On 11/21/2012 02:42 AM, Dennis Chen wrote: [I will note that today's email chain should have been as a new thread, rather than in-reply to a thread from July - changing subject lines and deleting all previous content still doesn't stop your mailer from using In-Reply-To headers] > Yeah, I know. So the email is try to get to know how to use cgroup to > configure the cpu bandwidth of a specific VM, I am writing a separate > project to control the cfs bandwidth of a VM specified, not taking use > of the virsh shell. You do this by modifying the domain XML: http://libvirt.org/formatdomain.html#elementsCPUTuning documents the <cputune> element, which includes the shares, period, and quota tunables that map into the cpu bandwidth cgroup tunables. So, rather than directly modifying cgroup, you should instead be modifying this portion of the XML. Furthermore, if your domain is already running, then you can hotplug the tuning via the virDomainGetSchedulerParametersFlags() and virDomainSetSchedulerParametersFlags() API, with parameter names such as VIR_DOMAIN_SCEDULER_VCPU_PERIOD which maps back to the <period> sub-element of the <cputune> domain XML. These APIs are already exposed via the 'virsh schedinfo' command. -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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