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>
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
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
31 * Licensed under GPLv2, see file LICENSE in this source tree.
33 /* How to snapshot /proc for debugging top problems:
34 * for f in /proc/[0-9]*""/stat; do
39 * cp /proc/stat /proc/meminfo /proc/loadavg .
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
49 * cp stat meminfo loadavg proc
50 * chroot . ./top -bn1 >top1.out
53 //config: bool "top (18 kb)"
56 //config: The top program provides a dynamic real-time view of a running
59 //config:config FEATURE_TOP_INTERACTIVE
60 //config: bool "Accept keyboard commands"
62 //config: depends on TOP
64 //config: Without this, top will only refresh display every 5 seconds.
65 //config: No keyboard commands will work, only ^C to terminate.
67 //config:config FEATURE_TOP_CPU_USAGE_PERCENTAGE
68 //config: bool "Show CPU per-process usage percentage"
70 //config: depends on TOP
72 //config: Make top display CPU usage for each process.
73 //config: This adds about 2k.
75 //config:config FEATURE_TOP_CPU_GLOBAL_PERCENTS
76 //config: bool "Show CPU global usage percentage"
78 //config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
80 //config: Makes top display "CPU: NN% usr NN% sys..." line.
81 //config: This adds about 0.5k.
83 //config:config FEATURE_TOP_SMP_CPU
84 //config: bool "SMP CPU usage display ('c' key)"
86 //config: depends on FEATURE_TOP_CPU_GLOBAL_PERCENTS
88 //config: Allow 'c' key to switch between individual/cumulative CPU stats
89 //config: This adds about 0.5k.
91 //config:config FEATURE_TOP_DECIMALS
92 //config: bool "Show 1/10th of a percent in CPU/mem statistics"
94 //config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
96 //config: Show 1/10th of a percent in CPU/mem statistics.
97 //config: This adds about 0.3k.
99 //config:config FEATURE_TOP_SMP_PROCESS
100 //config: bool "Show CPU process runs on ('j' field)"
102 //config: depends on TOP
104 //config: Show CPU where process was last found running on.
105 //config: This is the 'j' field.
107 //config:config FEATURE_TOPMEM
108 //config: bool "Topmem command ('s' key)"
110 //config: depends on TOP
112 //config: Enable 's' in top (gives lots of memory info).
114 //applet:IF_TOP(APPLET(top, BB_DIR_USR_BIN, BB_SUID_DROP))
116 //kbuild:lib-$(CONFIG_TOP) += top.o
122 typedef struct top_status_t {
124 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
126 unsigned pcpu; /* delta of ticks */
132 #if ENABLE_FEATURE_TOP_SMP_PROCESS
133 int last_seen_on_cpu;
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;
145 /* This structure stores some critical information from one frame to
146 the next. Used for finding deltas. */
147 typedef struct save_hist {
152 typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
155 enum { SORT_DEPTH = 3 };
157 /* Screens wider than this are unlikely */
158 enum { LINE_BUF_SIZE = 512 - 64 };
164 #if ENABLE_FEATURE_TOPMEM
167 #if ENABLE_FEATURE_TOP_SMP_CPU
168 smallint smp_cpu_info; /* one/many cpu info lines? */
170 unsigned lines; /* screen height */
171 #if ENABLE_FEATURE_TOP_INTERACTIVE
172 struct termios initial_settings;
174 #define G_scroll_ofs G.scroll_ofs
176 #define G_scroll_ofs 0
178 #if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
179 cmp_funcp sort_function[1];
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; */
187 /* unsigned long total_vsz; */
189 #if ENABLE_FEATURE_TOP_SMP_CPU
190 /* Per CPU samples: current and last */
191 jiffy_counts_t *cpu_jif, *cpu_prev_jif;
194 #if ENABLE_FEATURE_TOP_INTERACTIVE
195 char kbd_input[KEYCODE_BUFFER_SIZE];
197 char line_buf[LINE_BUF_SIZE];
199 #define G (*ptr_to_globals)
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); \
227 OPT_EOF = (1 << 5), /* pseudo: "we saw EOF in stdin" */
229 #define OPT_BATCH_MODE (option_mask32 & OPT_b)
232 #if ENABLE_FEATURE_TOP_INTERACTIVE
233 static int pid_sort(top_status_t *P, top_status_t *Q)
235 /* Buggy wrt pids with high bit set */
236 /* (linux pids are in [1..2^15-1]) */
237 return (Q->pid - P->pid);
241 static int mem_sort(top_status_t *P, top_status_t *Q)
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 > */
249 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
251 static int pcpu_sort(top_status_t *P, top_status_t *Q)
253 /* Buggy wrt ticks with high bit set */
254 /* Affects only processes for which ticks overflow */
255 return (int)Q->pcpu - (int)P->pcpu;
258 static int time_sort(top_status_t *P, top_status_t *Q)
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 > */
265 static int mult_lvl_cmp(void* a, void* b)
269 for (i = 0; i < SORT_DEPTH; i++) {
270 cmp_val = (*sort_function[i])(a, b);
274 return inverted ? -cmp_val : cmp_val;
277 static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
279 #if !ENABLE_FEATURE_TOP_SMP_CPU
280 static const char fmt[] ALIGN1 = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
282 static const char fmt[] ALIGN1 = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
286 if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
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,
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;
302 static void get_jiffy_counts(void)
304 FILE* fp = xfopen_for_read("stat");
306 /* We need to parse cumulative counts even if SMP CPU display is on,
307 * they are used to calculate per process CPU% */
309 if (read_cpu_jiffy(fp, &cur_jif) < 4)
310 bb_error_msg_and_die("can't read '%s'", "/proc/stat");
312 #if !ENABLE_FEATURE_TOP_SMP_CPU
322 /* First time here. How many CPUs?
