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