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    SubjectRe: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19
    Kamezawa Hiroyuki wrote:
    > Ingo Molnar wrote:
    >
    >> so it's all about expectations: _could_ you reasonably remove a piece
    >> of RAM? Customer will say: "I have stopped all nonessential services,
    >> and free RAM is at 90%, still I cannot remove that piece of faulty
    >> RAM, fix the kernel!". No reasonable customer will say: "True, I have
    >> all RAM used up in mlock()ed sections, but i want to remove some RAM
    >> nevertheless".
    >>
    > Hi, I'm one of men in -lhms
    >
    > In my understanding...
    > - Memory Hotremove on IBM's LPAR? approach is
    > [remove some amount of memory from somewhere.]
    > For this approach, Mel's patch will work well.
    > But this will not guaranntee a user can remove specified range of
    > memory at any time because how memory range is used is not defined by
    > an admin
    > but by the kernel automatically. But to extract some amount of memory,
    > Mel's patch is very important and they need this.
    >
    One more consideration...
    Some cpus which support virtialization will be shipped by some vendor in near future.
    If someone uses vitualized OS, only problem is *resizing*.
    Hypervisor will be able to remap semi-physical pages anyware with hardware assistance
    but system resizing needs operating system assistance.
    To this direction, [remove some amount of memory from somewhere.] is important approach.

    -- Kame


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