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

[Peter Zijlstra]

On Mon, Aug 12, 2013 at 09:02:02AM -0700, Andi Kleen wrote:
> "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx> 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.
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