HI Everyone
My name is diego. I'm very interesting in extend the XenOprof to ARM64 based architectures, and also integrate some tools for hypervisor and application profiling and performance evaluation. I read the documentation for Oprofile a perf which is in the wiki page and I noticed that XEN doesn't support ARM64 architectures. For this reason I have two ideas. 1. Add support for ARM64 architectures to XenOprof in its current implementation. 2. I found an interesting library called libpfm4 which also work with perf_event, and support ARM64 and ARM32 architectures. Well I can tray to use this library in order to profile DOM0 and DOMU-VP guest. Personally I prefer the option 2 since the library currently works in normal linux OS and I guest could be easy to replicate it on XEN. Approaches: (hypercalls) from DOM0-DOMU to xen (direct pass through from DOM0 to PMU counters), and VPMU in DOMU . Here my questions? I would like to know if currently DOM0 and DOMU have support to perf_event i.e., they can read directly performance monitoring unit (PMU) counters, only DOM0 or none of them? should I implement some traps in XEN hypervisor ? someone currently is working on this? Which is the most efficient way to implement it ? There is a guide line to do this easily? Cheers. -- Diego Alejandro Parra Guzmán Estudiante de ingeniería electrónica Universidad distrital FJC
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