I found find_next_best_node() was wrong.
I confirmed boot up by the following patch.
Mel-san, Kamalesh-san, could you try this?

Bye.
---

Fix decision of memoryless node in find_next_best_node().
This can be cause of SW-IOMMU's allocation failure.

This patch is for 2.6.23-rc3-mm1.

Signed-off-by: Yasunori Goto <redacted>

---
 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: current/mm/page_alloc.c
===================================================================

--- current.orig/mm/page_alloc.c	2007-08-24 16:03:17.000000000 +0900
+++ current/mm/page_alloc.c	2007-08-24 16:04:06.000000000 +0900

@@ -2136,7 +2136,7 @@ static int find_next_best_node(int node,
 		 * Note:  N_HIGH_MEMORY state not guaranteed to be
 		 *        populated yet.
 		 */
-		if (pgdat->node_present_pages)
+		if (!pgdat->node_present_pages)
 			continue;
 
 		/* Don't want a node to appear more than once */

-- 
Yasunori Goto 


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