#if HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
#endif
+#if HAVE_KVM_H
+# include <kvm.h>
+#endif
#define MODULE_NAME "swap"
-#if KERNEL_LINUX || HAVE_LIBKSTAT || HAVE_SYS_SYSCTL_H || HAVE_LIBSTATGRAB
+#if KERNEL_LINUX || HAVE_LIBKSTAT || defined(VM_SWAPUSAGE) || HAVE_LIBKVM || HAVE_LIBSTATGRAB
# define SWAP_HAVE_READ 1
#else
# define SWAP_HAVE_READ 0
/* #endif KERNEL_LINUX */
#elif HAVE_LIBKSTAT
-static int pagesize;
+static unsigned long long pagesize;
static kstat_t *ksp;
/* #endif HAVE_LIBKSTAT */
-#elif HAVE_SYS_SYSCTL_H
+#elif defined(VM_SWAPUSAGE)
/* No global variables */
-/* #endif HAVE_SYS_SYSCTL_H */
+/* #endif defined(VM_SWAPUSAGE) */
+
+#elif HAVE_LIBKVM
+static kvm_t *kvm_obj = NULL;
+int kvm_pagesize;
+/* #endif HAVE_LIBKVM */
#elif HAVE_LIBSTATGRAB
/* No global variables */
#elif HAVE_LIBKSTAT
/* getpagesize(3C) tells me this does not fail.. */
- pagesize = getpagesize ();
+ pagesize = (unsigned long long) getpagesize ();
if (get_kstat (&ksp, "unix", 0, "system_pages"))
ksp = NULL;
/* #endif HAVE_LIBKSTAT */
-#elif HAVE_SYS_SYSCTL_H
+#elif defined(VM_SWAPUSAGE)
/* No init stuff */
-/* #endif HAVE_SYS_SYSCTL_H */
+/* #endif defined(VM_SWAPUSAGE) */
+
+#elif HAVE_LIBKVM
+ if (kvm_obj != NULL)
+ {
+ kvm_close (kvm_obj);
+ kvm_obj = NULL;
+ }
+
+ kvm_pagesize = getpagesize ();
+
+ if ((kvm_obj = kvm_open (NULL, /* execfile */
+ NULL, /* corefile */
+ NULL, /* swapfile */
+ O_RDONLY, /* flags */
+ NULL)) /* errstr */
+ == NULL)
+ {
+ syslog (LOG_ERR, "swap plugin: kvm_open failed.");
+ return;
+ }
+/* #endif HAVE_LIBKVM */
#elif HAVE_LIBSTATGRAB
/* No init stuff */
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)
+ {
+ syslog (LOG_ERR, "swap plugin: swapctl failed: %s",
+ strerror (errno));
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+ * http://www.itworld.com/Comp/2377/UIR980701perf/ (outdated?)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
+ *
+ * In short, swap -s shows: allocated + reserved = used, available
*
- * 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)
+ * 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
*
- * 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)
+ * 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)); */
+ 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 - swap_alloc);
/* #endif HAVE_LIBKSTAT */
-#elif HAVE_SYS_SYSCTL_H
+#elif defined(VM_SWAPUSAGE)
int mib[3];
size_t mib_len;
struct xsw_usage sw_usage;
size_t sw_usage_len;
- int status;
-#if defined(VM_SWAPUSAGE)
mib_len = 2;
mib[0] = CTL_VM;
mib[1] = VM_SWAPUSAGE;
-#else
- mib_len = 3;
- if ((status = sysctlnametomib ("vm.swap_info", mib, &mib_len)) < 0)
- {
- syslog (LOG_WARN, "swap plugin: sysctlnametomib failed: %s",
- strerror (errno));
- return;
- }
-#endif
sw_usage_len = sizeof (struct xsw_usage);
/* The returned values are bytes. */
swap_submit (sw_usage.xsu_used, sw_usage.xsu_avail, -1LL, -1LL);
-/* #endif HAVE_SYS_SYSCTL_H */
+/* #endif VM_SWAPUSAGE */
+
+#elif HAVE_LIBKVM
+ struct kvm_swap data_s;
+ int status;
+
+ unsigned long long used;
+ unsigned long long free;
+ unsigned long long total;
+
+ if (kvm_obj == NULL)
+ return;
+
+ /* only one structure => only get the grand total, no details */
+ status = kvm_getswapinfo (kvm_obj, &data_s, 1, 0);
+ if (status == -1)
+ return;
+
+ total = (unsigned long long) data_s.ksw_total;
+ used = (unsigned long long) data_s.ksw_used;
+
+ total *= (unsigned long long) kvm_pagesize;
+ used *= (unsigned long long) kvm_pagesize;
+
+ free = total - used;
+
+ swap_submit (used, free, -1LL, -1LL);
+/* #endif HAVE_LIBKVM */
#elif HAVE_LIBSTATGRAB
sg_swap_stats *swap;
projects / collectd.git / blobdiff