There is a race condition between swap-in and unmap_and_move().
When swap-in occur, page_mapped might be not set yet.
So, unmap_and_move() gives up at once, and tries later.
Signed-off-by: Yasunori Goto <[email protected]>
mm/migrate.c | 5 +++++
1 files changed, 5 insertions(+)
Index: current_test/mm/migrate.c
===================================================================
--- current_test.orig/mm/migrate.c 2007-05-08 15:08:09.000000000 +0900
+++ current_test/mm/migrate.c 2007-05-08 15:08:09.000000000 +0900
@@ -670,6 +670,11 @@ static int unmap_and_move(new_page_t get
/* hold this anon_vma until remove_migration_ptes() finishes */
anon_vma_hold(page);
}
+
+ if (PageSwapCache(page) && !page_mapped(page))
+ /* swap in now. try lator*/
+ goto unlock;
+
/*
* Establish migration ptes or remove ptes
*/
--
Yasunori Goto
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