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authorMel Gorman <mel@csn.ul.ie>2009-06-16 15:31:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:32 -0700
commit6484eb3e2a81807722c5f28efef94d8338b7b996 (patch)
tree10ce36f412c2ff0c7eb399af1a189f8e354f56db /arch/ia64/hp
parentb3c466ce512923298ae8c0121d3e9f397a3f1210 (diff)
downloadop-kernel-dev-6484eb3e2a81807722c5f28efef94d8338b7b996.zip
op-kernel-dev-6484eb3e2a81807722c5f28efef94d8338b7b996.tar.gz
page allocator: do not check NUMA node ID when the caller knows the node is valid
Callers of alloc_pages_node() can optionally specify -1 as a node to mean "allocate from the current node". However, a number of the callers in fast paths know for a fact their node is valid. To avoid a comparison and branch, this patch adds alloc_pages_exact_node() that only checks the nid with VM_BUG_ON(). Callers that know their node is valid are then converted. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Paul Mundt <lethal@linux-sh.org> [for the SLOB NUMA bits] Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/ia64/hp')
-rw-r--r--arch/ia64/hp/common/sba_iommu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 56ceb68..fe63b2dc9 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -1131,7 +1131,7 @@ sba_alloc_coherent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp
#ifdef CONFIG_NUMA
{
struct page *page;
- page = alloc_pages_node(ioc->node == MAX_NUMNODES ?
+ page = alloc_pages_exact_node(ioc->node == MAX_NUMNODES ?
numa_node_id() : ioc->node, flags,
get_order(size));
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