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 //config:config TOP
53 //config: bool "top (18 kb)"
54 //config: default y
55 //config: help
56 //config: The top program provides a dynamic real-time view of a running
57 //config: system.
58 //config:
59 //config:config FEATURE_TOP_INTERACTIVE
60 //config: bool "Accept keyboard commands"
61 //config: default y
62 //config: depends on TOP
63 //config: help
64 //config: Without this, top will only refresh display every 5 seconds.
65 //config: No keyboard commands will work, only ^C to terminate.
66 //config:
67 //config:config FEATURE_TOP_CPU_USAGE_PERCENTAGE
68 //config: bool "Show CPU per-process usage percentage"
69 //config: default y
70 //config: depends on TOP
71 //config: help
72 //config: Make top display CPU usage for each process.
73 //config: This adds about 2k.
74 //config:
75 //config:config FEATURE_TOP_CPU_GLOBAL_PERCENTS
76 //config: bool "Show CPU global usage percentage"
77 //config: default y
78 //config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
79 //config: help
80 //config: Makes top display "CPU: NN% usr NN% sys..." line.
81 //config: This adds about 0.5k.
82 //config:
83 //config:config FEATURE_TOP_SMP_CPU
84 //config: bool "SMP CPU usage display ('c' key)"
85 //config: default y
86 //config: depends on FEATURE_TOP_CPU_GLOBAL_PERCENTS
87 //config: help
88 //config: Allow 'c' key to switch between individual/cumulative CPU stats
89 //config: This adds about 0.5k.
90 //config:
91 //config:config FEATURE_TOP_DECIMALS
92 //config: bool "Show 1/10th of a percent in CPU/mem statistics"
93 //config: default y
94 //config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
95 //config: help
96 //config: Show 1/10th of a percent in CPU/mem statistics.
97 //config: This adds about 0.3k.
98 //config:
99 //config:config FEATURE_TOP_SMP_PROCESS
100 //config: bool "Show CPU process runs on ('j' field)"
101 //config: default y
102 //config: depends on TOP
103 //config: help
104 //config: Show CPU where process was last found running on.
105 //config: This is the 'j' field.
106 //config:
107 //config:config FEATURE_TOPMEM
108 //config: bool "Topmem command ('s' key)"
109 //config: default y
110 //config: depends on TOP
111 //config: help
112 //config: Enable 's' in top (gives lots of memory info).
113
114 //applet:IF_TOP(APPLET(top, BB_DIR_USR_BIN, BB_SUID_DROP))
115
116 //kbuild:lib-$(CONFIG_TOP) += top.o
117
118 #include "libbb.h"
119
120 #define ESC "\033"
121
122 typedef struct top_status_t {
123 unsigned long vsz;
124 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
125 unsigned long ticks;
126 unsigned pcpu; /* delta of ticks */
127 #endif
128 unsigned pid, ppid;
129 unsigned uid;
130 char state[4];
131 char comm[COMM_LEN];
132 #if ENABLE_FEATURE_TOP_SMP_PROCESS
133 int last_seen_on_cpu;
134 #endif
135 } top_status_t;
136
137 typedef struct jiffy_counts_t {
138 /* Linux 2.4.x has only first four */
139 unsigned long long usr, nic, sys, idle;
140 unsigned long long iowait, irq, softirq, steal;
141 unsigned long long total;
142 unsigned long long busy;
143 } jiffy_counts_t;
144
145 /* This structure stores some critical information from one frame to
146 the next. Used for finding deltas. */
147 typedef struct save_hist {
148 unsigned long ticks;
149 pid_t pid;
150 } save_hist;
151
152 typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
153
154
155 enum { SORT_DEPTH = 3 };
156
157 /* Screens wider than this are unlikely */
158 enum { LINE_BUF_SIZE = 512 - 64 };
159
160 struct globals {
161 top_status_t *top;
162 int ntop;
163 smallint inverted;
164 #if ENABLE_FEATURE_TOPMEM
165 smallint sort_field;
166 #endif
167 #if ENABLE_FEATURE_TOP_SMP_CPU
168 smallint smp_cpu_info; /* one/many cpu info lines? */
169 #endif
170 unsigned lines; /* screen height */
171 #if ENABLE_FEATURE_TOP_INTERACTIVE
172 struct termios initial_settings;
173 int scroll_ofs;
174 #define G_scroll_ofs G.scroll_ofs
175 #else
176 #define G_scroll_ofs 0
177 #endif
178 #if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
179 cmp_funcp sort_function[1];
180 #else
181 cmp_funcp sort_function[SORT_DEPTH];
182 struct save_hist *prev_hist;
183 unsigned prev_hist_count;
184 jiffy_counts_t cur_jif, prev_jif;
185 /* int hist_iterations; */
186 unsigned total_pcpu;
187 /* unsigned long total_vsz; */
188 #endif
189 #if ENABLE_FEATURE_TOP_SMP_CPU
190 /* Per CPU samples: current and last */
191 jiffy_counts_t *cpu_jif, *cpu_prev_jif;
192 unsigned num_cpus;
193 #endif
194 #if ENABLE_FEATURE_TOP_INTERACTIVE
195 char kbd_input[KEYCODE_BUFFER_SIZE];
196 #endif
197 char line_buf[LINE_BUF_SIZE];
198 };
199 #define G (*ptr_to_globals)
200 #define top (G.top )
201 #define ntop (G.ntop )
202 #define sort_field (G.sort_field )
203 #define inverted (G.inverted )
204 #define smp_cpu_info (G.smp_cpu_info )
205 #define initial_settings (G.initial_settings )
