Re: [RFC 0/5] perf: Per PMU access controls (paranoid setting)

[Andi Kleen]

> > This new file descriptor argument doesn't exist today so it would
> > need to create a new system call with more arguments
> 
> Is that true? The first argument is a pointer to a struct that
> contains its own size, so it can be expanded without an ABI break. I
> don't see any reason why you couldn't cram more stuff in there.

You're right we could put the fd into the perf_event, but the following is
still true:

> > Obviously we would need to keep the old system call around
> > for compability, so you would need to worry about this
> > interaction in any case!
> >
> > So tying it together doesn't make any sense, because
> > the problem has to be solved separately anyways.


-Andi