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    SubjectRe: [PATCH 2 of 4] hotplug-memory: adding non-section-aligned memory is bad
    On Thu, 27 Mar 2008 19:51:26 -0700
    Jeremy Fitzhardinge <> wrote:

    > > (I wrote online_page() in above, but online_pages() is maybe better.
    > > It does all what you want.)
    > >
    > No, for my use-case the pages must be onlined one by one as they get
    > some physical memory assigned to them. At the time I do add_memory(),
    > I'm just allocating page structures, but there's no memory backing that
    > range.
    yes, I see.

    > That's why I need to disable the sysfs onlining interface, because it
    > bulk onlines the pages before there's anything behind them.

    My point is. online_pages() does following things.

    - call notifier
    - update information , total_pages etc...
    - re-configure zonelist if necessary...

    But online_page() not. Hmm...

    How about capturing online_page() by balloon ?
    call add_memory() to create mem_map
    call online_pages() against the whole section. <=== call this without sysfs.
    online_pages() do misc. jobs
    call online_page() one by one (arch dependent) called by walk_memory_resource.
    online_page() will finally call free_page(page).
    <=========== Xen capture here.
    Don't free onlined page and swallow them into baloon driver.


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