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/*
* Linux /proc/stat metrics cluster
*
* Copyright (c) 2012-2014 Red Hat.
* Copyright (c) 2008-2009 Aconex. All Rights Reserved.
* Copyright (c) 2000,2004-2008 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 "indom.h"
#include <dirent.h>
#include <ctype.h>
#include <sys/stat.h>
#include "proc_cpuinfo.h"
#include "proc_stat.h"
int
refresh_proc_stat(proc_cpuinfo_t *proc_cpuinfo, proc_stat_t *proc_stat)
{
pmdaIndom *idp = PMDAINDOM(CPU_INDOM);
char buf[MAXPATHLEN];
char fmt[64];
static int fd = -1; /* kept open until exit() */
static int started;
static char *statbuf;
static int maxstatbuf;
static char **bufindex;
static int nbufindex;
static int maxbufindex;
int size;
int n;
int i;
int j;
if (fd >= 0) {
if (lseek(fd, 0, SEEK_SET) < 0)
return -oserror();
} else {
snprintf(buf, sizeof(buf), "%s/proc/stat", linux_statspath);
if ((fd = open(buf, O_RDONLY)) < 0)
return -oserror();
}
for (n=0;;) {
while (n >= maxstatbuf) {
size = maxstatbuf + 512;
if ((statbuf = (char *)realloc(statbuf, size)) == NULL)
return -ENOMEM;
maxstatbuf = size;
}
size = (statbuf + maxstatbuf) - (statbuf + n);
if ((i = read(fd, statbuf + n, size)) > 0)
n += i;
else
break;
}
statbuf[n] = '\0';
if (bufindex == NULL) {
size = 4 * sizeof(char *);
if ((bufindex = (char **)malloc(size)) == NULL)
return -ENOMEM;
maxbufindex = 4;
}
nbufindex = 0;
bufindex[nbufindex] = statbuf;
for (i=0; i < n; i++) {
if (statbuf[i] == '\n' || statbuf[i] == '\0') {
statbuf[i] = '\0';
if (nbufindex + 1 >= maxbufindex) {
size = (maxbufindex + 4) * sizeof(char *);
if ((bufindex = (char **)realloc(bufindex, size)) == NULL)
return -ENOMEM;
maxbufindex += 4;
}
bufindex[++nbufindex] = statbuf + i + 1;
}
}
if (!started) {
started = 1;
memset(proc_stat, 0, sizeof(*proc_stat));
/* hz of running kernel */
proc_stat->hz = sysconf(_SC_CLK_TCK);
/* scan ncpus */
for (i=0; i < nbufindex; i++) {
if (strncmp("cpu", bufindex[i], 3) == 0 && isdigit((int)bufindex[i][3]))
proc_stat->ncpu++;
}
if (proc_stat->ncpu == 0)
proc_stat->ncpu = 1; /* non-SMP kernel? */
proc_stat->cpu_indom = idp;
proc_stat->cpu_indom->it_numinst = proc_stat->ncpu;
proc_stat->cpu_indom->it_set = (pmdaInstid *)malloc(
proc_stat->ncpu * sizeof(pmdaInstid));
/*
* Map out the CPU instance domain.
*
* The first call to cpu_name() does initialization on the
* proc_cpuinfo structure.
*/
for (i=0; i < proc_stat->ncpu; i++) {
proc_stat->cpu_indom->it_set[i].i_inst = i;
proc_stat->cpu_indom->it_set[i].i_name = cpu_name(proc_cpuinfo, i);
}
n = proc_stat->ncpu * sizeof(unsigned long long);
proc_stat->p_user = (unsigned long long *)calloc(1, n);
proc_stat->p_nice = (unsigned long long *)calloc(1, n);
proc_stat->p_sys = (unsigned long long *)calloc(1, n);
proc_stat->p_idle = (unsigned long long *)calloc(1, n);
proc_stat->p_wait = (unsigned long long *)calloc(1, n);
proc_stat->p_irq = (unsigned long long *)calloc(1, n);
proc_stat->p_sirq = (unsigned long long *)calloc(1, n);
proc_stat->p_steal = (unsigned long long *)calloc(1, n);
proc_stat->p_guest = (unsigned long long *)calloc(1, n);
n = proc_cpuinfo->node_indom->it_numinst * sizeof(unsigned long long);
proc_stat->n_user = calloc(1, n);
proc_stat->n_nice = calloc(1, n);
proc_stat->n_sys = calloc(1, n);
proc_stat->n_idle = calloc(1, n);
proc_stat->n_wait = calloc(1, n);
proc_stat->n_irq = calloc(1, n);
proc_stat->n_sirq = calloc(1, n);
proc_stat->n_steal = calloc(1, n);
proc_stat->n_guest = calloc(1, n);
}
else {
/* reset per-node stats */
n = proc_cpuinfo->node_indom->it_numinst * sizeof(unsigned long long);
memset(proc_stat->n_user, 0, n);
memset(proc_stat->n_nice, 0, n);
memset(proc_stat->n_sys, 0, n);
memset(proc_stat->n_idle, 0, n);
memset(proc_stat->n_wait, 0, n);
memset(proc_stat->n_irq, 0, n);
memset(proc_stat->n_sirq, 0, n);
memset(proc_stat->n_steal, 0, n);
memset(proc_stat->n_guest, 0, n);
}
/*
* cpu 95379 4 20053 6502503
* 2.6 kernels have 3 additional fields
* for wait, irq and soft_irq.
