Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/26363

Log:
commit e92c9bb16ae2ba4594b4e3dd1e1acb5ac19f72fa
Author: Wangpan <hzwangpan at corp.netease.com>
Date:   Mon Apr 8 17:57:10 2013 +0800

    Add cpuset attr to vcpu conf in libvirt xml
    
    Currently the instances can use all of the pcpu of compute node, the
    host may become slow when vcpus of instances are busy, so we need to
    pin vcpus to the specific pcpus of host instead of all pcpus.
    Also added a cache of total vcpus num in libvirt driver here.
    
    DocImpact: please refer to the bp page.
    Implements blueprint: instance-vcpu-pin
    Change-Id: I6b6e805c15b249cc5e7517e26619d79bb0183de8