Re: [PATCH 2/2] io_uring: add irq completion work to the head of task_list

[Hao Xu <haoxu@linux.alibaba.com>]

在 2021/8/24 上午2:36, Hao Xu 写道:
> Now we have a lot of task_work users, some are just to complete a req
> and generate a cqe. Let's put the work at the head position of the
> task_list, so that it can be handled quickly and thus to reduce
> avg req latency. an explanatory case:
> 
> origin timeline:
>      submit_sqe-->irq-->add completion task_work
>      -->run heavy work0~n-->run completion task_work
> now timeline:
>      submit_sqe-->irq-->add completion task_work
>      -->run completion task_work-->run heavy work0~n
> 
> Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
sorry, sent this old version by mistake, will send latest version later.
the latest one is to add high priority task_work to the front of
task_list in the time order, not the reverse order.