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procps/vmstat.c
albert ade43a692b c99 -- ugh, this is HARD
2002-11-27 08:21:30 +00:00

397 lines
10 KiB
C
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/* Copyright 1994 by Henry Ware <al172@yfn.ysu.edu>. Copyleft same year. */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/dir.h>
#include <dirent.h>
#include "proc/sysinfo.h"
#include "proc/version.h"
#define BUFFSIZE 8192
#define FALSE 0
#define TRUE 1
static char buff[BUFFSIZE]; /* used in the procedures */
typedef unsigned long long jiff;
static int a_option; /* "-a" means "show active/inactive" */
static unsigned sleep_time = 1;
static unsigned long num_updates;
static unsigned int height; // window height
static unsigned int moreheaders=TRUE;
/////////////////////////////////////////////////////////////////////////
static void usage(void) {
fprintf(stderr,"usage: vmstat [-V] [-n] [delay [count]]\n");
fprintf(stderr," -V prints version.\n");
fprintf(stderr," -n causes the headers not to be reprinted regularly.\n");
fprintf(stderr," -a print inactive/active page stats.\n");
fprintf(stderr," delay is the delay between updates in seconds. \n");
fprintf(stderr," count is the number of updates.\n");
exit(EXIT_FAILURE);
}
static void crash(const char *filename) {
perror(filename);
exit(EXIT_FAILURE);
}
////////////////////////////////////////////////////////////////////////
static void getrunners(unsigned int *restrict running, unsigned int *restrict blocked) {
static struct direct *ent;
DIR *proc;
*running=0;
*blocked=0;
if((proc=opendir("/proc"))==NULL) crash("/proc");
while(( ent=readdir(proc) )) {
unsigned size;
int fd;
char filename[80];
char c;
if (!isdigit(ent->d_name[0])) continue;
sprintf(filename, "/proc/%s/stat", ent->d_name);
fd = open(filename, O_RDONLY, 0);
if (fd == -1) continue;
read(fd,buff,BUFFSIZE-1);
sscanf(
buff,
"%*d %*s %c "
"%*d %*d %*d %*d %*d %*u %*u"
" %*u %*u %*u %*d %*d %*d %*d %*d %*d %*u %*u %*d %*u %u"
/* " %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u\n" */ ,
&c,
&size
);
close(fd);
if (c=='R') {
(*running)++;
continue;
}
if (c=='D') {
(*blocked)++;
continue;
}
}
closedir(proc);
}
static void getstat(jiff *restrict cuse, jiff *restrict cice, jiff *restrict csys, jiff *restrict cide, jiff *restrict ciow,
unsigned *restrict pin, unsigned *restrict pout, unsigned *restrict s_in, unsigned *restrict sout,
unsigned *restrict itot, unsigned *restrict i1, unsigned *restrict ct,
unsigned int *restrict running, unsigned int *restrict blocked) {
static int fd;
int need_vmstat_file = 0;
int need_proc_scan = 0;
const char* b;
buff[BUFFSIZE-1] = 0; /* ensure null termination in buffer */
if(fd){
lseek(fd, 0L, SEEK_SET);
}else{
fd = open("/proc/stat", O_RDONLY, 0);
if(fd == -1) crash("/proc/stat");
}
read(fd,buff,BUFFSIZE-1);
*itot = 0;
*i1 = 1; /* ensure assert below will fail if the sscanf bombs */
*ciow = 0; /* not separated out until the 2.5.41 kernel */
b = strstr(buff, "cpu ");
if(b) sscanf(b, "cpu %Lu %Lu %Lu %Lu %Lu", cuse, cice, csys, cide, ciow);
b = strstr(buff, "page ");
if(b) sscanf(b, "page %u %u", pin, pout);
else need_vmstat_file = 1;
b = strstr(buff, "swap ");
if(b) sscanf(b, "swap %u %u", s_in, sout);
else need_vmstat_file = 1;
b = strstr(buff, "intr ");
if(b) sscanf(b, "intr %u %u", itot, i1);
b = strstr(buff, "ctxt ");
if(b) sscanf(b, "ctxt %u", ct);
b = strstr(buff, "procs_running ");
if(b) sscanf(b, "procs_running %u", running);
else need_proc_scan = 1;
b = strstr(buff, "procs_blocked ");
if(b) sscanf(b, "procs_blocked %u", blocked);
else need_proc_scan = 1;
if(need_proc_scan){ /* Linux 2.5.46 (approximately) and below */
getrunners(running, blocked);
}
(*running)--; // exclude vmstat itself
if(need_vmstat_file){ /* Linux 2.5.40-bk4 and above */
vminfo();
*pin = vm_pgpgin;
*pout = vm_pgpgout;
*s_in = vm_pswpin;
*sout = vm_pswpout;
}
}
//////////////////////////////////////////////////////////////////////////////////////
#if 0
// produce: " 6 ", "123 ", "123k ", etc.
