[PATCH v7 3/6] add interface virCgroupGetMemSwapUsage

[Gao feng <gaofeng@xxxxxxxxxxxxxx>]

virCgroupGetMemSwapUsage is used to get container's swap usage,
with this interface,we can get swap usage in fuse filesystem.

Signed-off-by: Gao feng <gaofeng@xxxxxxxxxxxxxx>
---
 src/libvirt_private.syms |    1 +
 src/util/cgroup.c        |   20 ++++++++++++++++++++
 src/util/cgroup.h        |    1 +
 3 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index e94b478..2608072 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -98,6 +98,7 @@ virCgroupGetCpuacctUsage;
 virCgroupGetCpusetCpus;
 virCgroupGetCpusetMems;
 virCgroupGetFreezerState;
+virCgroupGetMemSwapUsage;
 virCgroupGetMemSwapHardLimit;
 virCgroupGetMemoryHardLimit;
 virCgroupGetMemorySoftLimit;
diff --git a/src/util/cgroup.c b/src/util/cgroup.c
index 3f7b5f7..4aae70d 100644
--- a/src/util/cgroup.c
+++ b/src/util/cgroup.c
@@ -1371,6 +1371,26 @@ int virCgroupGetMemSwapHardLimit(virCgroupPtr group, unsigned long long *kb)
 }
 
 /**
+ * virCgroupGetMemSwapUsage:
+ *
+ * @group: The cgroup to get mem+swap usage for
+ * @kb: The mem+swap amount in kilobytes
+ *
+ * Returns: 0 on success
+ */
+int virCgroupGetMemSwapUsage(virCgroupPtr group, unsigned long long *kb)
+{
+    long long unsigned int usage_in_bytes;
+    int ret;
+    ret = virCgroupGetValueU64(group,
+                               VIR_CGROUP_CONTROLLER_MEMORY,
+                               "memory.memsw.usage_in_bytes", &usage_in_bytes);
+    if (ret == 0)
+        *kb = usage_in_bytes >> 10;
+    return ret;
+}
+
+/**
  * virCgroupSetCpusetMems:
  *
  * @group: The cgroup to set cpuset.mems for
diff --git a/src/util/cgroup.h b/src/util/cgroup.h
index 38fa4b7..0c11eb1 100644
--- a/src/util/cgroup.h
+++ b/src/util/cgroup.h
@@ -92,6 +92,7 @@ int virCgroupSetMemorySoftLimit(virCgroupPtr group, unsigned long long kb);
 int virCgroupGetMemorySoftLimit(virCgroupPtr group, unsigned long long *kb);
 int virCgroupSetMemSwapHardLimit(virCgroupPtr group, unsigned long long kb);
 int virCgroupGetMemSwapHardLimit(virCgroupPtr group, unsigned long long *kb);
+int virCgroupGetMemSwapUsage(virCgroupPtr group, unsigned long long *kb);
 
 enum {
     VIR_CGROUP_DEVICE_READ  = 1,
-- 
1.7.7.6

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