#define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
#define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */
-#define VIRTIO_BALLOON_S_NR 7
+#define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
+#define VIRTIO_BALLOON_S_NR 8
/*
* Memory statistics structure.