Re: [PATCH 14/26] aio: support for IO polling

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On 12/18/18 7:54 AM, Benny Halevy wrote:
> On Tue, 2018-12-18 at 06:27 -0700, Jens Axboe wrote:
>> On 12/18/18 3:32 AM, Benny Halevy wrote:
>>> On Thu, 2018-12-13 at 10:56 -0700, Jens Axboe wrote:
>>>> Add polled variants of PREAD/PREADV and PWRITE/PWRITEV. These act
>>>> like their non-polled counterparts, except we expect to poll for
>>>> completion of them. The polling happens at io_getevent() time, and
>>>> works just like non-polled IO.
>>>>
>>>> To setup an io_context for polled IO, the application must call
>>>> io_setup2() with IOCTX_FLAG_IOPOLL as one of the flags. It is illegal
>>>> to mix and match polled and non-polled IO on an io_context.
>>>>
>>>> Polled IO doesn't support the user mapped completion ring. Events
>>>> must be reaped through the io_getevents() system call. For non-irq
>>>> driven poll devices, there's no way to support completion reaping
>>>> from userspace by just looking at the ring. The application itself
>>>> is the one that pulls completion entries.
>>>>
>>>> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
>>>>
>>>
>>> Looks good to me, thanks.
>>
>> Is that a reviewed-by?
>>
> 
> Yes.
> 
> Reviewed-by: Benny Halevy <bhalevy@xxxxxxxxxxxx>

Thanks Benny, added.

-- 
Jens Axboe




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