• Mel Gorman's avatar
    mm: add get_kernel_page[s] for pinning of kernel addresses for I/O · 18022c5d
    Mel Gorman authored
    This patch adds two new APIs get_kernel_pages() and get_kernel_page() that
    may be used to pin a vector of kernel addresses for IO.  The initial user
    is expected to be NFS for allowing pages to be written to swap using
    aops->direct_IO().  Strictly speaking, swap-over-NFS only needs to pin one
    page for IO but it makes sense to express the API in terms of a vector and
    add a helper for pinning single pages.
    Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
    Reviewed-by: default avatarRik van Riel <riel@redhat.com>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: David S. Miller <davem@davemloft.net>
    Cc: Eric B Munson <emunson@mgebm.net>
    Cc: Eric Paris <eparis@redhat.com>
    Cc: James Morris <jmorris@namei.org>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: Mike Christie <michaelc@cs.wisc.edu>
    Cc: Neil Brown <neilb@suse.de>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
    Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
    Cc: Xiaotian Feng <dfeng@redhat.com>
    Cc: Mark Salter <msalter@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    18022c5d
swap.c 22.7 KB