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/*
* Copyright (c) 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 "common.h"
static int ndisk;
static int ndisk_alloc;
static int *fetched;
static perfstat_disk_t *diskstat;
void
disk_init(int first)
{
perfstat_id_t id;
int i;
if (!first)
/* TODO ... not sure if/when we'll use this re-init hook */
return;
ndisk = perfstat_disk(NULL, NULL, sizeof(perfstat_disk_t), 0);
if ((fetched = (int *)malloc(ndisk * sizeof(int))) == NULL) {
fprintf(stderr, "disk_init: fetched malloc[%d] failed: %s\n",
ndisk * sizeof(int), osstrerror());
exit(1);
}
if ((diskstat = (perfstat_disk_t *)malloc(ndisk * sizeof(perfstat_disk_t))) == NULL) {
fprintf(stderr, "disk_init: diskstat malloc[%d] failed: %s\n",
ndisk * sizeof(perfstat_disk_t), osstrerror());
exit(1);
}
ndisk_alloc = ndisk;
/*
* set up instance domain
*/
strcpy(id.name, "");
ndisk = perfstat_disk(&id, diskstat, sizeof(perfstat_disk_t), ndisk_alloc);
indomtab[DISK_INDOM].it_numinst = ndisk;
indomtab[DISK_INDOM].it_set = (pmdaInstid *)malloc(ndisk * sizeof(pmdaInstid));
if (indomtab[DISK_INDOM].it_set == NULL) {
fprintf(stderr, "disk_init: indomtab malloc[%d] failed: %s\n",
ndisk * sizeof(pmdaInstid), osstrerror());
exit(1);
}
for (i = 0; i < ndisk; i++) {
indomtab[DISK_INDOM].it_set[i].i_inst = i;
indomtab[DISK_INDOM].it_set[i].i_name = strdup(diskstat[i].name);
}
#ifdef PCP_DEBUG
if ((pmDebug & (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) == (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) {
/* desperate */
fprintf(stderr, "disk_init: ndisk=%d\n", ndisk);
}
#endif
}
void
disk_prefetch(void)
{
int i;
for (i = 0; i < ndisk_alloc; i++)
fetched[i] = 0;
}
static __uint64_t
disk_derived(pmdaMetric *mdesc, int inst)
{
pmID pmid;
__pmID_int *ip = (__pmID_int *)&pmid;
__uint64_t val;
pmid = mdesc->m_desc.pmid;
ip->domain = 0;
switch (pmid) {
case PMDA_PMID(0,55): /* disk.dev.total_bytes */
val = diskstat[inst].rblks + diskstat[inst].wblks;
break;
default:
fprintf(stderr, "disk_derived: Botch: no method for pmid %s\n",
pmIDStr(mdesc->m_desc.pmid));
val = 0;
break;
}
#ifdef PCP_DEBUG
if ((pmDebug & (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) == (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) {
/* desperate */
fprintf(stderr, "disk_derived: pmid %s inst %d val %llu\n",
pmIDStr(mdesc->m_desc.pmid), inst, val);
}
#endif
return val;
}
int
disk_fetch(pmdaMetric *mdesc, int inst, pmAtomValue *atom)
{
int offset;
if (fetched[inst] == 0) {
int sts;
int i;
perfstat_id_t id;
strcpy(id.name, "");
sts = perfstat_disk(&id, diskstat, sizeof(perfstat_disk_t), ndisk_alloc);
/* TODO ...
* - if sts != ndisk, the number of disks has changed, need to set
* fetched[i] to -1 for the missing ones
* - is sts > ndisk possible? worse, if the number of disks is >
* ndisk_alloc what should we do?
* - possibly reshape the instance domain?
* - error handling?
*/
for (i = 0; i < ndisk; i++) {
fetched[i] = 1;
}
}
if (fetched[inst] != 1)
return 0;
offset = ((metricdesc_t *)mdesc->m_user)->md_offset;
if (offset == OFF_NOVALUES)
return 0;
if (mdesc->m_desc.type == PM_TYPE_U64) {
if (offset == OFF_DERIVED)
atom->ull = disk_derived(mdesc, inst);
else {
__uint64_t *ullp;
ullp = (__uint64_t *)&((char *)&diskstat[inst])[offset];
atom->ull = *ullp;
}
if (mdesc->m_desc.units.scaleTime == PM_TIME_MSEC) {
/* assumed to be CPU time */
atom->ull *= 1000 / HZ;
}
#ifdef PCP_DEBUG
if ((pmDebug & (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) == (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) {
/* desperate */
fprintf(stderr, "disk_fetch: pmid %s inst %d val %llu\n",
pmIDStr(mdesc->m_desc.pmid), inst, atom->ull);
}
#endif
}
else {
if (offset == OFF_DERIVED)
atom->ul = (__uint32_t)disk_derived(mdesc, inst);
else {
__uint32_t *ulp;
ulp = (__uint32_t *)&((char *)&diskstat[inst])[offset];
atom->ul = *ulp;
}
if (mdesc->m_desc.units.scaleTime == PM_TIME_MSEC) {
/* assumed to be CPU time */
atom->ul *= 1000 / HZ;
}
#ifdef PCP_DEBUG
if ((pmDebug & (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) == (DBG_TRACE_APPL0|DBG_TRACE_APPL2)) {
/* desperate */
fprintf(stderr, "disk_fetch: pmid %s inst %d val %lu\n",
pmIDStr(mdesc->m_desc.pmid), inst, atom->ul);
}
#endif
}
return 1;
}
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