LXC: allow uses advisory nodeset from querying numad

Allow lxc using the advisory nodeset from querying numad,
this means if user doesn't specify the numa nodes that
the lxc domain should assign to, libvirt will automatically
bind the lxc domain to the advisory nodeset which queried from
numad.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>

src/lxc/lxc_controller.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2012 Red Hat, Inc.
+ * Copyright (C) 2010-2013 Red Hat, Inc.
  * Copyright IBM Corp. 2008
  *
  * lxc_controller.c: linux container process controller
@@ -69,6 +69,7 @@
 #include "nodeinfo.h"
 #include "virrandom.h"
 #include "virprocess.h"
+#include "virnuma.h"
 #include "rpc/virnetserver.h"
 
 #define VIR_FROM_THIS VIR_FROM_LXC
@@ -469,7 +470,8 @@ cleanup:
 }
 
 #if WITH_NUMACTL
-static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl)
+static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl,
+                                           virBitmapPtr nodemask)
 {
     nodemask_t mask;
     int mode = -1;
@@ -478,9 +480,22 @@ static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl)
     int i = 0;
     int maxnode = 0;
     bool warned = false;
+    virDomainNumatuneDef numatune = ctrl->def->numatune;
+    virBitmapPtr tmp_nodemask = NULL;
 
-    if (!ctrl->def->numatune.memory.nodemask)
+    if (numatune.memory.placement_mode ==
+        VIR_DOMAIN_NUMATUNE_MEM_PLACEMENT_MODE_STATIC) {
+        if (!numatune.memory.nodemask)
+            return 0;
+        VIR_DEBUG("Set NUMA memory policy with specified nodeset");
+        tmp_nodemask = numatune.memory.nodemask;
+    } else if (numatune.memory.placement_mode ==
+               VIR_DOMAIN_NUMATUNE_MEM_PLACEMENT_MODE_AUTO) {
+        VIR_DEBUG("Set NUMA memory policy with advisory nodeset from numad");
+        tmp_nodemask = nodemask;
+    } else {
         return 0;
+    }
 
     VIR_DEBUG("Setting NUMA memory policy");
 
@@ -495,7 +510,7 @@ static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl)
     /* Convert nodemask to NUMA bitmask. */
     nodemask_zero(&mask);
     i = -1;
-    while ((i = virBitmapNextSetBit(ctrl->def->numatune.memory.nodemask, i)) >= 0) {
+    while ((i = virBitmapNextSetBit(tmp_nodemask, i)) >= 0) {
         if (i > NUMA_NUM_NODES) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("Host cannot support NUMA node %d"), i);
@@ -548,7 +563,8 @@ cleanup:
     return ret;
 }
 #else
-static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl)
+static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl,
+                                           virBitmapPtr nodemask ATTRIBUTE_UNUSED)
 {
     if (ctrl->def->numatune.memory.nodemask) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
@@ -609,6 +625,40 @@ static int virLXCControllerSetupCpuAffinity(virLXCControllerPtr ctrl)
 }
 
 
+static int virLXCControllerGetNumadAdvice(virLXCControllerPtr ctrl,
+                                          virBitmapPtr *mask)
+{
+    virBitmapPtr nodemask = NULL;
+    char *nodeset;
+    int ret = -1;
+
+    /* Get the advisory nodeset from numad if 'placement' of
+     * either <vcpu> or <numatune> is 'auto'.
+     */
+    if ((ctrl->def->placement_mode ==
+         VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO) ||
+        (ctrl->def->numatune.memory.placement_mode ==
+         VIR_DOMAIN_NUMATUNE_MEM_PLACEMENT_MODE_AUTO)) {
+        nodeset = virNumaGetAutoPlacementAdvice(ctrl->def->vcpus,
+                                                ctrl->def->mem.cur_balloon);
+        if (!nodeset)
+            goto cleanup;
+
+        VIR_DEBUG("Nodeset returned from numad: %s", nodeset);
+
+        if (virBitmapParse(nodeset, 0, &nodemask, VIR_DOMAIN_CPUMASK_LEN) < 0)
+            goto cleanup;
+    }
+
+    ret = 0;
+    *mask = nodemask;
+
+cleanup:
+    VIR_FREE(nodeset);
+    return ret;
+}
+
+
 /**
  * virLXCControllerSetupResourceLimits
  * @ctrl: the controller state
@@ -621,14 +671,23 @@ static int virLXCControllerSetupCpuAffinity(virLXCControllerPtr ctrl)
 static int virLXCControllerSetupResourceLimits(virLXCControllerPtr ctrl,
                                                virCgroupPtr cgroup)
 {
+    virBitmapPtr nodemask = NULL;
+    int ret = -1;
+
+    if (virLXCControllerGetNumadAdvice(ctrl, &nodemask) < 0 ||
+        virLXCControllerSetupNUMAPolicy(ctrl, nodemask) < 0)
+        goto cleanup;
 
     if (virLXCControllerSetupCpuAffinity(ctrl) < 0)
-        return -1;
+        goto cleanup;
 
-    if (virLXCControllerSetupNUMAPolicy(ctrl) < 0)
+    if (virLXCCgroupSetup(ctrl->def, cgroup) < 0)
-        return -1;
+        goto cleanup;
 
-    return virLXCCgroupSetup(ctrl->def, cgroup);
+    ret = 0;
+cleanup:
+    virBitmapFree(nodemask);
+    return ret;
 }