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hugetlb: use only nodes with memory for huge pages

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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>
This commit is contained in:
Lee Schermerhorn
2009-12-14 17:58:32 -08:00
committed by Linus Torvalds
parent 267b4c281b
commit 9b5e5d0fdc
2 changed files with 24 additions and 23 deletions
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12
Documentation/vm/hugetlbpage.txt
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@@ -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