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busybox/procps/top.c

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/* vi: set sw=4 ts=4: */
/*
* A tiny 'top' utility.
*
* This is written specifically for the linux /proc/<PID>/stat(m)
* files format.
*
* This reads the PIDs of all processes and their status and shows
* the status of processes (first ones that fit to screen) at given
* intervals.
*
* NOTES:
* - At startup this changes to /proc, all the reads are then
* relative to that.
*
* (C) Eero Tamminen <oak at welho dot com>
*
* Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
*
* Sept 2008: Vineet Gupta <vineet.gupta@arc.com>
* Added Support for reporting SMP Information
* - CPU where Process was last seen running
* (to see effect of sched_setaffinity() etc)
* - CPU Time Split (idle/IO/wait etc) PER CPU
*
* Copyright (c) 1992 Branko Lankester
* Copyright (c) 1992 Roger Binns
* Copyright (C) 1994-1996 Charles L. Blake.
* Copyright (C) 1992-1998 Michael K. Johnson
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
typedef struct top_status_t {
unsigned long vsz;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
unsigned long ticks;
unsigned pcpu; /* delta of ticks */
#endif
unsigned pid, ppid;
unsigned uid;
char state[4];
char comm[COMM_LEN];
#if ENABLE_FEATURE_TOP_SMP_PROCESS
int last_seen_on_cpu;
#endif
} top_status_t;
typedef struct jiffy_counts_t {
/* Linux 2.4.x has only first four */
unsigned long long usr, nic, sys, idle;
unsigned long long iowait, irq, softirq, steal;
unsigned long long total;
unsigned long long busy;
} jiffy_counts_t;
/* This structure stores some critical information from one frame to
the next. Used for finding deltas. */
typedef struct save_hist {
unsigned long ticks;
pid_t pid;
} save_hist;
typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
enum { SORT_DEPTH = 3 };
struct globals {
top_status_t *top;
int ntop;
#if ENABLE_FEATURE_TOPMEM
smallint sort_field;
smallint inverted;
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
smallint smp_cpu_info; /* one/many cpu info lines? */
#endif
#if ENABLE_FEATURE_USE_TERMIOS
struct termios initial_settings;
#endif
#if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
cmp_funcp sort_function[1];
#else
cmp_funcp sort_function[SORT_DEPTH];
struct save_hist *prev_hist;
int prev_hist_count;
jiffy_counts_t cur_jif, prev_jif;
/* int hist_iterations; */
unsigned total_pcpu;
/* unsigned long total_vsz; */
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
/* Per CPU samples: current and last */
jiffy_counts_t *cpu_jif, *cpu_prev_jif;
int num_cpus;
#endif
char line_buf[80];
};
enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { \
struct G_sizecheck { \
char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
}; \
} while (0)
#define top (G.top )
#define ntop (G.ntop )
#define sort_field (G.sort_field )
#define inverted (G.inverted )
#define smp_cpu_info (G.smp_cpu_info )
#define initial_settings (G.initial_settings )
#define sort_function (G.sort_function )
#define prev_hist (G.prev_hist )
#define prev_hist_count (G.prev_hist_count )
#define cur_jif (G.cur_jif )
#define prev_jif (G.prev_jif )
#define cpu_jif (G.cpu_jif )
#define cpu_prev_jif (G.cpu_prev_jif )
#define num_cpus (G.num_cpus )
#define total_pcpu (G.total_pcpu )
#define line_buf (G.line_buf )
enum {
OPT_d = (1 << 0),
OPT_n = (1 << 1),
OPT_b = (1 << 2),
OPT_EOF = (1 << 3), /* pseudo: "we saw EOF in stdin" */
};
#define OPT_BATCH_MODE (option_mask32 & OPT_b)
#if ENABLE_FEATURE_USE_TERMIOS
static int pid_sort(top_status_t *P, top_status_t *Q)
{
/* Buggy wrt pids with high bit set */
/* (linux pids are in [1..2^15-1]) */
return (Q->pid - P->pid);
