570 lines
14 KiB
C
570 lines
14 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* A tiny 'top' utility.
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*
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* This is written specifically for the linux /proc/<PID>/stat(m)
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* files format.
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* This reads the PIDs of all processes and their status and shows
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* the status of processes (first ones that fit to screen) at given
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* intervals.
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*
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* NOTES:
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* - At startup this changes to /proc, all the reads are then
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* relative to that.
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*
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* (C) Eero Tamminen <oak at welho dot com>
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*
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* Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
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*/
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/* Original code Copyrights */
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/*
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* Copyright (c) 1992 Branko Lankester
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* Copyright (c) 1992 Roger Binns
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* Copyright (C) 1994-1996 Charles L. Blake.
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* Copyright (C) 1992-1998 Michael K. Johnson
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* May be distributed under the conditions of the
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* GNU Library General Public License
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*/
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#include "busybox.h"
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typedef struct {
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unsigned long rss;
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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unsigned long ticks;
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unsigned pcpu; /* delta of ticks */
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#endif
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unsigned pid, ppid;
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unsigned uid;
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char state[4];
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char comm[COMM_LEN];
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} top_status_t;
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static top_status_t *top;
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static int ntop;
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/* This structure stores some critical information from one frame to
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the next. Used for finding deltas. */
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struct save_hist {
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unsigned long ticks;
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unsigned pid;
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};
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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static struct save_hist *prev_hist;
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static int prev_hist_count;
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/* static int hist_iterations; */
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static unsigned total_pcpu;
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/* static unsigned long total_rss; */
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#endif
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#define OPT_BATCH_MODE (option_mask32 & 0x4)
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#if ENABLE_FEATURE_USE_TERMIOS
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static int pid_sort(top_status_t *P, top_status_t *Q)
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{
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/* Buggy wrt pids with high bit set */
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/* (linux pids are in [1..2^15-1]) */
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return (Q->pid - P->pid);
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}
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#endif
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static int mem_sort(top_status_t *P, top_status_t *Q)
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{
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/* We want to avoid unsigned->signed and truncation errors */
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if (Q->rss < P->rss) return -1;
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return Q->rss != P->rss; /* 0 if ==, 1 if > */
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}
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typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
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#if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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static cmp_funcp sort_function;
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#else
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enum { SORT_DEPTH = 3 };
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static cmp_funcp sort_function[SORT_DEPTH];
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static int pcpu_sort(top_status_t *P, top_status_t *Q)
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{
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/* Buggy wrt ticks with high bit set */
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/* Affects only processes for which ticks overflow */
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return (int)Q->pcpu - (int)P->pcpu;
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}
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static int time_sort(top_status_t *P, top_status_t *Q)
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{
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/* We want to avoid unsigned->signed and truncation errors */
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if (Q->ticks < P->ticks) return -1;
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return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
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}
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static int mult_lvl_cmp(void* a, void* b) {
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int i, cmp_val;
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for (i = 0; i < SORT_DEPTH; i++) {
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cmp_val = (*sort_function[i])(a, b);
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if (cmp_val != 0)
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return cmp_val;
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}
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return 0;
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}
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typedef struct {
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unsigned long long usr,nic,sys,idle,iowait,irq,softirq,steal;
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unsigned long long total;
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unsigned long long busy;
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} jiffy_counts_t;
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static jiffy_counts_t jif, prev_jif;
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static void get_jiffy_counts(void)
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{
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FILE* fp = xfopen("stat", "r");
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prev_jif = jif;
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if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
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&jif.usr,&jif.nic,&jif.sys,&jif.idle,
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&jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
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bb_error_msg_and_die("failed to read /proc/stat");
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}
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fclose(fp);
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jif.total = jif.usr + jif.nic + jif.sys + jif.idle
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+ jif.iowait + jif.irq + jif.softirq + jif.steal;
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/* procps 2.x does not count iowait as busy time */
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jif.busy = jif.total - jif.idle - jif.iowait;
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}
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static void do_stats(void)
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{
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top_status_t *cur;
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pid_t pid;
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int i, last_i, n;
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struct save_hist *new_hist;
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get_jiffy_counts();
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total_pcpu = 0;
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/* total_rss = 0; */
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new_hist = xmalloc(sizeof(struct save_hist)*ntop);
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/*
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* Make a pass through the data to get stats.
