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

[Andi Kleen]

On Monday 03 December 2007 14:53:27 Markus Metzger wrote:
> > Cool.  It's been on my list to look into exposing those features
> > somehow. I hadn't planned on doing it until after the utrace stuff
> > settles and there is a more coherent interface context in which to do
> > it.
> 
> I'm looking very much forward to utrace. From what I read so far, this is
> a much nicer interface.

Just don't wait for that. utrace doesn't seem to have any concrete 
plans to merge any time soon AFAIK[1] and it would be a shame to delay an useful
feature forever.

[1] At least the patches have not reached any mailing lists

> What did you have in mind when you asked for kernel-mode support?

I asked about that earlier too and I would like to see per CPU traces
for ring 0 with some way to dump that on crashes or on user trigger.

-Andi

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