as busy time */
283 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
284 }
285
286 return ret;
287}
288
289static void get_jiffy_counts(void)
290{
291 FILE* fp = xfopen_for_read("stat");
292
293 /* We need to parse cumulative counts even if SMP CPU display is on,
294 * they are used to calculate per process CPU% */
295 prev_jif = cur_jif;
296 if (read_cpu_jiffy(fp, &cur_jif) < 4)
297 bb_error_msg_and_die("can't read '%s'", "/proc/stat");
298
299#if !ENABLE_FEATURE_TOP_SMP_CPU
300 fclose(fp);
301 return;
302#else
303 if (!smp_cpu_info) {
304 fclose(fp);
305 return;
306 }
307
308 if (!num_cpus) {
309 /* First time here. How many CPUs?
310 * There will be at least 1 /proc/stat line with cpu%d
311 */
312 while (1) {
313 cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
314 if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
315 break;
316 num_cpus++;
317 }
318 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
319 smp_cpu_info = 0;
320
321 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
322
323 /* Otherwise the first per cpu display shows all 100% idles */
324 usleep(50000);
325 } else { /* Non first time invocation */
326 jiffy_counts_t *tmp;
327 int i;
328
329 /* First switch the sample pointers: no need to copy */
330 tmp = cpu_prev_jif;
331 cpu_prev_jif = cpu_jif;
332 cpu_jif = tmp;
333
334 /* Get the new samples */
335 for (i = 0; i < num_cpus; i++)
336 read_cpu_jiffy(fp, &cpu_jif[i]);
337 }
338#endif
339 fclose(fp);
340}
341
342static void do_stats(void)
343{
344 top_status_t *cur;
345 pid_t pid;
346 int i, last_i, n;
347 struct save_hist *new_hist;
348
349 get_jiffy_counts();
350 total_pcpu = 0;
351 /* total_vsz = 0; */
352 new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
353 /*
354 * Make a pass through the data to get stats.
355 */
356 /* hist_iterations = 0; */
357 i = 0;
358 for (n = 0; n < ntop; n++) {
359 cur = top + n;
360
361 /*
362 * Calculate time in cur process. Time is sum of user time
363 * and system time
364 */
365 pid = cur->pid;
366 new_hist[n].ticks = cur->ticks;
367 new_hist[n].pid = pid;
368
369 /* find matching entry from previous pass */
370 cur->pcpu = 0;
371 /* do not start at index 0, continue at last used one
372 * (brought hist_iterations from ~14000 down to 172) */
373 last_i = i;
374 if (prev_hist_count) do {
375 if (prev_hist[i].pid == pid) {
376 cur->pcpu = cur->ticks - prev_hist[i].ticks;
377 total_pcpu += cur->pcpu;
378 break;
379 }
380 i = (i+1) % prev_hist_count;
381 /* hist_iterations++; */
382 } while (i != last_i);
383 /* total_vsz += cur->vsz; */
384 }
385
386 /*
387 * Save cur frame's information.
