[LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload

[Hannes Reinecke]

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.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
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