Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758126Ab1EZS36 (ORCPT ); Thu, 26 May 2011 14:29:58 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:29456 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753892Ab1EZS35 (ORCPT ); Thu, 26 May 2011 14:29:57 -0400 To: Mike Snitzer Cc: Mandeep Singh Baines , linux-kernel@vger.kernel.org, jrbarnette@chromium.org, Neil Brown , Jens Axboe , "Martin K. Petersen" , Alasdair G Kergon , dm-devel@redhat.com Subject: Re: dm: pass up rotational flag From: "Martin K. Petersen" Organization: Oracle References: <1306356648-30730-1-git-send-email-msb@chromium.org> <20110526182321.GA26219@redhat.com> Date: Thu, 26 May 2011 14:29:41 -0400 In-Reply-To: <20110526182321.GA26219@redhat.com> (Mike Snitzer's message of "Thu, 26 May 2011 14:23:21 -0400") Message-ID: User-Agent: Gnus/5.110013 (No Gnus v0.13) Emacs/23.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Source-IP: rtcsinet22.oracle.com [66.248.204.30] X-CT-RefId: str=0001.0A090208.4DDE9C21.00C5:SCFSTAT5015188,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 805 Lines: 19 >>>>> "Mike" == Mike Snitzer writes: >> Allow the NONROT flag to be passed through to linear mappings if all >> underlying device are non-rotational. Tools like ureadahead will >> schedule IOs differently based on the rotational flag. Mike> Thanks for doing this, looks good in general. I'd rather we made the rotational property part of the topology instead of having to special-case it in DM. I seem to recall posting a patch that did that at some point but I can't seem to find it... -- Martin K. Petersen Oracle Linux Engineering -- 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/