mm: vmscan: do not writeback filesystem pages in direct reclaim

[pandora-kernel.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d29b2bd..10f9c59 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -865,6 +865,15 @@ static unsigned long shrink_page_list(struct list_head *page_list,
                if (PageDirty(page)) {
                        nr_dirty++;
 
+                       /*
+                        * Only kswapd can writeback filesystem pages to
+                        * avoid risk of stack overflow
+                        */
+                       if (page_is_file_cache(page) && !current_is_kswapd()) {
+                               inc_zone_page_state(page, NR_VMSCAN_WRITE_SKIP);
+                               goto keep_locked;
+                       }
+
                        if (references == PAGEREF_RECLAIM_CLEAN)
                                goto keep_locked;
                        if (!may_enter_fs)