static int format_1024(unsigned long long val64, char *restrict dst){
unsigned oldval;
const char suffix[] = " kmgtpe";
unsigned level = 0;
unsigned val32;
if(val64 < 1000){ // special case to avoid "6.0 " when plain " 6 " would do
val32 = val64;
return sprintf(dst,"%3u ",val32);
}
while(val64 > 0xffffffffull){
level++;
val64 /= 1024;
}
val32 = val64;
while(val32 > 999){
level++;
oldval = val32;
val32 /= 1024;
}
if(val32 < 10){
unsigned fract = (oldval % 1024) * 10 / 1024;
return sprintf(dst, "%u.%u%c ", val32, fract, suffix[level]);
}
return sprintf(dst, "%3u%c ", val32, suffix[level]);
}
// produce: " 6 ", "123 ", "123k ", etc.
static int format_1000(unsigned long long val64, char *restrict dst){
unsigned oldval;
const char suffix[] = " kmgtpe";
unsigned level = 0;
unsigned val32;
if(val64 < 1000){ // special case to avoid "6.0 " when plain " 6 " would do
val32 = val64;
return sprintf(dst,"%3u ",val32);
}
while(val64 > 0xffffffffull){
level++;
val64 /= 1000;
}
val32 = val64;
while(val32 > 999){
level++;
oldval = val32;
val32 /= 1000;
}
if(val32 < 10){
unsigned fract = (oldval % 1000) / 100;
return sprintf(dst, "%u.%u%c ", val32, fract, suffix[level]);
}
return sprintf(dst, "%3u%c ", val32, suffix[level]);
}
#endif
static void new_header(void){
printf("procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----\n");
printf(
"%2s %2s %6s %6s %6s %6s %4s %4s %5s %5s %4s %5s %2s %2s %2s %2s\n",
"r","b",
"swpd", "free", a_option?"inact":"buff", a_option?"active":"cache",
"si","so",
"bi","bo",
"in","cs",
"us","sy","id","wa"
);
}
static void new_format(void) {
const char format[]="%2u %2u %6u %6u %6u %6u %4u %4u %5u %5u %4u %5u %2u %2u %2u %2u\n";
unsigned int tog=0; /* toggle switch for cleaner code */
unsigned int i;
unsigned int hz = Hertz;
unsigned int running,blocked;
jiff cpu_use[2], cpu_nic[2], cpu_sys[2], cpu_idl[2], cpu_iow[2];
jiff duse,dsys,didl,diow,Div,divo2;
unsigned int pgpgin[2], pgpgout[2], pswpin[2], pswpout[2];
unsigned int inter[2],ticks[2],ctxt[2];
unsigned int sleep_half;
unsigned int kb_per_page = sysconf(_SC_PAGESIZE) / 1024;
int debt = 0; // handle idle ticks running backwards
sleep_half=(sleep_time/2);
new_header();
meminfo();
getstat(cpu_use,cpu_nic,cpu_sys,cpu_idl,cpu_iow,
pgpgin,pgpgout,pswpin,pswpout,
inter,ticks,ctxt,
&running,&blocked);
duse= *cpu_use + *cpu_nic;
dsys= *cpu_sys;
didl= *cpu_idl;
diow= *cpu_iow;
Div= duse+dsys+didl+diow;
divo2= Div/2UL;
printf(format,
running, blocked,
kb_swap_used, kb_main_free,
a_option?kb_inactive:kb_main_buffers,
a_option?kb_active:kb_main_cached,
(unsigned)( (*pswpin * kb_per_page * hz + divo2) / Div ),
(unsigned)( (*pswpout * kb_per_page * hz + divo2) / Div ),
(unsigned)( (*pgpgin * hz + divo2) / Div ),
