[Xen-devel] Performance Monitor and Profiling tools for ARM64

[Diego Alejandro Parra Guzman <daparrag@xxxxxxxxxxxxxxxxxxxxxxxx>]

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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