}
#endif
static int mem_sort(top_status_t *P, top_status_t *Q)
{
/* We want to avoid unsigned->signed and truncation errors */
if (Q->vsz < P->vsz) return -1;
return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
}
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
static int pcpu_sort(top_status_t *P, top_status_t *Q)
{
/* Buggy wrt ticks with high bit set */
/* Affects only processes for which ticks overflow */
return (int)Q->pcpu - (int)P->pcpu;
}
static int time_sort(top_status_t *P, top_status_t *Q)
{
/* We want to avoid unsigned->signed and truncation errors */
if (Q->ticks < P->ticks) return -1;
return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
}
static int mult_lvl_cmp(void* a, void* b)
{
int i, cmp_val;
for (i = 0; i < SORT_DEPTH; i++) {
cmp_val = (*sort_function[i])(a, b);
if (cmp_val != 0)
return cmp_val;
}
return 0;
}
static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
{
#if !ENABLE_FEATURE_TOP_SMP_CPU
static const char fmt[] = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
#else
static const char fmt[] = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
#endif
int ret;
if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
return 0;
ret = sscanf(line_buf, fmt,
&p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
&p_jif->iowait, &p_jif->irq, &p_jif->softirq,
&p_jif->steal);
if (ret >= 4) {
p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
+ p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
/* procps 2.x does not count iowait as busy time */
p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
}
return ret;
}
static void get_jiffy_counts(void)
{
FILE* fp = xfopen_for_read("stat");
/* We need to parse cumulative counts even if SMP CPU display is on,
* they are used to calculate per process CPU% */
prev_jif = cur_jif;
if (read_cpu_jiffy(fp, &cur_jif) < 4)
bb_error_msg_and_die("can't read /proc/stat");
#if !ENABLE_FEATURE_TOP_SMP_CPU
fclose(fp);
return;
#else
if (!smp_cpu_info) {
fclose(fp);
return;
}
if (!num_cpus) {
/* First time here. How many CPUs?
* There will be at least 1 /proc/stat line with cpu%d
*/
while (1) {
cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
break;
num_cpus++;
}
if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
smp_cpu_info = 0;
cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
/* Otherwise the first per cpu display shows all 100% idles */
usleep(50000);
} else { /* Non first time invocation */
jiffy_counts_t *tmp;
int i;
/* First switch the sample pointers: no need to copy */
tmp = cpu_prev_jif;
cpu_prev_jif = cpu_jif;
cpu_jif = tmp;
/* Get the new samples */
for (i = 0; i < num_cpus; i++)
read_cpu_jiffy(fp, &cpu_jif[i]);
}
#endif
fclose(fp);
}
static void do_stats(void)
{
top_status_t *cur;
pid_t pid;
int i, last_i, n;
struct save_hist *new_hist;
get_jiffy_counts();
total_pcpu = 0;
/* total_vsz = 0; */
new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
/*
* Make a pass through the data to get stats.
*/
/* hist_iterations = 0; */
i = 0;
for (n = 0; n < ntop; n++) {
cur = top + n;
/*
* Calculate time in cur process. Time is sum of user time
* and system time
*/
pid = cur->pid;
new_hist[n].ticks = cur->ticks;
new_hist[n].pid = pid;
/* find matching entry from previous pass */
cur->pcpu = 0;
/* do not start at index 0, continue at last used one
* (brought hist_iterations from ~14000 down to 172) */
last_i = i;
if (prev_hist_count) do {
if (prev_hist[i].pid == pid) {
cur->pcpu = cur->ticks - prev_hist[i].ticks;
total_pcpu += cur->pcpu;
break;
}
i = (i+1) % prev_hist_count;
/* hist_iterations++; */
} while (i != last_i);
/* total_vsz += cur->vsz; */
}
/*
* Save cur frame's information.