323 * There will be at least 1 /proc/stat line with cpu%d
326 cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
327 if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
331 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
334 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
336 /* Otherwise the first per cpu display shows all 100% idles */
338 } else { /* Non first time invocation */
342 /* First switch the sample pointers: no need to copy */
344 cpu_prev_jif = cpu_jif;
347 /* Get the new samples */
348 for (i = 0; i < num_cpus; i++)
349 read_cpu_jiffy(fp, &cpu_jif[i]);
355 static void do_stats(void)
361 struct save_hist *new_hist;
366 new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
368 * Make a pass through the data to get stats.
370 /* hist_iterations = 0; */
372 for (n = 0; n < ntop; n++) {
376 * Calculate time in cur process. Time is sum of user time
380 new_hist[n].ticks = cur->ticks;
381 new_hist[n].pid = pid;
383 /* find matching entry from previous pass */
385 /* do not start at index 0, continue at last used one
386 * (brought hist_iterations from ~14000 down to 172) */
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;
394 i = (i+1) % prev_hist_count;
395 /* hist_iterations++; */
396 } while (i != last_i);
397 /* total_vsz += cur->vsz; */
401 * Save cur frame's information.
404 prev_hist = new_hist;
405 prev_hist_count = ntop;
408 #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
410 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
411 /* formats 7 char string (8 with terminating NUL) */
412 static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
415 if (value >= total) { /* 100% ? */
416 strcpy(pbuf, " 100% ");
419 /* else generate " [N/space]N.N% " string */
420 value = 1000 * value / total;
424 pbuf[1] = t ? t + '0' : ' ';
425 pbuf[2] = '0' + (value / 10);
427 pbuf[4] = '0' + (value % 10);
435 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
436 static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
439 * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
442 jiffy_counts_t *p_jif, *p_prev_jif;
444 # if ENABLE_FEATURE_TOP_SMP_CPU
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; \
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)
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%% "
464 # if !ENABLE_FEATURE_TOP_SMP_CPU
468 p_prev_jif = &prev_jif;
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;
475 for (i = 0; i < n_cpu_lines; i++) {
477 p_prev_jif = &cpu_prev_jif[i];
481 { /* Need a block: CALC_STAT are declarations */
489 /*CALC_STAT(steal);*/
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) : ""),
497 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
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 */
512 #else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
513 # define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
533 static void parse_meminfo(unsigned long meminfo[MI_MAX])
535 static const char fields[] ALIGN1 =
549 char buf[60]; /* actual lines we expect are ~30 chars or less */
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, ':');
560 i = index_in_strings(fields, buf);
562 meminfo[i] = strtoul(c+1, NULL, 10);
567 static unsigned long display_header(int scr_width, int *lines_rem_p)
569 char scrbuf[100]; /* [80] was a bit too low on 8Gb ram box */
571 unsigned long meminfo[MI_MAX];
573 parse_meminfo(meminfo);
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],
582 meminfo[MI_MEMSHARED] + meminfo[MI_SHMEM],
585 /* Go to top & clear to the end of screen */
586 printf(OPT_BATCH_MODE ? "%s\n" : ESC"[H" ESC"[J" "%s\n", scrbuf);
589 /* Display CPU time split as percentage of total time.
590 * This displays either a cumulative line or one line per CPU.
