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hugetlb: handle memory hot-plug events

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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>
This commit is contained in:
Lee Schermerhorn
2009-12-14 17:58:35 -08:00
committed by Linus Torvalds
parent 8fe23e0571
commit 4faf8d950e
2 changed files with 50 additions and 6 deletions
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3
Documentation/vm/hugetlbpage.txt
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@@ -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/