[PATCH] sparsemem: record nid during memory present

Record the node id as we mark sections for instantiation.  Use this nid
during instantiation to direct allocations.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Mike Kravetz <kravetz@us.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Bob Picco <bob.picco@hp.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Martin Bligh <mbligh@google.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index e82fc1a..d6120fa 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -509,6 +509,10 @@ struct mem_section {
         * pages.  However, it is stored with some other magic.
         * (see sparse.c::sparse_init_one_section())
         *
+        * Additionally during early boot we encode node id of
+        * the location of the section here to guide allocation.
+        * (see sparse.c::memory_present())
+        *
         * Making it a UL at least makes someone do a cast
         * before using it wrong.
         */
@@ -548,6 +552,7 @@ extern int __section_nr(struct mem_section* ms);
 #define SECTION_HAS_MEM_MAP    (1UL<<1)
 #define SECTION_MAP_LAST_BIT   (1UL<<2)
 #define SECTION_MAP_MASK       (~(SECTION_MAP_LAST_BIT-1))
+#define SECTION_NID_SHIFT      2
 
 static inline struct page *__section_mem_map_addr(struct mem_section *section)
 {

diff --cc mm/sparse.c
Simple merge