PATCH 0/6 hugetlb: numa control of persistent huge pages alloc/free Against: 2.6.31-rc7-mmotm-090827-1651 This is V6 of a series of patches to provide control over the location of the allocation and freeing of persistent huge pages on a NUMA platform. Please consider V6 [patches 1-6] for merging into mmotm. This series uses two mechanisms to constrain the nodes from which persistent huge pages are allocated: 1) the task NUMA mempolicy of the task modifying "nr_hugepages", based on a suggestion by Mel Gorman; and 2) a subset of the hugepages hstate sysfs attributes have been added [in V4] to each node system device 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 addressed review comments -- changes described in patch descriptions. V6 addresses more review comments, described in the patches. Attached to V6, I'm sending a 3 patch series that implements an enhancement suggested by David Rientjes: the default huge page nodes allowed mask will be the nodes with memory rather than all on-line nodes. The "nodes with memory" state already tracks memory/node hot-plug. Further, we will allocate per node hstate attributes only for nodes with memory. This requires that we register a memory on/off-line notifier and [un]register the attributes on transitions to/from memoryless state. Because of the interaction with memory hotplug, these 3 patches will likely require more work and testing before merging. The first six patches do not depend on these 3 and, IMO, need not wait for them. -- To unsubscribe from this list: send the line "unsubscribe linux-numa" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