206 #define sort_function (G.sort_function )
207 #define prev_hist (G.prev_hist )
208 #define prev_hist_count (G.prev_hist_count )
209 #define cur_jif (G.cur_jif )
210 #define prev_jif (G.prev_jif )
211 #define cpu_jif (G.cpu_jif )
212 #define cpu_prev_jif (G.cpu_prev_jif )
213 #define num_cpus (G.num_cpus )
214 #define total_pcpu (G.total_pcpu )
215 #define line_buf (G.line_buf )
216 #define INIT_G() do { \
217 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
218 BUILD_BUG_ON(LINE_BUF_SIZE <= 80); \
219 } while (0)
220
221 enum {
222 OPT_d = (1 << 0),
223 OPT_n = (1 << 1),
224 OPT_b = (1 << 2),
225 OPT_H = (1 << 3),
226 OPT_m = (1 << 4),
227 OPT_EOF = (1 << 5), /* pseudo: "we saw EOF in stdin" */
228 };
229 #define OPT_BATCH_MODE (option_mask32 & OPT_b)
230
231
232 #if ENABLE_FEATURE_TOP_INTERACTIVE
pid_sort(top_status_t * P,top_status_t * Q)233 static int pid_sort(top_status_t *P, top_status_t *Q)
234 {
235 /* Buggy wrt pids with high bit set */
236 /* (linux pids are in [1..2^15-1]) */
237 return (Q->pid - P->pid);
238 }
239 #endif
240
mem_sort(top_status_t * P,top_status_t * Q)241 static int mem_sort(top_status_t *P, top_status_t *Q)
242 {
243 /* We want to avoid unsigned->signed and truncation errors */
244 if (Q->vsz < P->vsz) return -1;
245 return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
246 }
247
248
249 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
250
pcpu_sort(top_status_t * P,top_status_t * Q)251 static int pcpu_sort(top_status_t *P, top_status_t *Q)
252 {
253 /* Buggy wrt ticks with high bit set */
254 /* Affects only processes for which ticks overflow */
255 return (int)Q->pcpu - (int)P->pcpu;
256 }
257
time_sort(top_status_t * P,top_status_t * Q)258 static int time_sort(top_status_t *P, top_status_t *Q)
259 {
260 /* We want to avoid unsigned->signed and truncation errors */
261 if (Q->ticks < P->ticks) return -1;
262 return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
263 }
264
mult_lvl_cmp(void * a,void * b)265 static int mult_lvl_cmp(void* a, void* b)
266 {
267 int i, cmp_val;
268
269 for (i = 0; i < SORT_DEPTH; i++) {
270 cmp_val = (*sort_function[i])(a, b);
271 if (cmp_val != 0)
272 break;
273 }
274 return inverted ? -cmp_val : cmp_val;
275 }
276
read_cpu_jiffy(FILE * fp,jiffy_counts_t * p_jif)277 static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
278 {
279 #if !ENABLE_FEATURE_TOP_SMP_CPU
280 static const char fmt[] ALIGN1 = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
281 #else
282 static const char fmt[] ALIGN1 = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
283 #endif
284 int ret;
285
286 if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
287 return 0;
288 ret = sscanf(line_buf, fmt,
289 &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
290 &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
291 &p_jif->steal);
292 if (ret >= 4) {
293 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
294 + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
295 /* procps 2.x does not count iowait as busy time */
296 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
297 }
298
299 return ret;
300 }
301
get_jiffy_counts(void)302 static void get_jiffy_counts(void)
303 {
304 FILE* fp = xfopen_for_read("stat");
305
306 /* We need to parse cumulative counts even if SMP CPU display is on,
307 * they are used to calculate per process CPU% */
308 prev_jif = cur_jif;
309 if (read_cpu_jiffy(fp, &cur_jif) < 4)
310 bb_error_msg_and_die("can't read '%s'", "/proc/stat");
311
312 #if !ENABLE_FEATURE_TOP_SMP_CPU
313 fclose(fp);
314 return;
315 #else
316 if (!smp_cpu_info) {
317 fclose(fp);
318 return;
319 }
320
321 if (!num_cpus) {
322 /* First time here. How many CPUs?
323 * There will be at least 1 /proc/stat line with cpu%d
324 */
325 while (1) {
326 cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
327 if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
328 break;
329 num_cpus++;
330 }
331 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
332 smp_cpu_info = 0;
333
334 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
335
336 /* Otherwise the first per cpu display shows all 100% idles */
337 usleep(50000);
338 } else { /* Non first time invocation */
339 jiffy_counts_t *tmp;
340 int i;
341
342 /* First switch the sample pointers: no need to copy */
343 tmp = cpu_prev_jif;
344 cpu_prev_jif = cpu_jif;
345 cpu_jif = tmp;
346
347 /* Get the new samples */
348 for (i = 0; i < num_cpus; i++)
349 read_cpu_jiffy(fp, &cpu_jif[i]);
350 }
351 #endif
352 fclose(fp);
353 }
354
do_stats(void)355 static void do_stats(void)
356 {
357 top_status_t *cur;
358 pid_t pid;
359 int n;
360 unsigned i, last_i;
361 struct save_hist *new_hist;
362
363 get_jiffy_counts();
364 total_pcpu = 0;
365 /* total_vsz = 0; */
366 new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
367 /*
368 * Make a pass through the data to get stats.