388 */
389 free(prev_hist);
390 prev_hist = new_hist;
391 prev_hist_count = ntop;
392}
393
394#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
395
396#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
397/* formats 7 char string (8 with terminating NUL) */
398static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
399{
400 unsigned t;
401 if (value >= total) { /* 100% ? */
402 strcpy(pbuf, " 100% ");
403 return pbuf;
404 }
405 /* else generate " [N/space]N.N% " string */
406 value = 1000 * value / total;
407 t = value / 100;
408 value = value % 100;
409 pbuf[0] = ' ';
410 pbuf[1] = t ? t + '0' : ' ';
411 pbuf[2] = '0' + (value / 10);
412 pbuf[3] = '.';
413 pbuf[4] = '0' + (value % 10);
414 pbuf[5] = '%';
415 pbuf[6] = ' ';
416 pbuf[7] = '\0';
417 return pbuf;
418}
419#endif
420
421#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
422static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
423{
424 /*
425 * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
426 */
427 unsigned total_diff;
428 jiffy_counts_t *p_jif, *p_prev_jif;
429 int i;
430# if ENABLE_FEATURE_TOP_SMP_CPU
431 int n_cpu_lines;
432# endif
433
434 /* using (unsigned) casts to make operations cheaper */
435# define CALC_TOTAL_DIFF do { \
436 total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
437 if (total_diff == 0) total_diff = 1; \
438} while (0)
439
440# if ENABLE_FEATURE_TOP_DECIMALS
441# define CALC_STAT(xxx) char xxx[8]
442# define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
443# define FMT "%s"
444# else
445# define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
446# define SHOW_STAT(xxx) xxx
447# define FMT "%4u%% "
448# endif
449
450# if !ENABLE_FEATURE_TOP_SMP_CPU
451 {
452 i = 1;
453 p_jif = &cur_jif;
454 p_prev_jif = &prev_jif;
455# else
456 /* Loop thru CPU(s) */
457 n_cpu_lines = smp_cpu_info ? num_cpus : 1;
458 if (n_cpu_lines > *lines_rem_p)
459 n_cpu_lines = *lines_rem_p;
460
461 for (i = 0; i < n_cpu_lines; i++) {
462 p_jif = &cpu_jif[i];
463 p_prev_jif = &cpu_prev_jif[i];
464# endif
465 CALC_TOTAL_DIFF;
466
467 { /* Need a block: CALC_STAT are declarations */
468 CALC_STAT(usr);
469 CALC_STAT(sys);
470 CALC_STAT(nic);
471 CALC_STAT(idle);
472 CALC_STAT(iowait);
473 CALC_STAT(irq);
474 CALC_STAT(softirq);
475 /*CALC_STAT(steal);*/
476
477 snprintf(scrbuf, scr_width,
478 /* Barely fits in 79 chars when in "decimals" mode. */
479# if ENABLE_FEATURE_TOP_SMP_CPU
480 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
481 (smp_cpu_info ? utoa(i) : ""),
482# else
483 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
484# endif
485 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
486 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
487 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
488 /* I doubt anyone wants to know it */
489 );
490 puts(scrbuf);
491 }
492 }
493# undef SHOW_STAT
494# undef CALC_STAT
495# undef FMT
496 *lines_rem_p -= i;
497}
498#else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
499# define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
500#endif
501
502static unsigned long display_header(int scr_width, int *lines_rem_p)
503{
504 FILE *fp;
505 char buf[80];
506 char scrbuf[80];
507 unsigned long total, used, mfree, shared, buffers, cached;
508
509 /* read memory info */
510 fp = xfopen_for_read("meminfo");
511
512 /*
513 * Old kernels (such as 2.4.x) had a nice summary of memory info that
514 * we could parse, however this is gone entirely in 2.6. Try parsing
515 * the old way first, and if that fails, parse each field manually.
516 *
517 * First, we read in the first line. Old kernels will have bogus
518 * strings we don't care about, whereas new kernels will start right
519 * out with MemTotal:
520 * -- PFM.
521 */
522 if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
523 fgets(buf, sizeof(buf), fp); /* skip first line */
524
525 fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
526 &total, &used, &mfree, &shared, &buffers, &cached);
527 /* convert to kilobytes */
528 used /= 1024;
529 mfree /= 1024;
530 shared /= 1024;
531 buffers /= 1024;
532 cached /= 1024;
533 total /= 1024;
534 } else {
535 /*
536 * Revert to manual parsing, which incidentally already has the
537 * sizes in kilobytes. This should be safe for both 2.4 and
538 * 2.6.
539 */
540 fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
541
542 /*
543 * MemShared: is no longer present in 2.6. Report this as 0,
544 * to maintain consistent behavior with normal procps.
