The patch titled
Subject: mm/page_alloc.c: refine the calculation of highest possible node id
has been added to the -mm tree. Its filename is
mm-page-refine-the-calculation-of-highest-possible-node-id.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page-refine-the-calculation-of-highest-possible-node-id.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page-refine-the-calculation-of-highest-possible-node-id.patch
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------------------------------------------------------
From: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
Subject: mm/page_alloc.c: refine the calculation of highest possible node id
nr_node_ids records the highest possible node id, which is calculated by
scanning the bitmap node_states[N_POSSIBLE]. Current implementation scan
the bitmap from the beginning, which will scan the whole bitmap.
This patch reverses the order by scanning from the end with
find_last_bit().
Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff -puN mm/page_alloc.c~mm-page-refine-the-calculation-of-highest-possible-node-id mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page-refine-the-calculation-of-highest-possible-node-id
+++ a/mm/page_alloc.c
@@ -5448,11 +5448,9 @@ void __paginginit free_area_init_node(in
*/
void __init setup_nr_node_ids(void)
{
- unsigned int node;
- unsigned int highest = 0;
+ unsigned int highest;
- for_each_node_mask(node, node_possible_map)
- highest = node;
+ highest = find_last_bit(node_possible_map.bits, MAX_NUMNODES);
nr_node_ids = highest + 1;
}
#endif
_
Patches currently in -mm which might be from weiyang@xxxxxxxxxxxxxxxxxx are
mm-memblock-warn_on-when-nid-differs-from-overlap-region.patch
mm-page-refine-the-calculation-of-highest-possible-node-id.patch
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