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page allocator: do not check NUMA node ID when the caller knows the node is valid

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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 <[email protected]>
Reviewed-by: Christoph Lameter <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Reviewed-by: Pekka Enberg <[email protected]>
Acked-by: Paul Mundt <[email protected]>	[for the SLOB NUMA bits]
Cc: Peter Zijlstra <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2009-06-16 15:31:54 -07:00 • committed by Linus Torvalds
commit 6484eb3e2a
17 changed files with 33 additions and 24 deletions
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4
mm/slob.c
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@ -46,7 +46,7 @@
* NUMA support in SLOB is fairly simplistic, pushing most of the real
* logic down to the page allocator, and simply doing the node accounting
* on the upper levels. In the event that a node id is explicitly
* provided, alloc_pages_node() with the specified node id is used
* provided, alloc_pages_exact_node() with the specified node id is used
* instead. The common case (or when the node id isn't explicitly provided)
* will default to the current node, as per numa_node_id().
*
@ -244,7 +244,7 @@ static void *slob_new_pages(gfp_t gfp, int order, int node)
#ifdef CONFIG_NUMA
if (node != -1)
page = alloc_pages_node(node, gfp, order);
page = alloc_pages_exact_node(node, gfp, order);
else
#endif
page = alloc_pages(gfp, order);