Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754316Ab0DZCpa (ORCPT ); Sun, 25 Apr 2010 22:45:30 -0400 Received: from THUNK.ORG ([69.25.196.29]:49534 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752697Ab0DZCp3 (ORCPT ); Sun, 25 Apr 2010 22:45:29 -0400 Date: Sun, 25 Apr 2010 22:45:27 -0400 From: tytso@mit.edu To: Dave Chinner , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com Subject: Re: [PATCH 3/4] writeback: pay attention to wbc->nr_to_write in write_cache_pages Message-ID: <20100426024527.GD13043@thunk.org> Mail-Followup-To: tytso@mit.edu, Dave Chinner , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com References: <1271731314-5893-1-git-send-email-david@fromorbit.com> <1271731314-5893-4-git-send-email-david@fromorbit.com> <20100425033315.GC667@thunk.org> <20100426014908.GD11437@dastard> <20100426024302.GC13043@thunk.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100426024302.GC13043@thunk.org> User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on thunker.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 840 Lines: 20 On Sun, Apr 25, 2010 at 10:43:02PM -0400, tytso@MIT.EDU wrote: > Have you tested with multiple files that are subject to writeout at > the same time? After all, if your I/O allocator does a great job of > keeping the files contiguous in chunks larger tham 4MB, then if you > have two or more files that need to be written out, the page allocator > will round robin between the two files in 4MB chunks, and that might > not be considered an ideal I/O pattern. Argh. Sorry for not proof reading better before hitting the send key.... s/tham/than/ s/page allocator/writeback code/ - Ted -- 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/