On 18.06.2020 10:32, Matias Bjørling wrote:

On 18/06/2020 10.27, Javier González wrote:

quoted

On 18.06.2020 10:04, Matias Bjørling wrote:

quoted

On 17/06/2020 19.23, Kanchan Joshi wrote:

quoted

This patchset enables issuing zone-append using aio and io-uring 
direct-io interface.

For aio, this introduces opcode IOCB_CMD_ZONE_APPEND. 
Application uses start LBA
of the zone to issue append. On completion 'res2' field is used 
to return
zone-relative offset.

For io-uring, this introduces three opcodes: 
IORING_OP_ZONE_APPEND/APPENDV/APPENDV_FIXED.
Since io_uring does not have aio-like res2, cqe->flags are 
repurposed to return zone-relative offset

Please provide a pointers to applications that are updated and 
ready to take advantage of zone append.

Good point. We are posting a RFC with fio support for append. We wanted
to start the conversation here before.

We can post a fork for improve the reviews in V2.

Christoph's response points that it is not exactly clear how this 
matches with the POSIX API.

Yes. We will address this.

fio support is great - but I was thinking along the lines of 
applications that not only benchmark performance. fio should be part 
of the supported applications, but should not be the sole reason the 
API is added.

Agree. It is a process with different steps. We definitely want to have
the right kernel interface before pushing any changes to libraries and /
or applications. These will come as the interface becomes more stable.

To start with xNVMe will be leveraging this new path. A number of
customers are leveraging the xNVMe API for their applications already.

Thanks,
Javier