tree d3a90388b35fb242b4724a3b07fe76a170f80c90
parent d848074b2f1eb11a38691285f7366bce83087014
author Jens Axboe <axboe@kernel.dk> 1569692205 -0600
committer Jens Axboe <axboe@kernel.dk> 1572366161 -0600

io_uring: run dependent links inline if possible

Currently any dependent link is executed from a new workqueue context,
which means that we'll be doing a context switch per link in the chain.
If we are running the completion of the current request from our async
workqueue and find that the next request is a link, then run it directly
from the workqueue context instead of forcing another switch.

This improves the performance of linked SQEs, and reduces the CPU
overhead.

Reviewed-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>