(unsigned)( (*pgpgout * hz + divo2) / Div ),
(unsigned)( (*inter * hz + divo2) / Div ),
(unsigned)( (*ctxt * hz + divo2) / Div ),
(unsigned)( (100*duse + divo2) / Div ),
(unsigned)( (100*dsys + divo2) / Div ),
(unsigned)( (100*didl + divo2) / Div ),
(unsigned)( (100*diow + divo2) / Div )
);
for(i=1;i<num_updates;i++) { /* \\\\\\\\\\\\\\\\\\\\ main loop ////////////////// */
sleep(sleep_time);
if (moreheaders && ((i%height)==0)) new_header();
tog= !tog;
meminfo();
getstat(cpu_use+tog,cpu_nic+tog,cpu_sys+tog,cpu_idl+tog,cpu_iow+tog,
pgpgin+tog,pgpgout+tog,pswpin+tog,pswpout+tog,
inter+tog,ticks+tog,ctxt+tog,
&running,&blocked);
duse= cpu_use[tog]-cpu_use[!tog] + cpu_nic[tog]-cpu_nic[!tog];
dsys= cpu_sys[tog]-cpu_sys[!tog];
didl= cpu_idl[tog]-cpu_idl[!tog];
diow= cpu_iow[tog]-cpu_iow[!tog];
/* idle can run backwards for a moment -- kernel "feature" */
if(debt){
didl = (int)didl + debt;
debt = 0;
}
if( (int)didl < 0 ){
debt = (int)didl;
didl = 0;
}
Div= duse+dsys+didl+diow;
divo2= Div/2UL;
printf(format,
running, blocked,
kb_swap_used,kb_main_free,
a_option?kb_inactive:kb_main_buffers,
a_option?kb_active:kb_main_cached,
(unsigned)( ( (pswpin [tog] - pswpin [!tog])*kb_per_page+sleep_half )/sleep_time ),
(unsigned)( ( (pswpout[tog] - pswpout[!tog])*kb_per_page+sleep_half )/sleep_time ),
(unsigned)( ( pgpgin [tog] - pgpgin [!tog] +sleep_half )/sleep_time ),
(unsigned)( ( pgpgout[tog] - pgpgout[!tog] +sleep_half )/sleep_time ),
(unsigned)( ( inter [tog] - inter [!tog] +sleep_half )/sleep_time ),
(unsigned)( ( ctxt [tog] - ctxt [!tog] +sleep_half )/sleep_time ),
(unsigned)( (100*duse+divo2)/Div ),
(unsigned)( (100*dsys+divo2)/Div ),
(unsigned)( (100*didl+divo2)/Div ),
(unsigned)( (100*diow+divo2)/Div )
);
}
}
//////////////////////////////////////////////////////////////////////////////////////
static int winhi(void) {
struct winsize win;
int rows = 24;
if (ioctl(1, TIOCGWINSZ, &win) != -1 && win.ws_row > 0)
rows = win.ws_row;
return rows;
}
int main(int argc, char *argv[]) {
argc=0; /* redefined as number of integer arguments */
for (argv++;*argv;argv++) {
if ('-' ==(**argv)) {
switch (*(++(*argv))) {
case 'V':
display_version();
exit(0);
case 'a':
/* active/inactive mode */
a_option=1;
break;
case 'n':
/* print only one header */
moreheaders=FALSE;
break;
default:
/* no other aguments defined yet. */
usage();
}
} else {
argc++;
switch (argc) {
case 1:
if ((sleep_time = atoi(*argv)) == 0)
usage();
num_updates = ULONG_MAX;
break;
case 2:
num_updates = atol(*argv);
break;
default:
usage();
} /* switch */
}
}
if (moreheaders) {
int tmp=winhi()-3;
height=((tmp>0)?tmp:22);
}
setlinebuf(stdout);
new_format();
return 0;
}
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