mirror of
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
synced 2025-10-24 13:57:14 +10:00
685fe7feed
io-wq relies on a manager thread to create/fork new workers, as needed. But there's really no strong need for it anymore. We have the following cases that fork a new worker: 1) Work queue. This is done from the task itself always, and it's trivial to create a worker off that path, if needed. 2) All workers have gone to sleep, and we have more work. This is called off the sched out path. For this case, use a task_work items to queue a fork-worker operation. 3) Hashed work completion. Don't think we need to do anything off this case. If need be, it could just use approach 2 as well. Part of this change is incrementing the running worker count before the fork, to avoid cases where we observe we need a worker and then queue creation of one. Then new work comes in, we fork a new one. That last queue operation should have waited for the previous worker to come up, it's quite possible we don't even need it. Hence move the worker running from before we fork it off to more efficiently handle that case. Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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