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    hugetlb: handle updating of ACCESSED and DIRTY in hugetlb_fault() · b4d1d99f
    David Gibson 提交于
    The page fault path for normal pages, if the fault is neither a no-page
    fault nor a write-protect fault, will update the DIRTY and ACCESSED bits
    in the page table appropriately.
    
    The hugepage fault path, however, does not do this, handling only no-page
    or write-protect type faults.  It assumes that either the ACCESSED and
    DIRTY bits are irrelevant for hugepages (usually true, since they are
    never swapped) or that they are handled by the arch code.
    
    This is inconvenient for some software-loaded TLB architectures, where the
    _PAGE_ACCESSED (_PAGE_DIRTY) bits need to be set to enable read (write)
    access to the page at the TLB miss.  This could be worked around in the
    arch TLB miss code, but the TLB miss fast path can be made simple more
    easily if the hugetlb_fault() path handles this, as the normal page fault
    path does.
    Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
    Cc: William Lee Irwin III <wli@holomorphy.com>
    Cc: Hugh Dickins <hugh@veritas.com>
    Cc: Adam Litke <agl@us.ibm.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    b4d1d99f
hugetlb.c 57.7 KB