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    SubjectRe: [PATCH] Enhance perf to collect KVM guest os statistics from host side
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    On Tue, 2010-03-23 at 11:10 -0300, Arnaldo Carvalho de Melo wrote:
    > Em Tue, Mar 23, 2010 at 02:49:01PM +0100, Andi Kleen escreveu:
    > > Soeren Sandmann <sandmann@daimi.au.dk> writes:
    > > > To fix that problem, it seems like we need some way to have python
    > > > export what is going on. Maybe the same mechanism could be used to
    > > > both access what is going on in qemu and python.
    > >
    > > oprofile already has an interface to let JITs export
    > > information about the JITed code. C Python is not a JIT,
    > > but presumably one of the python JITs could do it.
    > >
    > > http://oprofile.sourceforge.net/doc/devel/index.html
    > >
    > > I know it's not envogue anymore and you won't be a approved
    > > cool kid if you do, but you could just use oprofile?
    >
    > perf also has supports for this and Pekka Enberg's jato uses it:
    >
    > http://penberg.blogspot.com/2009/06/jato-has-profiler.html

    Right, we need to move that into a library though (always meant to do
    that, never got around to doing it).

    That way the app can link against a dso with weak empty stubs and have
    perf record LD_PRELOAD a version that has a suitable implementation.

    That all has the advantage of not exposing the actual interface like we
    do now.


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