Re: [RFC v2 0/6] x86: dynamic indirect branch promotion

[Peter Zijlstra]

On Tue, Jan 08, 2019 at 10:28:02AM -0800, Nadav Amit wrote:
> Is it really that important for debugging to get the instructions at the
> time of execution? Wouldnât it be easier to annotate the instructions that
> might change? After all, it is not as if any instruction can change to any
> other instruction.

I think PT has a bitstream encoding of branch-taken; to decode and
follow the actual code-flow you then need to have the actual and
accurate branch target from the code. If we go muck about with the code
and change that, decoding gets somewhat 'tricky'.

Or something along those lines..