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    SubjectRe: [PATCH 0/5] Swap Migration V5: Overview
    Andrew Morton wrote:
    > Christoph Lameter <clameter@sgi.com> wrote:
    >
    >>This is a patchset intended to introduce page migration into the kernel
    >> through a simple implementation of swap based page migration.
    >> The aim is to be minimally intrusive in order to have some hopes for inclusion
    >> into 2.6.15. A separate direct page migration patch is being developed that
    >> applies on top of this patch. The direct migration patch is being discussed on
    >> <lhms-devel@lists.sourceforge.net>.
    >
    >
    > I remain concerned that it hasn't been demonstrated that the infrastructure
    > which this patch provides will be adequate for all future applications -
    > especially memory hot-remove.
    >
    > So I'll queue this up for -mm, but I think we need to see an entire
    > hot-remove implementation based on this, and have all the interested
    > parties signed up to it before we can start moving the infrastructure into
    > mainline.
    >

    It looks Christoph didn't use (direct)memory migration core in this set,
    so memory-hotremove will not be affected by this.

    At the first look, memory hotplugger will just replace swap_page()
    with migrate_onepage().

    Comparing swap-based migration and memory hotremove, memory hotremove
    has to support wider kinds of pages other than anon, file-cache
    swap-cache, mlocked() page used by direct I/O, HugeTLB pages and achieve
    close to 100% guaranntee. Ignoring the fact migration and hotremove will
    share the code, what they have to do is very different.

    swap-based approach looks just intend to do process migration and
    it itself looks not bad.

    I think your point is that hotremove and migration will share some amounts of codes.
    We are now discussing *direct* page migration and will share codes for anon pages.
    It is being discussed in -lhms. We'd like to create good one.

    Thanks,
    -- KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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