/**
* collectd - src/zfs_arc.c
* Copyright (C) 2009 Anthony Dewhurst
+ * Copyright (C) 2012 Aurelien Rougemont
+ * Copyright (C) 2013 Xin Li
*
* 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
*
* Authors:
* Anthony Dewhurst <dewhurst at gmail>
+ * Aurelien Rougemont <beorn at gandi.net>
+ * Xin Li <delphij at FreeBSD.org>
**/
#include "collectd.h"
/*
* Global variables
*/
-static kstat_t *ksp;
+
+#if !defined(__FreeBSD__)
extern kstat_ctl_t *kc;
+static long long get_zfs_value(kstat_t *ksp, char *name)
+{
+
+ return (get_kstat_value(ksp, name));
+}
+#else
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+const char zfs_arcstat[] = "kstat.zfs.misc.arcstats.";
+
+#if !defined(kstat_t)
+typedef void kstat_t;
+#endif
+
+static long long get_zfs_value(kstat_t *dummy __attribute__((unused)),
+ char const *name)
+{
+ char buffer[256];
+ long long value;
+ size_t valuelen = sizeof(value);
+ int rv;
+
+ ssnprintf (buffer, sizeof (buffer), "%s%s", zfs_arcstat, name);
+ rv = sysctlbyname (buffer, (void *) &value, &valuelen,
+ /* new value = */ NULL, /* new length = */ (size_t) 0);
+ if (rv == 0)
+ return (value);
+
+ return (-1);
+}
+#endif
+
static void za_submit (const char* type, const char* type_instance, value_t* values, int values_len)
{
value_list_t vl = VALUE_LIST_INIT;
za_submit (type, type_instance, &vv, 1);
}
-static void za_submit_derive (const char* type, const char* type_instance, derive_t dv)
+static int za_read_derive (kstat_t *ksp, const char *kstat_value,
+ const char *type, const char *type_instance)
{
- value_t vv;
+ long long tmp;
+ value_t v;
+
+ tmp = get_zfs_value (ksp, (char *)kstat_value);
+ if (tmp == -1LL)
+ {
+ ERROR ("zfs_arc plugin: Reading kstat value \"%s\" failed.", kstat_value);
+ return (-1);
+ }
+
+ v.derive = (derive_t) tmp;
+ za_submit (type, type_instance, /* values = */ &v, /* values_num = */ 1);
+ return (0);
+}
- vv.derive = dv;
- za_submit (type, type_instance, &vv, 1);
+static int za_read_gauge (kstat_t *ksp, const char *kstat_value,
+ const char *type, const char *type_instance)
+{
+ long long tmp;
+ value_t v;
+
+ tmp = get_zfs_value (ksp, (char *)kstat_value);
+ if (tmp == -1LL)
+ {
+ ERROR ("zfs_arc plugin: Reading kstat value \"%s\" failed.", kstat_value);
+ return (-1);
+ }
+
+ v.gauge = (gauge_t) tmp;
+ za_submit (type, type_instance, /* values = */ &v, /* values_num = */ 1);
+ return (0);
}
static void za_submit_ratio (const char* type_instance, gauge_t hits, gauge_t misses)
static int za_read (void)
{
- gauge_t arc_size, l2_size;
- derive_t demand_data_hits,
- demand_metadata_hits,
- prefetch_data_hits,
- prefetch_metadata_hits,
- demand_data_misses,
- demand_metadata_misses,
- prefetch_data_misses,
- prefetch_metadata_misses;
- gauge_t arc_hits, arc_misses, arc_ratio, l2_hits, l2_misses, l2_ratio;
+ gauge_t arc_hits, arc_misses, l2_hits, l2_misses;
value_t l2_io[2];
+ kstat_t *ksp = NULL;
+#if !defined(__FreeBSD__)
get_kstat (&ksp, "zfs", 0, "arcstats");
if (ksp == NULL)
{
ERROR ("zfs_arc plugin: Cannot find zfs:0:arcstats kstat.");
return (-1);
}
+#endif
/* Sizes */
- arc_size = get_kstat_value(ksp, "size");
- l2_size = get_kstat_value(ksp, "l2_size");
-
- za_submit_gauge ("cache_size", "arc", arc_size);
- za_submit_gauge ("cache_size", "L2", l2_size);
+ za_read_gauge (ksp, "size", "cache_size", "arc");
+ za_read_gauge (ksp, "l2_size", "cache_size", "L2");
+
+ /* Operations */
+ za_read_derive (ksp, "allocated","cache_operation", "allocated");
+ za_read_derive (ksp, "deleted", "cache_operation", "deleted");