*/
free(prev_hist);
prev_hist = new_hist;
prev_hist_count = ntop;
}
#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
/* formats 7 char string (8 with terminating NUL) */
static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
{
unsigned t;
if (value >= total) { /* 100% ? */
strcpy(pbuf, " 100% ");
return pbuf;
}
/* else generate " [N/space]N.N% " string */
value = 1000 * value / total;
t = value / 100;
value = value % 100;
pbuf[0] = ' ';
pbuf[1] = t ? t + '0' : ' ';
pbuf[2] = '0' + (value / 10);
pbuf[3] = '.';
pbuf[4] = '0' + (value % 10);
pbuf[5] = '%';
pbuf[6] = ' ';
pbuf[7] = '\0';
return pbuf;
}
#endif
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
{
/*
* xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
*/
unsigned total_diff;
jiffy_counts_t *p_jif, *p_prev_jif;
int i;
#if ENABLE_FEATURE_TOP_SMP_CPU
int n_cpu_lines;
#endif
/* using (unsigned) casts to make operations cheaper */
#define CALC_TOT_DIFF ((unsigned)(p_jif->total - p_prev_jif->total) ? : 1)
#if ENABLE_FEATURE_TOP_DECIMALS
#define CALC_STAT(xxx) char xxx[8]
#define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
#define FMT "%s"
#else
#define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
#define SHOW_STAT(xxx) xxx
#define FMT "%4u%% "
#endif
#if !ENABLE_FEATURE_TOP_SMP_CPU
{
i = 1;
p_jif = &cur_jif;
p_prev_jif = &prev_jif;
#else
/* Loop thru CPU(s) */
n_cpu_lines = smp_cpu_info ? num_cpus : 1;
if (n_cpu_lines > *lines_rem_p)
n_cpu_lines = *lines_rem_p;
for (i = 0; i < n_cpu_lines; i++) {
p_jif = &cpu_jif[i];
p_prev_jif = &cpu_prev_jif[i];
#endif
total_diff = CALC_TOT_DIFF;
{ /* Need a block: CALC_STAT are declarations */
CALC_STAT(usr);
CALC_STAT(sys);
CALC_STAT(nic);
CALC_STAT(idle);
CALC_STAT(iowait);
CALC_STAT(irq);
CALC_STAT(softirq);
/*CALC_STAT(steal);*/
snprintf(scrbuf, scr_width,
/* Barely fits in 79 chars when in "decimals" mode. */
#if ENABLE_FEATURE_TOP_SMP_CPU
"CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
(smp_cpu_info ? utoa(i) : ""),
#else
"CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
#endif
SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
/*, SHOW_STAT(steal) - what is this 'steal' thing? */
/* I doubt anyone wants to know it */
);
puts(scrbuf);
}
}
#undef SHOW_STAT
#undef CALC_STAT
#undef FMT
*lines_rem_p -= i;
}
#else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
#define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
#endif
static unsigned long display_header(int scr_width, int *lines_rem_p)
{
FILE *fp;
char buf[80];
char scrbuf[80];
unsigned long total, used, mfree, shared, buffers, cached;
/* read memory info */
fp = xfopen_for_read("meminfo");
/*
* Old kernels (such as 2.4.x) had a nice summary of memory info that
* we could parse, however this is gone entirely in 2.6. Try parsing
* the old way first, and if that fails, parse each field manually.
*
* First, we read in the first line. Old kernels will have bogus
* strings we don't care about, whereas new kernels will start right
* out with MemTotal:
* -- PFM.
*/
if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
fgets(buf, sizeof(buf), fp); /* skip first line */
fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
&total, &used, &mfree, &shared, &buffers, &cached);
/* convert to kilobytes */
used /= 1024;
mfree /= 1024;
shared /= 1024;
buffers /= 1024;
cached /= 1024;
total /= 1024;
} else {
/*
* Revert to manual parsing, which incidentally already has the
* sizes in kilobytes. This should be safe for both 2.4 and
* 2.6.
*/
fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
/*
* MemShared: is no longer present in 2.6. Report this as 0,
* to maintain consistent behavior with normal procps.
