[$] Memory persistence over kexec

The kernel's kexecmechanism allows one kernel to directly boot a new one; it can bethought of as a sort of kernel equivalent to the execve()system call. Kexec has a number of uses, including booting a special kernelto perform dumps after a crash. Normally, one does not expect user-spaceprocesses to survive booting into a new kernel, but that has not stoppeddevelopers from trying to implement that ability. Mike Rapoport ran amemory-management-track session at the 2025 Linux Storage, Filesystem,Memory-Management, and BPF Summit to discuss one piece of that problem:enabling the contents of memory to persist across a kexec handover so thatthe new kernel can pick up where the old one left off.