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Subject[08/14] vcompound: Fallback for zone wait table
Currently vmalloc may be used for allocating zone wait table.
Use virtual compound page in order to be able to use a physically contiguous
page that can then use the large kernel TLBs.

Drawback: The zone wait table is rounded up to the next power of two which
may cost some memory.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
mm/page_alloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6.25-rc5-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.25-rc5-mm1.orig/mm/page_alloc.c 2008-03-20 20:03:50.885900600 -0700
+++ linux-2.6.25-rc5-mm1/mm/page_alloc.c 2008-03-20 20:04:43.282104684 -0700
@@ -2866,7 +2866,8 @@ int zone_wait_table_init(struct zone *zo
* To use this new node's memory, further consideration will be
* necessary.
*/
- zone->wait_table = vmalloc(alloc_size);
+ zone->wait_table = __alloc_vcompound(GFP_KERNEL,
+ get_order(alloc_size));
}
if (!zone->wait_table)
return -ENOMEM;
--


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