[$] Allocator optimizations for transparent huge pages

The original Linux kernel, posted in 1991, ran on a system with a 4KB pagesize. Over 30years later, most of us are still running on systemswith 4KB pages, even though the amount of installed memory has grown by afew orders of magnitude. It is generally accepted that using large pagesizes results in better performance for most applications, but allocatinglarger pages is often difficult. During a memory-management session at the 2024 Linux Storage,Filesystem, Memory-Management and BPF Summit, Yu Zhao presented hisideas on improving the allocation of huge pages in the kernel.