[PATCH 1/1] balloon: introduce 6 memory statistics

Expose more memory statistics of the virtual memory subsystem from
guest, it's helpful to analyze the memory performance and pressure
from host side.

Signed-off-by: zhenwei pi <[email protected]>
---
 device-types/balloon/description.tex | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/device-types/balloon/description.tex b/device-types/balloon/description.tex
index a1d9603..bc8e109 100644
--- a/device-types/balloon/description.tex
+++ b/device-types/balloon/description.tex
@@ -305,6 +305,12 @@ \subsubsection{Memory Statistics}\label{sec:Device Types / Memory Balloon Device
 #define VIRTIO_BALLOON_S_CACHES   7
 #define VIRTIO_BALLOON_S_HTLB_PGALLOC 8
 #define VIRTIO_BALLOON_S_HTLB_PGFAIL  9
+#define VIRTIO_BALLOON_S_OOM_KILL       10
+#define VIRTIO_BALLOON_S_ALLOC_STALL    11
+#define VIRTIO_BALLOON_S_ASYNC_SCAN     12
+#define VIRTIO_BALLOON_S_DIRECT_SCAN    13
+#define VIRTIO_BALLOON_S_ASYNC_RECLAIM  14
+#define VIRTIO_BALLOON_S_DIRECT_RECLAIM 15
         le16 tag;
         le64 val;
 } __attribute__((packed));
@@ -399,6 +405,24 @@ \subsubsection{Memory Statistics Tags}\label{sec:Device Types / Memory Balloon D
 
 \item[VIRTIO_BALLOON_S_HTLB_PGFAIL (9)] The number of failed hugetlb page
   allocations in the guest.
+
+\item[VIRTIO_BALLOON_S_OOM_KILL (10)] The number of Out-Of-Memory killer
+  invocations.
+
+\item[VIRTIO_BALLOON_S_ALLOC_STALL (11)] The number of stall count on memory
+  allocation.
+
+\item[VIRTIO_BALLOON_S_ASYNC_SCAN (12)] The amount of memory that has been
+  scanned asynchronously (in bytes).
+
+\item[VIRTIO_BALLOON_S_DIRECT_SCAN (13)] The amount of memory that has been
+  scanned directly (in bytes).
+
+\item[VIRTIO_BALLOON_S_ASYNC_RECLAIM (14)] The amount of memory that has been
+  reclaimed asynchronously (in bytes).
+
+\item[VIRTIO_BALLOON_S_DIRECT_RECLAIM (15)] The amount of memory that has been
+  reclaimed directly (in bytes).
 \end{description}
 
 \subsubsection{Free Page Hinting}\label{sec:Device Types / Memory Balloon Device / Device Operation / Free Page Hinting}
-- 
2.34.1