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-rw-r--r--mm/page_isolation.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 0cee10ffb98d..d1473b2e9481 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -6,6 +6,7 @@
#include <linux/page-isolation.h>
#include <linux/pageblock-flags.h>
#include <linux/memory.h>
+#include <linux/hugetlb.h>
#include "internal.h"
int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages)
@@ -252,6 +253,19 @@ struct page *alloc_migrate_target(struct page *page, unsigned long private,
{
gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;
+ /*
+ * TODO: allocate a destination hugepage from a nearest neighbor node,
+ * accordance with memory policy of the user process if possible. For
+ * now as a simple work-around, we use the next node for destination.
+ */
+ if (PageHuge(page)) {
+ nodemask_t src = nodemask_of_node(page_to_nid(page));
+ nodemask_t dst;
+ nodes_complement(dst, src);
+ return alloc_huge_page_node(page_hstate(compound_head(page)),
+ next_node(page_to_nid(page), dst));
+ }
+
if (PageHighMem(page))
gfp_mask |= __GFP_HIGHMEM;
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