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    SubjectRe: [PATCH] VM routine fixes
    On Tue, Nov 09, 2004 at 01:53:06PM +0000, David Howells wrote:
    >
    > > Please don't stick CONFIG_MMU all over the place but keep them in as small
    > > as possible blocks.
    >
    > You seem to have changed your mind. Last I heard from you wanted them in as
    > few large blocks as possible. Now you want them in many small blocks. If you
    > want it changing, please feel free to supply me with a patch.

    sorry, typo. Should have read as large as possible - small doesn't make
    sense with the first half of the sentence anyway.

    > > As I told you before please move registration of MMU-only sysctls
    > > to a MMU-only file in mm/
    >
    > No. These belong in the vm_table. It doesn't seem especially straightforward
    > to do what you want. If you want it doing your way, then feel free to send
    > Andrew a patch.

    It is. You can register multiple tables for the same hierachy.

    > > this is nasty. The right thing would probably to swich !MMU arches
    > > to use the compount-page mechanism from the hugetlb code for this.
    >
    > Supply me with a patch and I'll test it. I don't know how the compound-page
    > stuff works, but it's quite possibly the wrong way to do it. There is no MMU
    > available, so you can't generate adjacency that way.

    so look at the code. It's not about the MMU at all, it's about handling
    the Linux page structures. What you're doing is a big mess and should
    not be merged. So if you want to fix the issue do it properly.

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