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[5.186.124.144]) by smtp.gmail.com with ESMTPSA id i3sm7380661wmq.18.2021.10.29.01.16.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Oct 2021 01:16:09 -0700 (PDT) Date: Fri, 29 Oct 2021 10:16:09 +0200 From: Javier =?utf-8?B?R29uesOhbGV6?= To: Hannes Reinecke Cc: Chaitanya Kulkarni , Johannes Thumshirn , Chaitanya Kulkarni , "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" , "axboe@kernel.dk" , "msnitzer@redhat.com" , "martin.petersen@oracle.com" , "roland@purestorage.com" , "mpatocka@redhat.com" , "kbusch@kernel.org" , "rwheeler@redhat.com" , "hch@lst.de" , "Frederick.Knight@netapp.com" , "zach.brown@ni.com" , "osandov@fb.com" , Adam Manzanares , SelvaKumar S , Nitesh Shetty , Kanchan Joshi , Vincent Fu , Bart Van Assche Subject: Re: [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload Message-ID: <20211029081609.obt7ssqxd3aotnum@ArmHalley.local> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 29.10.2021 07:51, Hannes Reinecke wrote: >On 10/29/21 2:21 AM, Chaitanya Kulkarni wrote: >>On 10/7/21 11:49 PM, Javier González wrote: >>>External email: Use caution opening links or attachments >>> >>> >>>On 06.10.2021 10:33, Bart Van Assche wrote: >>>>On 10/6/21 3:05 AM, Javier González wrote: >>>>>I agree that the topic is complex. However, we have not been able to >>>>>find a clear path forward in the mailing list. >>>> >>>>Hmm ... really? At least Martin Petersen and I consider device mapper >>>>support essential. How about starting from Mikulas' patch series that >>>>supports the device mapper? See also >>>>https://lore.kernel.org/all/alpine.LRH.2.02.2108171630120.30363@file01.intranet.prod.int.rdu2.redhat.com/ >>>> >> >>When we add a new REQ_OP_XXX we need to make sure it will work with >>device mapper, so I agree with Bart and Martin. >> >>Starting with Mikulas patches is a right direction as of now.. >> >>> >>>Thanks for the pointers. We are looking into Mikulas' patch - I agree >>>that it is a good start. >>> >>>>>What do you think about joining the call to talk very specific next >>>>>steps to get a patchset that we can start reviewing in detail. >>>> >>>>I can do that. >>> >>>Thanks. I will wait until Chaitanya's reply on his questions. We will >>>start suggesting some dates then. >>> >> >>I think at this point we need to at least decide on having a first call >>focused on how to proceed forward with Mikulas approach ... >> >>Javier, can you please organize a call with people you listed in this >>thread earlier ? >> >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. > I believe this is in essence what we are trying to convey here: a minimal patchset that enables Simple Copy and the infra around to extend copy-offload use-cases. I look forward to hear Keith's ideas around this! Javier