diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index a4e8ca9212532c9e594b20de450dd6361aced71b..149055892f53c354ede68d2915c67fe60131f2ab 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -4490,6 +4490,18 @@ typedef virMemoryParameter *virMemoryParameterPtr;
  */
 # define VIR_NODE_MEMORY_SHARED_FULL_SCANS         "shm_full_scans"
 
+/* VIR_NODE_MEMORY_SHARED_MERGE_ACROSS_NODES:
+ *
+ * Macro for typed parameter that represents whether pages from
+ * different NUMA nodes can be merged. The parameter has type int,
+ * when its value is 0, only pages which physically reside in the
+ * memory area of same NUMA node are merged; When its value is 1,
+ * pages from all nodes can be merged. Other values are reserved
+ * for future use.
+ */
+# define VIR_NODE_MEMORY_SHARED_MERGE_ACROSS_NODES "shm_merge_across_nodes"
+
+
 int virNodeGetMemoryParameters(virConnectPtr conn,
                                virTypedParameterPtr params,
                                int *nparams,
diff --git a/src/nodeinfo.c b/src/nodeinfo.c
index c0e60d8099ef5bf89fcf4b5c48dc4916fbf829ab..8f96b8b2f664274c10f7266d5d6c8cbe138e5cbb 100644
--- a/src/nodeinfo.c
+++ b/src/nodeinfo.c
@@ -1005,6 +1005,8 @@ nodeSetMemoryParameters(virConnectPtr conn ATTRIBUTE_UNUSED,
                                        VIR_TYPED_PARAM_UINT,
                                        VIR_NODE_MEMORY_SHARED_SLEEP_MILLISECS,
                                        VIR_TYPED_PARAM_UINT,
+                                       VIR_NODE_MEMORY_SHARED_MERGE_ACROSS_NODES,
+                                       VIR_TYPED_PARAM_UINT,
                                        NULL) < 0)
         return -1;
 
@@ -1022,6 +1024,13 @@ nodeSetMemoryParameters(virConnectPtr conn ATTRIBUTE_UNUSED,
                          VIR_NODE_MEMORY_SHARED_SLEEP_MILLISECS)) {
             ret = nodeSetMemoryParameterValue("sleep_millisecs", param);
 
+            /* Out of memory */
+            if (ret == -2)
+                return -1;
+        } else if (STREQ(param->field,
+                         VIR_NODE_MEMORY_SHARED_MERGE_ACROSS_NODES)) {
+            ret = nodeSetMemoryParameterValue("merge_across_nodes", param);
+
             /* Out of memory */
             if (ret == -2)
                 return -1;
@@ -1060,8 +1069,9 @@ nodeGetMemoryParameterValue(const char *field,
     if ((tmp = strchr(buf, '\n')))
         *tmp = '\0';
 
-    if (STREQ(field, "pages_to_scan") ||
-        STREQ(field, "sleep_millisecs"))
+    if (STREQ(field, "pages_to_scan")   ||
+        STREQ(field, "sleep_millisecs") ||
+        STREQ(field, "merge_across_nodes"))
         rc = virStrToLong_ui(buf, NULL, 10, (unsigned int *)value);
     else if (STREQ(field, "pages_shared")    ||
              STREQ(field, "pages_sharing")   ||
@@ -1084,7 +1094,7 @@ cleanup:
 }
 #endif
 
-#define NODE_MEMORY_PARAMETERS_NUM 7
+#define NODE_MEMORY_PARAMETERS_NUM 8
 int
 nodeGetMemoryParameters(virConnectPtr conn ATTRIBUTE_UNUSED,
                         virTypedParameterPtr params ATTRIBUTE_UNUSED,
@@ -1096,6 +1106,7 @@ nodeGetMemoryParameters(virConnectPtr conn ATTRIBUTE_UNUSED,
 #ifdef __linux__
     unsigned int pages_to_scan;
     unsigned int sleep_millisecs;
+    unsigned int merge_across_nodes;
     unsigned long long pages_shared;
     unsigned long long pages_sharing;
     unsigned long long pages_unshared;
@@ -1189,6 +1200,17 @@ nodeGetMemoryParameters(virConnectPtr conn ATTRIBUTE_UNUSED,
 
             break;
 
