[PATCH] content: document balloon memory statistics

[Tomáš Golembiovský <tgolembi@redhat.com>]

Linux kernel provides some balloon memory statistics that were not
included in the specs. Include them to avoid any ID clashes in the
future.

Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>
---
 content.tex | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/content.tex b/content.tex
index c7ef7fd..74d351c 100644
--- a/content.tex
+++ b/content.tex
@@ -5028,6 +5028,8 @@ struct virtio_balloon_stat {
 #define VIRTIO_BALLOON_S_MINFLT   3
 #define VIRTIO_BALLOON_S_MEMFREE  4
 #define VIRTIO_BALLOON_S_MEMTOT   5
+#define VIRTIO_BALLOON_S_AVAIL    6
+#define VIRTIO_BALLOON_S_CACHES   7
         le16 tag;
         le64 val;
 } __attribute__((packed));
@@ -5109,6 +5111,12 @@ first buffer.
 
 \item[VIRTIO_BALLOON_S_MEMTOT (5)] The total amount of memory available
   (in bytes).
+
+\item[VIRTIO_BALLOON_S_AVAIL (6)] An estimate of how much memory is available
+  (in bytes) for starting new applications, without pushing the system to swap.
+
+\item[VIRTIO_BALLOON_S_CACHES (7)] The amount of memory currently used for
+  caching files and other data from disk (in bytes).
 \end{description}
 
 \section{SCSI Host Device}\label{sec:Device Types / SCSI Host Device}
-- 
2.16.1