*/
strcpy(fmt, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu");
n = sscanf((const char *)bufindex[0], fmt,
&proc_stat->user, &proc_stat->nice,
&proc_stat->sys, &proc_stat->idle,
&proc_stat->wait, &proc_stat->irq,
&proc_stat->sirq, &proc_stat->steal,
&proc_stat->guest);
/*
* per-cpu stats
* e.g. cpu0 95379 4 20053 6502503
* 2.6 kernels have 3 additional fields for wait, irq and soft_irq.
* More recent (2008) 2.6 kernels have an extra field for guest.
*/
if (proc_stat->ncpu == 1) {
/*
* Don't bother scanning - the counters are the same
* as for "all" cpus, as already scanned above.
* This also handles the non-SMP code where
* there is no line starting with "cpu0".
*/
proc_stat->p_user[0] = proc_stat->user;
proc_stat->p_nice[0] = proc_stat->nice;
proc_stat->p_sys[0] = proc_stat->sys;
proc_stat->p_idle[0] = proc_stat->idle;
proc_stat->p_wait[0] = proc_stat->wait;
proc_stat->p_irq[0] = proc_stat->irq;
proc_stat->p_sirq[0] = proc_stat->sirq;
proc_stat->p_steal[0] = proc_stat->steal;
proc_stat->p_guest[0] = proc_stat->guest;
}
else {
strcpy(fmt, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu");
for (i=0; i < proc_stat->ncpu; i++) {
for (j=0; j < nbufindex; j++) {
if (strncmp("cpu", bufindex[j], 3) == 0 && isdigit((int)bufindex[j][3])) {
int c;
int cpunum = atoi(&bufindex[j][3]);
int node;
if (cpunum >= 0 && cpunum < proc_stat->ncpu) {
n = sscanf(bufindex[j], fmt, &c,
&proc_stat->p_user[cpunum],
&proc_stat->p_nice[cpunum],
&proc_stat->p_sys[cpunum],
&proc_stat->p_idle[cpunum],
&proc_stat->p_wait[cpunum],
&proc_stat->p_irq[cpunum],
&proc_stat->p_sirq[cpunum],
&proc_stat->p_steal[cpunum],
&proc_stat->p_guest[cpunum]);
if ((node = proc_cpuinfo->cpuinfo[cpunum].node) != -1) {
proc_stat->n_user[node] += proc_stat->p_user[cpunum];
proc_stat->n_nice[node] += proc_stat->p_nice[cpunum];
proc_stat->n_sys[node] += proc_stat->p_sys[cpunum];
proc_stat->n_idle[node] += proc_stat->p_idle[cpunum];
proc_stat->n_wait[node] += proc_stat->p_wait[cpunum];
proc_stat->n_irq[node] += proc_stat->p_irq[cpunum];
proc_stat->n_sirq[node] += proc_stat->p_sirq[cpunum];
proc_stat->n_steal[node] += proc_stat->p_steal[cpunum];
proc_stat->n_guest[node] += proc_stat->p_guest[cpunum];
}
}
}
}
if (j == nbufindex)
break;
}
}
/*
* page 59739 34786
* Note: this has moved to /proc/vmstat in 2.6 kernels
*/
strcpy(fmt, "page %u %u");
for (j=0; j < nbufindex; j++) {
if (strncmp(fmt, bufindex[j], 5) == 0) {
sscanf((const char *)bufindex[j], fmt,
&proc_stat->page[0], &proc_stat->page[1]);
break;
}
}
/*
* swap 0 1
* Note: this has moved to /proc/vmstat in 2.6 kernels
*/
strcpy(fmt, "swap %u %u");
for (j=0; j < nbufindex; j++) {
if (strncmp(fmt, bufindex[j], 5) == 0) {
sscanf((const char *)bufindex[j], fmt,
&proc_stat->swap[0], &proc_stat->swap[1]);
break;
}
}
/*
* intr 32845463 24099228 2049 0 2 ....
* (just export the first number, which is total interrupts)
*/
strcpy(fmt, "intr %llu");
for (j=0; j < nbufindex; j++) {
if (strncmp(fmt, bufindex[j], 5) == 0) {
sscanf((const char *)bufindex[j], fmt, &proc_stat->intr);
break;
}
}
/*
* ctxt 1733480
*/
strcpy(fmt, "ctxt %llu");
for (j=0; j < nbufindex; j++) {
if (strncmp(fmt, bufindex[j], 5) == 0) {
sscanf((const char *)bufindex[j], fmt, &proc_stat->ctxt);
break;
}
}
/*
* btime 1733480
*/
strcpy(fmt, "btime %lu");
for (j=0; j < nbufindex; j++) {
if (strncmp(fmt, bufindex[j], 6) == 0) {
sscanf((const char *)bufindex[j], fmt, &proc_stat->btime);
break;
}
}
/*
* processes 2213
*/
strcpy(fmt, "processes %lu");
for (j=0; j < nbufindex; j++) {
if (strncmp(fmt, bufindex[j], 10) == 0) {
sscanf((const char *)bufindex[j], fmt, &proc_stat->processes);
break;
}
}
/* success */
return 0;
}
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