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    Subject[RFC 0/4] Add perf interface to expose nvdimm performance stats
    Date
    Patchset adds performance stats reporting support for nvdimm.
    Added interface includes support for a pmu register function and
    callbacks to be used by arch/platform specific drivers.
    User could use standard perf tool to access perf events exposed via pmu.

    Patchset adds a structure called nvdimm_pmu which can
    be used to add platform specific data like supported event list and
    callbacks to pmu functions like event_init/add/delete/read.

    Patchset includes an implements the to expose IBM pseries platform nmem*
    device performance stats using this interface.

    Result from power9 pseries lpar with 2 nvdimm device:
    command:# perf list nmem
    nmem0/cchrhcnt/ [Kernel PMU event]
    nmem0/cchwhcnt/ [Kernel PMU event]
    nmem0/critrscu/ [Kernel PMU event]
    nmem0/ctlresct/ [Kernel PMU event]
    nmem0/ctlrestm/ [Kernel PMU event]
    nmem0/fastwcnt/ [Kernel PMU event]
    nmem0/hostlcnt/ [Kernel PMU event]
    nmem0/hostldur/ [Kernel PMU event]
    nmem0/hostscnt/ [Kernel PMU event]
    nmem0/hostsdur/ [Kernel PMU event]
    nmem0/medrcnt/ [Kernel PMU event]
    nmem0/medrdur/ [Kernel PMU event]
    nmem0/medwcnt/ [Kernel PMU event]
    nmem0/medwdur/ [Kernel PMU event]
    nmem0/memlife/ [Kernel PMU event]
    nmem0/noopstat/ [Kernel PMU event]
    nmem0/ponsecs/ [Kernel PMU event]
    nmem1/cchrhcnt/ [Kernel PMU event]
    nmem1/cchwhcnt/ [Kernel PMU event]
    nmem1/critrscu/ [Kernel PMU event]
    ...
    nmem1/noopstat/ [Kernel PMU event]
    nmem1/ponsecs/ [Kernel PMU event]

    Patch1:
    Introduces the nvdimm_pmu structure, common function for pmu
    register along with callback routine check.
    Pacth2
    Add code in arch/powerpc/platform/pseries/papr_scm.c to expose
    nmem* pmu. It fills in the nvdimm_pmu structure with event attrs
    and event callback functions and then registers the pmu by adding
    callback to register_nvdimm_pmu.
    Patch3:
    Sysfs documentation patch
    Patch4:
    Adds cpuhotplug support.

    Kajol Jain (4):
    drivers/nvdimm: Add perf interface to expose nvdimm performance stats
    powerpc/papr_scm: Add perf interface support
    powerpc/papr_scm: Document papr_scm sysfs event format entries
    powerpc/papr_scm: Add cpu hotplug support for nvdimm pmu device

    Documentation/ABI/testing/sysfs-bus-papr-pmem | 31 ++
    arch/powerpc/include/asm/device.h | 5 +
    arch/powerpc/platforms/pseries/papr_scm.c | 346 +++++++++++++++++-
    drivers/nvdimm/Makefile | 1 +
    drivers/nvdimm/nd_perf.c | 111 ++++++
    include/linux/nd.h | 31 ++
    6 files changed, 524 insertions(+), 1 deletion(-)
    create mode 100644 drivers/nvdimm/nd_perf.c

    --
    2.27.0

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