[RFC 0/3] hugetlb: constrain allocation/free based on task mempolicy

[Lee Schermerhorn <lee.schermerhorn@hp.com>]

RFC 0/3 hugetlb: constrain allocation/free based on task mempolicy

Against:  25jun09 mmotm atop the "hugetlb:  balance freeing..."
series

This is V1 of a series of patches to constrain the allocation and
freeing of persistent huge pages using the task NUMA mempolicy of
the task modifying "nr_hugepages".  This series is based on Mel
Gorman's suggestion to use task mempolicy.

I have some concerns about a subtle change in behavior [see patch
2/3 and the updated documentation] and the fact that
this mechanism ignores some of the semantics of the mempolicy
mode [again, see the doc].   However, this method seems to work
fairly well.  And, IMO, the resulting code doesn't look all that
bad.

A couple of limitations in this version:

1) I haven't implemented a boot time parameter to constrain the
   boot time allocation of huge pages.  This can be added if
   anyone feels strongly that it is required.

2) I have not implemented a per node nr_overcommit_hugepages as
   David Rientjes and I discussed earlier.  Again, this can be
   added and specific nodes can be addressed using the mempolicy
   as this series does for allocation and free.

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