mm: defer flush of writable TLB entries

[cascardo/linux.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 99ec00d..b113903 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1098,7 +1098,12 @@ static unsigned long shrink_page_list(struct list_head *page_list,
                        if (!sc->may_writepage)
                                goto keep_locked;
 
-                       /* Page is dirty, try to write it out here */
+                       /*
+                        * Page is dirty. Flush the TLB if a writable entry
+                        * potentially exists to avoid CPU writes after IO
+                        * starts and then write it out here.
+                        */
+                       try_to_unmap_flush_dirty();
                        switch (pageout(page, mapping, sc)) {
                        case PAGE_KEEP:
                                goto keep_locked;