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27 March 2024, 02:37:15 UTC
Revision 533ab73f5b5c95dcb4152b52d5482abcc824c690 authored by Wenwen Chen on 25 May 2023, 08:26:26 UTC, committed by Jens Axboe on 25 May 2023, 15:30:13 UTC 
io_uring: unlock sqd->lock before sq thread release CPU
 
The sq thread actively releases CPU resources by calling the
cond_resched() and schedule() interfaces when it is idle. Therefore,
more resources are available for other threads to run.

There exists a problem in sq thread: it does not unlock sqd->lock before
releasing CPU resources every time. This makes other threads pending on
sqd->lock for a long time. For example, the following interfaces all
require sqd->lock: io_sq_offload_create(), io_register_iowq_max_workers()
and io_ring_exit_work().

Before the sq thread releases CPU resources, unlocking sqd->lock will
provide the user a better experience because it can respond quickly to
user requests.

Signed-off-by: Kanchan Joshi<joshi.k@samsung.com>
Signed-off-by: Wenwen Chen<wenwen.chen@samsung.com>
Link: https://lore.kernel.org/r/20230525082626.577862-1-wenwen.chen@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 293007b
History
Tip revision: 533ab73f5b5c95dcb4152b52d5482abcc824c690 authored by Wenwen Chen on 25 May 2023, 08:26:26 UTC
io_uring: unlock sqd->lock before sq thread release CPU
Tip revision: 533ab73
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