memory_bsd: add user_wired_bytes & laundry_bytes

These two memory classes have been here for a while now in FreeBSD,
adding them allows having information for all memory classes.

Signed-off-by: François Charlier <fcharlier@ploup.net>

collector/memory_bsd.go

@@ -82,6 +82,12 @@ func NewMemoryCollector(logger log.Logger) (Collector, error) {
 				mib:         "vm.stats.vm.v_wire_count",
 				conversion:  fromPage,
 			},
+			{
+				name:        "user_wired_bytes",
+				description: "Locked in memory by user, mlock, etc",
+				mib:         "vm.stats.vm.v_user_wire_count",
+				conversion:  fromPage,
+			},
 			{
 				name:        "cache_bytes",
 				description: "Almost free, backed by swap or files, available for re-allocation",
@@ -100,6 +106,12 @@ func NewMemoryCollector(logger log.Logger) (Collector, error) {
 				mib:         "vm.stats.vm.v_free_count",
 				conversion:  fromPage,
 			},
+			{
+				name:        "laundry_bytes",
+				description: "Dirty not recently used by userland",
+				mib:         "vm.stats.vm.v_laundry_count",
+				conversion:  fromPage,
+			},
 			{
 				name:        "size_bytes",
 				description: "Total physical memory size",