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*/
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/* hist_iterations = 0; */
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i = 0;
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for (n = 0; n < ntop; n++) {
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cur = top + n;
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/*
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* Calculate time in cur process. Time is sum of user time
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* and system time
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*/
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pid = cur->pid;
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new_hist[n].ticks = cur->ticks;
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new_hist[n].pid = pid;
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/* find matching entry from previous pass */
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cur->pcpu = 0;
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/* do not start at index 0, continue at last used one
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* (brought hist_iterations from ~14000 down to 172) */
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last_i = i;
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if (prev_hist_count) do {
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if (prev_hist[i].pid == pid) {
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cur->pcpu = cur->ticks - prev_hist[i].ticks;
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total_pcpu += cur->pcpu;
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break;
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}
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i = (i+1) % prev_hist_count;
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/* hist_iterations++; */
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} while (i != last_i);
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/* total_rss += cur->rss; */
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}
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/*
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* Save cur frame's information.
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*/
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free(prev_hist);
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prev_hist = new_hist;
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prev_hist_count = ntop;
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}
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#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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/* display generic info (meminfo / loadavg) */
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static unsigned long display_generic(int scr_width)
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{
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FILE *fp;
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char buf[80];
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char scrbuf[80];
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char *end;
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unsigned long total, used, mfree, shared, buffers, cached;
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unsigned int needs_conversion = 1;
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/* read memory info */
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fp = xfopen("meminfo", "r");
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/*
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* Old kernels (such as 2.4.x) had a nice summary of memory info that
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* we could parse, however this is gone entirely in 2.6. Try parsing
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* the old way first, and if that fails, parse each field manually.
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*
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* First, we read in the first line. Old kernels will have bogus
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* strings we don't care about, whereas new kernels will start right
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* out with MemTotal:
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* -- PFM.
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*/
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if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
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fgets(buf, sizeof(buf), fp); /* skip first line */
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fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
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&total, &used, &mfree, &shared, &buffers, &cached);
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} else {
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/*
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* Revert to manual parsing, which incidentally already has the
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* sizes in kilobytes. This should be safe for both 2.4 and
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* 2.6.
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*/
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needs_conversion = 0;
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fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
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/*
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* MemShared: is no longer present in 2.6. Report this as 0,
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* to maintain consistent behavior with normal procps.
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*/
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if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
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shared = 0;
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fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
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fscanf(fp, "Cached: %lu %s\n", &cached, buf);
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used = total - mfree;
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}
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fclose(fp);
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/* read load average as a string */
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buf[0] = '\0';
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open_read_close("loadavg", buf, sizeof(buf));
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end = strchr(buf, ' ');
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if (end) end = strchr(end+1, ' ');
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if (end) end = strchr(end+1, ' ');
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if (end) *end = '\0';
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if (needs_conversion) {
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/* convert to kilobytes */
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used /= 1024;
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mfree /= 1024;
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shared /= 1024;
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buffers /= 1024;
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cached /= 1024;
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total /= 1024;
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}
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/* output memory info and load average */
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/* clear screen & go to top */
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if (scr_width > sizeof(scrbuf))
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scr_width = sizeof(scrbuf);
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snprintf(scrbuf, scr_width,
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"Mem: %ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached",
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used, mfree, shared, buffers, cached);
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printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
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snprintf(scrbuf, scr_width, "Load average: %s", buf);
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printf("%s\n", scrbuf);
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return total;
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}
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/* display process statuses */
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static void display_status(int count, int scr_width)
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{
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enum {
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bits_per_int = sizeof(int)*8
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};
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top_status_t *s = top;
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char rss_str_buf[8];
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unsigned long total_memory = display_generic(scr_width); /* or use total_rss? */
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unsigned pmem_shift, pmem_scale;
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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unsigned pcpu_shift, pcpu_scale;
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unsigned busy_jifs;
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/* what info of the processes is shown */
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printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
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" PID USER STATUS RSS PPID %CPU %MEM COMMAND");
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#define MIN_WIDTH \
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sizeof( " PID USER STATUS RSS PPID %CPU %MEM C")
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#else
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printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
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" PID USER STATUS RSS PPID %MEM COMMAND");
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#define MIN_WIDTH \
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sizeof( " PID USER STATUS RSS PPID %MEM C")
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#endif
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/*
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* MEM% = s->rss/MemTotal
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*/
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pmem_shift = bits_per_int-11;
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pmem_scale = 1000*(1U<<(bits_per_int-11)) / total_memory;
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/* s->rss is in kb. we want (s->rss * pmem_scale) to never overflow */
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while (pmem_scale >= 512) {
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pmem_scale /= 4;
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pmem_shift -= 2;
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}
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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busy_jifs = jif.busy - prev_jif.busy;
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/* This happens if there were lots of short-lived processes
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* between two top updates (e.g. compilation) */
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if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
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/*
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* CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
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* (pcpu is delta of sys+user time between samples)
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*/
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/* (jif.xxx - prev_jif.xxx) and s->pcpu are
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* in 0..~64000 range (HZ*update_interval).
