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

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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?

-- 
Jens Axboe




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