• Chen, Kenneth W's avatar
    [PATCH] tightening hugetlb strict accounting · a43a8c39
    Chen, Kenneth W authored
    
    
    Current hugetlb strict accounting for shared mapping always assume mapping
    starts at zero file offset and reserves pages between zero and size of the
    file.  This assumption often reserves (or lock down) a lot more pages then
    necessary if application maps at none zero file offset.  libhugetlbfs is
    one example that requires proper reservation on shared mapping starts at
    none zero offset.
    
    This patch extends the reservation and hugetlb strict accounting to support
    any arbitrary pair of (offset, len), resulting a much more robust and
    accurate scheme.  More importantly, it won't lock down any hugetlb pages
    outside file mapping.
    Signed-off-by: default avatarKen Chen <kenneth.w.chen@intel.com>
    Acked-by: default avatarAdam Litke <agl@us.ibm.com>
    Cc: David Gibson <david@gibson.dropbear.id.au>
    Cc: William Lee Irwin III <wli@holomorphy.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    a43a8c39
hugetlb.h 5.45 KB