[PATCH] swapout fix

Silly bug which was halving swapout bandwidth: we've taken a copy of
page->mapping into a local convenience variable, but forgot to update
that local after adding the page to swapcache.

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 91d66383509ef1a5bf3aec056c0fcf1f8928d150..def7ba08008738688117d218346a4fccd73af8ae 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -145,6 +145,7 @@ shrink_list(struct list_head *page_list, int nr_pages,
                        if (!add_to_swap(page))
                                goto activate_locked;
                        pte_chain_lock(page);
+                       mapping = page->mapping;
                }
 
                /*