Re: [PATCHv2] blk-mq: remove hybrid polling

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On 3/20/23 2:56 PM, Keith Busch wrote:
> On Mon, Mar 20, 2023 at 12:49:26PM -0700, Keith Busch wrote:
>> From: Keith Busch <kbusch@xxxxxxxxxx>
>>
>> io_uring provides the only way user space can poll completions, and that
>> always sets BLK_POLL_NOSLEEP. This effectively makes hybrid polling dead
>> code, so remove it and everything supporting it.
> 
> Hybrid polling was effectively killed off with 9650b453a3d4b1, "block: ignore
> RWF_HIPRI hint for sync dio", so we could add a "Fixes: " for that. It was
> still potentially reachable through io_uring until d729cf9acb93119, "io_uring:
> don't sleep when polling for I/O", but hybrid polling probably should not have
> been reachable through that async interface from the beginning.

Thanks, I'll add it as fixing both of those. More as a reference than
anything else, it's not like we are backporting this change.

-- 
Jens Axboe





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