545 */
546 if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
547 shared = 0;
548
549 fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
550 fscanf(fp, "Cached: %lu %s\n", &cached, buf);
551
552 used = total - mfree;
553 }
554 fclose(fp);
555
556 /* output memory info */
557 if (scr_width > (int)sizeof(scrbuf))
558 scr_width = sizeof(scrbuf);
559 snprintf(scrbuf, scr_width,
560 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
561 used, mfree, shared, buffers, cached);
562 /* go to top & clear to the end of screen */
563 printf(OPT_BATCH_MODE ? "%s\n" : "\033[H\033[J%s\n", scrbuf);
564 (*lines_rem_p)--;
565
566 /* Display CPU time split as percentage of total time
567 * This displays either a cumulative line or one line per CPU
568 */
569 display_cpus(scr_width, scrbuf, lines_rem_p);
570
571 /* read load average as a string */
572 buf[0] = '\0';
573 open_read_close("loadavg", buf, sizeof(buf) - 1);
574 buf[sizeof(buf) - 1] = '\n';
575 *strchr(buf, '\n') = '\0';
576 snprintf(scrbuf, scr_width, "Load average: %s", buf);
577 puts(scrbuf);
578 (*lines_rem_p)--;
579
580 return total;
581}
582
583static NOINLINE void display_process_list(int lines_rem, int scr_width)
584{
585 enum {
586 BITS_PER_INT = sizeof(int) * 8
587 };
588
589 top_status_t *s;
590 char vsz_str_buf[8];
591 unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
592 /* xxx_shift and xxx_scale variables allow us to replace
593 * expensive divides with multiply and shift */
594 unsigned pmem_shift, pmem_scale, pmem_half;
595#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
596 unsigned tmp_unsigned;
597 unsigned pcpu_shift, pcpu_scale, pcpu_half;
598 unsigned busy_jifs;
599#endif
600
601 /* what info of the processes is shown */
602 printf(OPT_BATCH_MODE ? "%.*s" : "\033[7m%.*s\033[0m", scr_width,
603 " PID PPID USER STAT VSZ %VSZ"
604 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
605 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
606 " COMMAND");
607 lines_rem--;
608
609#if ENABLE_FEATURE_TOP_DECIMALS
610# define UPSCALE 1000
611# define CALC_STAT(name, val) div_t name = div((val), 10)
612# define SHOW_STAT(name) name.quot, '0'+name.rem
613# define FMT "%3u.%c"
614#else
615# define UPSCALE 100
616# define CALC_STAT(name, val) unsigned name = (val)
617# define SHOW_STAT(name) name
618# define FMT "%4u%%"
619#endif
620 /*
621 * %VSZ = s->vsz/MemTotal
622 */
623 pmem_shift = BITS_PER_INT-11;
624 pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
625 /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
626 while (pmem_scale >= 512) {
627 pmem_scale /= 4;
628 pmem_shift -= 2;
629 }
630 pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
631#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
632 busy_jifs = cur_jif.busy - prev_jif.busy;
633 /* This happens if there were lots of short-lived processes
634 * between two top updates (e.g. compilation) */
635 if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
636
637 /*
638 * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
639 * (pcpu is delta of sys+user time between samples)
640 */
641 /* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
642 * in 0..~64000 range (HZ*update_interval).
643 * we assume that unsigned is at least 32-bit.
644 */
645 pcpu_shift = 6;
646 pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
647 if (pcpu_scale == 0)
648 pcpu_scale = 1;
649 while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
650 pcpu_scale *= 4;
651 pcpu_shift += 2;
652 }
653 tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
654 if (tmp_unsigned != 0)
655 pcpu_scale /= tmp_unsigned;
656 /* we want (s->pcpu * pcpu_scale) to never overflow */
657 while (pcpu_scale >= 1024) {
658 pcpu_scale /= 4;
659 pcpu_shift -= 2;
660 }
661 pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
662 /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
663#endif
664
665 /* Ok, all preliminary data is ready, go through the list */
666 scr_width += 2; /* account for leading '\n' and trailing NUL */
667 if (lines_rem > ntop - G_scroll_ofs)
668 lines_rem = ntop - G_scroll_ofs;
669 s = top + G_scroll_ofs;
670 while (--lines_rem >= 0) {
671 unsigned col;
672 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
673#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
674 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
675#endif
676
