Comment 10 for bug 1573231

According to my bisect this commit is responsible:

commit 8ae10f463b7ae3455e9d0507176349c76580995f
Author: Vikas Shivappa <email address hidden>
Date: Thu Mar 10 15:32:09 2016 -0800

    perf/x86/mbm: Add Intel Memory B/W Monitoring enumeration and init

    BugLink: http://bugs.launchpad.net/bugs/1397880

    The MBM init patch enumerates the Intel MBM (Memory b/w monitoring)
    and initializes the perf events and datastructures for monitoring the
    memory b/w.

    Its based on original patch series by Tony Luck and Kanaka Juvva.

    Memory bandwidth monitoring (MBM) provides OS/VMM a way to monitor
    bandwidth from one level of cache to another. The current patches
    support L3 external bandwidth monitoring. It supports both 'local
    bandwidth' and 'total bandwidth' monitoring for the socket. Local
    bandwidth measures the amount of data sent through the memory controller
    on the socket and total b/w measures the total system bandwidth.

    Extending the cache quality of service monitoring (CQM) we add two
    more events to the perf infrastructure:

      intel_cqm_llc/local_bytes - bytes sent through local socket memory controller
      intel_cqm_llc/total_bytes - total L3 external bytes sent

    The tasks are associated with a Resouce Monitoring ID (RMID) just like
    in CQM and OS uses a MSR write to indicate the RMID of the task during
    scheduling.

    Signed-off-by: Vikas Shivappa <email address hidden>
    Signed-off-by: Peter Zijlstra (Intel) <email address hidden>
    Reviewed-by: Tony Luck <email address hidden>
    Acked-by: Thomas Gleixner <email address hidden>
    Cc: Alexander Shishkin <email address hidden>
    Cc: Andy Lutomirski <email address hidden>
    Cc: Arnaldo Carvalho de Melo <email address hidden>
    Cc: Borislav Petkov <email address hidden>
    Cc: Brian Gerst <email address hidden>
    Cc: David Ahern <email address hidden>
    Cc: Denys Vlasenko <email address hidden>
    Cc: H. Peter Anvin <email address hidden>
    Cc: Jiri Olsa <email address hidden>
    Cc: Linus Torvalds <email address hidden>
    Cc: Matt Fleming <email address hidden>
    Cc: Namhyung Kim <email address hidden>
    Cc: Peter Zijlstra <email address hidden>
    Cc: Stephane Eranian <email address hidden>
    Cc: Vince Weaver <email address hidden>
    Cc: <email address hidden>
    Cc: <email address hidden>
    Cc: <email address hidden>
    Cc: <email address hidden>
    Link: http://lkml<email address hidden>
    Signed-off-by: Ingo Molnar <email address hidden>
    (back ported from commit 33c3cc7acfd95968d74247f1a4e1b0727a07ed43)
    Signed-off-by: Tim Gardner <email address hidden>

     Conflicts:
        arch/x86/kernel/cpu/common.c