Re: [GIT PULL] Performance Counters for Linux

Al Viro
2009-06-12T04:06:23Z

On Thu, Jun 11, 2009 at 07:58:37PM -0700, Linus Torvalds wrote:
>
>
> On Fri, 12 Jun 2009, Al Viro wrote:
> >
> > So could you please clarify the situation? If the ABI compatibility
> > requirements remain the same as they used to be, whether the userland code
> > is in-tree or not, I'm fine with the entire thing. If they do not (and *ONLY*
> > in that case), I think we have a real problem.
>
> I think the ABI requirements are the same.

OK, then.

> That said, I also suspect that as with oprofile itself, we'll end up
> having expansions of the ABI that may well be CPU-specific. I also suspect
> that there will probably be breakage early on just because things will
> inevitably settle.
>
> And I think that for something like a profiling tool, such breakage is
> much more acceptable than for the actual binaries you'd profile. It's not
> like we're talking about breaking the boot or functionality of a machine,
> as happens when we break the X server (which has happened).

Sure.