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* we assume that unsigned is at least 32-bit.
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*/
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pcpu_shift = 6;
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pcpu_scale = (1000*64*(uint16_t)busy_jifs ? : 1);
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while (pcpu_scale < (1U<<(bits_per_int-2))) {
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pcpu_scale *= 4;
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pcpu_shift += 2;
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}
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pcpu_scale /= ( (uint16_t)(jif.total-prev_jif.total)*total_pcpu ? : 1);
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/* we want (s->pcpu * pcpu_scale) to never overflow */
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while (pcpu_scale >= 1024) {
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pcpu_scale /= 4;
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pcpu_shift -= 2;
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}
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/* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
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#endif
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while (count-- > 0) {
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div_t pmem = div((s->rss*pmem_scale) >> pmem_shift, 10);
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int col = scr_width+1;
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
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if (s->rss >= 100*1024)
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sprintf(rss_str_buf, "%6ldM", s->rss/1024);
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else
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sprintf(rss_str_buf, "%7ld", s->rss);
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(
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pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);
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)
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col -= printf("\n%5u %-8s %s "
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"%s%6u"
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c")
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"%3u.%c ",
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s->pid, get_cached_username(s->uid), s->state,
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rss_str_buf, s->ppid,
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
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pmem.quot, '0'+pmem.rem);
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if (col > 0)
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printf("%.*s", col, s->comm);
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/* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
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jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
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s++;
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}
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/* printf(" %d", hist_iterations); */
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putchar(OPT_BATCH_MODE ? '\n' : '\r');
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fflush(stdout);
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}
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static void clearmems(void)
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{
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clear_username_cache();
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free(top);
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top = 0;
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ntop = 0;
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}
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#if ENABLE_FEATURE_USE_TERMIOS
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#include <termios.h>
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#include <signal.h>
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static struct termios initial_settings;
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static void reset_term(void)
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{
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tcsetattr(0, TCSANOW, (void *) &initial_settings);
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#if ENABLE_FEATURE_CLEAN_UP
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clearmems();
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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free(prev_hist);
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#endif
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#endif /* FEATURE_CLEAN_UP */
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}
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static void sig_catcher(int sig ATTRIBUTE_UNUSED)
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{
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reset_term();
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exit(1);
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}
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#endif /* FEATURE_USE_TERMIOS */
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int top_main(int argc, char **argv)
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{
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int count, lines, col;
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unsigned interval = 5; /* default update rate is 5 seconds */
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unsigned iterations = UINT_MAX; /* 2^32 iterations by default :) */
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char *sinterval, *siterations;
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#if ENABLE_FEATURE_USE_TERMIOS
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struct termios new_settings;
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struct timeval tv;
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fd_set readfds;
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unsigned char c;
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#endif /* FEATURE_USE_TERMIOS */
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/* do normal option parsing */
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interval = 5;
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opt_complementary = "-";
