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    SubjectRe: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework
    On Thu, 26 Aug 2010 02:58:57 +0200, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
    > Hmm, you may not like this..but how about following kind of interface ?
    >
    > Now, memoyr hotplug supports following operation to free and _isolate_
    > memory region.
    > # echo offline > /sys/devices/system/memory/memoryX/state
    >
    > Then, a region of memory will be isolated. (This succeeds if there are free
    > memory.)
    >
    > Add a new interface.
    >
    > % echo offline > /sys/devices/system/memory/memoryX/state
    > # extract memory from System RAM and make them invisible from buddy allocator.
    >
    > % echo cma > /sys/devices/system/memory/memoryX/state
    > # move invisible memory to cma.

    At this point I need to say that I have no experience with hotplug memory but
    I think that for this to make sense the regions of memory would have to be
    smaller. Unless I'm misunderstanding something, the above would convert
    a region of sizes in order of GiBs to use for CMA.

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    Best regards, _ _
    | Humble Liege of Serenely Enlightened Majesty of o' \,=./ `o
    | Computer Science, Michał "mina86" Nazarewicz (o o)
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