From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ric Wheeler Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes Date: Wed, 22 Jan 2014 09:10:48 -0500 Message-ID: <52DFD168.8080001@redhat.com> References: <20131220093022.GV11295@suse.de> <52DF353D.6050300@redhat.com> <20140122093435.GS4963@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, lsf-pc@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Andrew Morton To: Mel Gorman Return-path: In-Reply-To: <20140122093435.GS4963@suse.de> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On 01/22/2014 04:34 AM, Mel Gorman wrote: > On Tue, Jan 21, 2014 at 10:04:29PM -0500, Ric Wheeler wrote: >> One topic that has been lurking forever at the edges is the current >> 4k limitation for file system block sizes. Some devices in >> production today and others coming soon have larger sectors and it >> would be interesting to see if it is time to poke at this topic >> again. >> > Large block support was proposed years ago by Christoph Lameter > (http://lwn.net/Articles/232757/). I think I was just getting started > in the community at the time so I do not recall any of the details. I do > believe it motivated an alternative by Nick Piggin called fsblock though > (http://lwn.net/Articles/321390/). At the very least it would be nice to > know why neither were never merged for those of us that were not around > at the time and who may not have the chance to dive through mailing list > archives between now and March. > > FWIW, I would expect that a show-stopper for any proposal is requiring > high-order allocations to succeed for the system to behave correctly. > I have a somewhat hazy memory of Andrew warning us that touching this code takes us into dark and scary places. ric -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org