[PATCH v2 7/7] xl: docs for xl config vnuma options

[Elena Ufimtseva <ufimtseva@gmail.com>]

Documentation added to xl command regarding usage of vnuma
configuration options.

Signed-off-by: Elena Ufimtseva <ufimtseva@gmail.com>
---
 docs/man/xl.cfg.pod.5 |   55 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index d2d8921..db25521 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -216,6 +216,61 @@ if the values of B<memory=> and B<maxmem=> differ.
 A "pre-ballooned" HVM guest needs a balloon driver, without a balloon driver
 it will crash.
 
+=item B<vnuma_nodes=N>
+
+Number of vNUMA nodes the guest will be initialized with on boot. In general case,
+this is the only required option. If only this option is given, all other
+vNUMA topology parameters will be taken as default.
+ 
+=item B<vnuma_mem=[vmem1, vmem2, ...]>
+ 
+The vnode memory sizes defined in MBytes. If the sum of all vnode memories 
+does not match the domain memory or not all the nodes defined here, the total 
+memory will be equally split between vnodes.
+
+Example: vnuma_mem=[1024, 1024, 2048, 2048]
+
+=item B<vdistance=[d1, d2, ... ,dn]>
+
+Defines the distance table for vNUMA nodes. Distance for NUMA machines usually 
+ represented by two dimensional array and all distance may be spcified in one
+line here, by rows. In short, distance can be specified as two numbers [d1, d2],
+where d1 is same node distance, d2 is a value for all other distances.
+If vdistance was specified with errors, the defaul distance in use, e.g. [10, 20].
+
+Examples:
+vnodes = 3
+vdistance=[10, 20]
+will expand to this distance table (this is default setting as well):
+[10, 20, 20]
+[20, 10, 20]
+[20, 20, 10]
+ 
+=item B<vnuma_vcpumap=[vcpu1, vcpu2, ...]>
+ 
+Defines vcpu to vnode mapping as a string of integers, representing node
+numbers. If not defined, the vcpus are interleaved over the virtual nodes.
+Current limitation: vNUMA nodes have to have at least one vcpu, otherwise 
+default vcpu_to_vnode will be used.
+Example:
+to map 4 vcpus to 2 nodes - 0,1 vcpu -> vnode1, 2,3 vcpu -> vnode2:
+vnuma_vcpumap = [0, 0, 1, 1] 
+
+=item B<vnuma_vnodemap=[p1, p2, ..., pn]>
+
+vnode to pnode mapping. Can be configured if manual vnode allocation
+required. Will be only taken into effect on real NUMA machines and if
+memory or other constraints do not prevent it. If the mapping is fine,
+automatic NUMA placement will be disabled. If the mapping incorrect,
+automatic NUMA placement will be taken into account when selecting
+physical nodes for allocation, or mask will not be used on non-NUMA 
+machines or if automatic allocation fails. 
+
+Example:
+assume two node NUMA node machine:
+vnuma_vndoemap=[1, 0]
+first vnode will be placed on node 1, second on node0.
+ 
 =back
 
 =head3 Event Actions
-- 
1.7.10.4