677 if (s->vsz >= 100000)
678 sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
679 else
680 sprintf(vsz_str_buf, "%7lu", s->vsz);
681 /* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
682 col = snprintf(line_buf, scr_width,
683 "\n" "%5u%6u %-8.8s %s%s" FMT
684 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
685 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
686 " ",
687 s->pid, s->ppid, get_cached_username(s->uid),
688 s->state, vsz_str_buf,
689 SHOW_STAT(pmem)
690 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
691 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
692 );
693 if ((int)(col + 1) < scr_width)
694 read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
695 fputs(line_buf, stdout);
696 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
697 cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
698 s++;
699 }
700 /* printf(" %d", hist_iterations); */
701 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
702 fflush_all();
703}
704#undef UPSCALE
705#undef SHOW_STAT
706#undef CALC_STAT
707#undef FMT
708
709static void clearmems(void)
710{
711 clear_username_cache();
712 free(top);
713 top = NULL;
714}
715
716#if ENABLE_FEATURE_USE_TERMIOS
717
718static void reset_term(void)
719{
720 if (!OPT_BATCH_MODE)
721 tcsetattr_stdin_TCSANOW(&initial_settings);
722 if (ENABLE_FEATURE_CLEAN_UP) {
723 clearmems();
724# if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
725 free(prev_hist);
726# endif
727 }
728}
729
730static void sig_catcher(int sig)
731{
732 reset_term();
733 kill_myself_with_sig(sig);
734}
735
736#endif /* FEATURE_USE_TERMIOS */
737
738/*
739 * TOPMEM support
740 */
741
742typedef unsigned long mem_t;
743
744typedef struct topmem_status_t {
745 unsigned pid;
746 char comm[COMM_LEN];
747 /* vsz doesn't count /dev/xxx mappings except /dev/zero */
748 mem_t vsz ;
749 mem_t vszrw ;
750 mem_t rss ;
751 mem_t rss_sh ;
752 mem_t dirty ;
753 mem_t dirty_sh;
754 mem_t stack ;
755} topmem_status_t;
756
757enum { NUM_SORT_FIELD = 7 };
758
759#define topmem ((topmem_status_t*)top)
760
761#if ENABLE_FEATURE_TOPMEM
762
763static int topmem_sort(char *a, char *b)
764{
765 int n;
766 mem_t l, r;
767
768 n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
769 l = *(mem_t*)(a + n);
770 r = *(mem_t*)(b + n);
771 if (l == r) {
772 l = ((topmem_status_t*)a)->dirty;
773 r = ((topmem_status_t*)b)->dirty;
774 }
775 /* We want to avoid unsigned->signed and truncation errors */
776 /* l>r: -1, l=r: 0, l<r: 1 */
777 n = (l > r) ? -1 : (l != r);
778 return inverted ? -n : n;
779}
780
781/* display header info (meminfo / loadavg) */
782static void display_topmem_header(int scr_width, int *lines_rem_p)
783{
784 enum {
785 TOTAL = 0, MFREE, BUF, CACHE,
786 SWAPTOTAL, SWAPFREE, DIRTY,
787 MWRITE, ANON, MAP, SLAB,
788 NUM_FIELDS
789 };
790 static const char match[NUM_FIELDS][12] = {
791 "\x09" "MemTotal:", // TOTAL
792 "\x08" "MemFree:", // MFREE
793 "\x08" "Buffers:", // BUF
794 "\x07" "Cached:", // CACHE
795 "\x0a" "SwapTotal:", // SWAPTOTAL
796 "\x09" "SwapFree:", // SWAPFREE
797 "\x06" "Dirty:", // DIRTY
798 "\x0a" "Writeback:", // MWRITE
799 "\x0a" "AnonPages:", // ANON
800 "\x07" "Mapped:", // MAP
801 "\x05" "Slab:", // SLAB
802 };
803 char meminfo_buf[4 * 1024];
804 const char *Z[NUM_FIELDS];
805 unsigned i;
806 int sz;
807
808 for (i = 0; i < NUM_FIELDS; i++)
809 Z[i] = "?";
810
811 /* read memory info */
812 sz = open_read_close("meminfo", meminfo_buf, sizeof(meminfo_buf) - 1);
813 if (sz >= 0) {
814 char *p = meminfo_buf;
815 meminfo_buf[sz] = '\0';
816 /* Note that fields always appear in the match[] order */
817 for (i = 0; i < NUM_FIELDS; i++) {
818 char *found = strstr(p, match[i] + 1);
819 if (found) {
820 /* Cut "NNNN" out of " NNNN kb" */
821 char *s = skip_whitespace(found + match[i][0]);
822 p = skip_non_whitespace(s);
823 *p++ = '\0';
824 Z[i] = s;
825 }
826 }
827 }
828
829 snprintf(line_buf, LINE_BUF_SIZE,
830 "Mem total:%s anon:%s map:%s free:%s",
831 Z[TOTAL], Z[ANON], Z[MAP], Z[MFREE]);
832 printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, line_buf);
833
834 snprintf(line_buf, LINE_BUF_SIZE,
835 " slab:%s buf:%s cache:%s dirty:%s write:%s",
836 Z[SLAB], Z[BUF], Z[CACHE], Z[DIRTY], Z[MWRITE]);
837 printf("%.*s\n", scr_width, line_buf);
838
839 snprintf(line_buf, LINE_BUF_SIZE,
840 "Swap total:%s free:%s", // TODO: % used?
