Re: [PATCH] io_uring: get rid of intermediate aux cqe caches

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On 2/29/24 9:36 AM, Pavel Begunkov wrote:
> With defer taskrun we store aux cqes into a cache array and then flush
> into the CQ, and we also maintain the ordering so aux cqes are flushed
> before request completions. Why do we need the cache instead of pushing
> them directly? We acutally don't, so let's kill it.
> 
> One nuance is synchronisation -- the path we touch here is only for
> DEFER_TASKRUN and guaranteed to be executed in the task context, and
> all cqe posting is serialised by that. We also don't need locks because
> of that, see __io_cq_lock().

Nicely spotted! Looks good to me.

-- 
Jens Axboe





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