[$] Seeking smaller kernel stacks

Memory has always been a scarce resource in computing systems, but theproblem seems to have worsened recently. In particular, the worldwideshortage of memory chips has led to a renewed focus by systems developerson reducing memory usage. During the memory-management microconference atthe 2026 Linux Plumbers Conference, WillDeacon discussed one specific consumer of memory that is beingre-examined: kernel stacks.