369 */
370 /* hist_iterations = 0; */
371 i = 0;
372 for (n = 0; n < ntop; n++) {
373 cur = top + n;
374
375 /*
376 * Calculate time in cur process. Time is sum of user time
377 * and system time
378 */
379 pid = cur->pid;
380 new_hist[n].ticks = cur->ticks;
381 new_hist[n].pid = pid;
382
383 /* find matching entry from previous pass */
384 cur->pcpu = 0;
385 /* do not start at index 0, continue at last used one
386 * (brought hist_iterations from ~14000 down to 172) */
387 last_i = i;
388 if (prev_hist_count) do {
389 if (prev_hist[i].pid == pid) {
390 cur->pcpu = cur->ticks - prev_hist[i].ticks;
391 total_pcpu += cur->pcpu;
392 break;
393 }
394 i = (i+1) % prev_hist_count;
395 /* hist_iterations++; */
396 } while (i != last_i);
397 /* total_vsz += cur->vsz; */
398 }
399
400 /*
401 * Save cur frame's information.
402 */
403 free(prev_hist);
404 prev_hist = new_hist;
405 prev_hist_count = ntop;
406 }
407
408 #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
409
410 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
411 /* formats 7 char string (8 with terminating NUL) */
fmt_100percent_8(char pbuf[8],unsigned value,unsigned total)412 static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
413 {
414 unsigned t;
415 if (value >= total) { /* 100% ? */
416 strcpy(pbuf, " 100% ");
417 return pbuf;
418 }
419 /* else generate " [N/space]N.N% " string */
420 value = 1000 * value / total;
421 t = value / 100;
422 value = value % 100;
423 pbuf[0] = ' ';
424 pbuf[1] = t ? t + '0' : ' ';
425 pbuf[2] = '0' + (value / 10);
426 pbuf[3] = '.';
427 pbuf[4] = '0' + (value % 10);
428 pbuf[5] = '%';
429 pbuf[6] = ' ';
430 pbuf[7] = '\0';
431 return pbuf;
432 }
433 #endif
434
435 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
display_cpus(int scr_width,char * scrbuf,int * lines_rem_p)436 static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
437 {
438 /*
439 * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
440 */
441 unsigned total_diff;
442 jiffy_counts_t *p_jif, *p_prev_jif;
443 int i;
444 # if ENABLE_FEATURE_TOP_SMP_CPU
445 int n_cpu_lines;
446 # endif
447
448 /* using (unsigned) casts to make operations cheaper */
449 # define CALC_TOTAL_DIFF do { \
450 total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
451 if (total_diff == 0) total_diff = 1; \
452 } while (0)
453
454 # if ENABLE_FEATURE_TOP_DECIMALS
455 # define CALC_STAT(xxx) char xxx[8]
456 # define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
457 # define FMT "%s"
458 # else
459 # define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
460 # define SHOW_STAT(xxx) xxx
461 # define FMT "%4u%% "
462 # endif
463
464 # if !ENABLE_FEATURE_TOP_SMP_CPU
465 {
466 i = 1;
467 p_jif = &cur_jif;
468 p_prev_jif = &prev_jif;
469 # else
470 /* Loop thru CPU(s) */
471 n_cpu_lines = smp_cpu_info ? num_cpus : 1;
472 if (n_cpu_lines > *lines_rem_p)
473 n_cpu_lines = *lines_rem_p;
474
475 for (i = 0; i < n_cpu_lines; i++) {
476 p_jif = &cpu_jif[i];
477 p_prev_jif = &cpu_prev_jif[i];
478 # endif
479 CALC_TOTAL_DIFF;
480
481 { /* Need a block: CALC_STAT are declarations */
482 CALC_STAT(usr);
483 CALC_STAT(sys);
484 CALC_STAT(nic);
485 CALC_STAT(idle);
486 CALC_STAT(iowait);
487 CALC_STAT(irq);
488 CALC_STAT(softirq);
489 /*CALC_STAT(steal);*/
490
491 snprintf(scrbuf, scr_width,
492 /* Barely fits in 79 chars when in "decimals" mode. */
493 # if ENABLE_FEATURE_TOP_SMP_CPU
494 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
495 (smp_cpu_info ? utoa(i) : ""),
496 # else
497 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
498 # endif
499 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
500 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
501 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
502 /* I doubt anyone wants to know it */
503 );
504 puts(scrbuf);
505 }
506 }
507 # undef SHOW_STAT
508 # undef CALC_STAT
509 # undef FMT
510 *lines_rem_p -= i;
511 }
512 #else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
513 # define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
514 #endif
515
516 enum {
517 MI_MEMTOTAL,
518 MI_MEMFREE,
519 MI_MEMSHARED,
520 MI_SHMEM,
521 MI_BUFFERS,
522 MI_CACHED,
523 MI_SWAPTOTAL,
524 MI_SWAPFREE,
525 MI_DIRTY,
