Messages in this thread | | | Subject | Re: [PATCH 0/3] zone-append support in aio and io-uring | From | Matias Bjørling <> | Date | Thu, 18 Jun 2020 22:04:30 +0200 |
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On 18/06/2020 21.21, Kanchan Joshi wrote: > On Thu, Jun 18, 2020 at 10:04:32AM +0200, Matias Bjørling wrote: >> On 17/06/2020 19.23, Kanchan Joshi wrote: >>> 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. >> >> I do not believe it's beneficial at this point to change the libaio >> API, applications that would want to use this API, should anyway >> switch to use io_uring. >> >> Please also note that applications and libraries that want to take >> advantage of zone append, can already use the zonefs file-system, as >> it will use the zone append command when applicable. > > AFAIK, zonefs uses append while serving synchronous I/O. And append bio > is waited upon synchronously. That maybe serving some purpose I do > not know currently. But it seems applications using zonefs file > abstraction will get benefitted if they could use the append > themselves to > carry the I/O, asynchronously. Yep, please see Christoph's comment regarding adding the support to zonefs.
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