[PATCH] qemu: add entry for balloon stat stat-disk-caches

[Tomáš Golembiovský <tgolembi@xxxxxxxxxx>]

Signed-off-by: Tomáš Golembiovský <tgolembi@xxxxxxxxxx>
---
 include/libvirt/libvirt-domain.h | 9 ++++++++-
 src/qemu/qemu_monitor_json.c     | 2 ++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index da773b76cb..b96c018a90 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -628,11 +628,18 @@ typedef enum {
     /* Timestamp of the last update of statistics, in seconds. */
     VIR_DOMAIN_MEMORY_STAT_LAST_UPDATE     = 9,
 
+    /*
+     * The amount of memory, in bytes, that can be quickly reclaimed without
+     * additional I/O. Typically these pages are used for caching files from
+     * disk.
+     */
+    VIR_DOMAIN_MEMORY_STAT_DISK_CACHES     = 10,
+
     /*
      * The number of statistics supported by this version of the interface.
      * To add new statistics, add them to the enum and increase this value.
      */
-    VIR_DOMAIN_MEMORY_STAT_NR              = 10,
+    VIR_DOMAIN_MEMORY_STAT_NR              = 11,
 
 # ifdef VIR_ENUM_SENTINELS
     VIR_DOMAIN_MEMORY_STAT_LAST = VIR_DOMAIN_MEMORY_STAT_NR
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 42d7b9c5e9..b0a65d8af9 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -2069,6 +2069,8 @@ int qemuMonitorJSONGetMemoryStats(qemuMonitorPtr mon,
                       VIR_DOMAIN_MEMORY_STAT_AVAILABLE, 1024);
     GET_BALLOON_STATS(statsdata, "stat-available-memory",
                       VIR_DOMAIN_MEMORY_STAT_USABLE, 1024);
+    GET_BALLOON_STATS(statsdata, "stat-disk-caches",
+                      VIR_DOMAIN_MEMORY_STAT_DISK_CACHES, 1024);
     GET_BALLOON_STATS(data, "last-update",
                       VIR_DOMAIN_MEMORY_STAT_LAST_UPDATE, 1);
     ret = got;
-- 
2.17.0

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