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    SubjectRe: [PATCH RFC] hotplug-memory: refactor online_pages to separate zone growth from page onlining
    On Wed, 02 Apr 2008 15:13:05 -0700
    Jeremy Fitzhardinge <jeremy@goop.org> wrote:
    > > Yeah, but I'm just talking about hotplugged memory. When we add it, we
    > > don't have to map the added pages (since they're highmem) and don't have
    > > to touch their contents and zero them out, either. Then, the balloon
    > > driver can notice that the memory is too large, and start to balloon it
    > > down.
    > >
    >
    > I didn't think x86-64 had a notion of highmem.
    >
    > How do you prevent the pages from being used before they're ballooned out?
    >

    As I mentioned before, you can do that by plug online_page().

    Now, online_page() is per-architecture. So, it's not so bad to make this
    online_page() to be just a callback.
    =
    int online_page(struct page *page)
    {
    if (online_page_callback)
    return (*online_page_callback)(struct page *page);
    retrun arch_default_online_page(page);
    }
    =
    maybe not so dirty look.

    your ballon driver can overwrite this callback pointer.

    Thanks,
    -Kame



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