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/*
* Linux Memory Slab Cluster
*
* Copyright (c) 2014 Red Hat.
* 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 <ctype.h>
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include "indom.h"
#include "proc_slabinfo.h"
int
refresh_proc_slabinfo(proc_slabinfo_t *slabinfo)
{
char buf[1024];
slab_cache_t sbuf;
slab_cache_t *s;
FILE *fp;
int i, n;
int instcount;
char *w, *p;
int old_cache;
int err = 0;
static int next_id = -1;
static int major_version = -1;
static int minor_version = 0;
if (next_id < 0) {
/* one trip initialization */
next_id = 0;
slabinfo->ncaches = 0;
slabinfo->caches = (slab_cache_t *)malloc(sizeof(slab_cache_t));
slabinfo->indom->it_numinst = 0;
slabinfo->indom->it_set = (pmdaInstid *)malloc(sizeof(pmdaInstid));
}
if ((fp = linux_statsfile("/proc/slabinfo", buf, sizeof(buf))) == NULL)
return -oserror();
for (i=0; i < slabinfo->ncaches; i++)
slabinfo->caches[i].seen = 0;
/* skip header */
if (fgets(buf, sizeof(buf), fp) == NULL) {
/* oops, no header! */
err = -oserror();
goto out;
}
if (major_version < 0) {
major_version = minor_version = 0;
if (strstr(buf, "slabinfo - version:")) {
char *p;
for (p=buf; *p; p++) {
if (isdigit((int)*p)) {
sscanf(p, "%d.%d", &major_version, &minor_version);
break;
}
}
}
}
while (fgets(buf, sizeof(buf), fp) != NULL) {
/* try to convert whitespace in cache names to underscores, */
/* by looking for alphabetic chars which follow whitespace. */
if (buf[0] == '#')
continue;
for (w = NULL, p = buf; *p != '\0'; p++) {
if (isspace((int)*p))
w = p;
else if (isdigit((int)*p))
break;
else if (isalpha((int)*p) && w) {
for (; w && w != p; w++)
*w = '_';
w = NULL;
}
}
memset(&sbuf, 0, sizeof(slab_cache_t));
if (major_version == 1 && minor_version == 0) {
/*
* <name> <active_objs> <num_objs>
* (generally 2.2 kernels)
*/
n = sscanf(buf, "%s %lu %lu", sbuf.name,
(unsigned long *)&sbuf.num_active_objs,
(unsigned long *)&sbuf.total_objs);
if (n != 3) {
err = PM_ERR_APPVERSION;
goto out;
}
}
else if (major_version == 1 && minor_version == 1) {
/*
* <name> <active_objs> <num_objs> <objsize> <active_slabs> <num_slabs> <pagesperslab>
* (generally 2.4 kernels)
*/
n = sscanf(buf, "%s %lu %lu %u %u %u %u", sbuf.name,
(unsigned long *)&sbuf.num_active_objs,
(unsigned long *)&sbuf.total_objs,
&sbuf.object_size,
&sbuf.num_active_slabs,
&sbuf.total_slabs,
&sbuf.pages_per_slab);
if (n != 7) {
err = PM_ERR_APPVERSION;
goto out;
}
sbuf.total_size = sbuf.pages_per_slab * sbuf.num_active_slabs * _pm_system_pagesize;
}
else if (major_version == 2 && minor_version >= 0 && minor_version <= 1) {
/*
* <name> <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> .. and more
* (generally for kernels up to at least 2.6.11)
*/
n = sscanf(buf, "%s %lu %lu %u %u %u", sbuf.name,
(unsigned long *)&sbuf.num_active_objs,
(unsigned long *)&sbuf.total_objs,
&sbuf.object_size,
&sbuf.objects_per_slab,
&sbuf.pages_per_slab);
if (n != 6) {
err = PM_ERR_APPVERSION;
goto out;
}
sbuf.total_size = sbuf.pages_per_slab * sbuf.num_active_objs * _pm_system_pagesize / sbuf.objects_per_slab;
}
else {
/* no support */
err = PM_ERR_APPVERSION;
goto out;
}
old_cache = -1;
for (i=0; i < slabinfo->ncaches; i++) {
if (strcmp(slabinfo->caches[i].name, sbuf.name) == 0) {
if (slabinfo->caches[i].valid)
break;
else
old_cache = i;
}
}
if (i == slabinfo->ncaches) {
/* new cache has appeared */
if (old_cache >= 0) {
/* same cache as last time : reuse the id */
i = old_cache;
}
else {
slabinfo->ncaches++;
slabinfo->caches = (slab_cache_t *)realloc(slabinfo->caches,
slabinfo->ncaches * sizeof(slab_cache_t));
slabinfo->caches[i].id = next_id++;
}
slabinfo->caches[i].valid = 1;
#if PCP_DEBUG
if (pmDebug & DBG_TRACE_LIBPMDA) {
fprintf(stderr, "refresh_slabinfo: add \"%s\"\n", sbuf.name);
}
#endif
}
s = &slabinfo->caches[i];
strcpy(s->name, sbuf.name);
s->num_active_objs = sbuf.num_active_objs;
s->total_objs = sbuf.total_objs;
s->object_size = sbuf.object_size;
s->num_active_slabs = sbuf.num_active_slabs;
s->total_slabs = sbuf.total_slabs;
s->pages_per_slab = sbuf.pages_per_slab;
s->objects_per_slab = sbuf.objects_per_slab;
s->total_size = sbuf.total_size;
s->seen = major_version * 10 + minor_version;
}
/* check for caches that have been deleted (eg. by rmmod) */
for (i=0, instcount=0; i < slabinfo->ncaches; i++) {
if (slabinfo->caches[i].valid) {
if (slabinfo->caches[i].seen == 0) {
slabinfo->caches[i].valid = 0;
#if PCP_DEBUG
if (pmDebug & DBG_TRACE_LIBPMDA) {
fprintf(stderr, "refresh_slabinfo: drop \"%s\"\n", slabinfo->caches[i].name);
}
#endif
}
else {
instcount++;
}
}
}
/* refresh slabinfo indom */
if (slabinfo->indom->it_numinst != instcount) {
slabinfo->indom->it_numinst = instcount;
slabinfo->indom->it_set = (pmdaInstid *)realloc(slabinfo->indom->it_set,
instcount * sizeof(pmdaInstid));
memset(slabinfo->indom->it_set, 0, instcount * sizeof(pmdaInstid));
}
for (n=0, i=0; i < slabinfo->ncaches; i++) {
if (slabinfo->caches[i].valid) {
slabinfo->indom->it_set[n].i_inst = slabinfo->caches[i].id;
slabinfo->indom->it_set[n].i_name = slabinfo->caches[i].name;
#if PCP_DEBUG
if (pmDebug & DBG_TRACE_LIBPMDA) {
fprintf(stderr, "refresh_slabinfo: cache[%d] = \"%s\"\n",
n, slabinfo->indom->it_set[n].i_name);
}
#endif
n++;
}
}
out:
fclose(fp);
return err;
}
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