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    SubjectRe: [PATCH] Enhance perf to collect KVM guest os statistics from host side
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    Andi Kleen <andi@firstfloor.org> writes:

    > 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

    It's not that I personally want to profile a particular python
    program. I'm interested in the more general problem of extracting more
    information from profiled user space programs than just stack traces.

    Examples:

    - What is going on inside QEMU?

    - Which client is the X server servicing?

    - What parts of a python/shell/scheme/javascript program is
    taking the most CPU time?

    I don't think the oprofile JIT interface solves any of these
    problems. (In fact, I don't see why the JIT problem is even hard. The
    JIT compiler can just generate a little ELF file with symbols in it,
    and the profiler can pick it up through the mmap events that you get
    through the perf interface).

    > 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?

    I am bringing this up because I want to extend sysprof to be more
    useful.


    Soren


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