[$] Better tools for out-of-memory debugging

Out-of-memory (OOM) situations are dreaded by users, system administrators,and kernel developers alike. Usually, all that is known is that a lot ofmemory is being used somewhere and the system has run out, but the kernel provides little help toanybody trying to figure out where the memory has gone. In a memory-managementsession at the 2022Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM),Kent Overstreet asked what could be done to improve OOM reports and reducethe pain for all involved.