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>
diff --git a/mm/mmzone.c b/mm/mmzone.c
index 25bb477..bf34fb8 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -97,20 +97,20 @@
INIT_LIST_HEAD(&lruvec->lists[lru]);
}
-#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_NIDPID_NOT_IN_PAGE_FLAGS)
-int page_nidpid_xchg_last(struct page *page, int nidpid)
+#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)
+int page_cpupid_xchg_last(struct page *page, int cpupid)
{
unsigned long old_flags, flags;
- int last_nidpid;
+ int last_cpupid;
do {
old_flags = flags = page->flags;
- last_nidpid = page_nidpid_last(page);
+ last_cpupid = page_cpupid_last(page);
- flags &= ~(LAST_NIDPID_MASK << LAST_NIDPID_PGSHIFT);
- flags |= (nidpid & LAST_NIDPID_MASK) << LAST_NIDPID_PGSHIFT;
+ flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
+ flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
} while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));
- return last_nidpid;
+ return last_cpupid;
}
#endif