526 MI_WRITEBACK,
527 MI_ANONPAGES,
528 MI_MAPPED,
529 MI_SLAB,
530 MI_MAX
531 };
532
533 static void parse_meminfo(unsigned long meminfo[MI_MAX])
534 {
535 static const char fields[] ALIGN1 =
536 "MemTotal\0"
537 "MemFree\0"
538 "MemShared\0"
539 "Shmem\0"
540 "Buffers\0"
541 "Cached\0"
542 "SwapTotal\0"
543 "SwapFree\0"
544 "Dirty\0"
545 "Writeback\0"
546 "AnonPages\0"
547 "Mapped\0"
548 "Slab\0";
549 char buf[60]; /* actual lines we expect are ~30 chars or less */
550 FILE *f;
551 int i;
552
553 memset(meminfo, 0, sizeof(meminfo[0]) * MI_MAX);
554 f = xfopen_for_read("meminfo");
555 while (fgets(buf, sizeof(buf), f) != NULL) {
556 char *c = strchr(buf, ':');
557 if (!c)
558 continue;
559 *c = '\0';
560 i = index_in_strings(fields, buf);
561 if (i >= 0)
562 meminfo[i] = strtoul(c+1, NULL, 10);
563 }
564 fclose(f);
565 }
566
567 static unsigned long display_header(int scr_width, int *lines_rem_p)
568 {
569 char scrbuf[100]; /* [80] was a bit too low on 8Gb ram box */
570 char *buf;
571 unsigned long meminfo[MI_MAX];
572
573 parse_meminfo(meminfo);
574
575 /* Output memory info */
576 if (scr_width > (int)sizeof(scrbuf))
577 scr_width = sizeof(scrbuf);
578 snprintf(scrbuf, scr_width,
579 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
580 meminfo[MI_MEMTOTAL] - meminfo[MI_MEMFREE],
581 meminfo[MI_MEMFREE],
582 meminfo[MI_MEMSHARED] + meminfo[MI_SHMEM],
583 meminfo[MI_BUFFERS],
584 meminfo[MI_CACHED]);
585 /* Go to top & clear to the end of screen */
586 printf(OPT_BATCH_MODE ? "%s\n" : ESC"[H" ESC"[J" "%s\n", scrbuf);
587 (*lines_rem_p)--;
588
589 /* Display CPU time split as percentage of total time.
590 * This displays either a cumulative line or one line per CPU.
591 */
592 display_cpus(scr_width, scrbuf, lines_rem_p);
593
594 /* Read load average as a string */
595 buf = stpcpy(scrbuf, "Load average: ");
596 open_read_close("loadavg", buf, sizeof(scrbuf) - sizeof("Load average: "));
597 scrbuf[scr_width - 1] = '\0';
598 strchrnul(buf, '\n')[0] = '\0';
599 puts(scrbuf);
600 (*lines_rem_p)--;
601
602 return meminfo[MI_MEMTOTAL];
603 }
604
605 static NOINLINE void display_process_list(int lines_rem, int scr_width)
606 {
607 enum {
608 BITS_PER_INT = sizeof(int) * 8
609 };
610
611 top_status_t *s;
612 unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
613 /* xxx_shift and xxx_scale variables allow us to replace
614 * expensive divides with multiply and shift */
615 unsigned pmem_shift, pmem_scale, pmem_half;
616 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
617 unsigned tmp_unsigned;
618 unsigned pcpu_shift, pcpu_scale, pcpu_half;
619 unsigned busy_jifs;
620 #endif
621
622 /* what info of the processes is shown */
623 printf(OPT_BATCH_MODE ? "%.*s" : ESC"[7m" "%.*s" ESC"[m", scr_width,
624 " PID PPID USER STAT VSZ %VSZ"
625 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
626 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
627 " COMMAND");
628 lines_rem--;
629
630 #if ENABLE_FEATURE_TOP_DECIMALS
631 # define UPSCALE 1000
632 # define CALC_STAT(name, val) div_t name = div((val), 10)
633 # define SHOW_STAT(name) name.quot, '0'+name.rem
634 # define FMT "%3u.%c"
635 #else
636 # define UPSCALE 100
637 # define CALC_STAT(name, val) unsigned name = (val)
638 # define SHOW_STAT(name) name
639 # define FMT "%4u%%"
640 #endif
641 /*
642 * %VSZ = s->vsz/MemTotal
643 */
644 pmem_shift = BITS_PER_INT-11;
645 pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
646 /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
647 while (pmem_scale >= 512) {
648 pmem_scale /= 4;
649 pmem_shift -= 2;
650 }
651 pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
652 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
653 busy_jifs = cur_jif.busy - prev_jif.busy;
654 /* This happens if there were lots of short-lived processes
655 * between two top updates (e.g. compilation) */
656 if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
657
658 /*
659 * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
660 * (pcpu is delta of sys+user time between samples)
661 */
662 /* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
663 * in 0..~64000 range (HZ*update_interval).
664 * we assume that unsigned is at least 32-bit.