+        case 7:
+            if (nodeGetMemoryParameterValue("merge_across_nodes",
+                                            &merge_across_nodes) < 0)
+                return -1;
+
+            if (virTypedParameterAssign(param, VIR_NODE_MEMORY_SHARED_MERGE_ACROSS_NODES,
+                                        VIR_TYPED_PARAM_UINT, merge_across_nodes) < 0)
+                return -1;
+
+            break;
+
         default:
             break;
         }
diff --git a/tools/virsh-host.c b/tools/virsh-host.c
index 5cf192de65b90dadc48bd2275055fa4c5441f8e1..106f5e9e0d3d6ab6bd668aa02ec9787dc62ac756 100644
--- a/tools/virsh-host.c
+++ b/tools/virsh-host.c
@@ -920,6 +920,8 @@ static const vshCmdOptDef opts_node_memory_tune[] = {
     {"shm-sleep-millisecs", VSH_OT_INT, VSH_OFLAG_NONE,
       N_("number of millisecs the shared memory service should "
          "sleep before next scan")},
+    {"shm-merge-across-nodes", VSH_OT_INT, VSH_OFLAG_NONE,
+      N_("Specifies if pages from different numa nodes can be merged")},
     {NULL, 0, 0, NULL}
 };
 
@@ -931,6 +933,7 @@ cmdNodeMemoryTune(vshControl *ctl, const vshCmd *cmd)
     unsigned int flags = 0;
     unsigned int shm_pages_to_scan = 0;
     unsigned int shm_sleep_millisecs = 0;
+    unsigned int shm_merge_across_nodes = 0;
     bool ret = false;
     int i = 0;
 
@@ -946,12 +949,21 @@ cmdNodeMemoryTune(vshControl *ctl, const vshCmd *cmd)
         return false;
     }
 
+    if (vshCommandOptUInt(cmd, "shm-merge-across-nodes",
+                          &shm_merge_across_nodes) < 0) {
+        vshError(ctl, "%s", _("invalid shm-merge-across-nodes number"));
+        return false;
+    }
+
     if (shm_pages_to_scan)
         nparams++;
 
     if (shm_sleep_millisecs)
         nparams++;
 
+    if (shm_merge_across_nodes)
+        nparams++;
+
     if (nparams == 0) {
         /* Get the number of memory parameters */
         if (virNodeGetMemoryParameters(ctl->conn, NULL, &nparams, flags) != 0) {
@@ -1003,6 +1015,14 @@ cmdNodeMemoryTune(vshControl *ctl, const vshCmd *cmd)
                 goto error;
         }
 
+        if (i < nparams && shm_merge_across_nodes) {
+            if (virTypedParameterAssign(&params[i++],
+                                        VIR_NODE_MEMORY_SHARED_MERGE_ACROSS_NODES,
+                                        VIR_TYPED_PARAM_UINT,
+                                        shm_merge_across_nodes) < 0)
+                goto error;
+        }
+
         if (virNodeSetMemoryParameters(ctl->conn, params, nparams, flags) != 0)
             goto error;
         else
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 2d90b7bdecad8dd6ed6ac445cbb03197c88fb013..0481e1fb54899e5ed827c33d3c82f7cffae65ec2 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -303,7 +303,10 @@ Allows you to display or set the node memory parameters.
 I<shm-pages-to-scan> can be used to set the number of pages to scan
 before the shared memory service goes to sleep; I<shm-sleep-millisecs>
 can be used to set the number of millisecs the shared memory service should
-sleep before next scan.
+sleep before next scan; I<shm-merge-across-nodes> specifies if pages from
+different numa nodes can be merged. When set to 0, only pages which physically
+reside in the memory area of same NUMA node can be merged. When set to 1,
+pages from all nodes can be merged. Default to 1.
 
 =item B<capabilities>