[PATCH 0/6] hugetlb: V5 constrain allocation/free based on task mempolicy

Lee Schermerhorn
2009-08-28T16:03:14Z

PATCH 0/6 hugetlb: numa control of persistent huge pages alloc/free

Against: 2.6.31-rc7-mmotm-090827-0057

This is V5 of a series of patches to provide control over the location
of the allocation and freeing of persistent huge pages on a NUMA
platform.

This series uses the task NUMA mempolicy of the task modifying
"nr_hugepages" to constrain the affected nodes. This method is
based on Mel Gorman's suggestion to use task mempolicy. One of
the benefits of this method is that it does not *require*
modification to hugeadm(8) to use this feature. One of the possible
downsides is that task mempolicy is limited by cpuset constraints.

V4 added a subset of the hugepages sysfs attributes to each per
node system device directory under:

/sys/devices/node/node[0-9]*/hugepages.

The per node attibutes allow direct assignment of a huge page
count on a specific node, regardless of the task's mempolicy or
cpuset constraints.

V5 addresses review comments -- changes described in patch
descriptions. Should be almost ready for -mm?

Note, 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.