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    SubjectRe: [PATCH 1/2] mm: fix bugs of mpol_rebind_nodemask()
    On Fri, 23 Apr 2010, Miao Xie wrote:

    > Suppose the current mempolicy nodes is 0-2, we can remap it from 0-2 to 2,
    > then we can remap it from 2 to 1, but we can't remap it from 2 to 0-2.
    >
    > that is to say it can't be remaped to a large set of allowed nodes, and the task
    > just can use the small set of nodes for ever, even the large set of nodes is allowed,
    > I think it is unreasonable.
    >

    That's been the behavior for at least three years so changing it from
    under the applications isn't acceptable, see
    Documentation/vm/numa_memory_policy.txt regarding mempolicy rebinds and
    the two flags that are defined that can be used to adjust the behavior.

    The pol->v.nodes = nodes_empty(tmp) ? *nodes : tmp fix is welcome,
    however, as a standalone patch.


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