841 Z[SWAPTOTAL], Z[SWAPFREE]);
842 printf("%.*s\n", scr_width, line_buf);
843
844 (*lines_rem_p) -= 3;
845}
846
847static void ulltoa6_and_space(unsigned long long ul, char buf[6])
848{
849 /* see http://en.wikipedia.org/wiki/Tera */
850 smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
851}
852
853static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
854{
855#define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
856#define MIN_WIDTH sizeof(HDR_STR)
857 const topmem_status_t *s = topmem + G_scroll_ofs;
858
859 display_topmem_header(scr_width, &lines_rem);
860 strcpy(line_buf, HDR_STR " COMMAND");
861 line_buf[11 + sort_field * 6] = "^_"[inverted];
862 printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
863 lines_rem--;
864
865 if (lines_rem > ntop - G_scroll_ofs)
866 lines_rem = ntop - G_scroll_ofs;
867 while (--lines_rem >= 0) {
868 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
869 ulltoa6_and_space(s->pid , &line_buf[0*6]);
870 ulltoa6_and_space(s->vsz , &line_buf[1*6]);
871 ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
872 ulltoa6_and_space(s->rss , &line_buf[3*6]);
873 ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
874 ulltoa6_and_space(s->dirty , &line_buf[5*6]);
875 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
876 ulltoa6_and_space(s->stack , &line_buf[7*6]);
877 line_buf[8*6] = '\0';
878 if (scr_width > (int)MIN_WIDTH) {
879 read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
880 }
881 printf("\n""%.*s", scr_width, line_buf);
882 s++;
883 }
884 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
885 fflush_all();
886#undef HDR_STR
887#undef MIN_WIDTH
888}
889
890#else
891void display_topmem_process_list(int lines_rem, int scr_width);
892int topmem_sort(char *a, char *b);
893#endif /* TOPMEM */
894
895/*
896 * end TOPMEM support
897 */
898
899enum {
900 TOP_MASK = 0
901 | PSSCAN_PID
902 | PSSCAN_PPID
903 | PSSCAN_VSZ
904 | PSSCAN_STIME
905 | PSSCAN_UTIME
906 | PSSCAN_STATE
907 | PSSCAN_COMM
908 | PSSCAN_CPU
909 | PSSCAN_UIDGID,
910 TOPMEM_MASK = 0
911 | PSSCAN_PID
912 | PSSCAN_SMAPS
913 | PSSCAN_COMM,
914 EXIT_MASK = (unsigned)-1,
915};
916
917#if ENABLE_FEATURE_USE_TERMIOS
918static unsigned handle_input(unsigned scan_mask, unsigned interval)
919{
920 struct pollfd pfd[1];
921
922 if (option_mask32 & OPT_EOF) {
923 /* EOF on stdin ("top </dev/null") */
924 sleep(interval);
925 return scan_mask;
926 }
927
928 pfd[0].fd = 0;
929 pfd[0].events = POLLIN;
930
931 while (1) {
932 int32_t c;
933
934 c = read_key(STDIN_FILENO, G.kbd_input, interval * 1000);
935 if (c == -1 && errno != EAGAIN) {
936 /* error/EOF */
937 option_mask32 |= OPT_EOF;
938 break;
939 }
940 interval = 0;
941
942 if (c == initial_settings.c_cc[VINTR])
943 return EXIT_MASK;
944 if (c == initial_settings.c_cc[VEOF])
945 return EXIT_MASK;
946
947 if (c == KEYCODE_UP) {
948 G_scroll_ofs--;
949 goto normalize_ofs;
950 }
951 if (c == KEYCODE_DOWN) {
952 G_scroll_ofs++;
953 goto normalize_ofs;
954 }
955 if (c == KEYCODE_HOME) {
956 G_scroll_ofs = 0;
957 break;
