[Bug gcov-profile/89307] -fprofile-generate binary may be too slow in multithreaded environment due to cache-line conflicts on counters

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89307

--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 45703
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45703&action=edit
patch for tls counters (incomplete - no runtime bits)

Also I think google's code to reduce cacheline conflicts is
https://gcc.gnu.org/ml/gcc-patches/2012-05/msg00959.html