665 */
666 pcpu_shift = 6;
667 pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
668 if (pcpu_scale == 0)
669 pcpu_scale = 1;
670 while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
671 pcpu_scale *= 4;
672 pcpu_shift += 2;
673 }
674 tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
675 if (tmp_unsigned != 0)
676 pcpu_scale /= tmp_unsigned;
677 /* we want (s->pcpu * pcpu_scale) to never overflow */
678 while (pcpu_scale >= 1024) {
679 pcpu_scale /= 4;
680 pcpu_shift -= 2;
681 }
682 pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
683 /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
684 #endif
685
686 /* Ok, all preliminary data is ready, go through the list */
687 scr_width += 2; /* account for leading '\n' and trailing NUL */
688 if (lines_rem > ntop - G_scroll_ofs)
689 lines_rem = ntop - G_scroll_ofs;
690 s = top + G_scroll_ofs;
691 while (--lines_rem >= 0) {
692 char vsz_str_buf[8];
693 unsigned col;
694
695 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
696 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
697 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
698 #endif
699
700 smart_ulltoa5(s->vsz, vsz_str_buf, " mgtpezy");
701 /* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
702 col = snprintf(line_buf, scr_width,
703 "\n" "%5u%6u %-8.8s %s %.5s" FMT
704 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
705 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
706 " ",
707 s->pid, s->ppid, get_cached_username(s->uid),
708 s->state, vsz_str_buf,
709 SHOW_STAT(pmem)
710 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
711 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
712 );
713 if ((int)(scr_width - col) > 1)
714 read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
715 fputs_stdout(line_buf);
716 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
717 cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
718 s++;
719 }
720 /* printf(" %d", hist_iterations); */
721 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
722 fflush_all();
723 }
724 #undef UPSCALE
725 #undef SHOW_STAT
726 #undef CALC_STAT
727 #undef FMT
728
729 static void clearmems(void)
730 {
731 clear_username_cache();
732 free(top);
733 top = NULL;
734 }
735
736 #if ENABLE_FEATURE_TOP_INTERACTIVE
737 static void reset_term(void)
738 {
739 if (!OPT_BATCH_MODE)
740 tcsetattr_stdin_TCSANOW(&initial_settings);
741 }
742
743 static void sig_catcher(int sig)
744 {
745 reset_term();
746 kill_myself_with_sig(sig);
747 }
748 #endif /* FEATURE_TOP_INTERACTIVE */
749
750 /*
751 * TOPMEM support
752 */
753
754 typedef unsigned long mem_t;
755
756 typedef struct topmem_status_t {
757 unsigned pid;
758 char comm[COMM_LEN];
759 /* vsz doesn't count /dev/xxx mappings except /dev/zero */
760 mem_t vsz ;
761 mem_t vszrw ;
762 mem_t rss ;
763 mem_t rss_sh ;
764 mem_t dirty ;
765 mem_t dirty_sh;
766 mem_t stack ;
767 } topmem_status_t;
768
769 enum { NUM_SORT_FIELD = 7 };
770
771 #define topmem ((topmem_status_t*)top)
772
773 #if ENABLE_FEATURE_TOPMEM
774
775 static int topmem_sort(char *a, char *b)
776 {
777 int n;
778 mem_t l, r;
779
780 n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
781 l = *(mem_t*)(a + n);
782 r = *(mem_t*)(b + n);
783 if (l == r) {
784 l = ((topmem_status_t*)a)->dirty;
785 r = ((topmem_status_t*)b)->dirty;
786 }
787 /* We want to avoid unsigned->signed and truncation errors */
788 /* l>r: -1, l=r: 0, l<r: 1 */
789 n = (l > r) ? -1 : (l != r);
790 return inverted ? -n : n;
791 }
792
793 /* display header info (meminfo / loadavg) */
794 static void display_topmem_header(int scr_width, int *lines_rem_p)
795 {
796 unsigned long meminfo[MI_MAX];
797
798 parse_meminfo(meminfo);
799
800 snprintf(line_buf, LINE_BUF_SIZE,
801 "Mem total:%lu anon:%lu map:%lu free:%lu",
802 meminfo[MI_MEMTOTAL],
803 meminfo[MI_ANONPAGES],
804 meminfo[MI_MAPPED],
805 meminfo[MI_MEMFREE]);
806 printf(OPT_BATCH_MODE ? "%.*s\n" : ESC"[H" ESC"[J" "%.*s\n", scr_width, line_buf);
807
808 snprintf(line_buf, LINE_BUF_SIZE,
809 " slab:%lu buf:%lu cache:%lu dirty:%lu write:%lu",
810 meminfo[MI_SLAB],
811 meminfo[MI_BUFFERS],
812 meminfo[MI_CACHED],
813 meminfo[MI_DIRTY],
814 meminfo[MI_WRITEBACK]);
815 printf("%.*s\n", scr_width, line_buf);
816
817 snprintf(line_buf, LINE_BUF_SIZE,
818 "Swap total:%lu free:%lu", // TODO: % used?
