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我在使用qemu-kvm运行并由libvirt管理（主要由virt-manager创建并运行）的虚拟机（guest虚拟机窗口7，x86_64）中遇到了一些问题。问题是，我也不能运行无法获得libvirt域的所有内存统计信息
virsh -c qemu:///system dommemstat win7
或致电
virDomainMemoryStats(...)
C++代码（这是，据我了解，或多或少同样的事情）得到充分的内存统计。我也从libvirt aplication dev guide测试libvirt第35个例子。这真的让我担心，因为现在我在项目中工作，目的是为vm自动设置最佳内存大小，因此我需要在我的代码中使用它们。
我从的virsh得到的唯一输出是
actual 4194304
last_update 1500404513
rss 4161676
搜索，我发现，这些都是统计数据，其libvirt的可以获取未向司机膨胀的网络后。不过，我已经在Windows中安装了VirtIO气球驱动程序，并且系统声称它正在运行。我真的不知道，如何确定qemu是否意识到这一点（为您的想法打开）。
另外我发现我需要在系统xml中设置统计周期，我已经做了哪些，哪些没有给出。我还发现，QEMU使用一些“库姆，获得”脚本实际测量统计，但我不能从
virsh # qemu-monitor-command 1 --hmp "qom-get"
（输出该命令是未知的）使用它，我不能看到它在我的道路。另外pacman -Fo qom-get和pkgfile qom-get什么也不给。 我的主机系统是Arch Linux。 win7.xml的内容是
<domain type='kvm'>
<name>win7</name>
<uuid>438145c1-a2df-4c86-96d6-2bf7b379d70b</uuid>
<memory unit='KiB'>4194304</memory>
<currentMemory unit='KiB'>4194304</currentMemory>
<vcpu placement='static' current='2'>4</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.9'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
</hyperv>
<vmport state='off'/>
</features>
<cpu mode='custom' match='exact' check='partial'>
<model fallback='allow'>Broadwell-noTSX</model>
</cpu>
<clock offset='localtime'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
<timer name='hypervclock' present='yes'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/sbin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/win7.qcow2'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdb' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/usr/share/virtio/virtio-win.iso'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:9d:4e:85'/>
<source network='default'/>
<model type='rtl8139'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' autoport='yes'>
<listen type='address'/>
<image compression='off'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='2'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='3'/>
</redirdev>
<memballoon model='virtio'>
<stats period='10'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</memballoon>
</devices>
</domain>
我绝对错过了一些东西，但我什么也看不见。任何人都可以给我任何有用的链接或指南吗？我真的很感激。
这是question on Arch Linux newbie forum的重复。如果有人会给出适当的答案，我会与其他网站分享。
============================================== ==
UPD。气球的工作：我可以做这样的事情
virsh # qemu-monitor-command win7 --hmp "info balloon"
balloon: actual=4096
virsh # qemu-monitor-command win7 --hmp "balloon 2048"
virsh # qemu-monitor-command win7 --hmp "info balloon"
balloon: actual=2048
但库姆，获得不会做：
virsh # qemu-monitor-command windows7 '{ "execute": "qom-get", "arguments": { "path": "/machine/peripheral/balloon0", "property": "guest-stats" } }'
{"return":{"stats":{"stat-swap-out":-1,"stat-available-memory":-1,"stat-free-memory":-1,"stat-minor-faults":-1,"stat-major-faults":-1,"stat-total-memory":-1,"stat-swap-in":-1},"last-update":1500639136},"id":"libvirt-396"}
帮助将非常感激。