From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id 6D64D8D003B for ; Thu, 21 Apr 2011 00:39:47 -0400 (EDT) Date: Thu, 21 Apr 2011 00:39:40 -0400 From: Christoph Hellwig Subject: Re: [PATCH 5/6] writeback: try more writeback as long as something was written Message-ID: <20110421043940.GC22423@infradead.org> References: <20110419030003.108796967@intel.com> <20110419030532.778889102@intel.com> <20110419102016.GD5257@quack.suse.cz> <20110419111601.GA18961@localhost> <20110419211008.GD9556@quack.suse.cz> <20110420075053.GB30672@localhost> <20110420152211.GC4991@quack.suse.cz> <20110421033325.GA13764@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110421033325.GA13764@localhost> Sender: owner-linux-mm@kvack.org List-ID: To: Wu Fengguang Cc: Jan Kara , Andrew Morton , Mel Gorman , Dave Chinner , Trond Myklebust , Itaru Kitayama , Minchan Kim , LKML , "linux-fsdevel@vger.kernel.org" , Linux Memory Management List On Thu, Apr 21, 2011 at 11:33:25AM +0800, Wu Fengguang wrote: > I collected the writeback_single_inode() traces (patch attached for > your reference) each for several test runs, and find much more > I_DIRTY_PAGES after patchset. Dave, do you know why there are so many > I_DIRTY_PAGES (or radix tag) remained after the XFS ->writepages() call, > even for small files? What is your defintion of a small file? As soon as it has multiple extents or holes there's absolutely no way to clean it with a single writepage call. Also XFS tries to operate as non-blocking as possible if the non-blocking flag is set in the wbc, but that flag actually seems to be dead these days. -- 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