819 meminfo[MI_SWAPTOTAL],
820 meminfo[MI_SWAPFREE]);
821 printf("%.*s\n", scr_width, line_buf);
822
823 (*lines_rem_p) -= 3;
824 }
825
826 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
827 {
828 /* see http://en.wikipedia.org/wiki/Tera */
829 smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
830 }
831
832 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
833 {
834 #define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
835 #define MIN_WIDTH sizeof(HDR_STR)
836 const topmem_status_t *s = topmem + G_scroll_ofs;
837 char *cp, ch;
838
839 display_topmem_header(scr_width, &lines_rem);
840
841 strcpy(line_buf, HDR_STR " COMMAND");
842 /* Mark the ^FIELD^ we sort by */
843 cp = &line_buf[5 + sort_field * 6];
844 ch = "^_"[inverted];
845 cp[6] = ch;
846 do *cp++ = ch; while (*cp == ' ');
847
848 printf(OPT_BATCH_MODE ? "%.*s" : ESC"[7m" "%.*s" ESC"[m", scr_width, line_buf);
849 lines_rem--;
850
851 if (lines_rem > ntop - G_scroll_ofs)
852 lines_rem = ntop - G_scroll_ofs;
853 while (--lines_rem >= 0) {
854 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
855 ulltoa6_and_space(s->pid , &line_buf[0*6]);
856 ulltoa6_and_space(s->vsz , &line_buf[1*6]);
857 ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
858 ulltoa6_and_space(s->rss , &line_buf[3*6]);
859 ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
860 ulltoa6_and_space(s->dirty , &line_buf[5*6]);
861 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
862 ulltoa6_and_space(s->stack , &line_buf[7*6]);
863 line_buf[8*6] = '\0';
864 if (scr_width > (int)MIN_WIDTH) {
865 read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
866 }
867 printf("\n""%.*s", scr_width, line_buf);
868 s++;
869 }
870 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
871 fflush_all();
872 #undef HDR_STR
873 #undef MIN_WIDTH
874 }
875
876 #else
877 void display_topmem_process_list(int lines_rem, int scr_width);
878 int topmem_sort(char *a, char *b);
879 #endif /* TOPMEM */
880
881 /*
882 * end TOPMEM support
883 */
884
885 enum {
886 TOP_MASK = 0
887 | PSSCAN_PID
888 | PSSCAN_PPID
889 | PSSCAN_VSZ
890 | PSSCAN_STIME
891 | PSSCAN_UTIME
892 | PSSCAN_STATE
893 | PSSCAN_COMM
894 | PSSCAN_CPU
895 | PSSCAN_UIDGID,
896 TOPMEM_MASK = 0
897 | PSSCAN_PID
898 | PSSCAN_SMAPS
899 | PSSCAN_COMM,
900 EXIT_MASK = 0,
901 NO_RESCAN_MASK = (unsigned)-1,
902 };
903
904 #if ENABLE_FEATURE_TOP_INTERACTIVE
905 static unsigned handle_input(unsigned scan_mask, duration_t interval)
906 {
907 if (option_mask32 & OPT_EOF) {
908 /* EOF on stdin ("top </dev/null") */
909 sleep_for_duration(interval);
910 return scan_mask;
911 }
912
913 while (1) {
914 int32_t c;
915
916 c = read_key(STDIN_FILENO, G.kbd_input, interval * 1000);
917 if (c == -1 && errno != EAGAIN) {
918 /* error/EOF */
919 option_mask32 |= OPT_EOF;
920 break;
921 }
922 interval = 0;
923
924 if (c == initial_settings.c_cc[VINTR])
925 return EXIT_MASK;
926 if (c == initial_settings.c_cc[VEOF])
927 return EXIT_MASK;
928
929 if (c == KEYCODE_UP) {
930 G_scroll_ofs--;
931 goto normalize_ofs;
932 }
933 if (c == KEYCODE_DOWN) {
934 G_scroll_ofs++;
935 goto normalize_ofs;
936 }
937 if (c == KEYCODE_HOME) {
938 G_scroll_ofs = 0;
939 goto normalize_ofs;
940 }
941 if (c == KEYCODE_END) {
942 G_scroll_ofs = ntop - G.lines / 2;
943 goto normalize_ofs;
944 }
945 if (c == KEYCODE_PAGEUP) {
946 G_scroll_ofs -= G.lines / 2;
947 goto normalize_ofs;
948 }
949 if (c == KEYCODE_PAGEDOWN) {
950 G_scroll_ofs += G.lines / 2;
951 normalize_ofs:
952 if (G_scroll_ofs >= ntop)
953 G_scroll_ofs = ntop - 1;
954 if (G_scroll_ofs < 0)
955 G_scroll_ofs = 0;
956 return NO_RESCAN_MASK;
957 }
958
959 c |= 0x20; /* lowercase */
960 if (c == 'q')
961 return EXIT_MASK;
962
963 if (c == 'n') {
964 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
965 sort_function[0] = pid_sort;
966 continue;
967 }
968 if (c == 'm') {
969 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
970 sort_function[0] = mem_sort;
971 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
972 sort_function[1] = pcpu_sort;
973 sort_function[2] = time_sort;
974 # endif
975 continue;
976 }
977 # if ENABLE_FEATURE_SHOW_THREADS
978 if (c == 'h'
979 IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
980 ) {
981 scan_mask ^= PSSCAN_TASKS;
982 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
983 free(prev_hist);
984 prev_hist = NULL;
985 prev_hist_count = 0;
986 # endif
987 continue;
988 }
989 # endif
990 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
991 if (c == 'p') {
992 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
993 sort_function[0] = pcpu_sort;
994 sort_function[1] = mem_sort;
995 sort_function[2] = time_sort;
996 continue;
997 }
998 if (c == 't') {
999 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
1000 sort_function[0] = time_sort;
1001 sort_function[1] = mem_sort;
1002 sort_function[2] = pcpu_sort;
1003 continue;
1004 }
1005 # if ENABLE_FEATURE_TOPMEM
1006 if (c == 's') {
1007 scan_mask = TOPMEM_MASK;
1008 sort_field = (sort_field + 1) % NUM_SORT_FIELD;
1009 free(prev_hist);
1010 prev_hist = NULL;
1011 prev_hist_count = 0;
1012 continue;
1013 }
1014 # endif
1015 if (c == 'r') {
1016 inverted ^= 1;
1017 continue;
1018 }
1019 # if ENABLE_FEATURE_TOP_SMP_CPU
1020 /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
1021 if (c == 'c' || c == '1') {
1022 /* User wants to toggle per cpu <> aggregate */
1023 if (smp_cpu_info) {
1024 free(cpu_prev_jif);
1025 free(cpu_jif);
1026 cpu_jif = &cur_jif;
1027 cpu_prev_jif = &prev_jif;
1028 } else {
1029 /* Prepare for xrealloc() */
1030 cpu_jif = cpu_prev_jif = NULL;
1031 }
1032 num_cpus = 0;
1033 smp_cpu_info = !smp_cpu_info;
1034 get_jiffy_counts();
1035 continue;
1036 }
1037 # endif
1038 # endif
1039 break; /* unknown key -> force refresh */
1040 }
1041
1042 return scan_mask;
1043 }
1044 #endif
1045
1046 //usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
1047 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
1048 //usage:#else
1049 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
1050 //usage:#endif
1051 //usage:#define top_trivial_usage
1052 //usage: "[-b"IF_FEATURE_TOPMEM("m")IF_FEATURE_SHOW_THREADS("H")"]"
1053 //usage: " [-n COUNT] [-d SECONDS]"
1054 //usage:#define top_full_usage "\n\n"
1055 //usage: "Show a view of process activity in real time."
