[libvirt] [PATCH 2/4] LXC: allow uses advisory nodeset from querying numad

[Gao feng]

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 <gaof...@cn.fujitsu.com>
---
 src/lxc/lxc_controller.c | 84 ++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 74 insertions(+), 10 deletions(-)

diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index 15aa334..b6c1fe8 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -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
@@ -409,7 +410,8 @@ cleanup:
 }
 
 #if WITH_NUMACTL
-static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl)
+static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl,
+                                           virBitmapPtr nodemask)
 {
     nodemask_t mask;
     int mode = -1;
@@ -418,9 +420,22 @@ static int 
virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl)
     int i = 0;
     int maxnode = 0;
     bool warned = false;
-
-    if (!ctrl->def->numatune.memory.nodemask)
+    virDomainNumatuneDef numatune = ctrl->def->numatune;
+    virBitmapPtr tmp_nodemask = NULL;
+
+    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");
 
@@ -435,7 +450,7 @@ 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);
@@ -488,7 +503,8 @@ 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",
@@ -549,6 +565,40 @@ 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 = virGetNumadAdvice(ctrl->def->vcpus,
+                                    ctrl->def->mem.cur_balloon);
+        if (!nodeset)
+            goto cleanup;
+
+        VIR_DEBUG("Nodeset returned from numad: %s", nodeset);
+
+        ret = virBitmapParse(nodeset, 0, &nodemask, VIR_DOMAIN_CPUMASK_LEN);
+        if (ret < 0)
+            goto cleanup;
+    }
+    ret = 0;
+    *mask = nodemask;
+
+cleanup:
+    VIR_FREE(nodeset);
+    return ret;
+}
+
+
 /**
  * virLXCControllerSetupResourceLimits
  * @ctrl: the controller state
@@ -560,14 +610,28 @@ static int 
virLXCControllerSetupCpuAffinity(virLXCControllerPtr ctrl)
  */
 static int virLXCControllerSetupResourceLimits(virLXCControllerPtr ctrl)
 {
+    virBitmapPtr nodemask = NULL;
+    int ret;
 
-    if (virLXCControllerSetupCpuAffinity(ctrl) < 0)
-        return -1;
+    ret = virLXCControllerGetNumadAdvice(ctrl, &nodemask);
+    if (ret < 0)
+        goto cleanup;
 
-    if (virLXCControllerSetupNUMAPolicy(ctrl) < 0)
-        return -1;
+    ret = virLXCControllerSetupCpuAffinity(ctrl);
+    if (ret < 0)
+        goto cleanup;
+
+    ret = virLXCControllerSetupNUMAPolicy(ctrl, nodemask);
+    if (ret < 0)
+        goto cleanup;
 
-    return virLXCCgroupSetup(ctrl->def);
+    ret = virLXCCgroupSetup(ctrl->def);
+    if (ret < 0)
+        goto cleanup;
+
+cleanup:
+    virBitmapFree(nodemask);
+    return ret;
 }
 
 
-- 
1.7.11.7

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