Linux io_uring support and ulimit memlock

[sullis]

Description

OS: Linux (ubuntu-latest)

I have a GitHub Actions workflow that tries to utilize io_uring from Java

https://github.com/sullis/netty-playground/runs/4450624231?check_suite_focus=true

The error message is:

java.lang.RuntimeException: failed to create io_uring ring fd Cannot allocate memory
	at io.netty.incubator.channel.uring.Native.ioUringSetup(Native Method)
	at io.netty.incubator.channel.uring.Native.createRingBuffer(Native.java:169)
	at io.netty.incubator.channel.uring.Native.createRingBuffer(Native.java:202)
	at io.netty.incubator.channel.uring.IOUring.<clinit>(IOUring.java:41)

In the workflow, I print the ulimit value:

$ ulimit -l
64

Is there any way to change the ulimit memlock value? Is there a workaround?

Virtual environments affected

• Ubuntu 18.04
• Ubuntu 20.04
• macOS 10.15
• macOS 11
• Windows Server 2016
• Windows Server 2019
• Windows Server 2022

Image version and build link

https://github.com/sullis/netty-playground/runs/4450624231?check_suite_focus=true

Is it regression?

No response

Expected behavior

No response

Actual behavior

No response

Repro steps

Java code:
https://github.com/sullis/netty-playground/blob/main/src/test/java/io/github/sullis/netty/playground/IoUringTest.java

Workflow:
https://github.com/sullis/netty-playground/blob/main/.github/workflows/ci.yml

Run:
https://github.com/sullis/netty-playground/runs/4450624231?check_suite_focus=true

[al-cheb]

Hey, @sullis

It affects only the running shell, that's why you should run all commands in it:

- name: Build
  run: |
          sudo env "PATH=$PATH" bash -c "ulimit -l 65536 && ulimit -a && mvn --no-transfer-progress -B clean test"

[sullis]

Thanks @al-cheb - your solution works for me. I will close this issue.