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    SubjectRe: [PATCH][1/2] return values shrink_dcache_memory etc
    Linus Torvalds wrote:
    > On Sat, 20 Jul 2002, Rik van Riel wrote:
    > >
    > > OK, I'll try to forward-port Ed's code to do that from 2.4 to 2.5
    > > this weekend...
    > Side note: while I absolutely think that is the right thing to do, that's
    > also the much more "interesting" change. As a result, I'd be happier if it
    > went through channels (ie probably Andrew) and had some wider testing
    > first at least in the form of a CFT on linux-kernel.

    I'd suggest that we avoid putting any additional changes into
    the VM until we have solutions available for:

    2: Make it work with pte-highmem (Bill Irwin is signed up for this)

    4: Move the pte_chains into highmem too (Bill, I guess)

    6: maybe GC the pte_chain backing pages. (Seems unavoidable. Rik?)

    Especially pte_chains in highmem. Failure to fix this well
    is a showstopper for rmap on large ia32 machines, which makes
    it a showstopper full stop.

    If we can get something in place which works acceptably on Martin
    Bligh's machines, and we can see that the gains of rmap (whatever
    they are ;)) are worth the as-yet uncoded pains then let's move on.
    But until then, adding new stuff to the VM just makes a `patch -R'
    harder to do.

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