*/
if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
shared = 0;
fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
fscanf(fp, "Cached: %lu %s\n", &cached, buf);
used = total - mfree;
}
fclose(fp);
/* output memory info */
if (scr_width > (int)sizeof(scrbuf))
scr_width = sizeof(scrbuf);
snprintf(scrbuf, scr_width,
"Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
used, mfree, shared, buffers, cached);
/* clear screen & go to top */
printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
(*lines_rem_p)--;
/* Display CPU time split as percentage of total time
* This displays either a cumulative line or one line per CPU
*/
display_cpus(scr_width, scrbuf, lines_rem_p);
/* read load average as a string */
buf[0] = '\0';
open_read_close("loadavg", buf, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = '\n';
*strchr(buf, '\n') = '\0';
snprintf(scrbuf, scr_width, "Load average: %s", buf);
puts(scrbuf);
(*lines_rem_p)--;
return total;
}
static NOINLINE void display_process_list(int lines_rem, int scr_width)
{
enum {
BITS_PER_INT = sizeof(int) * 8
};
top_status_t *s;
char vsz_str_buf[8];
unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
/* xxx_shift and xxx_scale variables allow us to replace
* expensive divides with multiply and shift */
unsigned pmem_shift, pmem_scale, pmem_half;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
unsigned pcpu_shift, pcpu_scale, pcpu_half;
unsigned busy_jifs;
#endif
/* what info of the processes is shown */
printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
" PID PPID USER STAT VSZ %MEM"
#if ENABLE_FEATURE_TOP_SMP_PROCESS
" CPU"
#endif
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
" %CPU"
#endif
" COMMAND");
lines_rem--;
#if ENABLE_FEATURE_TOP_DECIMALS
#define UPSCALE 1000
#define CALC_STAT(name, val) div_t name = div((val), 10)
#define SHOW_STAT(name) name.quot, '0'+name.rem
#define FMT "%3u.%c"
#else
#define UPSCALE 100
#define CALC_STAT(name, val) unsigned name = (val)
#define SHOW_STAT(name) name
#define FMT "%4u%%"
#endif
/*
* MEM% = s->vsz/MemTotal
*/
pmem_shift = BITS_PER_INT-11;
pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
/* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
while (pmem_scale >= 512) {
pmem_scale /= 4;
pmem_shift -= 2;
}
pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
busy_jifs = cur_jif.busy - prev_jif.busy;
/* This happens if there were lots of short-lived processes
* between two top updates (e.g. compilation) */
if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
/*
* CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
* (pcpu is delta of sys+user time between samples)
*/
/* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
* in 0..~64000 range (HZ*update_interval).
* we assume that unsigned is at least 32-bit.
*/
pcpu_shift = 6;
pcpu_scale = (UPSCALE*64 * (uint16_t)busy_jifs ? : 1);
while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
pcpu_scale *= 4;
pcpu_shift += 2;
}
pcpu_scale /= ( (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu ? : 1);
/* we want (s->pcpu * pcpu_scale) to never overflow */
while (pcpu_scale >= 1024) {
pcpu_scale /= 4;
pcpu_shift -= 2;
}
pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
/* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
#endif
/* Ok, all preliminary data is ready, go through the list */
scr_width += 2; /* account for leading '\n' and trailing NUL */
if (lines_rem > ntop)
lines_rem = ntop;
s = top;
while (--lines_rem >= 0) {
unsigned col;
CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
#endif
if (s->vsz >= 100000)
sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
else
sprintf(vsz_str_buf, "%7ld", s->vsz);
/* PID PPID USER STAT VSZ %MEM [%CPU] COMMAND */
col = snprintf(line_buf, scr_width,
"\n" "%5u%6u %-8.8s %s%s" FMT
#if ENABLE_FEATURE_TOP_SMP_PROCESS
" %3d"
#endif
