I want to know if the O(1) scheduler code, which was used in earlier versions of the Linux kernel, still exists in the current kernel source code. If it has been completely removed, which version of the Linux kernel was the last to include it? Any guidance or references to relevant parts of the source code would be greatly appreciated.

I have free(unallocated) 18.5GB SSD storage and 90gb HDD. I want to install kali linux such that it boots fastly from SSD and run all other needed packagesapplications on hdd
please help me!(I wan to run vs code in linux)

i very new to Linux , i was asked to tell what a program does after running it using strace