From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p73BbMQF150590 for ; Wed, 3 Aug 2011 06:37:23 -0500 Received: from mx1.redhat.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 6E42B1E6F804 for ; Wed, 3 Aug 2011 04:37:21 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by cuda.sgi.com with ESMTP id Tm8s31Xj1x6Ohxt9 for ; Wed, 03 Aug 2011 04:37:21 -0700 (PDT) Date: Wed, 3 Aug 2011 13:37:06 +0200 From: Johannes Weiner Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd Message-ID: <20110803113706.GF27199@redhat.com> References: <1311265730-5324-1-git-send-email-mgorman@suse.de> <1311265730-5324-9-git-send-email-mgorman@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1311265730-5324-9-git-send-email-mgorman@suse.de> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Mel Gorman Cc: Rik van Riel , Jan Kara , LKML , XFS , Christoph Hellwig , Linux-MM , Minchan Kim , Wu Fengguang On Thu, Jul 21, 2011 at 05:28:50PM +0100, Mel Gorman wrote: > Assuming that flusher threads will always write back dirty pages promptly > then it is always faster for reclaimers to wait for flushers. This patch > prevents kswapd writing back any filesystem pages. > > Signed-off-by: Mel Gorman Relying on the flushers may mean that every dirty page in the system has to be written back before the pages from the zone of interest are clean. De-facto we have only one mechanism to stay on top of the dirty pages from a per-zone perspective, and that is single-page writeout from reclaim. While we all agree that this sucks, we can not remove it unless we have a replacement that makes zones reclaimable in a reasonable time frame (or keep them reclaimable in the first place, what per-zone dirty limits attempt to do). As such, please include Nacked-by: Johannes Weiner _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754005Ab1HCLhj (ORCPT ); Wed, 3 Aug 2011 07:37:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57404 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753971Ab1HCLhe (ORCPT ); Wed, 3 Aug 2011 07:37:34 -0400 Date: Wed, 3 Aug 2011 13:37:06 +0200 From: Johannes Weiner To: Mel Gorman Cc: Linux-MM , LKML , XFS , Dave Chinner , Christoph Hellwig , Wu Fengguang , Jan Kara , Rik van Riel , Minchan Kim Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd Message-ID: <20110803113706.GF27199@redhat.com> References: <1311265730-5324-1-git-send-email-mgorman@suse.de> <1311265730-5324-9-git-send-email-mgorman@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1311265730-5324-9-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 21, 2011 at 05:28:50PM +0100, Mel Gorman wrote: > Assuming that flusher threads will always write back dirty pages promptly > then it is always faster for reclaimers to wait for flushers. This patch > prevents kswapd writing back any filesystem pages. > > Signed-off-by: Mel Gorman Relying on the flushers may mean that every dirty page in the system has to be written back before the pages from the zone of interest are clean. De-facto we have only one mechanism to stay on top of the dirty pages from a per-zone perspective, and that is single-page writeout from reclaim. While we all agree that this sucks, we can not remove it unless we have a replacement that makes zones reclaimable in a reasonable time frame (or keep them reclaimable in the first place, what per-zone dirty limits attempt to do). As such, please include Nacked-by: Johannes Weiner From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta8.messagelabs.com (mail6.bemta8.messagelabs.com [216.82.243.55]) by kanga.kvack.org (Postfix) with ESMTP id 286546B0169 for ; Wed, 3 Aug 2011 07:37:21 -0400 (EDT) Date: Wed, 3 Aug 2011 13:37:06 +0200 From: Johannes Weiner Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd Message-ID: <20110803113706.GF27199@redhat.com> References: <1311265730-5324-1-git-send-email-mgorman@suse.de> <1311265730-5324-9-git-send-email-mgorman@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1311265730-5324-9-git-send-email-mgorman@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Linux-MM , LKML , XFS , Dave Chinner , Christoph Hellwig , Wu Fengguang , Jan Kara , Rik van Riel , Minchan Kim On Thu, Jul 21, 2011 at 05:28:50PM +0100, Mel Gorman wrote: > Assuming that flusher threads will always write back dirty pages promptly > then it is always faster for reclaimers to wait for flushers. This patch > prevents kswapd writing back any filesystem pages. > > Signed-off-by: Mel Gorman Relying on the flushers may mean that every dirty page in the system has to be written back before the pages from the zone of interest are clean. De-facto we have only one mechanism to stay on top of the dirty pages from a per-zone perspective, and that is single-page writeout from reclaim. While we all agree that this sucks, we can not remove it unless we have a replacement that makes zones reclaimable in a reasonable time frame (or keep them reclaimable in the first place, what per-zone dirty limits attempt to do). As such, please include Nacked-by: Johannes Weiner -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org