Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757992Ab0GVTQm (ORCPT ); Thu, 22 Jul 2010 15:16:42 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:35493 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756941Ab0GVTQi (ORCPT ); Thu, 22 Jul 2010 15:16:38 -0400 Date: Thu, 22 Jul 2010 12:15:41 -0700 From: Joel Becker To: Matthew Wilcox Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Filesystem hints to storage Message-ID: <20100722191541.GA12376@mail.oracle.com> Mail-Followup-To: Matthew Wilcox , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org References: <20100722180854.GB22009@parisc-linux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100722180854.GB22009@parisc-linux.org> X-Burt-Line: Trees are cool. X-Red-Smith: Ninety feet between bases is perhaps as close as man has ever come to perfection. User-Agent: Mutt/1.5.20 (2009-06-14) X-Source-IP: acsmt355.oracle.com [141.146.40.155] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090207.4C489914.0010:SCFMA4539814,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1371 Lines: 36 On Thu, Jul 22, 2010 at 12:08:54PM -0600, Matthew Wilcox wrote: > For Enterprise NVMHCI, the working group is looking at refining these > hints. Are there any hints that people would like to see added or > removed from the list in NVMHCI 1.0? > > I think there are some hints that are hard for the filesystem to know > itself, never mind pass down, so it'd be good to remove them to reduce > the complexity. Contrariwise, there are some hints I think the filesystem > could pass down that aren't in the spec today, such as the flags from > madvise (random access vs sequential access) and whether the access is > for fs metadata or application data. If we're looking at the filesystem interface to all of this, I would think these hints could be used by non-SSD storage as well. Not only would a storage array benefit from knowing about random vs sequential access, but expected redundancy hints would be huge in managing utilization. Joel -- Life's Little Instruction Book #396 "Never give anyone a fruitcake." Joel Becker Consulting Software Developer Oracle E-mail: joel.becker@oracle.com Phone: (650) 506-8127 -- 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/