Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932973Ab1EZTOY (ORCPT ); Thu, 26 May 2011 15:14:24 -0400 Received: from mx1.fusionio.com ([66.114.96.30]:58720 "EHLO mx1.fusionio.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758357Ab1EZTOX (ORCPT ); Thu, 26 May 2011 15:14:23 -0400 X-ASG-Debug-ID: 1306437261-03d6a512a807780001-xx1T2L X-Barracuda-Envelope-From: JAxboe@fusionio.com Message-ID: <4DDEA689.2090004@fusionio.com> Date: Thu, 26 May 2011 21:14:17 +0200 From: Jens Axboe MIME-Version: 1.0 To: "Martin K. Petersen" CC: Mike Snitzer , Mandeep Singh Baines , "linux-kernel@vger.kernel.org" , "jrbarnette@chromium.org" , Neil Brown , Alasdair G Kergon , "dm-devel@redhat.com" Subject: Re: dm: pass up rotational flag References: <1306356648-30730-1-git-send-email-msb@chromium.org> <20110526182321.GA26219@redhat.com> X-ASG-Orig-Subj: Re: dm: pass up rotational flag In-Reply-To: Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Barracuda-Connect: mail1.int.fusionio.com[10.101.1.21] X-Barracuda-Start-Time: 1306437261 X-Barracuda-URL: http://10.101.1.180:8000/cgi-mod/mark.cgi X-Barracuda-Spam-Score: 0.00 X-Barracuda-Spam-Status: No, SCORE=0.00 using per-user scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=9.0 tests= X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.2.64744 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 870 Lines: 23 On 2011-05-26 20:29, Martin K. Petersen wrote: >>>>>> "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... Agree, would be a better idea. -- Jens Axboe -- 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/