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-rw-r--r--mm/migrate.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 003886606a22..337a40201c82 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1987,6 +1987,13 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
goto out;
/*
+ * Also do not migrate dirty pages as not all filesystems can move
+ * dirty pages in MIGRATE_ASYNC mode which is a waste of cycles.
+ */
+ if (page_is_file_cache(page) && PageDirty(page))
+ goto out;
+
+ /*
* Rate-limit the amount of data that is being migrated to a node.
* Optimal placement is no good if the memory bus is saturated and
* all the time is being spent migrating!