On 07/26/2016 01:15 AM, Andi Kleen wrote: > You definitely need a new flag: atomic or per thread instrumentation > will almost certainly have significant overhead (either at run time > or in memory). Just making an existing facility a lot of slower > without a way around it is not a good idea.
Hi Agree with that! > > BTW iirc there were patches from google on this a few years back. > May be still in some branch. That's great, I'm CCing Google people who worked on PGO, hope they will help me to find patches/discussion about the problem. Martin > > -Andi
