• Vikas Shivappa's avatar
    perf/x86/mbm: Add Intel Memory B/W Monitoring enumeration and init · 33c3cc7a
    Vikas Shivappa authored
    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: default avatarVikas Shivappa <vikas.shivappa@linux.intel.com>
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Reviewed-by: default avatarTony Luck <tony.luck@intel.com>
    Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Matt Fleming <matt@codeblueprint.co.uk>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Vince Weaver <vincent.weaver@maine.edu>
    Cc: fenghua.yu@intel.com
    Cc: h.peter.anvin@intel.com
    Cc: ravi.v.shankar@intel.com
    Cc: vikas.shivappa@intel.com
    Link: http://lkml.kernel.org/r/1457652732-4499-4-git-send-email-vikas.shivappa@linux.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    33c3cc7a
cpufeatures.h 16.8 KB