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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0DF9BC433FE for ; Thu, 3 Mar 2022 18:36:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235609AbiCCShg (ORCPT ); Thu, 3 Mar 2022 13:37:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49722 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233030AbiCCShe (ORCPT ); Thu, 3 Mar 2022 13:37:34 -0500 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A7561A41CA for ; Thu, 3 Mar 2022 10:36:47 -0800 (PST) Received: by mail-wr1-x42e.google.com with SMTP id d3so9219397wrf.1 for ; Thu, 03 Mar 2022 10:36:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arrikto-com.20210112.gappssmtp.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=gSsCl/XOESNqiNL4KQnFJzGeYGKZJS/OXefqIbgZZJY=; b=xv4zkThkBLX7HuXqZhTfHDYEZKNHRIBCccoLghrxv746zdKoMUitS4RnI/cGuGlDPQ vfANpAF7D/SOQuhdavvwEHHH47Qe4rpi+IsklXWeODKqDiVmFthh1F6OigEyCr/o27Gd Zlx44ZPUSEX8vFl2XZ5eEXc5WRHRksczAMyu2nxfK4OXd4FLzkuC7Fx+PO2LKk4Sj7k2 lAVUF6SBc5gRRYNmWr6bFsQFcG3+ERQzr4uXhWYF+qnNkFDC0G+4pOrPugWGltcGxKei uHeqxuFvKXtDxibeNqrmYwAlqmHnsFQKAUqkvIDqpRvMP9f5y/5Uw4MYYGF+P4M4GCG4 9b4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=gSsCl/XOESNqiNL4KQnFJzGeYGKZJS/OXefqIbgZZJY=; b=ivclwLxT9UQ1R2rTeXVe+My/FvChvqoi4zg/yDgAZXjmy0CQb5M/UPwNZ3ITk/yaKi uakBwFH66rmrV3ApurWw6d2uU5mX8zl8dJ40v26uyXbLcuis1jjY8iVBFoJ8nDnx+uoX mbTLPzce7SWhX6NwtO29VftqYiuUgv7Ks0utL1BBTAgrc6GhuwQXC50XzJJnX8GwMql3 txac+zfdW6+/2nxyy3eqAIQHfGBc23GZnPNRFXtQj7zXehQmuns76DIS/chssKu23SkQ AdYcYYFd5lWCk+o7Ijm2ZsHj8HTelld6u0qX18/KIDR3NWbibebqTYwLce0DYqBKHfzK qNNA== X-Gm-Message-State: AOAM532Khlqmr7pxNv5Mg9M4Ke84ezQmguY3UfsgU/JGEPh4cqtklhCd BHTBotbdmnzZvqrZzJ87u3ljoA== X-Google-Smtp-Source: ABdhPJxWp//CMSQXMH4wlOTWsuUAaFU8DcmiZw37tn30FWgGhLmSgbx50j5GThznhd1HjqQ4Zon/5g== X-Received: by 2002:a5d:61cb:0:b0:1f0:2598:88ff with SMTP id q11-20020a5d61cb000000b001f0259888ffmr7318696wrv.444.1646332605416; Thu, 03 Mar 2022 10:36:45 -0800 (PST) Received: from [172.16.10.50] (213.16.240.129.dsl.dyn.forthnet.gr. [213.16.240.129]) by smtp.gmail.com with ESMTPSA id x15-20020adfdd8f000000b001f0473a0a3fsm2705941wrl.14.2022.03.03.10.36.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Mar 2022 10:36:44 -0800 (PST) Message-ID: <0e63b59c-779c-d85b-693e-79d2924acbe0@arrikto.com> Date: Thu, 3 Mar 2022 20:36:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 Subject: Re: [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload Content-Language: en-US To: Chaitanya Kulkarni Cc: "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "dm-devel@redhat.com" , "linux-nvme@lists.infradead.org" , linux-fsdevel , Jens Axboe , "msnitzer@redhat.com >> msnitzer@redhat.com" , Bart Van Assche , "martin.petersen@oracle.com >> Martin K. Petersen" , "roland@purestorage.com" , "mpatocka@redhat.com" , Hannes Reinecke , "kbus >> Keith Busch" , Christoph Hellwig , "Frederick.Knight@netapp.com" , "zach.brown@ni.com" , "osandov@fb.com" , "lsf-pc@lists.linux-foundation.org" , "djwong@kernel.org" , "josef@toxicpanda.com" , "clm@fb.com" , "dsterba@suse.com" , "tytso@mit.edu" , "jack@suse.com" References: <012723a9-2e9c-c638-4944-fa560e1b0df0@arrikto.com> From: Nikos Tsironis In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 3/1/22 23:32, Chaitanya Kulkarni wrote: > Nikos, > >>> [8] https://kernel.dk/io_uring.pdf >> >> I would like to participate in the discussion too. >> >> The dm-clone target would also benefit from copy offload, as it heavily >> employs dm-kcopyd. I have been exploring redesigning kcopyd in order to >> achieve increased IOPS in dm-clone and dm-snapshot for small copies over >> NVMe devices, but copy offload sounds even more promising, especially >> for larger copies happening in the background (as is the case with >> dm-clone's background hydration). >> >> Thanks, >> Nikos > > If you can document your findings here it will be great for me to > add it to the agenda. > Hi, Give me a few days to gather my notes, because it's been a while since the last time I worked on this, and I will come back with a summary of my findings. Nikos