--- /dev/null
+/**
+ * collectd - src/zfs_arc.c
+ * Copyright (C) 2009 Anthony Dewhurst
+ *
+ * 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; only version 2 of the License is applicable.
+ *
+ * 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Authors:
+ * Anthony Dewhurst <dewhurst at gmail>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+
+/*
+ * Global variables
+ */
+static kstat_t *ksp;
+extern kstat_ctl_t *kc;
+
+static void za_submit (const char* type, const char* type_instance, value_t* values, int values_len)
+{
+ value_list_t vl = VALUE_LIST_INIT;
+
+ vl.values = values;
+ vl.values_len = values_len;
+
+ sstrncpy (vl.host, hostname_g, sizeof (vl.host));
+ sstrncpy (vl.plugin, "zfs_arc", sizeof (vl.plugin));
+ sstrncpy (vl.type, type, sizeof (vl.type));
+ sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
+
+ plugin_dispatch_values (&vl);
+}
+
+static void za_submit_gauge (const char* type, const char* type_instance, gauge_t value)
+{
+ value_t values[1];
+
+ values[0].gauge = value;
+
+ za_submit (type, type_instance, values, STATIC_ARRAY_SIZE(values));
+}
+
+static void za_submit_size (gauge_t size, gauge_t size_target, gauge_t limit_min, gauge_t limit_max)
+{
+ value_t values[4];
+
+ values[0].gauge = size;
+ values[1].gauge = size_target;
+ values[2].gauge = limit_min;
+ values[3].gauge = limit_max;
+
+ za_submit ("arc_size", "", values, STATIC_ARRAY_SIZE(values));
+}
+
+static void za_submit_bytes (counter_t read, counter_t write)
+{
+ value_t values[2];
+
+ values[0].counter = read;
+ values[1].counter = write;
+
+ za_submit ("arc_l2_bytes", "", values, STATIC_ARRAY_SIZE(values));
+}
+
+static void za_submit_counts (char *type_instance, counter_t demand_data, counter_t demand_metadata,
+ counter_t prefetch_data, counter_t prefetch_metadata)
+{
+ value_t values[4];
+
+ values[0].counter = demand_data;
+ values[1].counter = demand_metadata;
+ values[2].counter = prefetch_data;
+ values[3].counter = prefetch_metadata;
+
+ za_submit ("arc_counts", type_instance, values, STATIC_ARRAY_SIZE(values));
+}
+
+static int za_read (void)
+{
+ gauge_t arcsize, targetsize, minlimit, maxlimit, hits, misses, l2_size, l2_hits, l2_misses;
+ counter_t demand_data_hits, demand_metadata_hits, prefetch_data_hits, prefetch_metadata_hits;
+ counter_t demand_data_misses, demand_metadata_misses, prefetch_data_misses, prefetch_metadata_misses;
+ counter_t l2_read_bytes, l2_write_bytes;
+
+ get_kstat (&ksp, "zfs", 0, "arcstats");
+ if (ksp == NULL)
+ {
+ ERROR ("zfs_arc plugin: Cannot find zfs:0:arcstats kstat.");
+ return (-1);
+ }
+
+ arcsize = get_kstat_value(ksp, "size");
+ targetsize = get_kstat_value(ksp, "c");
+ minlimit = get_kstat_value(ksp, "c_min");
+ maxlimit = get_kstat_value(ksp, "c_max");
+
+ 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");
+
+ hits = get_kstat_value(ksp, "hits");
+ misses = get_kstat_value(ksp, "misses");
+
+ l2_size = get_kstat_value(ksp, "l2_size");
+ l2_read_bytes = get_kstat_value(ksp, "l2_read_bytes");
+ l2_write_bytes = get_kstat_value(ksp, "l2_write_bytes");
+ l2_hits = get_kstat_value(ksp, "l2_hits");
+ l2_misses = get_kstat_value(ksp, "l2_misses");
+
+
+ za_submit_size (arcsize, targetsize, minlimit, maxlimit);
+ za_submit_gauge ("arc_l2_size", "", l2_size);
+
+ za_submit_counts ("hits", demand_data_hits, demand_metadata_hits,
+ prefetch_data_hits, prefetch_metadata_hits);
+ za_submit_counts ("misses", demand_data_misses, demand_metadata_misses,
+ prefetch_data_misses, prefetch_metadata_misses);
+
+ za_submit_gauge ("arc_ratio", "L1", hits / (hits + misses));
+ za_submit_gauge ("arc_ratio", "L2", l2_hits / (l2_hits + l2_misses));
+
+ za_submit_bytes (l2_read_bytes, l2_write_bytes);
+
+ return (0);
+}
+
+static int za_init (void) /* {{{ */
+{
+ ksp = NULL;
+
+ /* 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);
+ }
+
+ return (0);
+} /* }}} int za_init */
+
+void module_register (void)
+{
+ plugin_register_init ("zfs_arc", za_init);
+ plugin_register_read ("zfs_arc", za_read);
+} /* void module_register */
+
+/* vmi: set sw=8 noexpandtab fdm=marker : */
projects / collectd.git / commitdiff