From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751338AbVKRBDc (ORCPT ); Thu, 17 Nov 2005 20:03:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751335AbVKRBDb (ORCPT ); Thu, 17 Nov 2005 20:03:31 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:13752 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S1751330AbVKRBDO (ORCPT ); Thu, 17 Nov 2005 20:03:14 -0500 Date: Thu, 17 Nov 2005 17:03:07 -0800 (PST) From: Christoph Lameter To: akpm@osdl.org Cc: lhms-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Christoph Lameter Message-Id: <20051118010307.22328.49242.sendpatchset@schroedinger.engr.sgi.com> In-Reply-To: <20051118010257.22328.49524.sendpatchset@schroedinger.engr.sgi.com> References: <20051118010257.22328.49524.sendpatchset@schroedinger.engr.sgi.com> Subject: [PATCH 3/4] SwapMig: Drop unused pages immediately Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Drop unused pages immediately If a page is encountered that is only referenced by the migration code then there is no reason to swap or migrate the page. Release the page by calling move_to_lru(). Signed-off-by: Christoph Lameter Index: linux-2.6.15-rc1-mm1/mm/vmscan.c =================================================================== --- linux-2.6.15-rc1-mm1.orig/mm/vmscan.c 2005-11-17 15:59:07.000000000 -0800 +++ linux-2.6.15-rc1-mm1/mm/vmscan.c 2005-11-17 16:05:18.000000000 -0800 @@ -700,6 +700,11 @@ redo: list_for_each_entry_safe(page, page2, l, lru) { cond_resched(); + if (page_count(page) == 1) { + /* page was freed from under us. So we are done. */ + move_to_lru(page); + continue; + } /* * Skip locked pages during the first two passes to give the * functions holding the lock time to release the page. Later we