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graphic: 0.921
device: 0.828
instruction: 0.619
semantic: 0.558
mistranslation: 0.272
other: 0.248
network: 0.220
KVM: 0.183
vnc: 0.144
boot: 0.059
assembly: 0.027
socket: 0.026
always zero when query-dirty-rate
Description of problem:
The creation of VM works well(by virt-install), and I can enter it by 'virsh console or ssh'.
Now, I try to use qemu's feature: calc-dirty-rate.
But, always get '"dirty-rate":0' when 'query-dirty-rate', occasionally '"dirty-rate":2'.
At the same time, I run 'mbw'(mbw -t0 -n 1000000 1024 -q) in vm, a memcpy-intensive benchmark.
I'm not sure if some configurations of QEMU/KVM are not enabled.
looking forward to your reply!
Steps to reproduce:
```
1. virsh qemu-monitor-command centos-huazhang '{"execute":"calc-dirty-rate", "arguments": {"calc-time": 1}}'
{"return":{},"id":"libvirt-16"}
2. virsh qemu-monitor-command centos-huazhang1 '{"execute":"query-dirty-rate"}'
{"return":{"status":"measured","sample-pages":512,"dirty-rate":0,"mode":"page-sampling","start-time":607266,"calc-time":1},"id":"libvirt-17"}
```
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