958 }
959 if (c == KEYCODE_END) {
960 G_scroll_ofs = ntop - G.lines / 2;
961 goto normalize_ofs;
962 }
963 if (c == KEYCODE_PAGEUP) {
964 G_scroll_ofs -= G.lines / 2;
965 goto normalize_ofs;
966 }
967 if (c == KEYCODE_PAGEDOWN) {
968 G_scroll_ofs += G.lines / 2;
969 normalize_ofs:
970 if (G_scroll_ofs >= ntop)
971 G_scroll_ofs = ntop - 1;
972 if (G_scroll_ofs < 0)
973 G_scroll_ofs = 0;
974 break;
975 }
976
977 c |= 0x20; /* lowercase */
978 if (c == 'q')
979 return EXIT_MASK;
980
981 if (c == 'n') {
982 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
983 sort_function[0] = pid_sort;
984 continue;
985 }
986 if (c == 'm') {
987 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
988 sort_function[0] = mem_sort;
989# if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
990 sort_function[1] = pcpu_sort;
991 sort_function[2] = time_sort;
992# endif
993 continue;
994 }
995# if ENABLE_FEATURE_SHOW_THREADS
996 if (c == 'h'
997 IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
998 ) {
999 scan_mask ^= PSSCAN_TASKS;
1000 continue;
1001 }
1002# endif
1003# if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1004 if (c == 'p') {
1005 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
1006 sort_function[0] = pcpu_sort;
1007 sort_function[1] = mem_sort;
1008 sort_function[2] = time_sort;
1009 continue;
1010 }
1011 if (c == 't') {
1012 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
1013 sort_function[0] = time_sort;
1014 sort_function[1] = mem_sort;
1015 sort_function[2] = pcpu_sort;
1016 continue;
1017 }
1018# if ENABLE_FEATURE_TOPMEM
1019 if (c == 's') {
1020 scan_mask = TOPMEM_MASK;
1021 free(prev_hist);
1022 prev_hist = NULL;
1023 prev_hist_count = 0;
1024 sort_field = (sort_field + 1) % NUM_SORT_FIELD;
1025 continue;
1026 }
1027# endif
1028 if (c == 'r') {
1029 inverted ^= 1;
1030 continue;
1031 }
1032# if ENABLE_FEATURE_TOP_SMP_CPU
1033 /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
1034 if (c == 'c' || c == '1') {
1035 /* User wants to toggle per cpu <> aggregate */
1036 if (smp_cpu_info) {
1037 free(cpu_prev_jif);
1038 free(cpu_jif);
1039 cpu_jif = &cur_jif;
1040 cpu_prev_jif = &prev_jif;
1041 } else {
1042 /* Prepare for xrealloc() */
1043 cpu_jif = cpu_prev_jif = NULL;
1044 }
1045 num_cpus = 0;
1046 smp_cpu_info = !smp_cpu_info;
1047 get_jiffy_counts();
1048 continue;
1049 }
1050# endif
1051# endif
1052 break; /* unknown key -> force refresh */
1053 }
1054
1055 return scan_mask;
1056}
1057#endif
1058
1059//usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
1060//usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
1061//usage:#else
1062//usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
1063//usage:#endif
1064//usage:#define top_trivial_usage
1065//usage: "[-b] [-nCOUNT] [-dSECONDS]" IF_FEATURE_TOPMEM(" [-m]")
1066//usage:#define top_full_usage "\n\n"
1067//usage: "Provide a view of process activity in real time."
1068//usage: "\n""Read the status of all processes from /proc each SECONDS"
1069//usage: "\n""and display a screenful of them."
