/**
* collectd - src/swap.c
- * Copyright (C) 2005 Florian octo Forster
+ * Copyright (C) 2005,2006 Florian octo Forster
*
* 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
* Florian octo Forster <octo at verplant.org>
**/
-#include "swap.h"
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
-#if COLLECT_SWAP
#define MODULE_NAME "swap"
-#ifdef KERNEL_SOLARIS
-#include <sys/swap.h>
-#endif /* KERNEL_SOLARIS */
+#if defined(KERNEL_LINUX) || defined(KERNEL_SOLARIS) || defined(HAVE_LIBSTATGRAB)
+# define SWAP_HAVE_READ 1
+#else
+# define SWAP_HAVE_READ 0
+#endif
-#include "plugin.h"
-#include "common.h"
+#if HAVE_SYS_SWAP_H
+# include <sys/swap.h>
+#endif
#undef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
/* 1099511627776 == 1TB ought to be enough for anyone ;) */
static char *ds_def[] =
{
- "DS:used:GAUGE:25:0:1099511627776",
- "DS:free:GAUGE:25:0:1099511627776",
- "DS:cached:GAUGE:25:0:1099511627776",
- "DS:resv:GAUGE:25:0:1099511627776",
+ "DS:used:GAUGE:"COLLECTD_HEARTBEAT":0:1099511627776",
+ "DS:free:GAUGE:"COLLECTD_HEARTBEAT":0:1099511627776",
+ "DS:cached:GAUGE:"COLLECTD_HEARTBEAT":0:1099511627776",
+ "DS:resv:GAUGE:"COLLECTD_HEARTBEAT":0:1099511627776",
NULL
};
static int ds_num = 4;
static kstat_t *ksp;
#endif /* KERNEL_SOLARIS */
-void module_init (void)
+static void swap_init (void)
{
#ifdef KERNEL_SOLARIS
/* getpagesize(3C) tells me this does not fail.. */
return;
}
-void module_write (char *host, char *inst, char *val)
+static void swap_write (char *host, char *inst, char *val)
{
rrd_update_file (host, swap_file, val, ds_def, ds_num);
}
-void module_submit (unsigned long long swap_used,
+#if SWAP_HAVE_READ
+static void swap_submit (unsigned long long swap_used,
unsigned long long swap_free,
unsigned long long swap_cached,
unsigned long long swap_resv)
{
char buffer[512];
- if (snprintf (buffer, 512, "N:%llu:%llu:%llu:%llu", swap_used,
- swap_free, swap_cached, swap_resv) >= 512)
+ if (snprintf (buffer, 512, "%u:%llu:%llu:%llu:%llu", (unsigned int) curtime,
+ swap_used, swap_free, swap_cached, swap_resv) >= 512)
return;
plugin_submit (MODULE_NAME, "-", buffer);
}
-void module_read (void)
+static void swap_read (void)
{
#ifdef KERNEL_LINUX
FILE *fh;
swap_used = swap_total - (swap_free + swap_cached);
- module_submit (swap_used, swap_free, swap_cached, -1LL);
+ swap_submit (swap_used, swap_free, swap_cached, -1LL);
/* #endif defined(KERNEL_LINUX) */
#elif defined(KERNEL_SOLARIS)
unsigned long long swap_alloc;
unsigned long long swap_resv;
unsigned long long swap_avail;
- /* unsigned long long swap_free; */
-
- long long availrmem;
- long long swapfs_minfree;
struct anoninfo ai;
if (swapctl (SC_AINFO, &ai) == -1)
return;
- availrmem = get_kstat_value (ksp, "availrmem");
- swapfs_minfree = get_kstat_value (ksp, "minfree");
-
- if ((availrmem < 0LL) || (swapfs_minfree < 0LL))
- return;
-
- /*
- * Calculations learned by reading
- * http://www.itworld.com/Comp/2377/UIR980701perf/
+ /*
+ * Calculations from:
+ * http://cvs.opensolaris.org/source/xref/on/usr/src/cmd/swap/swap.c
+ * Also see:
+ * http://www.itworld.com/Comp/2377/UIR980701perf/ (outdated?)
+ * /usr/include/vm/anon.h
*
- * swap_resv += ani_resv
- * swap_alloc += MAX(ani_resv, ani_max) - ani_free
- * swap_avail += MAX(ani_max - ani_resv, 0) + (availrmem - swapfs_minfree)
- * swap_free += ani_free + (availrmem - swapfs_minfree)
+ * In short, swap -s shows: allocated + reserved = used, available
*
- * To clear up the terminology a bit:
- * resv = reserved (but not neccessarily used)
- * alloc = used (neccessarily reserved)
- * avail = not reserved (neccessarily free)
- * free = not allocates (possibly reserved)
+ * However, Solaris does not allow to allocated/reserved more than the
+ * available swap (physical memory + disk swap), so the pedant may
+ * prefer: allocated + unallocated = reserved, available
+ *
+ * We map the above to: used + resv = n/a, free
+ *
+ * Does your brain hurt yet? - Christophe Kalt
+ *
+ * Oh, and in case you wonder,
+ * swap_alloc = pagesize * ( ai.ani_max - ai.ani_free );
+ * can suffer from a 32bit overflow.
*/
- swap_resv = pagesize * ai.ani_resv;
- swap_alloc = pagesize * (MAX(ai.ani_resv, ai.ani_max) - ai.ani_free);
- swap_avail = pagesize * (MAX(ai.ani_max - ai.ani_resv, 0) + (availrmem - swapfs_minfree));
- /* swap_free = pagesize * (ai.ani_free + (availrmem - swapfs_minfree)); */
-
- module_submit (swap_alloc, swap_avail, -1LL, swap_resv - swap_alloc);
+ swap_alloc = ai.ani_max - ai.ani_free;
+ swap_alloc *= pagesize;
+ swap_resv = ai.ani_resv + ai.ani_free - ai.ani_max;
+ swap_resv *= pagesize;
+ swap_avail = ai.ani_max - ai.ani_resv;
+ swap_avail *= pagesize;
+
+ swap_submit (swap_alloc, swap_avail, -1LL, swap_resv);
/* #endif defined(KERNEL_SOLARIS) */
#elif defined(HAVE_LIBSTATGRAB)
sg_swap_stats *swap;
if ((swap = sg_get_swap_stats ()) != NULL)
- module_submit (swap->used, swap->free, -1LL, -1LL);
+ swap_submit (swap->used, swap->free, -1LL, -1LL);
#endif /* HAVE_LIBSTATGRAB */
}
+#else
+# define swap_read NULL
+#endif /* SWAP_HAVE_READ */
void module_register (void)
{
- plugin_register (MODULE_NAME, module_init, module_read, module_write);
+ plugin_register (MODULE_NAME, swap_init, swap_read, swap_write);
}
#undef MODULE_NAME
-#endif /* COLLECT_SWAP */