Add compact metrics to vmstat (#754)

Signed-off-by: Charles <[email protected]>

Author: cbensimon

sysfs/vmstat_numa.go

@@ -86,6 +86,9 @@ type VMStat struct {
 	NrKernelMiscReclaimable    uint64
 	NrFollPinAcquired          uint64
 	NrFollPinReleased          uint64
+	CompactStall               uint64
+	CompactFail                uint64
+	CompactSuccess             uint64
 }
 
 func (fs FS) VMStatNUMA() (map[int]VMStat, error) {
@@ -242,6 +245,12 @@ func parseVMStatNUMA(r []byte) (VMStat, error) {
 			vmStat.NrFollPinAcquired = fv
 		case "nr_foll_pin_released":
 			vmStat.NrFollPinReleased = fv
+		case "compact_stall":
+			vmStat.CompactStall = fv
+		case "compact_fail":
+			vmStat.CompactFail = fv
+		case "compact_success":
+			vmStat.CompactSuccess = fv
 		}
 
 	}