Qemu once supported following memory stats which will returned by
"query_balloon":
stat_put(dict, "actual", actual);
stat_put(dict, "mem_swapped_in", dev->stats[VIRTIO_BALLOON_S_SWAP_IN]);
stat_put(dict, "mem_swapped_out", dev->stats[VIRTIO_BALLOON_S_SWAP_OUT]);
stat_put(dict, "major_page_faults", dev->stats[VIRTIO_BALLOON_S_MAJFLT]);
stat_put(dict, "minor_page_faults", dev->stats[VIRTIO_BALLOON_S_MINFLT]);
stat_put(dict, "free_mem", dev->stats[VIRTIO_BALLOON_S_MEMFREE]);
stat_put(dict, "total_mem", dev->stats[VIRTIO_BALLOON_S_MEMTOT]);
But it later disabled all the stats except "actual" by commit
07b0403dfc2b2ac179ae5b48105096cc2d03375a.
libvirt doesn't parse "actual", so user will always see a empty result
with "virsh dommemstat $domain". Even qemu haven't disabled the stats,
we should support parsing "actual".
---
include/libvirt/libvirt.h.in | 4 +++-
src/libvirt.c | 2 ++
src/qemu/qemu_monitor_json.c | 12 ++++++++++++
tools/virsh.c | 2 ++
4 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index 8058229..864852b 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -456,11 +456,13 @@ typedef enum {
*/
VIR_DOMAIN_MEMORY_STAT_AVAILABLE = 5,
+ /* Current balloon value (in KB). */
+ VIR_DOMAIN_MEMORY_STAT_ACTUAL = 6,
/*
* 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 = 6,
+ VIR_DOMAIN_MEMORY_STAT_NR = 7,
} virDomainMemoryStatTags;
typedef struct _virDomainMemoryStat virDomainMemoryStatStruct;
diff --git a/src/libvirt.c b/src/libvirt.c
index eaae0ec..c635ff5 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -5802,6 +5802,8 @@ error:
* The amount of memory which is not being used for any purpose (in kb).
* VIR_DOMAIN_MEMORY_STAT_AVAILABLE:
* The total amount of memory available to the domain's OS (in kb).
+ * VIR_DOMAIN_MEMORY_STAT_ACTUAL:
+ * Current balloon value (in kb).
*
* Returns: The number of stats provided or -1 in case of failure.
*/
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 75adf66..9f16403 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -1119,6 +1119,18 @@ int qemuMonitorJSONGetMemoryStats(qemuMonitorPtr mon,
goto cleanup;
}
+ if (virJSONValueObjectHasKey(data, "actual") && (got < nr_stats)) {
+ if (virJSONValueObjectGetNumberUlong(data, "actual", &mem) < 0) {
+ qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("info balloon reply was missing balloon actual"));
+ ret = -1;
+ goto cleanup;
+ }
+ stats[got].tag = VIR_DOMAIN_MEMORY_STAT_ACTUAL;
+ stats[got].val = (mem/1024);
+ got++;
+ }
+
if (virJSONValueObjectHasKey(data, "mem_swapped_in") && (got < nr_stats)) {
if (virJSONValueObjectGetNumberUlong(data, "mem_swapped_in", &mem) < 0) {
qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
diff --git a/tools/virsh.c b/tools/virsh.c
index 5679a2d..a358b73 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -1147,6 +1147,8 @@ cmdDomMemStat(vshControl *ctl, const vshCmd *cmd)
vshPrint (ctl, "unused %llu\n", stats[i].val);
if (stats[i].tag == VIR_DOMAIN_MEMORY_STAT_AVAILABLE)
vshPrint (ctl, "available %llu\n", stats[i].val);
+ if (stats[i].tag == VIR_DOMAIN_MEMORY_STAT_ACTUAL)
+ vshPrint (ctl, "actual %llu\n", stats[i].val);
}
virDomainFree(dom);
--
1.7.4
--
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