|| ||Lee Schermerhorn <email@example.com> |
|| ||firstname.lastname@example.org,email@example.com |
|| ||[PATCH 0/12] hugetlb: V10 numa control of persistent huge pages alloc/free |
|| ||Thu, 08 Oct 2009 12:24:54 -0400|
|| ||<firstname.lastname@example.org>,Mel Gorman <email@example.com>,Randy Dunlap <firstname.lastname@example.org>,Nishanth Aravamudan <email@example.com>,firstname.lastname@example.org,David Rientjes <email@example.com>,Adam Litke <firstname.lastname@example.org>,Andy Whitcroft <email@example.com>,<firstname.lastname@example.org>|
|| ||Article, Thread
PATCH 0/12 hugetlb: numa control of persistent huge pages alloc/free
This is V10 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 reorganized 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 merged Mel
Gorman's "nr_hugepages_mempolicy" back into the patch to compute
nodes_allowed from mempolicy.
V8 turned out to be too large a reorg to pull off without botching
something. V9 attempted to fix these. In the meantime, David Rientjes
had posted a patch to generalize NODEMASK_ALLOC. This cause a build
error in the series. David provided a patch to fix the build failure.
David's fixup patch was included in V9. This caused V9 to depend
on David's patch.
V10 addresses more review comments and folds the patch to accomodate
David R's rework of NODEMASK_ALLOC into the preceeding patch so that
the patch will build cleanly. David's "make NODEMASK_ALLOC more general"
patch has been added to this series, along with another patch from
David to fix a problem with memory hotplug that this series depends
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