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/*
* Linux /proc/runq metrics cluster
*
* Copyright (c) 2000,2004 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include <ctype.h>
#include <dirent.h>
#include <sys/stat.h>
#include "proc_pid.h"
#include "proc_runq.h"
int
refresh_proc_runq(proc_runq_t *proc_runq)
{
int sz;
int fd;
char *p;
int sname;
DIR *dir;
struct dirent *d;
char fullpath[MAXPATHLEN];
char buf[4096];
memset(proc_runq, 0, sizeof(proc_runq_t));
if ((dir = opendir("/proc")) == NULL)
return -oserror();
while((d = readdir(dir)) != NULL) {
if (!isdigit((int)d->d_name[0]))
continue;
sprintf(fullpath, "/proc/%s/stat", d->d_name);
if ((fd = open(fullpath, O_RDONLY)) < 0)
continue;
sz = read(fd, buf, sizeof(buf));
close(fd);
buf[sizeof(buf)-1] = '\0';
/*
* defunct (state name is 'Z')
*/
if (sz <= 0 || (p = _pm_getfield(buf, PROC_PID_STAT_STATE)) == NULL) {
proc_runq->unknown++;
continue;
}
if ((sname = *p) == 'Z') {
proc_runq->defunct++;
continue;
}
/*
* kernel process (not defunct and virtual size is zero)
*/
if ((p = _pm_getfield(buf, PROC_PID_STAT_VSIZE)) == NULL) {
proc_runq->unknown++;
continue;
}
if (strcmp(p, "0") == 0) {
proc_runq->kernel++;
continue;
}
/*
* swapped (resident set size is zero)
*/
if ((p = _pm_getfield(buf, PROC_PID_STAT_RSS)) == NULL) {
proc_runq->unknown++;
continue;
}
if (strcmp(p, "0") == 0) {
proc_runq->swapped++;
continue;
}
/*
* All other states
*/
switch (sname) {
case 'R':
proc_runq->runnable++;
break;
case 'S':
proc_runq->sleeping++;
break;
case 'T':
proc_runq->stopped++;
break;
case 'D':
proc_runq->blocked++;
break;
/* case 'Z':
break; -- already counted above */
default:
fprintf(stderr, "UNKNOWN %c : %s\n", sname, buf);
proc_runq->unknown++;
break;
}
}
closedir(dir);
#if PCP_DEBUG
if (pmDebug & DBG_TRACE_LIBPMDA) {
fprintf(stderr, "refresh_runq: runnable=%d sleeping=%d stopped=%d blocked=%d unknown=%d\n",
proc_runq->runnable, proc_runq->sleeping, proc_runq->stopped,
proc_runq->blocked, proc_runq->unknown);
}
#endif
return 0;
}
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