diff mbox series

[RFC,03/31] mm: migrate: Add tmpfs exchange support.

Message ID 20190215220334.29298-4-ziy@nvidia.com (mailing list archive)
State New, archived
Headers show
Series Generating physically contiguous memory after page allocation | expand

Commit Message

Zi Yan Feb. 15, 2019, 10:03 p.m. UTC 
tmpfs uses the same migrate routine as anonymous pages, enabling
exchange pages for it is easy.

Signed-off-by: Zi Yan <ziy@nvidia.com>
---
 mm/exchange.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/mm/exchange.c b/mm/exchange.c
index 8cf286fc0f10..851f1a99b48b 100644
--- a/mm/exchange.c
+++ b/mm/exchange.c
@@ -466,7 +466,10 @@  static int exchange_from_to_pages(struct page *to_page, struct page *from_page,
 		rc = exchange_page_move_mapping(to_page_mapping, from_page_mapping,
 					to_page, from_page, NULL, NULL, mode, 0, 0);
 	} else {
-		if (to_page_mapping->a_ops->migratepage == buffer_migrate_page) {
+		/* shmem */
+		if (to_page_mapping->a_ops->migratepage == migrate_page)
+			goto exchange_mappings;
+		else if (to_page_mapping->a_ops->migratepage == buffer_migrate_page) {
 
 			if (!page_has_buffers(to_page))
 				goto exchange_mappings;