Re: [RFC] gcc feature request: Moving blocks into sections

Peter Zijlstra
2013-08-12T16:11:56Z

On Mon, Aug 12, 2013 at 09:02:02AM -0700, Andi Kleen wrote:
> "H. Peter Anvin" <hpa@linux.intel.com> writes:
>
> > However, I would really like to
> > understand what the value is.
>
> Probably very little. When I last looked at it, the main overhead in
> perf currently seems to be backtraces and the ring buffer, not this
> code.

backtraces do indeed blow and make pretty much everything else
irrelevant, but when not using them the branch forest was significant
when I last looked at it.