2 * collectd - src/zfs_arc.c
3 * Copyright (C) 2009 Anthony Dewhurst
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Anthony Dewhurst <dewhurst at gmail>
30 extern kstat_ctl_t *kc;
32 static void za_submit (const char* type, const char* type_instance, value_t* values, int values_len)
34 value_list_t vl = VALUE_LIST_INIT;
37 vl.values_len = values_len;
39 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
40 sstrncpy (vl.plugin, "zfs_arc", sizeof (vl.plugin));
41 sstrncpy (vl.type, type, sizeof (vl.type));
42 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
44 plugin_dispatch_values (&vl);
47 static void za_submit_gauge (const char* type, const char* type_instance, gauge_t value)
52 za_submit (type, type_instance, &vv, 1);
55 static void za_submit_derive (const char* type, const char* type_instance, derive_t dv)
60 za_submit (type, type_instance, &vv, 1);
63 static void za_submit_ratio (const char* type_instance, gauge_t hits, gauge_t misses)
67 if (!isfinite (hits) || (hits < 0.0))
69 if (!isfinite (misses) || (misses < 0.0))
72 if ((hits != 0.0) || (misses != 0.0))
73 ratio = hits / (hits + misses);
75 za_submit_gauge ("cache_ratio", type_instance, ratio);
78 static int za_read (void)
80 gauge_t arc_size, l2_size;
81 derive_t demand_data_hits,
84 prefetch_metadata_hits,
86 demand_metadata_misses,
88 prefetch_metadata_misses;
89 gauge_t arc_hits, arc_misses, l2_hits, l2_misses;
93 get_kstat (&ksp, "zfs", 0, "arcstats");
96 ERROR ("zfs_arc plugin: Cannot find zfs:0:arcstats kstat.");
101 arc_size = get_kstat_value(ksp, "size");
102 l2_size = get_kstat_value(ksp, "l2_size");
104 za_submit_gauge ("cache_size", "arc", arc_size);
105 za_submit_gauge ("cache_size", "L2", l2_size);
108 demand_data_hits = get_kstat_value(ksp, "demand_data_hits");
109 demand_metadata_hits = get_kstat_value(ksp, "demand_metadata_hits");
110 prefetch_data_hits = get_kstat_value(ksp, "prefetch_data_hits");
111 prefetch_metadata_hits = get_kstat_value(ksp, "prefetch_metadata_hits");
113 demand_data_misses = get_kstat_value(ksp, "demand_data_misses");
114 demand_metadata_misses = get_kstat_value(ksp, "demand_metadata_misses");
115 prefetch_data_misses = get_kstat_value(ksp, "prefetch_data_misses");
116 prefetch_metadata_misses = get_kstat_value(ksp, "prefetch_metadata_misses");
118 za_submit_derive ("cache_result", "demand_data-hit", demand_data_hits);
119 za_submit_derive ("cache_result", "demand_metadata-hit", demand_metadata_hits);
120 za_submit_derive ("cache_result", "prefetch_data-hit", prefetch_data_hits);
121 za_submit_derive ("cache_result", "prefetch_metadata-hit", prefetch_metadata_hits);
123 za_submit_derive ("cache_result", "demand_data-miss", demand_data_misses);
124 za_submit_derive ("cache_result", "demand_metadata-miss", demand_metadata_misses);
125 za_submit_derive ("cache_result", "prefetch_data-miss", prefetch_data_misses);
126 za_submit_derive ("cache_result", "prefetch_metadata-miss", prefetch_metadata_misses);
129 arc_hits = (gauge_t) get_kstat_value(ksp, "hits");
130 arc_misses = (gauge_t) get_kstat_value(ksp, "misses");
131 l2_hits = (gauge_t) get_kstat_value(ksp, "l2_hits");
132 l2_misses = (gauge_t) get_kstat_value(ksp, "l2_misses");
134 za_submit_ratio ("arc", arc_hits, arc_misses);
135 za_submit_ratio ("L2", l2_hits, l2_misses);
138 l2_io[0].derive = get_kstat_value(ksp, "l2_read_bytes");
139 l2_io[1].derive = get_kstat_value(ksp, "l2_write_bytes");
141 za_submit ("io_octets", "L2", l2_io, /* num values = */ 2);
146 static int za_init (void) /* {{{ */
148 /* kstats chain already opened by update_kstat (using *kc), verify everything went fine. */
151 ERROR ("zfs_arc plugin: kstat chain control structure not available.");
156 } /* }}} int za_init */
158 void module_register (void)
160 plugin_register_init ("zfs_arc", za_init);
161 plugin_register_read ("zfs_arc", za_read);
162 } /* void module_register */
164 /* vmi: set sw=8 noexpandtab fdm=marker : */