Messages in this thread | | | Date | Tue, 16 Mar 2010 15:37:21 +0200 | From | Avi Kivity <> | Subject | Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side |
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On 03/16/2010 03:31 PM, Ingo Molnar wrote: > >> You can do that through libvirt, but that only works for guests started >> through libvirt. libvirt provides command-line tools to list and manage >> guests (for example autostarting them on startup), and tools built on top of >> libvirt can manage guests graphically. >> >> Looks like we have a layer inversion here. Maybe we need a plugin system - >> libvirt drops a .so into perf that teaches it how to list guests and get >> their symbols. >> > Is libvirt used to start up all KVM guests? If not, if it's only used on some > distros while other distros have other solutions then there's apparently no > good way to get to such information, and the kernel bits of KVM do not provide > it. >
Developers tend to start qemu from the command line, but the majority of users and all distros I know of use libvirt. Some users cobble up their own scripts.
> To the user (and to me) this looks like a KVM bug / missing feature. (and the > user doesnt care where the blame is) If that is true then apparently the > current KVM design has no technically actionable solution for certain > categories of features! >
A plugin system allows anyone who is interested to provide the information; they just need to write a plugin for their management tool.
Since we can't prevent people from writing management tools, I don't see what else we can do.
-- error compiling committee.c: too many arguments to function
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