• Becky Bruce's avatar
    powerpc: Hugetlb for BookE · 41151e77
    Becky Bruce authored
    Enable hugepages on Freescale BookE processors.  This allows the kernel to
    use huge TLB entries to map pages, which can greatly reduce the number of
    TLB misses and the amount of TLB thrashing experienced by applications with
    large memory footprints.  Care should be taken when using this on FSL
    processors, as the number of large TLB entries supported by the core is low
    (16-64) on current processors.
    
    The supported set of hugepage sizes include 4m, 16m, 64m, 256m, and 1g.
    Page sizes larger than the max zone size are called "gigantic" pages and
    must be allocated on the command line (and cannot be deallocated).
    
    This is currently only fully implemented for Freescale 32-bit BookE
    processors, but there is some infrastructure in the code for
    64-bit BooKE.
    Signed-off-by: default avatarBecky Bruce <beckyb@kernel.crashing.org>
    Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    41151e77
mmu.h 6.11 KB