1056 //usage: "\n""Read the status of all processes from /proc each SECONDS"
1057 //usage: "\n""and show a screenful of them."
1058 //usage: "\n"
1059 //usage: IF_FEATURE_TOP_INTERACTIVE(
1060 //usage: "Keys:"
1061 //usage: "\n"" N/M"
1062 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/P")
1063 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/T")
1064 //usage: ": " IF_FEATURE_TOPMEM("show CPU usage, ") "sort by pid/mem"
1065 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/cpu")
1066 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/time")
1067 //usage: IF_FEATURE_TOPMEM(
1068 //usage: "\n"" S: show memory"
1069 //usage: )
1070 //usage: "\n"" R: reverse sort"
1071 //usage: IF_SHOW_THREADS_OR_TOP_SMP(
1072 //usage: "\n"" "
1073 //usage: IF_FEATURE_SHOW_THREADS("H: toggle threads")
1074 //usage: IF_FEATURE_SHOW_THREADS(IF_FEATURE_TOP_SMP_CPU(", "))
1075 //usage: IF_FEATURE_TOP_SMP_CPU("1: toggle SMP")
1076 //usage: )
1077 //usage: "\n"" Q,^C: exit"
1078 //usage: "\n""Options:"
1079 //usage: )
1080 //usage: "\n"" -b Batch mode"
1081 //usage: "\n"" -n N Exit after N iterations"
1082 //usage: "\n"" -d SEC Delay between updates"
1083 //usage: IF_FEATURE_TOPMEM(
1084 //usage: "\n"" -m Same as 's' key"
1085 //usage: )
1086 //usage: IF_FEATURE_SHOW_THREADS(
1087 //usage: "\n"" -H Show threads"
1088 //usage: )
1089
1090 /* Interactive testing:
1091 * echo sss | ./busybox top
1092 * - shows memory screen
1093 * echo sss | ./busybox top -bn1 >mem
1094 * - saves memory screen - the *whole* list, not first NROWS processes!
1095 * echo .m.s.s.s.s.s.s.q | ./busybox top -b >z
1096 * - saves several different screens, and exits
1097 *
1098 * TODO: -i STRING param as a better alternative?
1099 */
1100
1101 int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1102 int top_main(int argc UNUSED_PARAM, char **argv)
1103 {
1104 duration_t interval;
1105 int iterations;
1106 unsigned col;
1107 char *str_interval, *str_iterations;
1108 unsigned scan_mask = TOP_MASK;
1109
1110 INIT_G();
1111
1112 interval = 5; /* default update interval is 5 seconds */
1113 iterations = 0; /* infinite */
1114 #if ENABLE_FEATURE_TOP_SMP_CPU
1115 /*num_cpus = 0;*/
1116 /*smp_cpu_info = 0;*/ /* to start with show aggregate */
1117 cpu_jif = &cur_jif;
1118 cpu_prev_jif = &prev_jif;
1119 #endif
1120
1121 /* all args are options; -n NUM */
1122 make_all_argv_opts(argv); /* options can be specified w/o dash */
1123 col = getopt32(argv, "d:n:bHm", &str_interval, &str_iterations);
1124 /* NB: -m and -H are accepted even if not configured */
1125 #if ENABLE_FEATURE_TOPMEM
1126 if (col & OPT_m) /* -m (busybox specific) */
1127 scan_mask = TOPMEM_MASK;
1128 #endif
1129 if (col & OPT_d) {
1130 /* work around for "-d 1" -> "-d -1" done by make_all_argv_opts() */
1131 if (str_interval[0] == '-')
1132 str_interval++;
1133 interval = parse_duration_str(str_interval);
1134 /* Need to limit it to not overflow poll timeout */
1135 if (interval > INT_MAX / 1000)
1136 interval = INT_MAX / 1000;
1137 }
1138 if (col & OPT_n) {
1139 if (str_iterations[0] == '-')
1140 str_iterations++;
1141 iterations = xatou(str_iterations);
1142 }
1143 #if ENABLE_FEATURE_SHOW_THREADS
1144 if (col & OPT_H) {
1145 scan_mask |= PSSCAN_TASKS;
1146 }
1147 #endif
1148
1149 /* change to /proc */
1150 xchdir("/proc");
1151
1152 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1153 sort_function[0] = pcpu_sort;
1154 sort_function[1] = mem_sort;
1155 sort_function[2] = time_sort;
1156 #else
1157 sort_function[0] = mem_sort;
1158 #endif
1159
1160 if (OPT_BATCH_MODE) {
1161 option_mask32 |= OPT_EOF;
1162 }
1163 #if ENABLE_FEATURE_TOP_INTERACTIVE
1164 else {
1165 /* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
1166 set_termios_to_raw(STDIN_FILENO, &initial_settings, TERMIOS_CLEAR_ISIG);
1167 die_func = reset_term;
1168 }
1169
