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    SubjectRe: [PATCH] x86: add the debugfs interface for the sysprof tool
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    John Levon <levon@movementarian.org> writes:

    > Soren wrote sysprof when he tried an earlier version of oprofile and
    > found it slightly non-obvious. Instead of doing any of these things:

    This is not accurate. Sysprof started by me adding a hierarchical call
    view to speedprof, a SIGPROF profiler which was basically a hack in
    memprof.

    Oprofile did not work on my system at the time (Red Hat 9, I believe),
    and the website said that I had to apply a patch to the kernel and
    recompile, so I didn't try it.

    The hierarchical call view in speedprof worked out so well that I
    wrote a simple kernel module to produce system-wide stacktraces, and
    fed them into speedprof. Since speedprof was just a hack in memprof, I
    wrote a new GUI, and sysprof was born.

    It was only later I tried oprofile and found it not only much more
    difficult to use, but also much less useful when I did get it to work.


    Soren


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