Re: [Qemu-devel] Register usage statistics?

[Peter Maydell]

On 26 August 2011 18:35, Lluís <address@hidden> wrote:
> Benjamin Ylvisaker writes:
>> I am working on a project for which I'd like to gather statistics
>> about register usage.  (For example, distributions of degree-of-use
>> and dynamic lifetimes of register-values.)  Is QEMU a good tool for
>> doing this kind of work?  Has anyone else done this?  I looked at the
>> tracing available in QEMU and it seems to be mostly for higher level
>> things like memory accesses, function calls, basic block executions,
>> etc.
>
> This is not currently possible.
>
> In fact, I've been developing (somewhat in the background) the kind of
> features you're asking for, but it will still be at least a couple of
> months before it's in a publishable state.

Interesting. I know the folks at STM have also done work in this
area (see the QEMU Users Forum talk they did about dynamic tracing).
Would you mind giving a quick summary of the sort of approach you've
taken? I'm wondering if there's much overlap or if you and they are
really addressing different problems.

thanks
-- PMM