Issue

• Backport Intel Cache QoS Monitoring support in perf

$ git show 4afbb24 | head -n 29
commit 4afbb24ce5e723c8a093a6674a3c33062175078a
Author: Matt Fleming <matt.fleming@intel.com>
Date:   Fri Jan 23 18:45:44 2015 +0000

    perf/x86/intel: Add Intel Cache QoS Monitoring support

    Future Intel Xeon processors support a Cache QoS Monitoring feature that
    allows tracking of the LLC occupancy for a task or task group, i.e. the
    amount of data in pulled into the LLC for the task (group).

    Currently the PMU only supports per-cpu events. We create an event for
    each cpu and read out all the LLC occupancy values.

    Because this results in duplicate values being written out to userspace,
    we also export a .per-pkg event file so that the perf tools only
    accumulate values for one cpu per package.

    Signed-off-by: Matt Fleming <matt.fleming@intel.com>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Kanaka Juvva <kanaka.d.juvva@intel.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
    Link: http://lkml.kernel.org/r/1422038748-21397-6-git-send-email-matt@codeblueprint.co.uk
    Signed-off-by: Ingo Molnar <mingo@kernel.org>

$ git describe --contains 4afbb24
v4.1-rc3~23^2~62^2~6

$ git tag --contains 4afbb24
v4.1
v4.1-rc1
v4.1-rc2
v4.1-rc3
v4.1-rc4
v4.1-rc5
v4.1-rc6
v4.1-rc7
v4.1-rc8
v4.2-rc1
v4.2-rc2
v4.2-rc3