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authorLee Schermerhorn <lee.schermerhorn@hp.com>2009-12-14 17:58:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:13 -0800
commit4faf8d950ec438c49ae4526b897c30f8a2cad741 (patch)
tree2764787c538868e73958e176d46c542008f345c2 /Documentation/vm
parent8fe23e057172223fe2048768a4d87ab7de7477bc (diff)
downloadlinux-4faf8d950ec438c49ae4526b897c30f8a2cad741.tar.bz2
hugetlb: handle memory hot-plug events
Register per node hstate attributes only for nodes with memory. As suggested by David Rientjes. With Memory Hotplug, memory can be added to a memoryless node and a node with memory can become memoryless. Therefore, add a memory on/off-line notifier callback to [un]register a node's attributes on transition to/from memoryless state. N.B., Only tested build, boot, libhugetlbfs regression. i.e., no memory hotplug testing. Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Reviewed-by: Andi Kleen <andi@firstfloor.org> Acked-by: David Rientjes <rientjes@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Cc: Adam Litke <agl@us.ibm.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Eric Whitney <eric.whitney@hp.com> Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/vm')
-rw-r--r--Documentation/vm/hugetlbpage.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/vm/hugetlbpage.txt b/Documentation/vm/hugetlbpage.txt
index 6a8e4667ab38..bc31636973e3 100644
--- a/Documentation/vm/hugetlbpage.txt
+++ b/Documentation/vm/hugetlbpage.txt
@@ -231,7 +231,8 @@ resulting effect on persistent huge page allocation is as follows:
Per Node Hugepages Attributes
A subset of the contents of the root huge page control directory in sysfs,
-described above, has been replicated under each "node" system device in:
+described above, will be replicated under each the system device of each
+NUMA node with memory in:
/sys/devices/system/node/node[0-9]*/hugepages/