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    SubjectRe: DTrace-like analysis possible with future Linux kernels?
    On Sun, 22 Aug 2004, Alan Cox wrote:

    > On Sul, 2004-08-22 at 19:27, Tomasz K?oczko wrote:
    >> Using yor thing path: KProbe/Dtrace is for development and yes it must
    >> depend on DEBUG_KERNEL.
    >> ptrace() is also for tracing and ver offen used by developers but it is
    >> enabled by default and it is not only for developers. So .. ptrace() must
    >> also depend on DEBUG_KERNEL.
    > ptrace is for debugging user space, as for example is oprofile. kprobes
    > is for debugging including kernel internal goings on

    Yes. It *is* for debuging/tracing in kernel space but like DTrace is
    *also* in user space.

    >> compilation stage). In Solaris kernel exist few thousands avalaible probes
    >> and IIRC only very small subset is "near zero effect" (uses nop
    >> instructions).
    > Sounds like a kprobes clone 8).

    Look on some time stamps both projects.
    Seems KProbes is clone DTrace ..

    >>> OProfile doesn't require this.
    >> As same as KProbe/DTrace. Can you use OProfile for something other tnan
    >> profiling ? Probably yes and this answer opens: probably it will be good
    >> prepare some common code for KProbe and Oprofile.
    > Oprofile lets you work on stuff like cache affinity, tuning array walks
    > and prefetches. Short of running the app under cachegrind its one of the
    > most detailed ways of getting all the profile register data from the x86
    > processors.

    The same is KProbes but you can combined with small programs associated
    with called probes. Again: DTrace/KProbes is much more than traditional
    profiling/tracing/measuring tools.

    >> So it will be good stop disscuss about "yes or no ?" and start about
    >> "how and when in Linux ?" ..
    > When you send patches ?

    KProbes patches was annouced on lkml few times.

    *Ludzie nie mają problemów, tylko sobie sami je stwarzają*
    Tomasz Kłoczko, sys adm|*e-mail:*
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