592 display_cpus(scr_width, scrbuf, lines_rem_p);
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';
602 return meminfo[MI_MEMTOTAL];
605 static NOINLINE void display_process_list(int lines_rem, int scr_width)
608 BITS_PER_INT = sizeof(int) * 8
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;
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")
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"
637 # define CALC_STAT(name, val) unsigned name = (val)
638 # define SHOW_STAT(name) name
642 * %VSZ = s->vsz/MemTotal
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) {
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;
659 * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
660 * (pcpu is delta of sys+user time between samples)
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.
667 pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
670 while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
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) {
682 pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
683 /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
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) {
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);
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)
707 s->pid, s->ppid, get_cached_username(s->uid),
708 s->state, vsz_str_buf,
710 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
711 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
713 if ((int)(scr_width - col) > 1)
714 read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
715 fputs(line_buf, stdout);
716 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
717 cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
720 /* printf(" %d", hist_iterations); */
721 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
729 static void clearmems(void)
731 clear_username_cache();
736 #if ENABLE_FEATURE_TOP_INTERACTIVE
737 static void reset_term(void)
740 tcsetattr_stdin_TCSANOW(&initial_settings);
743 static void sig_catcher(int sig)
746 kill_myself_with_sig(sig);
748 #endif /* FEATURE_TOP_INTERACTIVE */
754 typedef unsigned long mem_t;
756 typedef struct topmem_status_t {
759 /* vsz doesn't count /dev/xxx mappings except /dev/zero */
769 enum { NUM_SORT_FIELD = 7 };
771 #define topmem ((topmem_status_t*)top)
773 #if ENABLE_FEATURE_TOPMEM
775 static int topmem_sort(char *a, char *b)
780 n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
781 l = *(mem_t*)(a + n);
782 r = *(mem_t*)(b + n);
784 l = ((topmem_status_t*)a)->dirty;
785 r = ((topmem_status_t*)b)->dirty;
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;
793 /* display header info (meminfo / loadavg) */
794 static void display_topmem_header(int scr_width, int *lines_rem_p)
796 unsigned long meminfo[MI_MAX];
798 parse_meminfo(meminfo);
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],
805 meminfo[MI_MEMFREE]);
806 printf(OPT_BATCH_MODE ? "%.*s\n" : ESC"[H" ESC"[J" "%.*s\n", scr_width, line_buf);
808 snprintf(line_buf, LINE_BUF_SIZE,
809 " slab:%lu buf:%lu cache:%lu dirty:%lu write:%lu",
814 meminfo[MI_WRITEBACK]);
815 printf("%.*s\n", scr_width, line_buf);
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);
826 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
828 /* see http://en.wikipedia.org/wiki/Tera */
829 smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
832 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
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;
839 display_topmem_header(scr_width, &lines_rem);
841 strcpy(line_buf, HDR_STR " COMMAND");
842 /* Mark the ^FIELD^ we sort by */
843 cp = &line_buf[5 + sort_field * 6];
846 do *cp++ = ch; while (*cp == ' ');
848 printf(OPT_BATCH_MODE ? "%.*s" : ESC"[7m" "%.*s" ESC"[m", scr_width, line_buf);
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);
867 printf("\n""%.*s", scr_width, line_buf);
870 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
877 void display_topmem_process_list(int lines_rem, int scr_width);
878 int topmem_sort(char *a, char *b);
901 NO_RESCAN_MASK = (unsigned)-1,
904 #if ENABLE_FEATURE_TOP_INTERACTIVE
905 static unsigned handle_input(unsigned scan_mask, duration_t interval)
907 if (option_mask32 & OPT_EOF) {
908 /* EOF on stdin ("top </dev/null") */
909 sleep_for_duration(interval);
916 c = read_key(STDIN_FILENO, G.kbd_input, interval * 1000);
917 if (c == -1 && errno != EAGAIN) {
919 option_mask32 |= OPT_EOF;
924 if (c == initial_settings.c_cc[VINTR])
926 if (c == initial_settings.c_cc[VEOF])
929 if (c == KEYCODE_UP) {
933 if (c == KEYCODE_DOWN) {
937 if (c == KEYCODE_HOME) {
941 if (c == KEYCODE_END) {
942 G_scroll_ofs = ntop - G.lines / 2;
945 if (c == KEYCODE_PAGEUP) {
946 G_scroll_ofs -= G.lines / 2;
949 if (c == KEYCODE_PAGEDOWN) {
950 G_scroll_ofs += G.lines / 2;
952 if (G_scroll_ofs >= ntop)
953 G_scroll_ofs = ntop - 1;
954 if (G_scroll_ofs < 0)
956 return NO_RESCAN_MASK;
959 c |= 0x20; /* lowercase */
964 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
965 sort_function[0] = pid_sort;
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;
977 # if ENABLE_FEATURE_SHOW_THREADS
979 IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
981 scan_mask ^= PSSCAN_TASKS;
982 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
990 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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;
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;
1005 # if ENABLE_FEATURE_TOPMEM
1007 scan_mask = TOPMEM_MASK;
1008 sort_field = (sort_field + 1) % NUM_SORT_FIELD;
1011 prev_hist_count = 0;
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 */
1027 cpu_prev_jif = &prev_jif;
1029 /* Prepare for xrealloc() */
1030 cpu_jif = cpu_prev_jif = NULL;
1033 smp_cpu_info = !smp_cpu_info;
1039 break; /* unknown key -> force refresh */
1046 //usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
1047 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
1049 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
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: "Provide 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 display a screenful of them."