+ za_read_derive (ksp, "stolen", "cache_operation", "stolen");
+
+ /* Issue indicators */
+ za_read_derive (ksp, "mutex_miss", "mutex_operations", "miss");
+ za_read_derive (ksp, "hash_collisions", "hash_collisions", "");
+
+ /* Evictions */
+ za_read_derive (ksp, "evict_l2_cached", "cache_eviction", "cached");
+ za_read_derive (ksp, "evict_l2_eligible", "cache_eviction", "eligible");
+ za_read_derive (ksp, "evict_l2_ineligible", "cache_eviction", "ineligible");
/* Hits / misses */
- demand_data_hits = get_kstat_value(ksp, "demand_data_hits");
- demand_metadata_hits = get_kstat_value(ksp, "demand_metadata_hits");
- prefetch_data_hits = get_kstat_value(ksp, "prefetch_data_hits");
- prefetch_metadata_hits = get_kstat_value(ksp, "prefetch_metadata_hits");
-
- demand_data_misses = get_kstat_value(ksp, "demand_data_misses");
- demand_metadata_misses = get_kstat_value(ksp, "demand_metadata_misses");
- prefetch_data_misses = get_kstat_value(ksp, "prefetch_data_misses");
- prefetch_metadata_misses = get_kstat_value(ksp, "prefetch_metadata_misses");
-
- za_submit_derive ("cache_result", "demand_data-hit", demand_data_hits);
- za_submit_derive ("cache_result", "demand_metadata-hit", demand_metadata_hits);
- za_submit_derive ("cache_result", "prefetch_data-hit", prefetch_data_hits);
- za_submit_derive ("cache_result", "prefetch_metadata-hit", prefetch_metadata_hits);
-
- za_submit_derive ("cache_result", "demand_data-miss", demand_data_misses);
- za_submit_derive ("cache_result", "demand_metadata-miss", demand_metadata_misses);
- za_submit_derive ("cache_result", "prefetch_data-miss", prefetch_data_misses);
- za_submit_derive ("cache_result", "prefetch_metadata-miss", prefetch_metadata_misses);
+ za_read_derive (ksp, "demand_data_hits", "cache_result", "demand_data-hit");
+ za_read_derive (ksp, "demand_metadata_hits", "cache_result", "demand_metadata-hit");
+ za_read_derive (ksp, "prefetch_data_hits", "cache_result", "prefetch_data-hit");
+ za_read_derive (ksp, "prefetch_metadata_hits", "cache_result", "prefetch_metadata-hit");
+ za_read_derive (ksp, "demand_data_misses", "cache_result", "demand_data-miss");
+ za_read_derive (ksp, "demand_metadata_misses", "cache_result", "demand_metadata-miss");
+ za_read_derive (ksp, "prefetch_data_misses", "cache_result", "prefetch_data-miss");
+ za_read_derive (ksp, "prefetch_metadata_misses", "cache_result", "prefetch_metadata-miss");
/* Ratios */
- arc_hits = (gauge_t) get_kstat_value(ksp, "hits");
- arc_misses = (gauge_t) get_kstat_value(ksp, "misses");
- l2_hits = (gauge_t) get_kstat_value(ksp, "l2_hits");
- l2_misses = (gauge_t) get_kstat_value(ksp, "l2_misses");
+ arc_hits = (gauge_t) get_zfs_value(ksp, "hits");
+ arc_misses = (gauge_t) get_zfs_value(ksp, "misses");
+ l2_hits = (gauge_t) get_zfs_value(ksp, "l2_hits");
+ l2_misses = (gauge_t) get_zfs_value(ksp, "l2_misses");
za_submit_ratio ("arc", arc_hits, arc_misses);
za_submit_ratio ("L2", l2_hits, l2_misses);
/* I/O */
- l2_io[0].derive = get_kstat_value(ksp, "l2_read_bytes");
- l2_io[1].derive = get_kstat_value(ksp, "l2_write_bytes");
+ l2_io[0].derive = get_zfs_value(ksp, "l2_read_bytes");
+ l2_io[1].derive = get_zfs_value(ksp, "l2_write_bytes");
za_submit ("io_octets", "L2", l2_io, /* num values = */ 2);
static int za_init (void) /* {{{ */
{
- ksp = NULL;
-
+#if !defined(__FreeBSD__)
/* kstats chain already opened by update_kstat (using *kc), verify everything went fine. */
if (kc == NULL)
{
ERROR ("zfs_arc plugin: kstat chain control structure not available.");
return (-1);
}
+#endif
return (0);
} /* }}} int za_init */