1070//usage: "\n""Keys:"
1071//usage: "\n"" N/M"
1072//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/P")
1073//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/T")
1074//usage: ": " IF_FEATURE_TOPMEM("show CPU usage, ") "sort by pid/mem"
1075//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/cpu")
1076//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/time")
1077//usage: IF_FEATURE_TOPMEM(
1078//usage: "\n"" S: show memory"
1079//usage: )
1080//usage: "\n"" R: reverse sort"
1081//usage: IF_SHOW_THREADS_OR_TOP_SMP(
1082//usage: "\n"" "
1083//usage: IF_FEATURE_SHOW_THREADS("H: toggle threads")
1084//usage: IF_FEATURE_SHOW_THREADS(IF_FEATURE_TOP_SMP_CPU(", "))
1085//usage: IF_FEATURE_TOP_SMP_CPU("1: toggle SMP")
1086//usage: )
1087//usage: "\n"" Q,^C: exit"
1088//usage: "\n"
1089//usage: "\n""Options:"
1090//usage: "\n"" -b Batch mode"
1091//usage: "\n"" -n N Exit after N iterations"
1092//usage: "\n"" -d N Delay between updates"
1093//usage: IF_FEATURE_TOPMEM(
1094//usage: "\n"" -m Same as 's' key"
1095//usage: )
1096
1097/* Interactive testing:
1098 * echo sss | ./busybox top
1099 * - shows memory screen
1100 * echo sss | ./busybox top -bn1 >mem
1101 * - saves memory screen - the *whole* list, not first NROWS processes!
1102 * echo .m.s.s.s.s.s.s.q | ./busybox top -b >z
1103 * - saves several different screens, and exits
1104 *
1105 * TODO: -i STRING param as a better alternative?
1106 */
1107
1108int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1109int top_main(int argc UNUSED_PARAM, char **argv)
1110{
1111 int iterations;
1112 unsigned col;
1113 unsigned interval;
1114 char *str_interval, *str_iterations;
1115 unsigned scan_mask = TOP_MASK;
1116#if ENABLE_FEATURE_USE_TERMIOS
1117 struct termios new_settings;
1118#endif
1119
1120 INIT_G();
1121
1122 interval = 5; /* default update interval is 5 seconds */
1123 iterations = 0; /* infinite */
1124#if ENABLE_FEATURE_TOP_SMP_CPU
1125 /*num_cpus = 0;*/
1126 /*smp_cpu_info = 0;*/ /* to start with show aggregate */
1127 cpu_jif = &cur_jif;
1128 cpu_prev_jif = &prev_jif;
1129#endif
1130
1131 /* all args are options; -n NUM */
1132 opt_complementary = "-"; /* options can be specified w/o dash */
1133 col = getopt32(argv, "d:n:b"IF_FEATURE_TOPMEM("m"), &str_interval, &str_iterations);
1134#if ENABLE_FEATURE_TOPMEM
1135 if (col & OPT_m) /* -m (busybox specific) */
1136 scan_mask = TOPMEM_MASK;
1137#endif
1138 if (col & OPT_d) {
1139 /* work around for "-d 1" -> "-d -1" done by getopt32
1140 * (opt_complementary == "-" does this) */
1141 if (str_interval[0] == '-')
1142 str_interval++;
1143 /* Need to limit it to not overflow poll timeout */
1144 interval = xatou16(str_interval);
1145 }
1146 if (col & OPT_n) {
1147 if (str_iterations[0] == '-')
1148 str_iterations++;
1149 iterations = xatou(str_iterations);
1150 }
1151
1152 /* change to /proc */
1153 xchdir("/proc");
1154
1155#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1156 sort_function[0] = pcpu_sort;
1157 sort_function[1] = mem_sort;
1158 sort_function[2] = time_sort;
1159#else
1160 sort_function[0] = mem_sort;
1161#endif
1162
1163 if (OPT_BATCH_MODE) {
1164 option_mask32 |= OPT_EOF;
1165 }
1166#if ENABLE_FEATURE_USE_TERMIOS
1167 else {
1168 tcgetattr(0, (void *) &initial_settings);
1169 memcpy(&new_settings, &initial_settings, sizeof(new_settings));
1170 /* unbuffered input, turn off echo */
1171 new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
1172 tcsetattr_stdin_TCSANOW(&new_settings);
1173 }
1174
