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    SubjectRe: [PATCH] Enhance perf to collect KVM guest os statistics from host side
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    Soeren Sandmann <sandmann@daimi.au.dk> writes:

    > [...]
    > - 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?
    > [...]

    These kinds of questions usually require navigation through internal
    data of the user-space process ("Where in this linked list is this
    pointer?"), and often also correlating them with history ("which
    socket/fd was most recently serviced?").

    Systemtap excels at letting one express such things.

    - FChE


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