Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756757Ab3HAT5c (ORCPT ); Thu, 1 Aug 2013 15:57:32 -0400 Received: from mga03.intel.com ([143.182.124.21]:16606 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756029Ab3HAT5b convert rfc822-to-8bit (ORCPT ); Thu, 1 Aug 2013 15:57:31 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.89,796,1367996400"; d="scan'208";a="340309660" From: "Dilger, Andreas" To: Christoph Hellwig , Xiong Zhou CC: Greg Kroah-Hartman , Peng Tao , Paul Bolle , Jiri Kosina , "linux-kernel@vger.kernel.org" , "devel@driverdev.osuosl.org" Subject: Re: [PATCH v2] staging/lustre: lloop depends on BLOCK Thread-Topic: [PATCH v2] staging/lustre: lloop depends on BLOCK Thread-Index: AQHOjLwGfTLDngp0wkGXFdutzRRQL5mAgt+AgABXF4A= Date: Thu, 1 Aug 2013 19:57:22 +0000 Message-ID: In-Reply-To: <20130801084539.GA13306@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.254.123.219] Content-Type: text/plain; charset="us-ascii" Content-ID: <0C5FFF7E63AA0842ADDEDA7225C7A1E5@intel.com> Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1065 Lines: 30 On 2013/08/01 2:45 AM, "Christoph Hellwig" wrote: >On Tue, Jul 30, 2013 at 08:29:51AM +0800, Xiong Zhou wrote: >> From: Xiong Zhou >> >> In the lustre client driver, lloop depends on BLOCK. Add an >> option for this dependence. Last version of this patch makes >> LUSTRE_FS depends on BLOCK. >> Remove unnecessary jdb head files which depends on BLOCK. > >The driver should be removed, a filesystem has no business bringing >its own loop driver. It provides significant performance improvement for network IO on Lustre. It bypasses DLM locking in Lustre and the VFS layer on the client, copying in the loop driver, and page-by-page IO submission in the normal IO path. Cheers, Andreas -- Andreas Dilger Lustre Software Architect Intel High Performance Data Division -- 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/