mm: numa: Change page last {nid,pid} into {cpu,pid}

Change the per page last fault tracking to use cpu,pid instead of
nid,pid. This will allow us to try and lookup the alternate task more
easily. Note that even though it is the cpu that is store in the page
flags that the mpol_misplaced decision is still based on the node.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1381141781-10992-43-git-send-email-mgorman@suse.de
[ Fixed build failure on 32-bit systems. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 025d1e3d2ad2..ff537749d3b4 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1498,7 +1498,7 @@ static struct page *alloc_misplaced_dst_page(struct page *page,
                                           __GFP_NOWARN) &
                                          ~GFP_IOFS, 0);
         if (newpage)
-                page_nidpid_xchg_last(newpage, page_nidpid_last(page));
+                page_cpupid_xchg_last(newpage, page_cpupid_last(page));
 
         return newpage;
 }
@@ -1675,7 +1675,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
         if (!new_page)
                 goto out_fail;
 
-        page_nidpid_xchg_last(new_page, page_nidpid_last(page));
+        page_cpupid_xchg_last(new_page, page_cpupid_last(page));
 
         isolated = numamigrate_isolate_page(pgdat, page);
         if (!isolated) {