From: Rik van Riel The -mm tree contains the patch vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch which gives referenced pagecache pages another trip around the active list. This seems to help keep frequently accessed pagecache pages in memory. However, it means that pagecache pages that get moved to the inactive list do not have their referenced bit set, and a reference to the page will not get it moved back to the active list. This patch sets the referenced bit on pagecache pages that get deactivated, so the next access to the page will promote it back to the active list. --- mm/vmscan.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-2.6.26-rc2-mm1/mm/vmscan.c =================================================================== --- linux-2.6.26-rc2-mm1.orig/mm/vmscan.c 2008-05-28 12:11:51.000000000 -0400 +++ linux-2.6.26-rc2-mm1/mm/vmscan.c 2008-05-28 12:14:34.000000000 -0400 @@ -1062,8 +1062,13 @@ static void shrink_active_list(unsigned list_add(&page->lru, &l_inactive); pgmoved++; } - } else + } else { list_add(&page->lru, &l_inactive); + if (file && !page_mapped(page)) + /* Bypass use-once, make the next access count. + * See mark_page_accessed. */ + SetPageReferenced(page); + } } /* -- All Rights Reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/