PATCH 0/10 hugetlb: numa control of persistent huge pages alloc/free Against: 2.6.31-mmotm-090925-1435 This is V8 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 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 a new sysctl "nr_hugepages_mempolicy", 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 addressed more review comments, described in the patches. V6 also included 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 and 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. V7 addressed review comments, described in the patches, and included a new patch, originally from Mel Gorman, to define a new vm sysctl and sysfs global hugepages attribute "nr_hugepages_mempolicy" rather than apply mempolicy contraints to pool adujstments via the pre-existing "nr_hugepages". The 3 patches to restrict hugetlb to visiting only nodes with memory and to add/remove per node hstate attributes on memory hotplug completed V7. V8 reorganizes the sysctl and sysfs attribute handlers to default the nodes to default or define the nodes_allowed mask up in the handlers and pass nodes_allowed [pointer] to set_max_huge_pages(). This cleanup was suggested by David Rientjes. V8 also merges Mel Gorman's "nr_hugepages_mempolicy" back into the patch to compute nodes_allowed from mempolicy. -- 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
