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    Subject[PATCH 0/9] v4 De-couple sysfs memory directories from memory sections
    This set of patches de-couples the idea that there is a single
    directory in sysfs for each memory section. The intent of the
    patches is to reduce the number of sysfs directories created to
    resolve a boot-time performance issue. On very large systems
    boot time are getting very long (as seen on powerpc hardware)
    due to the enormous number of sysfs directories being created.
    On a system with 1 TB of memory we create ~63,000 directories.
    For even larger systems boot times are being measured in hours.

    This set of patches allows for each directory created in sysfs
    to cover more than one memory section. The default behavior for
    sysfs directory creation is the same, in that each directory
    represents a single memory section. A new file 'end_phys_index'
    in each directory contains the physical_id of the last memory
    section covered by the directory so that users can easily
    determine the memory section range of a directory.

    Updates for version 4 of the patchset includes an additional
    patch [4/9] that introduces a new mutex to be taken for any
    add or remove (not hotplug) of memory. The following updates
    are also included.

    Patch 2/9 Add new phys_index properties
    - The start_phys_index property was reverted to the original
    phys_index name.

    Patch 3/9 Add section count to memory_block
    - Use atomic_dec_and_test()

    Patch 7/9 Update the node sysfs code
    - Update the inline definition of unregister_mem_sects_under_nodes
    for !CONFIG_NUMA builds.

    Patch 8/9 Define memory_block_size_bytes() for ppc/pseries
    - Use an unsigned long for getting property value.

    Patch 9/9 Update memory-hotplug documentation
    - Minor updates for reversion of phys_index property name.


    Nathan Fontenot

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