chenBright opened a new pull request, #3683:
URL: https://github.com/apache/brpc/pull/3683
### What problem does this PR solve?
Issue Number: resolve #1120
Problem Summary:
When event dispatchers occupy all bthread workers in `epoll_wait` or
`kevent`,
other bthreads cannot run. This can stall request processing and server
shutdown,
particularly when `event_dispatcher_num >= num_threads`.
### What is changed and the side effects?
Changed:
- Add `bthread_add_reserved_concurrency_by_tag(num, tag)` to increment
reserved concurrency.
- Reserve an extra worker for each event dispatcher and internal epoll
bthread. Reserved workers are
created eagerly, including when lazy growth is enabled.
- Track normal and reserved concurrency separately. Keep
`TaskControl::concurrency()` as their total.
- Use independent per-tag limits of 1024 normal workers and 512 reserved
workers, allowing reservations
even when normal concurrency reaches its limit.
Side effects:
- Performance effects:
- Breaking backward compatibility:
---
### Check List:
- Please make sure your changes are compilable.
- When providing us with a new feature, it is best to add related tests.
- Please follow [Contributor Covenant Code of
Conduct](https://github.com/apache/brpc/blob/master/CODE_OF_CONDUCT.md).
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