[$] A slab allocator (removal) update

The kernel developers try hard to avoid duplicating functionality in thekernel, which is enough of a challenge to maintain as it is. So it hasoften seemed out of character for the kernel to support three differentslab allocators (called SLAB, SLOB, and SLUB), all of which handle themanagement of small memory allocations in similar ways. At the 2023 Linux Storage, Filesystem,Memory-Management and BPF Summit, slab maintainer Vlastimil Babkaupdated the group on progress toward the goal of reducing the number ofslab allocators in the kernel and gave an overview of what to expect inthat area.