Re: [PATCH] CPU hot swap for 2.4.3 + s390 support

From: Chris Wedgwood (cw@f00f.org)
Date: Sat May 05 2001 - 20:53:22 EST


On Sat, May 05, 2001 at 11:34:16AM -0500, Mitch Adair wrote:

    Wouldn't that be lot of the same issues as a "swapoff" with some
    portion of that in use? (except for the kernel data case of
    course...)

No. Swapoff makes pages allocated to userland applications in swap
move back into main memory -- this is much easier because:

   - the pages are on disk, we _know_ the aren't locked my mlock or
     pinned for IO (kiobufs, whatever)

   - there are no kernel pages/buffers in this area, even harder than
     the above to deal with

  --cw

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