1059 //usage: IF_FEATURE_TOP_INTERACTIVE(
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"
1070 //usage: "\n"" R: reverse sort"
1071 //usage: IF_SHOW_THREADS_OR_TOP_SMP(
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")
1077 //usage: "\n"" Q,^C: exit"
1078 //usage: "\n""Options:"
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"
1086 //usage: IF_FEATURE_SHOW_THREADS(
1087 //usage: "\n"" -H Show threads"
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
1098 * TODO: -i STRING param as a better alternative?
1101 int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1102 int top_main(int argc UNUSED_PARAM, char **argv)
1104 duration_t interval;
1107 char *str_interval, *str_iterations;
1108 unsigned scan_mask = TOP_MASK;
1112 interval = 5; /* default update interval is 5 seconds */
1113 iterations = 0; /* infinite */
1114 #if ENABLE_FEATURE_TOP_SMP_CPU
1116 /*smp_cpu_info = 0;*/ /* to start with show aggregate */
1118 cpu_prev_jif = &prev_jif;
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;
1130 /* work around for "-d 1" -> "-d -1" done by make_all_argv_opts() */
1131 if (str_interval[0] == '-')
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;
1139 if (str_iterations[0] == '-')
1141 iterations = xatou(str_iterations);
1143 #if ENABLE_FEATURE_SHOW_THREADS
1145 scan_mask |= PSSCAN_TASKS;
1149 /* change to /proc */
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;
1157 sort_function[0] = mem_sort;
1160 if (OPT_BATCH_MODE) {
1161 option_mask32 |= OPT_EOF;
1163 #if ENABLE_FEATURE_TOP_INTERACTIVE
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;
1170 bb_signals(BB_FATAL_SIGS, sig_catcher);
1172 /* Eat initial input, if any */
1173 scan_mask = handle_input(scan_mask, 0);
1176 while (scan_mask != EXIT_MASK) {
1177 IF_FEATURE_TOP_INTERACTIVE(unsigned new_mask;)
1178 procps_status_t *p = NULL;
1180 if (OPT_BATCH_MODE) {
1182 col = LINE_BUF_SIZE - 2; /* +2 bytes for '\n', NUL */
1184 G.lines = 24; /* default */
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);
1192 if (col > LINE_BUF_SIZE - 2)
1193 col = LINE_BUF_SIZE - 2;
1196 /* read process IDs & status for all the processes */
1198 while ((p = procps_scan(p, scan_mask)) != NULL) {
1201 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
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;
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;
1217 #if ENABLE_FEATURE_TOPMEM
1219 if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
1220 continue; /* kernel threads are ignored */
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;
1235 } /* end of "while we read /proc" */
1237 bb_simple_error_msg("no process info in /proc");
1241 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1242 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1243 if (!prev_hist_count) {
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);
1253 qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1256 #if ENABLE_FEATURE_TOPMEM
1258 qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1261 IF_FEATURE_TOP_INTERACTIVE(display:)
1262 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1263 display_process_list(G.lines, col);
1265 #if ENABLE_FEATURE_TOPMEM
1267 display_topmem_process_list(G.lines, col);
1270 if (iterations >= 0 && !--iterations)
1272 #if !ENABLE_FEATURE_TOP_INTERACTIVE
1274 sleep_for_duration(interval);
1276 new_mask = handle_input(scan_mask, interval);
1277 if (new_mask == NO_RESCAN_MASK)
1279 scan_mask = new_mask;
1282 } /* end of "while (not Q)" */
1285 #if ENABLE_FEATURE_TOP_INTERACTIVE
1288 if (ENABLE_FEATURE_CLEAN_UP) {
1290 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1294 return EXIT_SUCCESS;