Re: [PATCHSET v5] Support for polled aio

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On 12/7/18 12:35 PM, Jens Axboe wrote:
> On 12/7/18 12:34 PM, Jeff Moyer wrote:
>> Jens Axboe <axboe@xxxxxxxxx> writes:
>>
>>> BTW, quick guess is that it doesn't work so well with fixed buffers, as that
>>> hasn't been tested. You could try and remove IOCTX_FLAG_FIXEDBUFS from the
>>> test program and see if that works.
>>
>> That results in a NULL pointer dereference.  I'll stick to block device
>> testing for now.  :)
> 
> Good plan :-)

Took a look and fixed it up, my aio-poll branch has a fixup patch and I
also updated an updated aio-ring.c in the same location.

Tested XFS with polling on and off, works for me.

Will take a look at FIXEDBUFS now. Note that aio-ring has some parameters
at the top:

static int polled = 1;          /* use IO polling */
static int fixedbufs = 0;       /* use fixed user buffers */

that you can change to try the various modes. Don't use fixedbufs = 1
with XFS just yet :-)

-- 
Jens Axboe




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