* collectd - src/zfs_arc.c
* Copyright (C) 2009 Anthony Dewhurst
* Copyright (C) 2012 Aurelien Rougemont
+ * Copyright (C) 2013 Xin Li
+ * Copyright (C) 2014 Marc Fournier
+ * Copyright (C) 2014 Wilfried Goesgens
*
* 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>
+ * Marc Fournier <marc.fournier at camptocamp.com>
+ * Wilfried Goesgens <dothebart at citadel.org>
**/
#include "collectd.h"
* Global variables
*/
-#if !defined(__FreeBSD__)
+#if defined(KERNEL_LINUX)
+#include "utils_llist.h"
+#define ZOL_ARCSTATS_FILE "/proc/spl/kstat/zfs/arcstats"
+
+typedef llist_t kstat_t;
+
+static int put_zfs_value (kstat_t *ksp, char const *k, value_t v)
+{
+ llentry_t *e;
+ char *k_copy;
+ value_t *v_copy;
+
+ k_copy = strdup (k);
+ if (k_copy == NULL)
+ return ENOMEM;
+
+ v_copy = malloc (sizeof (*v_copy));
+ if (v_copy == NULL)
+ {
+ sfree (k_copy);
+ return ENOMEM;
+ }
+ *v_copy = v;
+
+ e = llentry_create (k_copy, v_copy);
+ if (e == NULL)
+ {
+ sfree (v_copy);
+ sfree (k_copy);
+ return ENOMEM;
+ }
+
+ llist_append (ksp, e);
+ return 0;
+}
+
+static long long get_zfs_value(kstat_t *ksp, char *key)
+{
+ llentry_t *e;
+ value_t *v;
+
+ e = llist_search (ksp, key);
+ if (e == NULL)
+ {
+ ERROR ("zfs_arc plugin: `llist_search` failed for key: '%s'.", key);
+ return (-1);
+ }
+
+ v = e->value;
+ return ((long long) v->derive);
+}
+
+static void free_zfs_values (kstat_t *ksp)
+{
+ llentry_t *e;
+
+ if (ksp == NULL)
+ return;
+
+ for (e = llist_head (ksp); e != NULL; e = e->next)
+ {
+ sfree (e->key);
+ sfree (e->value);
+ }
+
+ llist_destroy (ksp);
+}
+
+#elif !defined(__FreeBSD__) // Solaris
extern kstat_ctl_t *kc;
static long long get_zfs_value(kstat_t *ksp, char *name)
return (get_kstat_value(ksp, name));
}
-#else
+#else // FreeBSD
#include <sys/types.h>
#include <sys/sysctl.h>
typedef void kstat_t;
#endif
-static long long get_zfs_value(void * dummy __unused, const char *kstat_value)
+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;
- char *key;
-
- key = ssnprintf_alloc("%s%s", zfs_arcstat, kstat_value);
- if (key != NULL) {
- if (strlen(key) > 0) {
- rv = sysctlbyname(key, (void *)&value, &valuelen, NULL, (size_t)0);
- free(key);
- if (rv == 0)
- return (value);
- } else
- free(key);
- }
+
+ 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);
}
tmp = get_zfs_value (ksp, (char *)kstat_value);
if (tmp == -1LL)
{
- ERROR ("zfs_arc plugin: Reading kstat value \"%s\" failed.", kstat_value);
+ WARNING ("zfs_arc plugin: Reading kstat value \"%s\" failed.", kstat_value);
return (-1);
}
tmp = get_zfs_value (ksp, (char *)kstat_value);
if (tmp == -1LL)
{
- ERROR ("zfs_arc plugin: Reading kstat value \"%s\" failed.", kstat_value);
+ WARNING ("zfs_arc plugin: Reading kstat value \"%s\" failed.", kstat_value);
return (-1);
}
value_t l2_io[2];
kstat_t *ksp = NULL;
-#if !defined(__FreeBSD__)
+#if KERNEL_LINUX
+ FILE *fh;
+ char buffer[1024];
+
+ fh = fopen (ZOL_ARCSTATS_FILE, "r");
+ if (fh == NULL)
+ {
+ char errbuf[1024];
+ ERROR ("zfs_arc plugin: Opening \"%s\" failed: %s", ZOL_ARCSTATS_FILE,
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ return (-1);
+ }
+
+ ksp = llist_create ();
+ if (ksp == NULL)
+ {
+ ERROR ("zfs_arc plugin: `llist_create' failed.");
+ fclose (fh);
+ return (-1);
+ }
+
+ while (fgets (buffer, sizeof (buffer), fh) != NULL)
+ {
+ char *fields[3];
+ value_t v;
+ int status;
+
+ status = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
+ if (status != 3)
+ continue;
+
+ status = parse_value (fields[2], &v, DS_TYPE_DERIVE);
+ if (status != 0)
+ continue;
+
+ put_zfs_value (ksp, fields[0], v);
+ }
+
+ fclose (fh);
+
+#elif !defined(__FreeBSD__) // Solaris
get_kstat (&ksp, "zfs", 0, "arcstats");
if (ksp == NULL)
{
/* Sizes */
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_gauge (ksp, "c", "cache_size", "c");
+ za_read_gauge (ksp, "c_min", "cache_size", "c_min");
+ za_read_gauge (ksp, "c_max", "cache_size", "c_max");
+
+ /* The "l2_size" value has disappeared from Solaris some time in
+ * early 2013, and has only reappeared recently in Solaris 11.2.
+ * Stop trying if we ever fail to read it, so we don't spam the log.
+ */
+ static int l2_size_avail = 1;
+ if (l2_size_avail && za_read_gauge (ksp, "l2_size", "cache_size", "L2") != 0)
+ l2_size_avail = 0;
+
+ /* Operations */
za_read_derive (ksp, "deleted", "cache_operation", "deleted");
+#if __FreeBSD__
+ za_read_derive (ksp, "allocated","cache_operation", "allocated");
za_read_derive (ksp, "stolen", "cache_operation", "stolen");
+#endif
- /* Issue indicators */
- za_read_derive (ksp, "mutex_miss", "mutex_operations", "miss");
+ /* Issue indicators */
+ za_read_derive (ksp, "mutex_miss", "mutex_operations", "miss");
za_read_derive (ksp, "hash_collisions", "hash_collisions", "");
-
- /* Evictions */
+
+ /* 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");
za_submit ("io_octets", "L2", l2_io, /* num values = */ 2);
+#if defined(KERNEL_LINUX)
+ free_zfs_values (ksp);
+#endif
+
return (0);
} /* int za_read */
static int za_init (void) /* {{{ */
{
-#if !defined(__FreeBSD__)
+#if !defined(__FreeBSD__) && !defined(KERNEL_LINUX) // Solaris
/* kstats chain already opened by update_kstat (using *kc), verify everything went fine. */
if (kc == NULL)
{
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