From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9BD4C433F5 for ; Mon, 1 Nov 2021 17:54:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B9B93610E8 for ; Mon, 1 Nov 2021 17:54:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231168AbhKAR4p (ORCPT ); Mon, 1 Nov 2021 13:56:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:37650 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229802AbhKAR4p (ORCPT ); Mon, 1 Nov 2021 13:56:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 00C82610D2; Mon, 1 Nov 2021 17:54:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1635789251; bh=lYi2aGJ1ooV9VTgAd9ni2Aq8I8gmC2AMQ2WBvVmGyXo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=USAxOoUpoPthTp0gPLaP0Dmz+IrOklnbz3hxfaINU34HdN1KKLosqti5cOqQYAaqx vAzwAmlRKJCS4A+x3oMJQC9AcOKtiJT2KoUaJ4cme5I1NotGS1dDN/bvui3u93bbcE B3Rn9jI2etOBKHaGzpWpNSKH8+DKvAoPRJRFBtf6N1zm28ciWQseguItfGTE8S5SGE gJyHvhjcrWhkpnG1mmJggGByc6GpS8LMJMtHSKeqjbFpDR5Mxh0w5yTRZEV8GrOCxe BxgY+sBpcZee82y2ujQ1VYBu2NSTbwyTRob4gcnvVGQ+X4+T1CrWDHjF0DwblF8aJB gzM9v7RS/EqpQ== Date: Mon, 1 Nov 2021 10:54:09 -0700 From: Keith Busch To: Bart Van Assche Cc: Hannes Reinecke , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "dm-devel@redhat.com" , "lsf-pc@lists.linux-foundation.org" Subject: Re: [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload Message-ID: <20211101175409.GA2651512@dhcp-10-100-145-180.wdc.com> References: <20210928191340.dcoj7qrclpudtjbo@mpHalley.domain_not_set.invalid> <20211006100523.7xrr3qpwtby3bw3a@mpHalley.domain_not_set.invalid> <20211008064925.oyjxbmngghr2yovr@mpHalley.local> <2a65e231-11dd-d5cc-c330-90314f6a8eae@nvidia.com> <5edcab45-afc6-3766-cede-f859da2934d1@acm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5edcab45-afc6-3766-cede-f859da2934d1@acm.org> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On Fri, Oct 29, 2021 at 09:15:43AM -0700, Bart Van Assche wrote: > On 10/28/21 10:51 PM, Hannes Reinecke wrote: > > Also Keith presented his work on a simple zone-based remapping block device, which included an in-kernel copy offload facility. > > Idea is to lift that as a standalone patch such that we can use it a fallback (ie software) implementation if no other copy offload mechanism is available. > > Is a link to the presentation available? Thanks for the interest. I didn't post them online as the conference didn't provide it, and I don't think the slides would be particularly interesting without the prepared speech anyway. The presentation described a simple prototype implementing a redirection table on zone block devices. There was one bullet point explaining how a generic kernel implementation would be an improvement. For zoned block devices, an "append" like copy offload would be an even better option.