Kernel Scheduler / MM / VFS Internals

When to use

• Answering or reviewing "how does the Linux scheduler/allocator/VFS work" questions where the answer depends on the running kernel version.
• Explaining CPU fairness (vruntime/lag), memory allocation choices (kmalloc/vmalloc/buddy/SLUB), or file path lookup (dcache/inode/file).
• Reading /proc/sched_debug, /proc/buddyinfo, /proc/slabinfo, /proc/vmallocinfo, or /proc/meminfo and interpreting their columns.
• Reviewing kernel-style code or documentation claims for an agent or PR.

When not to use

• Drivers/syscall interfaces (use kernel-uaccess-safety, kernel-atomic-context).
• ftrace/kprobes/kdump tooling — use kernel-debugging-ftrace-kprobes-kdump.
• Containers/cgroups/namespaces — use kernel-container-internals.
• Actually modifying the kernel scheduler/MM/VFS — that needs the tree and a test host; this skill only validates the claims you make about it.