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    SubjectRe: why choose 896MB to the start point of ZONE_HIGHMEM
    On 04/06/2010 12:20 PM, Frank Hu wrote:
    >> The ELF ABI specifies that user space has 3 GB available to it. That
    >> leaves 1 GB for the kernel. The kernel, by default, uses 128 MB for I/O
    >> mapping, vmalloc, and kmap support, which leaves 896 MB for LOWMEM.
    >> All of these boundaries are configurable; with PAE enabled the user
    >> space boundary has to be on a 1 GB boundary.
    > the VM split is also configurable when building the kernel (for 32-bit
    > processors).

    I did say "all these boundaries are configurable". Rather explicitly.


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