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    Subject[PATCH 1/7] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA
    Date
    CONFIG_MIGRATION currently depends on CONFIG_NUMA. The current users of
    page migration such as sys_move_pages(), sys_migrate_pages() and cpuset
    process migration are ordinarily only beneficial on NUMA.

    As memory compaction will operate within a zone and is useful on both NUMA
    and non-NUMA systems, this patch allows CONFIG_MIGRATION to be set if the
    user selects CONFIG_COMPACTION as an option.

    TODO
    o After this patch is applied, the migration core is available but it
    also makes NUMA-specific features available. This is too much
    exposure so revisit this.

    Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    ---
    mm/Kconfig | 12 +++++++++++-
    1 files changed, 11 insertions(+), 1 deletions(-)

    diff --git a/mm/Kconfig b/mm/Kconfig
    index 17b8947..1d8e2b2 100644
    --- a/mm/Kconfig
    +++ b/mm/Kconfig
    @@ -168,12 +168,22 @@ config SPLIT_PTLOCK_CPUS
    default "4"

    #
    +# support for memory compaction
    +config COMPACTION
    + bool "Allow for memory compaction"
    + def_bool y
    + select MIGRATION
    + depends on EXPERIMENTAL && HUGETLBFS
    + help
    + Allows the compaction of memory for the allocation of huge pages.
    +
    +#
    # support for page migration
    #
    config MIGRATION
    bool "Page migration"
    def_bool y
    - depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE
    + depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION
    help
    Allows the migration of the physical location of pages of processes
    while the virtual addresses are not changed. This is useful for
    --
    1.6.5


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