1175 bb_signals(BB_FATAL_SIGS, sig_catcher);
1176
1177 /* Eat initial input, if any */
1178 scan_mask = handle_input(scan_mask, 0);
1179#endif
1180
1181 while (scan_mask != EXIT_MASK) {
1182 procps_status_t *p = NULL;
1183
1184 if (OPT_BATCH_MODE) {
1185 G.lines = INT_MAX;
1186 col = LINE_BUF_SIZE - 2; /* +2 bytes for '\n', NUL */
1187 } else {
1188 G.lines = 24; /* default */
1189 col = 79;
1190#if ENABLE_FEATURE_USE_TERMIOS
1191 /* We output to stdout, we need size of stdout (not stdin)! */
1192 get_terminal_width_height(STDOUT_FILENO, &col, &G.lines);
1193 if (G.lines < 5 || col < 10) {
1194 sleep(interval);
1195 continue;
1196 }
1197#endif
1198 if (col > LINE_BUF_SIZE - 2)
1199 col = LINE_BUF_SIZE - 2;
1200 }
1201
1202 /* read process IDs & status for all the processes */
1203 ntop = 0;
1204 while ((p = procps_scan(p, scan_mask)) != NULL) {
1205 int n;
1206#if ENABLE_FEATURE_TOPMEM
1207 if (scan_mask != TOPMEM_MASK)
1208#endif
1209 {
1210 n = ntop;
1211 top = xrealloc_vector(top, 6, ntop++);
1212 top[n].pid = p->pid;
1213 top[n].ppid = p->ppid;
1214 top[n].vsz = p->vsz;
1215#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1216 top[n].ticks = p->stime + p->utime;
1217#endif
1218 top[n].uid = p->uid;
1219 strcpy(top[n].state, p->state);
1220 strcpy(top[n].comm, p->comm);
1221#if ENABLE_FEATURE_TOP_SMP_PROCESS
1222 top[n].last_seen_on_cpu = p->last_seen_on_cpu;
1223#endif
1224 }
1225#if ENABLE_FEATURE_TOPMEM
1226 else { /* TOPMEM */
1227 if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
1228 continue; /* kernel threads are ignored */
1229 n = ntop;
1230 /* No bug here - top and topmem are the same */
1231 top = xrealloc_vector(topmem, 6, ntop++);
1232 strcpy(topmem[n].comm, p->comm);
1233 topmem[n].pid = p->pid;
1234 topmem[n].vsz = p->smaps.mapped_rw + p->smaps.mapped_ro;
1235 topmem[n].vszrw = p->smaps.mapped_rw;
1236 topmem[n].rss_sh = p->smaps.shared_clean + p->smaps.shared_dirty;
1237 topmem[n].rss = p->smaps.private_clean + p->smaps.private_dirty + topmem[n].rss_sh;
1238 topmem[n].dirty = p->smaps.private_dirty + p->smaps.shared_dirty;
1239 topmem[n].dirty_sh = p->smaps.shared_dirty;
1240 topmem[n].stack = p->smaps.stack;
1241 }
1242#endif
1243 } /* end of "while we read /proc" */
1244 if (ntop == 0) {
1245 bb_error_msg("no process info in /proc");
1246 break;
1247 }
1248
1249 if (scan_mask != TOPMEM_MASK) {
1250#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1251 if (!prev_hist_count) {
1252 do_stats();
1253 usleep(100000);
1254 clearmems();
1255 continue;
1256 }
1257 do_stats();
1258 /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
1259 qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
1260#else
1261 qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1262#endif
1263 }
1264#if ENABLE_FEATURE_TOPMEM
1265 else { /* TOPMEM */
1266 qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1267 }
1268#endif
1269 if (scan_mask != TOPMEM_MASK)
1270 display_process_list(G.lines, col);
1271#if ENABLE_FEATURE_TOPMEM
1272 else
1273 display_topmem_process_list(G.lines, col);
1274#endif
1275 clearmems();
1276 if (iterations >= 0 && !--iterations)
1277 break;
1278#if !ENABLE_FEATURE_USE_TERMIOS
1279 sleep(interval);
1280#else
1281 scan_mask = handle_input(scan_mask, interval);
1282#endif /* FEATURE_USE_TERMIOS */
1283 } /* end of "while (not Q)" */
1284
1285 bb_putchar('\n');
1286#if ENABLE_FEATURE_USE_TERMIOS
1287 reset_term();
1288#endif
1289 return EXIT_SUCCESS;
1290}
1291
generated by cgit at 2024-05-16 01:45:13 (GMT)