upgrade to 2.3 and add anolis liburing features · Pull Request !6 · src-anolis-os/liburing

由于liburing可以自主检查内核支持的特性，使用高版本的liburing+低版本的内核问题不大。我希望能够一步到位，采用最新的2.3版本。同时我把龙蜥社区在liburing（ https://gitee.com/anolis/liburing ）的自研特性移植过来了，方便使用。

已经自验证升级/降级成功。liburing构建依赖gcc和make，正确。liburing没有运行依赖。功能性验证：liburing自带test，测试人员平时会从这个仓库下载代码运行用例并上报bugzilla（例如： https://bugzilla.openanolis.cn/show_bug.cgi?id=3346 ），因此不需要再额外集成测试用例。

2.1-2.3功能变化见changelog:

- Support non-libc build for aarch64.
- Add io_uring_{enter,enter2,register,setup} syscall functions.
- Add sync cancel interface, io_uring_register_sync_cancel().
- Fix return value of io_uring_submit_and_wait_timeout() to match the
  man page.
- Improvements to the regression tests
- Add support and test case for passthrough IO
- Add recv and recvmsg multishot helpers and support
- Add documentation and support for IORING_SETUP_DEFER_TASKRUN
- Fix potential missing kernel entry with IORING_SETUP_IOPOLL
- Add support and documentation for zero-copy network transmit
- Various optimizations
- Many cleanups
- Many man page additions and updates

liburing-2.2 release

- Support non-libc builds.
- Optimized syscall handling for x86-64/x86/aarch64.
- Enable non-lib function calls for fast path functions.
- Add support for multishot accept.
- io_uring_register_files() will set RLIMIT_NOFILE if necessary.
- Add support for registered ring fds, io_uring_register_ring_fd(),
  reducing the overhead of an io_uring_enter() system call.
- Add support for the message ring opcode.
- Add support for newer request cancelation features.
- Add support for IORING_SETUP_COOP_TASKRUN, which can help reduce the
  overhead of io_uring in general. Most applications should set this flag,
  see the io_uring_setup.2 man page for details.
- Add support for registering a sparse buffer and file set.
- Add support for a new buffer provide scheme, see
  io_uring_register_buf_ring.3 for details.
- Add io_uring_submit_and_wait_timeout() for submitting IO and waiting
  for completions with a timeout.
- Add io_uring_prep_{read,write}v2 prep helpers.
- Add io_uring_prep_close_direct() helper.
- Add support for SQE128 and CQE32, which are doubly sized SQE and CQE
  rings. This is needed for some cases of the new IORING_OP_URING_CMD,
  notably for NVMe passthrough.
- ~5500 lines of man page additions, including adding ~90 new man pages.
- Synced with the 5.19 kernel release, supporting all the features of
  5.19 and earlier.
- 24 new regression test cases, and ~7000 lines of new tests in general.
- General optimizations and fixes.

此外还包括如下自研特性：
- IORING_SETUP_SQPOLL_PERCPU. Add a new IORING_SETUP_SQPOLL_PERCPU flag,
  this flag is only meaningful when IORING_SETUP_SQPOLL and
  IORING_SETUP_SQ_AFF are both specified, that means if user creates
  multiple  io_uring  instances which are all bound to one same cpu, only
  a kernel thread is created for this cpu to perform these io_uring
  instances' submission queue polling.
- add flag IORING_SETUP_IDLE_US to support microsecond granularity
  io_sq_thread_idle.
- add IORING_ENTER_SQ_SUBMIT_ON_IDLE flag to allow the original task to
  submit some sqes to reduce
sqthread wakeup latency.

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