Eric Lee / smarc-fsl-linux-kernel

17 Oct, 2007

1 commit

  • 0889eba5b   x86_64: SPARSEMEM_VMEMMAP 2M page size support ... Browse Code »

    x86_64 uses 2M page table entries to map its 1-1 kernel space. We also
    implement the virtual memmap using 2M page table entries. So there is no
    additional runtime overhead over FLATMEM, initialisation is slightly more
    complex. As FLATMEM still references memory to obtain the mem_map pointer and
    SPARSEMEM_VMEMMAP uses a compile time constant, SPARSEMEM_VMEMMAP should be
    superior.

    With this SPARSEMEM becomes the most efficient way of handling virt_to_page,
    pfn_to_page and friends for UP, SMP and NUMA on x86_64.

    [apw@shadowen.org: code resplit, style fixups]
    [apw@shadowen.org: vmemmap x86_64: ensure end of section memmap is initialised]
    Signed-off-by: Christoph Lameter
    Signed-off-by: Andy Whitcroft
    Acked-by: Mel Gorman
    Cc: Andi Kleen
    Cc: KAMEZAWA Hiroyuki
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Lameter
     

11 Oct, 2007

1 commit