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
FMT
#endif
" ",
s->pid, s->ppid, get_cached_username(s->uid),
s->state, vsz_str_buf,
SHOW_STAT(pmem)
#if ENABLE_FEATURE_TOP_SMP_PROCESS
, s->last_seen_on_cpu
#endif
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
, SHOW_STAT(pcpu)
#endif
);
if ((int)(col + 1) < scr_width)
read_cmdline(line_buf + col, scr_width - col - 1, s->pid, s->comm);
fputs(line_buf, stdout);
/* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
s++;
}
/* printf(" %d", hist_iterations); */
bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
fflush(stdout);
}
#undef UPSCALE
#undef SHOW_STAT
#undef CALC_STAT
#undef FMT
static void clearmems(void)
{
clear_username_cache();
free(top);
top = NULL;
ntop = 0;
}
#if ENABLE_FEATURE_USE_TERMIOS
static void reset_term(void)
{
tcsetattr_stdin_TCSANOW(&initial_settings);
if (ENABLE_FEATURE_CLEAN_UP) {
clearmems();
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
free(prev_hist);
#endif
}
}
static void sig_catcher(int sig UNUSED_PARAM)
{
reset_term();
exit(EXIT_FAILURE);
}
#endif /* FEATURE_USE_TERMIOS */
/*
* TOPMEM support
*/
typedef unsigned long mem_t;
typedef struct topmem_status_t {
unsigned pid;
char comm[COMM_LEN];
/* vsz doesn't count /dev/xxx mappings except /dev/zero */
mem_t vsz ;
mem_t vszrw ;
mem_t rss ;
mem_t rss_sh ;
mem_t dirty ;
mem_t dirty_sh;
mem_t stack ;
} topmem_status_t;
enum { NUM_SORT_FIELD = 7 };
#define topmem ((topmem_status_t*)top)
#if ENABLE_FEATURE_TOPMEM
static int topmem_sort(char *a, char *b)
{
int n;
mem_t l, r;
n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
l = *(mem_t*)(a + n);
r = *(mem_t*)(b + n);
// if (l == r) {
// l = a->mapped_rw;
// r = b->mapped_rw;
// }
/* We want to avoid unsigned->signed and truncation errors */
/* l>r: -1, l=r: 0, l<r: 1 */
n = (l > r) ? -1 : (l != r);
return inverted ? -n : n;
}
/* Cut "NNNN " out of " NNNN kb" */
static char *grab_number(char *str, const char *match, unsigned sz)
{
if (strncmp(str, match, sz) == 0) {
str = skip_whitespace(str + sz);
(skip_non_whitespace(str))[1] = '\0';
return xstrdup(str);
}
return NULL;
}
/* display header info (meminfo / loadavg) */
static void display_topmem_header(int scr_width, int *lines_rem_p)
{
char linebuf[128];
unsigned i;
FILE *fp;
union {
struct {
/* 1 */ char *total;
/* 2 */ char *mfree;
/* 3 */ char *buf;
/* 4 */ char *cache;
/* 5 */ char *swaptotal;
/* 6 */ char *swapfree;
/* 7 */ char *dirty;
/* 8 */ char *mwrite;
/* 9 */ char *anon;
/* 10 */ char *map;
/* 11 */ char *slab;
} u;
char *str[11];
} Z;
#define total Z.u.total
#define mfree Z.u.mfree
#define buf Z.u.buf
#define cache Z.u.cache
#define swaptotal Z.u.swaptotal
#define swapfree Z.u.swapfree
#define dirty Z.u.dirty
#define mwrite Z.u.mwrite
#define anon Z.u.anon
#define map Z.u.map
#define slab Z.u.slab
#define str Z.str
memset(&Z, 0, sizeof(Z));
/* read memory info */
fp = xfopen_for_read("meminfo");
while (fgets(linebuf, sizeof(linebuf), fp)) {
char *p;
#define SCAN(match, name) \
p = grab_number(linebuf, match, sizeof(match)-1); \
if (p) { name = p; continue; }
SCAN("MemTotal:", total);
SCAN("MemFree:", mfree);
SCAN("Buffers:", buf);
SCAN("Cached:", cache);
SCAN("SwapTotal:", swaptotal);
SCAN("SwapFree:", swapfree);
SCAN("Dirty:", dirty);
SCAN("Writeback:", mwrite);
SCAN("AnonPages:", anon);
SCAN("Mapped:", map);
SCAN("Slab:", slab);
#undef SCAN
}
fclose(fp);
#define S(s) (s ? s : "0 ")
snprintf(linebuf, sizeof(linebuf),
"Mem %stotal %sanon %smap %sfree",
S(total), S(anon), S(map), S(mfree));
printf(OPT_BATCH_MODE ? "%.*s\n" : "\e[H\e[J%.*s\n", scr_width, linebuf);
snprintf(linebuf, sizeof(linebuf),
" %sslab %sbuf %scache %sdirty %swrite",
S(slab), S(buf), S(cache), S(dirty), S(mwrite));
printf("%.*s\n", scr_width, linebuf);
snprintf(linebuf, sizeof(linebuf),
"Swap %stotal %sfree", // TODO: % used?
