[Tech Request]: dynamic adjustment of GCPercent via RPC

[xzxiong]

Is there an existing issue for the same tech request?

• [X] I have checked the existing issues.

Does this tech request not affect user experience?

• [X] This tech request doesn't affect user experience.

What would you like to be added ?

An API that allows set/get GCPercent at runtime, the change should take effect before the RPC returns.

Why is this needed ?

The ability to dynamically adjust the GCPercent parameter at runtime via RPC, instead of setting GOMEMLIMIT byte paramter. A better way to adjust gc trigger.

Additional information

No response

[reusee]

https://pkg.go.dev/runtime/debug#SetMemoryLimit

https://pkg.go.dev/runtime/debug#SetGCPercent

用这两个函数即可。

[TangxingZhou]

测试通过