From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 14 Mar 2006 19:05:33 -0800 (PST) From: Christoph Lameter Subject: page migration: Fail with error if swap not setup Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: akpm@osdl.org Cc: linux-mm@kvack.org List-ID: Currently the migration of anonymous pages will silently fail if no swap is setup. This patch makes page migration functions check for available swap and fail with -ENODEV if no swap space is available. Signed-off-by: Christoph Lameter Index: linux-2.6.16-rc6/mm/mempolicy.c =================================================================== --- linux-2.6.16-rc6.orig/mm/mempolicy.c 2006-03-14 16:31:15.000000000 -0800 +++ linux-2.6.16-rc6/mm/mempolicy.c 2006-03-14 17:25:09.000000000 -0800 @@ -330,9 +330,14 @@ check_range(struct mm_struct *mm, unsign int err; struct vm_area_struct *first, *vma, *prev; - /* Clear the LRU lists so pages can be isolated */ - if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) + if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { + /* Must have available swap entries for migration */ + if (nr_swap_pages <=0) + return ERR_PTR(-ENODEV); + + /* Clear the LRU lists so pages can be isolated */ lru_add_drain_all(); + } first = find_vma(mm, start); if (!first) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org