According to my bisect this commit is responsible:
commit 8ae10f463b7ae3455e9d0507176349c76580995f
Author: Vikas Shivappa <vikas.shiva...@linux.intel.com>
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 <vikas.shiva...@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Reviewed-by: Tony Luck <tony.l...@intel.com>
Acked-by: Thomas Gleixner <t...@linutronix.de>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Brian Gerst <brge...@gmail.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Denys Vlasenko <dvlas...@redhat.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Matt Fleming <m...@codeblueprint.co.uk>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Stephane Eranian <eran...@google.com>
Cc: Vince Weaver <vincent.wea...@maine.edu>
Cc: fenghua...@intel.com
Cc: h.peter.an...@intel.com
Cc: ravi.v.shan...@intel.com
Cc: vikas.shiva...@intel.com
Link:
http://lkml.kernel.org/r/1457652732-4499-4-git-send-email-vikas.shiva...@linux.intel.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
(back ported from commit 33c3cc7acfd95968d74247f1a4e1b0727a07ed43)
Signed-off-by: Tim Gardner <tim.gard...@canonical.com>
Conflicts:
arch/x86/kernel/cpu/common.c
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