S(swaptotal), S(swapfree));
printf("%.*s\n", scr_width, linebuf);
(*lines_rem_p) -= 3;
#undef S
for (i = 0; i < ARRAY_SIZE(str); i++)
free(str[i]);
#undef total
#undef free
#undef buf
#undef cache
#undef swaptotal
#undef swapfree
#undef dirty
#undef write
#undef anon
#undef map
#undef slab
#undef str
}
static void ulltoa6_and_space(unsigned long long ul, char buf[6])
{
/* see http://en.wikipedia.org/wiki/Tera */
smart_ulltoa5(ul, buf, " mgtpezy");
buf[5] = ' ';
}
static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
{
#define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
#define MIN_WIDTH sizeof(HDR_STR)
const topmem_status_t *s = topmem;
display_topmem_header(scr_width, &lines_rem);
strcpy(line_buf, HDR_STR " COMMAND");
line_buf[5 + sort_field * 6] = '*';
printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
lines_rem--;
if (lines_rem > ntop)
lines_rem = ntop;
while (--lines_rem >= 0) {
/* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
ulltoa6_and_space(s->pid , &line_buf[0*6]);
ulltoa6_and_space(s->vsz , &line_buf[1*6]);
ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
ulltoa6_and_space(s->rss , &line_buf[3*6]);
ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
ulltoa6_and_space(s->dirty , &line_buf[5*6]);
ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
ulltoa6_and_space(s->stack , &line_buf[7*6]);
line_buf[8*6] = '\0';
if (scr_width > (int)MIN_WIDTH) {
read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
}
printf("\n""%.*s", scr_width, line_buf);
s++;
}
bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
fflush(stdout);
#undef HDR_STR
#undef MIN_WIDTH
}
#else
void display_topmem_process_list(int lines_rem, int scr_width);
int topmem_sort(char *a, char *b);
#endif /* TOPMEM */
/*
* end TOPMEM support
*/
enum {
TOP_MASK = 0
| PSSCAN_PID
| PSSCAN_PPID
| PSSCAN_VSZ
| PSSCAN_STIME
| PSSCAN_UTIME
| PSSCAN_STATE
| PSSCAN_COMM
#if ENABLE_FEATURE_TOP_SMP_PROCESS
| PSSCAN_CPU
#endif
| PSSCAN_UIDGID,
TOPMEM_MASK = 0
| PSSCAN_PID
| PSSCAN_SMAPS
| PSSCAN_COMM,
};
int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int top_main(int argc UNUSED_PARAM, char **argv)
{
int iterations;
unsigned lines, col;
int lines_rem;
unsigned interval;
char *str_interval, *str_iterations;
SKIP_FEATURE_TOPMEM(const) unsigned scan_mask = TOP_MASK;
#if ENABLE_FEATURE_USE_TERMIOS
struct termios new_settings;
struct pollfd pfd[1];
unsigned char c;
pfd[0].fd = 0;
pfd[0].events = POLLIN;
#endif /* FEATURE_USE_TERMIOS */
INIT_G();
interval = 5; /* default update interval is 5 seconds */
iterations = 0; /* infinite */
#if ENABLE_FEATURE_TOP_SMP_CPU
/*num_cpus = 0;*/
/*smp_cpu_info = 0;*/ /* to start with show aggregate */
cpu_jif = &cur_jif;
cpu_prev_jif = &prev_jif;
#endif
/* all args are options; -n NUM */
opt_complementary = "-";
col = getopt32(argv, "d:n:b", &str_interval, &str_iterations);
if (col & OPT_d) {
/* work around for "-d 1" -> "-d -1" done by getopt32 */
if (str_interval[0] == '-')
str_interval++;
/* Need to limit it to not overflow poll timeout */
interval = xatou16(str_interval);
}
if (col & OPT_n) {
if (str_iterations[0] == '-')
str_iterations++;
iterations = xatou(str_iterations);
}
/* change to /proc */
xchdir("/proc");
#if ENABLE_FEATURE_USE_TERMIOS
tcgetattr(0, (void *) &initial_settings);
memcpy(&new_settings, &initial_settings, sizeof(new_settings));
/* unbuffered input, turn off echo */
new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
bb_signals(BB_FATAL_SIGS, sig_catcher);
tcsetattr_stdin_TCSANOW(&new_settings);
#endif /* FEATURE_USE_TERMIOS */
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
sort_function[0] = pcpu_sort;
sort_function[1] = mem_sort;
sort_function[2] = time_sort;
#else
sort_function[0] = mem_sort;
#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
while (1) {
procps_status_t *p = NULL;
lines = 24; /* default */
col = 79;
#if ENABLE_FEATURE_USE_TERMIOS
/* We output to stdout, we need size of stdout (not stdin)! */
get_terminal_width_height(STDOUT_FILENO, &col, &lines);
if (lines < 5 || col < 10) {
