[Xen-devel] Xen Extend Profiling tools for ARM64-architectures.

[Diego-Alejandro Parra-Guzman <diego-alejandro.parra-guzman@xxxxxxxxxx>]

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.


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