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    SubjectRe: [PATCH] Tight check of pfn_valid on sparsemem - v4
    On Thu, 29 Jul 2010, Russell King - ARM Linux wrote:

    > And no, setting the sparse section size to 512kB doesn't work - memory is
    > offset by 256MB already, so you need a sparsemem section array of 1024
    > entries just to cover that - with the full 256MB populated, that's 512
    > unused entries followed by 512 used entries. That too is going to waste
    > memory like nobodies business.

    SPARSEMEM EXTREME does not handle that?

    Some ARMs seem to have MMUs. If so then use SPARSEMEM_VMEMMAP. You can map
    4k pages for the mmap through a page table. Redirect unused 4k blocks to
    the NULL page.

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      Last update: 2010-07-29 21:59    [W:0.020 / U:3.028 seconds]
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