RE: [patch 0/2] x86, ptrace: support for branch trace store(BTS)

["Metzger, Markus T" <markus.t.metzger@intel.com>]

>> Not yet. We are talking to internal teams regarding gdb support.
>
>But you already have reasonably realistic test code right?

I wrote a small program to talk to ptrace and look at the trace of small
sample programs to test the patch. I do this on P4 32bit and Core2
64bit.

Our debugger team has a prototype implementation for their debugger. But
that will not be available for some time.

I hope that we get gdb support, soon, but that would take a while 
if I had to do it.


>e.g. I'm still feeling a bit uneasy about that global sysctl
>embedded in the interface.

I added a ptrace command to query for the maximal buffer size and moved
the macro to ptrace_bts.h.
I am not sure how much flexibility is actually needed, here. I would
expect
the trace to be very useful near its tail, but unmanageable when it gets
too big.
I would rather add flexibility when and where it is needed.


regards,
markus.
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