Re: [PATCH 05/16] Add io_uring IO interface

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 1/15/19 9:55 AM, Jens Axboe wrote:
> On 1/15/19 9:51 AM, Jonathan Corbet wrote:
>> On Mon, 14 Jan 2019 19:55:20 -0700
>> Jens Axboe <axboe@xxxxxxxxx> wrote:
>>
>> So the [0/16] cover letter seems to have gone astray this time?
> 
> It did go out, but I forgot to add a Subject line to it...
> 
> https://marc.info/?l=linux-block&m=154752095709422&w=2
> 
> 
>>> The submission queue (SQ) and completion queue (CQ) rings are shared
>>> between the application and the kernel. This eliminates the need to
>>> copy data back and forth to submit and complete IO.
>>>
>>> IO submissions use the io_uring_sqe data structure, and completions
>>> are generated in the form of io_uring_sqe data structures. The SQ
>>> ring is an index into the io_uring_sqe array, which makes it possible
>>> to submit a batch of IOs without them being contiguous in the ring.
>>> The CQ ring is always contiguous, as completion events are inherently
>>> unordered and can point to any io_uring_iocb.
>>>
>>> Two new system calls are added for this:
>>>
>>> io_uring_setup(entries, iovecs, params)
>>> 	Sets up a context for doing async IO. On success, returns a file
>>> 	descriptor that the application can mmap to gain access to the
>>> 	SQ ring, CQ ring, and io_uring_iocbs.
>>
>> Looking at the code, it would appear that the "iovecs" parameter doesn't
>> actually exist.
> 
> Indeed, need to update that commit message. and io_uring_iocbs should
> now be io_uring_sqes.
> 
> The iovec/file registration is done through io_uring_register(2).

Updated commit message which covers both this one, and the
IORING_ENTER_GETEVENTS below.

http://git.kernel.dk/cgit/linux-block/commit/?h=io_uring&id=d14a06629baef2b0701dbd01ac9c9066f73065ec

-- 
Jens Axboe




[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux