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/*
* Copyright (C) 2010 Max Matveev. 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Extract information about ZFS' Adjustable Replacement Cache
*
* The stats are in the sections called "arc_stats" of module zfs
*/
#include <kstat.h>
#include "common.h"
static kstat_t *arcstats;
int arcstats_fresh;
void
arcstats_refresh(void)
{
kstat_ctl_t *kc;
arcstats_fresh = 0;
if ((kc = kstat_ctl_update()) == NULL)
return;
if ((arcstats = kstat_lookup(kc, "zfs", -1, "arcstats")) != NULL)
arcstats_fresh = kstat_read(kc, arcstats, NULL) != -1;
}
int
arcstats_fetch(pmdaMetric *pm, int inst, pmAtomValue *av)
{
metricdesc_t *md = pm->m_user;
char *metric = (char *)md->md_offset;
kstat_named_t *kn;
if (!arcstats_fresh)
return 0;
if ((kn = kstat_data_lookup(arcstats, metric)) != NULL)
return kstat_named_to_pmAtom(kn, av);
return 0;
}
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