hugetlb: use only nodes with memory for huge pages

Register per node hstate sysfs attributes only for nodes with memory.
Global replacement of 'all online nodes" with "all nodes with memory" in
mm/hugetlb.c.  Suggested by David Rientjes.

A subsequent patch will handle adding/removing of per node hstate sysfs
attributes when nodes transition to/from memoryless state via memory
hotplug.

NOTE: this patch has not been tested with memoryless nodes.

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Reviewed-by: Andi Kleen <andi@firstfloor.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>
Acked-by: David Rientjes <rientjes@google.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>

1 files changed, 6 insertions, 6 deletions

diff --git a/Documentation/vm/hugetlbpage.txt b/Documentation/vm/hugetlbpage.txt
index 01c3108..6a8e466 100644
--- a/Documentation/vm/hugetlbpage.txt
+++ b/Documentation/vm/hugetlbpage.txt
@@ -90,11 +90,11 @@ huge page pool to 20, allocating or freeing huge pages, as required.
 On a NUMA platform, the kernel will attempt to distribute the huge page pool
 over all the set of allowed nodes specified by the NUMA memory policy of the
 task that modifies nr_hugepages.  The default for the allowed nodes--when the
-task has default memory policy--is all on-line nodes.  Allowed nodes with
-insufficient available, contiguous memory for a huge page will be silently
-skipped when allocating persistent huge pages.  See the discussion below of
-the interaction of task memory policy, cpusets and per node attributes with
-the allocation and freeing of persistent huge pages.
+task has default memory policy--is all on-line nodes with memory.  Allowed
+nodes with insufficient available, contiguous memory for a huge page will be
+silently skipped when allocating persistent huge pages.  See the discussion
+below of the interaction of task memory policy, cpusets and per node attributes
+with the allocation and freeing of persistent huge pages.
 
 The success or failure of huge page allocation depends on the amount of
 physically contiguous memory that is present in system at the time of the
@@ -226,7 +226,7 @@ resulting effect on persistent huge page allocation is as follows:
    without first moving to a cpuset that contains all of the desired nodes.
 
 5) Boot-time huge page allocation attempts to distribute the requested number
-   of huge pages over all on-lines nodes.
+   of huge pages over all on-lines nodes with memory.
 
 Per Node Hugepages Attributes