[libvirt] [PATCH 16/17] vircgroup: Introduce virCgroupGetMemoryStat

[Pavel Hrdina]

Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
 src/libvirt_private.syms |  1 +
 src/util/vircgroup.c     | 88 ++++++++++++++++++++++++++++++++++++++++
 src/util/vircgroup.h     |  7 ++++
 3 files changed, 96 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 59d9bc380e..ee0dca6129 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1532,6 +1532,7 @@ virCgroupGetDomainTotalCpuStats;
 virCgroupGetFreezerState;
 virCgroupGetMemoryHardLimit;
 virCgroupGetMemorySoftLimit;
+virCgroupGetMemoryStat;
 virCgroupGetMemoryUsage;
 virCgroupGetMemSwapHardLimit;
 virCgroupGetMemSwapUsage;
diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 37982a9607..b91acd13c7 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -2427,6 +2427,94 @@ virCgroupSetMemory(virCgroupPtr group, unsigned long long kb)
 }
 
 
+/**
+ * virCgroupGetMemoryStat:
+ *
+ * @group: The cgroup to change memory for
+ * @cache: page cache memory in KiB
+ * @activeAnon: anonymous and swap cache memory in KiB
+ * @inactiveAnon: anonymous and swap cache memory in KiB
+ * @activeFile: file-backed memory in KiB
+ * @inactiveFile: file-backed memory in KiB
+ * @unevictable: memory that cannot be reclaimed KiB
+ *
+ * Returns: 0 on success, -1 on error
+ */
+int
+virCgroupGetMemoryStat(virCgroupPtr group,
+                       unsigned long long *cache,
+                       unsigned long long *activeAnon,
+                       unsigned long long *inactiveAnon,
+                       unsigned long long *activeFile,
+                       unsigned long long *inactiveFile,
+                       unsigned long long *unevictable)
+{
+    int ret = -1;
+    char *stat = NULL;
+    char *line = NULL;
+    unsigned long long cacheVal = 0;
+    unsigned long long activeAnonVal = 0;
+    unsigned long long inactiveAnonVal = 0;
+    unsigned long long activeFileVal = 0;
+    unsigned long long inactiveFileVal = 0;
+    unsigned long long unevictableVal = 0;
+
+    if (virCgroupGetValueStr(group,
+                             VIR_CGROUP_CONTROLLER_MEMORY,
+                             "memory.stat",
+                             &stat) < 0) {
+        return -1;
+    }
+
+    line = stat;
+
+    while (line) {
+        char *newLine = strchr(line, '\n');
+        char *valueStr = strchr(line, ' ');
+        unsigned long long value;
+
+        if (newLine)
+            *newLine = '\0';
+
+        if (!valueStr) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("Cannot parse 'memory.stat' cgroup file."));
+            goto cleanup;
+        }
+        *valueStr = '\0';
+
+        if (virStrToLong_ull(valueStr + 1, NULL, 10, &value) < 0)
+            goto cleanup;
+
+        if (STREQ(line, "cache"))
+            cacheVal = value >> 10;
+        else if (STREQ(line, "active_anon"))
+            activeAnonVal = value >> 10;
+        else if (STREQ(line, "inactive_anon"))
+            inactiveAnonVal = value >> 10;
+        else if (STREQ(line, "active_file"))
+            activeFileVal = value >> 10;
+        else if (STREQ(line, "inactive_file"))
+            inactiveFileVal = value >> 10;
+        else if (STREQ(line, "unevictable"))
+            unevictableVal = value >> 10;
+    }
+
+    *cache = cacheVal;
+    *activeAnon = activeAnonVal;
+    *inactiveAnon = inactiveAnonVal;
+    *activeFile = activeFileVal;
+    *inactiveFile = inactiveFileVal;
+    *unevictable = unevictableVal;
+
+    ret = 0;
+
+ cleanup:
+    VIR_FREE(stat);
+    return ret;
+}
+
+
 /**
  * virCgroupGetMemoryUsage:
  *
diff --git a/src/util/vircgroup.h b/src/util/vircgroup.h
index 48be077aba..c7fdaaede4 100644
--- a/src/util/vircgroup.h
+++ b/src/util/vircgroup.h
@@ -177,6 +177,13 @@ int virCgroupGetBlkioDeviceWriteBps(virCgroupPtr group,
                                     unsigned long long *wbps);
 
 int virCgroupSetMemory(virCgroupPtr group, unsigned long long kb);
+int virCgroupGetMemoryStat(virCgroupPtr group,
+                           unsigned long long *cache,
+                           unsigned long long *activeAnon,
+                           unsigned long long *inactiveAnon,
+                           unsigned long long *activeFile,
+                           unsigned long long *inactiveFile,
+                           unsigned long long *unevictable);
 int virCgroupGetMemoryUsage(virCgroupPtr group, unsigned long *kb);
 
 int virCgroupSetMemoryHardLimit(virCgroupPtr group, unsigned long long kb);
-- 
2.17.1