Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...

Pull perf/core refactorings and improvements from Arnaldo Carvalho de Melo:

User visible changes:

  - Add hint for 'Too many events are opened.' error message (Jiri Olsa)

Infrastructure changes:

  - Protect accesses to map rbtrees with a lock and refcount struct map,
    reducing memory usage as maps not used get freed. The 'dso' struct is
    next in line. (Arnaldo Carvalho de Melo)

  - Annotation and branch related option parsing refactorings to
    share code with upcoming patches (Andi Kleen)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>