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getopt32(argc, argv, "d:n:b", &sinterval, &siterations);
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if (option_mask32 & 0x1) interval = xatou(sinterval); // -d
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if (option_mask32 & 0x2) iterations = xatou(siterations); // -n
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//if (option_mask32 & 0x4) // -b
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/* change to /proc */
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xchdir("/proc");
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#if ENABLE_FEATURE_USE_TERMIOS
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tcgetattr(0, (void *) &initial_settings);
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memcpy(&new_settings, &initial_settings, sizeof(struct termios));
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/* unbuffered input, turn off echo */
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new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
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signal(SIGTERM, sig_catcher);
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signal(SIGINT, sig_catcher);
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tcsetattr(0, TCSANOW, (void *) &new_settings);
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atexit(reset_term);
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#endif /* FEATURE_USE_TERMIOS */
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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sort_function[0] = pcpu_sort;
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sort_function[1] = mem_sort;
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sort_function[2] = time_sort;
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#else
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sort_function = mem_sort;
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#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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while (1) {
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procps_status_t *p = NULL;
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/* Default to 25 lines - 5 lines for status */
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lines = 24 - 3;
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col = 79;
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#if ENABLE_FEATURE_USE_TERMIOS
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get_terminal_width_height(0, &col, &lines);
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if (lines < 5 || col < MIN_WIDTH) {
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sleep(interval);
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continue;
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}
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lines -= 3;
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#endif /* FEATURE_USE_TERMIOS */
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/* read process IDs & status for all the processes */
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while ((p = procps_scan(p, 0
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| PSSCAN_PID
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| PSSCAN_PPID
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| PSSCAN_RSS
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| PSSCAN_STIME
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| PSSCAN_UTIME
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| PSSCAN_STATE
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| PSSCAN_COMM
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| PSSCAN_SID
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| PSSCAN_UIDGID
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))) {
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int n = ntop;
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top = xrealloc(top, (++ntop)*sizeof(top_status_t));
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top[n].pid = p->pid;
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top[n].ppid = p->ppid;
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top[n].rss = p->rss;
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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top[n].ticks = p->stime + p->utime;
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#endif
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top[n].uid = p->uid;
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strcpy(top[n].state, p->state);
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strcpy(top[n].comm, p->comm);
|
|
}
|
|
if (ntop == 0) {
|
|
bb_error_msg_and_die("can't find process info in /proc");
|
|
}
|
|
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
if (!prev_hist_count) {
|
|
do_stats();
|
|
sleep(1);
|
|
clearmems();
|
|
continue;
|
|
}
|
|
do_stats();
|
|
qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
|
|
#else
|
|
qsort(top, ntop, sizeof(top_status_t), (void*)sort_function);
|
|
#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
|
|
count = lines;
|
|
if (OPT_BATCH_MODE || count > ntop) {
|
|
count = ntop;
|
|
}
|
|
/* show status for each of the processes */
|
|
display_status(count, col);
|
|
#if ENABLE_FEATURE_USE_TERMIOS
|
|
tv.tv_sec = interval;
|
|
tv.tv_usec = 0;
|
|
FD_ZERO(&readfds);
|
|
FD_SET(0, &readfds);
|
|
select(1, &readfds, NULL, NULL, &tv);
|
|
if (FD_ISSET(0, &readfds)) {
|
|
if (read(0, &c, 1) <= 0) { /* signal */
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (c == 'q' || c == initial_settings.c_cc[VINTR])
|
|
break;
|
|
if (c == 'M') {
|
|
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
sort_function[0] = mem_sort;
|
|
sort_function[1] = pcpu_sort;
|
|
sort_function[2] = time_sort;
|
|
#else
|
|
sort_function = mem_sort;
|
|
#endif
|
|
}
|
|
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
if (c == 'P') {
|
|
sort_function[0] = pcpu_sort;
|
|
sort_function[1] = mem_sort;
|
|
sort_function[2] = time_sort;
|
|
}
|
|
if (c == 'T') {
|
|
sort_function[0] = time_sort;
|
|
sort_function[1] = mem_sort;
|
|
sort_function[2] = pcpu_sort;
|
|
}
|
|
#endif
|
|
if (c == 'N') {
|
|
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
sort_function[0] = pid_sort;
|
|
#else
|
|
sort_function = pid_sort;
|
|
#endif
|
|
}
|
|
}
|
|
if (!--iterations)
|
|
break;
|
|
#else
|
|
sleep(interval);
|
|
#endif /* FEATURE_USE_TERMIOS */
|
|
clearmems();
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
clearmems();
|
|
putchar('\n');
|
|
return EXIT_SUCCESS;
|
|
}
|