sleep(interval);
continue;
}
#endif /* FEATURE_USE_TERMIOS */
if (col > LINE_BUF_SIZE-2) /* +2 bytes for '\n', NUL, */
col = LINE_BUF_SIZE-2;
/* read process IDs & status for all the processes */
while ((p = procps_scan(p, scan_mask)) != NULL) {
int n;
if (scan_mask == TOP_MASK) {
n = ntop;
top = xrealloc_vector(top, 6, ntop++);
top[n].pid = p->pid;
top[n].ppid = p->ppid;
top[n].vsz = p->vsz;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
top[n].ticks = p->stime + p->utime;
#endif
top[n].uid = p->uid;
strcpy(top[n].state, p->state);
strcpy(top[n].comm, p->comm);
#if ENABLE_FEATURE_TOP_SMP_PROCESS
top[n].last_seen_on_cpu = p->last_seen_on_cpu;
#endif
} else { /* TOPMEM */
#if ENABLE_FEATURE_TOPMEM
if (!(p->mapped_ro | p->mapped_rw))
continue; /* kernel threads are ignored */
n = ntop;
/* No bug here - top and topmem are the same */
top = xrealloc_vector(topmem, 6, ntop++);
strcpy(topmem[n].comm, p->comm);
topmem[n].pid = p->pid;
topmem[n].vsz = p->mapped_rw + p->mapped_ro;
topmem[n].vszrw = p->mapped_rw;
topmem[n].rss_sh = p->shared_clean + p->shared_dirty;
topmem[n].rss = p->private_clean + p->private_dirty + topmem[n].rss_sh;
topmem[n].dirty = p->private_dirty + p->shared_dirty;
topmem[n].dirty_sh = p->shared_dirty;
topmem[n].stack = p->stack;
#endif
}
} /* end of "while we read /proc" */
if (ntop == 0) {
bb_error_msg("no process info in /proc");
break;
}
if (scan_mask == TOP_MASK) {
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
if (!prev_hist_count) {
do_stats();
usleep(100000);
clearmems();
continue;
}
do_stats();
/* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
#else
qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
}
#if ENABLE_FEATURE_TOPMEM
else { /* TOPMEM */
qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
}
#endif
lines_rem = lines;
if (OPT_BATCH_MODE) {
lines_rem = INT_MAX;
}
if (scan_mask == TOP_MASK)
display_process_list(lines_rem, col);
#if ENABLE_FEATURE_TOPMEM
else
display_topmem_process_list(lines_rem, col);
#endif
clearmems();
if (iterations >= 0 && !--iterations)
break;
#if !ENABLE_FEATURE_USE_TERMIOS
sleep(interval);
#else
if (option_mask32 & (OPT_b|OPT_EOF))
/* batch mode, or EOF on stdin ("top </dev/null") */
sleep(interval);
else if (safe_poll(pfd, 1, interval * 1000) > 0) {
if (safe_read(STDIN_FILENO, &c, 1) != 1) { /* error/EOF? */
option_mask32 |= OPT_EOF;
continue;
}
if (c == initial_settings.c_cc[VINTR])
break;
c |= 0x20; /* lowercase */
if (c == 'q')
break;
if (c == 'n') {
USE_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
sort_function[0] = pid_sort;
}
if (c == 'm') {
USE_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
sort_function[0] = mem_sort;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
sort_function[1] = pcpu_sort;
sort_function[2] = time_sort;
#endif
}
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
if (c == 'p') {
USE_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
sort_function[0] = pcpu_sort;
sort_function[1] = mem_sort;
sort_function[2] = time_sort;
}
if (c == 't') {
USE_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
sort_function[0] = time_sort;
sort_function[1] = mem_sort;
sort_function[2] = pcpu_sort;
}
#if ENABLE_FEATURE_TOPMEM
if (c == 's') {
scan_mask = TOPMEM_MASK;
free(prev_hist);
prev_hist = NULL;
prev_hist_count = 0;
sort_field = (sort_field + 1) % NUM_SORT_FIELD;
}
if (c == 'r')
inverted ^= 1;
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
/* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
if (c == 'c' || c == '1') {
/* User wants to toggle per cpu <> aggregate */
if (smp_cpu_info) {
free(cpu_prev_jif);
free(cpu_jif);
cpu_jif = &cur_jif;
cpu_prev_jif = &prev_jif;
} else {
/* Prepare for xrealloc() */
cpu_jif = cpu_prev_jif = NULL;
}
num_cpus = 0;
smp_cpu_info = !smp_cpu_info;
get_jiffy_counts();
}
#endif
#endif
}
#endif /* FEATURE_USE_TERMIOS */
} /* end of "while (1)" */
bb_putchar('\n');
#if ENABLE_FEATURE_USE_TERMIOS
reset_term();
#endif
return EXIT_SUCCESS;
}
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