From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754798AbZEVAOO (ORCPT ); Thu, 21 May 2009 20:14:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754232AbZEVAOA (ORCPT ); Thu, 21 May 2009 20:14:00 -0400 Received: from serv2.oss.ntt.co.jp ([222.151.198.100]:42595 "EHLO serv2.oss.ntt.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754215AbZEVAN7 (ORCPT ); Thu, 21 May 2009 20:13:59 -0400 Message-Id: <6.0.0.20.2.20090522090831.0709b9d0@172.19.0.2> X-Mailer: QUALCOMM Windows Eudora Version 6J-Jr3 Date: Fri, 22 May 2009 09:09:25 +0900 To: Andrew Morton From: Hisashi Hifumi Subject: [RESEND][PATCH] readahead:add blk_run_backing_dev Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org 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 Hi Andrew. Following patch improves sequential read performance and does not harm other performance. Please merge my patch. Comments? Thanks. #dd if=testdir/testfile of=/dev/null bs=16384 -2.6.30-rc6 1048576+0 records in 1048576+0 records out 17179869184 bytes (17 GB) copied, 224.182 seconds, 76.6 MB/s -2.6.30-rc6-patched 1048576+0 records in 1048576+0 records out 17179869184 bytes (17 GB) copied, 206.465 seconds, 83.2 MB/s Signed-off-by: Hisashi Hifumi diff -Nrup linux-2.6.30-rc6.org/mm/readahead.c linux-2.6.30-rc6.unplug/mm/readahead.c --- linux-2.6.30-rc6.org/mm/readahead.c 2009-05-18 10:46:15.000000000 +0900 +++ linux-2.6.30-rc6.unplug/mm/readahead.c 2009-05-18 13:00:42.000000000 +0900 @@ -490,5 +490,7 @@ page_cache_async_readahead(struct addres /* do read-ahead */ ondemand_readahead(mapping, ra, filp, true, offset, req_size); + + blk_run_backing_dev(mapping->backing_dev_info, NULL); } EXPORT_SYMBOL_GPL(page_cache_async_readahead);