1170 bb_signals(BB_FATAL_SIGS, sig_catcher);
1171
1172 /* Eat initial input, if any */
1173 scan_mask = handle_input(scan_mask, 0);
1174 #endif
1175
1176 while (scan_mask != EXIT_MASK) {
1177 IF_FEATURE_TOP_INTERACTIVE(unsigned new_mask;)
1178 procps_status_t *p = NULL;
1179
1180 if (OPT_BATCH_MODE) {
1181 G.lines = INT_MAX;
1182 col = LINE_BUF_SIZE - 2; /* +2 bytes for '\n', NUL */
1183 } else {
1184 G.lines = 24; /* default */
1185 col = 79;
1186 /* We output to stdout, we need size of stdout (not stdin)! */
1187 get_terminal_width_height(STDOUT_FILENO, &col, &G.lines);
1188 if (G.lines < 5 || col < 10) {
1189 sleep_for_duration(interval);
1190 continue;
1191 }
1192 if (col > LINE_BUF_SIZE - 2)
1193 col = LINE_BUF_SIZE - 2;
1194 }
1195
1196 /* read process IDs & status for all the processes */
1197 ntop = 0;
1198 while ((p = procps_scan(p, scan_mask)) != NULL) {
1199 int n;
1200
1201 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1202 n = ntop;
1203 top = xrealloc_vector(top, 6, ntop++);
1204 top[n].pid = p->pid;
1205 top[n].ppid = p->ppid;
1206 top[n].vsz = p->vsz;
1207 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1208 top[n].ticks = p->stime + p->utime;
1209 #endif
1210 top[n].uid = p->uid;
1211 strcpy(top[n].state, p->state);
1212 strcpy(top[n].comm, p->comm);
1213 #if ENABLE_FEATURE_TOP_SMP_PROCESS
1214 top[n].last_seen_on_cpu = p->last_seen_on_cpu;
1215 #endif
1216 }
1217 #if ENABLE_FEATURE_TOPMEM
1218 else { /* TOPMEM */
1219 if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
1220 continue; /* kernel threads are ignored */
1221 n = ntop;
1222 /* No bug here - top and topmem are the same */
1223 top = xrealloc_vector(topmem, 6, ntop++);
1224 strcpy(topmem[n].comm, p->comm);
1225 topmem[n].pid = p->pid;
1226 topmem[n].vsz = p->smaps.mapped_rw + p->smaps.mapped_ro;
1227 topmem[n].vszrw = p->smaps.mapped_rw;
1228 topmem[n].rss_sh = p->smaps.shared_clean + p->smaps.shared_dirty;
1229 topmem[n].rss = p->smaps.private_clean + p->smaps.private_dirty + topmem[n].rss_sh;
1230 topmem[n].dirty = p->smaps.private_dirty + p->smaps.shared_dirty;
1231 topmem[n].dirty_sh = p->smaps.shared_dirty;
1232 topmem[n].stack = p->smaps.stack;
1233 }
1234 #endif
1235 } /* end of "while we read /proc" */
1236 if (ntop == 0) {
1237 bb_simple_error_msg("no process info in /proc");
1238 break;
1239 }
1240
1241 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1242 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1243 if (!prev_hist_count) {
1244 do_stats();
1245 usleep(100000);
1246 clearmems();
1247 continue;
1248 }
1249 do_stats();
1250 /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
1251 qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
1252 #else
1253 qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1254 #endif
1255 }
1256 #if ENABLE_FEATURE_TOPMEM
1257 else { /* TOPMEM */
1258 qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1259 }
1260 #endif
1261 IF_FEATURE_TOP_INTERACTIVE(display:)
1262 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1263 display_process_list(G.lines, col);
1264 }
1265 #if ENABLE_FEATURE_TOPMEM
1266 else { /* TOPMEM */
1267 display_topmem_process_list(G.lines, col);
1268 }
1269 #endif
1270 if (iterations >= 0 && !--iterations)
1271 break;
1272 #if !ENABLE_FEATURE_TOP_INTERACTIVE
1273 clearmems();
1274 sleep_for_duration(interval);
1275 #else
1276 new_mask = handle_input(scan_mask, interval);
1277 if (new_mask == NO_RESCAN_MASK)
1278 goto display;
1279 scan_mask = new_mask;
1280 clearmems();
1281 #endif
1282 } /* end of "while (not Q)" */
1283
1284 bb_putchar('\n');
1285 #if ENABLE_FEATURE_TOP_INTERACTIVE
1286 reset_term();
1287 #endif
1288 if (ENABLE_FEATURE_CLEAN_UP) {
1289 clearmems();
1290 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1291 free(prev_hist);
1292 #endif
1293 }
1294 return EXIT_SUCCESS;
1295 }
1296