[Libvir] [PATCH][RFC] shows scheduler information

[Atsushi SAKAI]

Hi,

This patch intends to see and handle scheduler parameters.
This is based on ML discussion.
This patch just support Xen/Credit for Type/Parameters
                        Xen/SEDF   for Type only.
And other scheduler is not supported 
but it will be easy to add it.

===How to use (at commandline)===
virsh schedinfo 0 
    (to see Type/Parameters)

virsh schedinfo 0 --weight 512 
    (to set weight and to show changed Type/Parameters)

virsh schedinfo 0 --cap 50
    (to set cap and to show changed Type/Parameters)


===Related to API=== 
I make API based on Dan's mail.
But I have added a little bit changes.

1)virSchedParameter
  Add Unsigned Int and Unsigned Long Long

2)virDomainGetSchedulerType
  Add variable to return the number of parameters.
  This purposes allocate virSchedParameter memory on virsh not in libvirt.

===Others===
0)xen_unified.c
  tabspace seems 2, it should be fixed.
  If needed, I will post it as another patch.

Thanks
Atsushi SAKAI



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