|| ||Lee Schermerhorn <firstname.lastname@example.org> |
|| ||email@example.com, firstname.lastname@example.org |
|| ||[PATCH 0/10] hugetlb: V8 numa control of persistent huge pages alloc/free |
|| ||Thu, 01 Oct 2009 12:57:21 -0400|
|| ||<email@example.com>, Mel Gorman <firstname.lastname@example.org>,
<email@example.com>, Randy Dunlap <firstname.lastname@example.org>,
Nishanth Aravamudan <email@example.com>,
David Rientjes <firstname.lastname@example.org>,
Adam Litke <email@example.com>,
Andy Whitcroft <firstname.lastname@example.org>, <email@example.com>|
|| ||Article, Thread
PATCH 0/10 hugetlb: numa control of persistent huge pages alloc/free
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
The per node attibutes allow direct assignment of a huge page
count on a specific node, regardless of the task's mempolicy or
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.
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