Some Xen VMs run at a host, I want to collect performance couter data in each Xen VM. Can I use PAPI the VMs ?
danterpstra wrote:A recent paper titled "Perfctr-Xen: A Framework for Performance Counter Virtualization" (portal.acm.org/ft_gateway.cfm?id=1952687&type=pdf) discusses patching the host kernel with a modified version of perfctr and then patching the guest kernel with a second modified perfctr to allow the transfer of performance counter information across the host/guest boundary. They illustrate the use of this mechanism by running PAPI tests in the guest with reasonable results.
If you're brave enough, you may want to try this approach.
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