From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753713AbZFAAgU (ORCPT ); Sun, 31 May 2009 20:36:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752850AbZFAAgG (ORCPT ); Sun, 31 May 2009 20:36:06 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:45168 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752782AbZFAAgF (ORCPT ); Sun, 31 May 2009 20:36:05 -0400 Date: Sun, 31 May 2009 17:36:04 -0700 From: Andrew Morton To: Hisashi Hifumi Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev Message-Id: <20090531173604.8cbad7f2.akpm@linux-foundation.org> In-Reply-To: <6.0.0.20.2.20090529142527.071669e0@172.19.0.2> References: <6.0.0.20.2.20090529142527.071669e0@172.19.0.2> X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 29 May 2009 14:35:55 +0900 Hisashi Hifumi wrote: > I added blk_run_backing_dev on page_cache_async_readahead > so readahead I/O is unpluged to improve throughput on > especially RAID environment. I skipped the last version of this because KOSAKI Motohiro said "Please attach blktrace analysis ;)". I'm not sure why he asked for that, but he's a smart chap and presumably had his reasons. If you think that such an analysis is unneeded, or isn't worth the time to generate then please tell us that. But please don't just ignore the request! Thanks.