I'm running Armbian 20.11.3 Buster on the Odroid N2 (kernel 5.9.14-meson64). I wanted information on memory pressure of the system, but I was surprised to see that pressure stall information (PSI) was not at /proc/pressure/memory. I then noticed that the PSI tool is not configured in the Armbian build. Specifically, the /boot/config-5.9.14-meson64 file contains "# CONFIG_PSI is not set"

 

Why is pressure stall information not configured on Armbian? Are there better or other tools to provide this information? I briefly looked at free and /proc/meminfo, but I'm of the opinion that unused RAM is wasted and looking at free memory is not a good indicator if operations are memory constrained.

On 12/30/2020 at 4:11 AM, 7825asp said:

I then noticed that the PSI tool is not configured in the Armbian build. Specifically, the /boot/config-5.9.14-meson64 file contains "# CONFIG_PSI is not set"

It is possible that something that is important to you is missing. tl;dr; The reason is that our kernels are coming from the low resources minimal world and we have many different kernels.  What Armbian don't have are maintaining resources to be able to serve users wishes. No matter how big or small.

 

https://docs.armbian.com/Process_Contribute/

Here - make it for all:

https://github.com/armbian/build/tree/master/config/kernel

OK will do - thank you