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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>