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    Subject[PATCH 0/8] v5 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 5 of the patchset include the following:

    Patch 4/8 Add mutex for add/remove of memory blocks
    - Define the mutex using DEFINE_MUTEX macro.

    Patch 8/8 Update memory-hotplug documentation
    - Add information concerning memory holes in phys_index..end_phys_index.

    Thanks,

    Nathan Fontenot


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