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SubjectRE: [patch] x86, ptrace: support pebs in ds.c and disable ptraceand ds support
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>-----Original Message-----
>From: Ingo Molnar [mailto:mingo@elte.hu]
>Sent: Freitag, 21. März 2008 13:54


>> Ds.c is meant to be the resource allocator for per-thread and per-cpu
>> BTS and PEBS recording.
>> It is used by ptrace to provide execution tracing of debugged tasks.
>> It will be used by utrace for the same purpose.
>> It will be used by profilers (e.g. perfmon2).
>> It may be used by kernel debuggers to provide a kernel
>execution trace.
>
>we could apply this if Roland Acks it -

I moved Roland to the To: list. I hope we can resolve this in a technical discussion.


>but i guess a precondition for
>that is to not include more ptrace extensions and to also
>start working
>on utrace support for it. Ptrace is something we want to reduce usage
>of, not extend.

The patch is targeting application debuggers (in the first place). As far as I know, today's application debuggers are using ptrace. And I expect them to continue to use ptrace for some time.

I would not want to exclude existing debuggers from this feature; nor would I want to put a too big burden on debuggers if they wished to support execution tracing.

I will look into utrace as an additional interface.

Until utrace has been adopted by debuggers, I think ptrace (as its predecessor) is a good choice for an interim solution.


regards,
markus.
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