Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 23 Apr 2010 01:45:17 -0700 (PDT) | From | David Rientjes <> | Subject | Re: [PATCH 1/2] mm: fix bugs of mpol_rebind_nodemask() |
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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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