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    SubjectRE: [RFC PATCH 10/12] mm: add the buddy system interface
    Date
    +#ifdef CONFIG_MEMORY_MIRROR
    + if (change_to_mirror(gfp_mask, ac.high_zoneidx))
    + ac.migratetype = MIGRATE_MIRROR;
    +#endif

    We may have to be smarter than this here. I'd like to encourage the
    enterprise Linux distributions to set CONFIG_MEMORY_MIRROR=y
    But the reality is that most systems will not configure any mirrored
    memory - so we don't want the common code path for memory
    allocation to call functions that set the migrate type, try to allocate
    and then fall back to a non-mirror when that may be a complete waste
    of time.

    Maybe a global "got_mirror" that is true if we have some mirrored
    memory. Then code is

    if (got_mirror && change_to_mirror(...))


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