• Paul Jackson's avatar
    [PATCH] cpusets: bitmap and mask remap operators · fb5eeeee
    Paul Jackson authored
    In the forthcoming task migration support, a key calculation will be
    mapping cpu and node numbers from the old set to the new set while
    preserving cpuset-relative offset.
    For example, if a task and its pages on nodes 8-11 are being migrated to
    nodes 24-27, then pages on node 9 (the 2nd node in the old set) should be
    moved to node 25 (the 2nd node in the new set.)
    As with other bitmap operations, the proper way to code this is to provide
    the underlying calculation in lib/bitmap.c, and then to provide the usual
    cpumask and nodemask wrappers.
    This patch provides that.  These operations are termed 'remap' operations.
    Both remapping a single bit and a set of bits is supported.
    Signed-off-by: default avatarPaul Jackson <pj@sgi.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>