tests: Augment vcgrouptest to add virCgroupGetMemoryStat

Add a test to fetch the GetMemoryStat output. This only gets
data for v1 only right now since the v2 data from commit 61ff6021
is rather useless returning all 0's. The v1 data was originally
added in commit d1452470.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

tests/vircgrouptest.c

@@ -802,6 +802,67 @@ static int testCgroupGetMemoryUsage(const void *args ATTRIBUTE_UNUSED)
     return ret;
 }
 
+
+static int
+testCgroupGetMemoryStat(const void *args ATTRIBUTE_UNUSED)
+{
+    virCgroupPtr cgroup = NULL;
+    int rv;
+    int ret = -1;
+    size_t i;
+
+    const unsigned long long expected_values[] = {
+        1336619008ULL,
+        67100672ULL,
+        145887232ULL,
+        661872640ULL,
+        627400704UL,
+        3690496ULL
+    };
+    const char* names[] = {
+        "cache",
+        "active_anon",
+        "inactive_anon",
+        "active_file",
+        "inactive_file",
+        "unevictable"
+    };
+    unsigned long long values[ARRAY_CARDINALITY(expected_values)];
+
+    if ((rv = virCgroupNewPartition("/virtualmachines", true,
+                                    (1 << VIR_CGROUP_CONTROLLER_MEMORY),
+                                    &cgroup)) < 0) {
+        fprintf(stderr, "Could not create /virtualmachines cgroup: %d\n", -rv);
+        goto cleanup;
+    }
+
+    if ((rv = virCgroupGetMemoryStat(cgroup, &values[0],
+                                     &values[1], &values[2],
+                                     &values[3], &values[4],
+                                     &values[5])) < 0) {
+        fprintf(stderr, "Could not retrieve GetMemoryStat for /virtualmachines cgroup: %d\n", -rv);
+        goto cleanup;
+    }
+
+    for (i = 0; i < ARRAY_CARDINALITY(expected_values); i++) {
+        /* NB: virCgroupGetMemoryStat returns a KiB scaled value */
+        if ((expected_values[i] >> 10) != values[i]) {
+            fprintf(stderr,
+                    "Wrong value (%llu) for %s from virCgroupGetMemoryStat "
+                    "(expected %llu)\n",
+                    values[i], names[i], (expected_values[i] >> 10));
+            goto cleanup;
+        }
+    }
+
+    ret = 0;
+
+ cleanup:
+    virCgroupFree(&cgroup);
+    return ret;
+}
+
+
 static int testCgroupGetBlkioIoServiced(const void *args ATTRIBUTE_UNUSED)
 {
     virCgroupPtr cgroup = NULL;
@@ -1035,6 +1096,9 @@ mymain(void)
     if (virTestRun("virCgroupGetMemoryUsage works", testCgroupGetMemoryUsage, NULL) < 0)
         ret = -1;
 
+    if (virTestRun("virCgroupGetMemoryStat works", testCgroupGetMemoryStat, NULL) < 0)
+        ret = -1;
+
     if (virTestRun("virCgroupGetPercpuStats works", testCgroupGetPercpuStats, NULL) < 0)
         ret = -1;
     cleanupFakeFS(fakerootdir);