Resctrl is the kernel's user-facing interface for CPU resource allocation features such as Intel's Cache Allocation Technology (CAT), Memory Bandwidth Allocation (MBA), and AMD's equivalents. It exposes a filesystem under /sys/fs/resctrl that lets administrators partition L2/L3 cache and memory bandwidth between workloads on modern x86 (and now Arm MPAM) servers.
This is not actually a hardware driver directory; it is the kernel subsystem and filesystem interface that lets userspace control CPU cache and memory-bandwidth partitioning features. It belongs in the tree as core infrastructure and is not a candidate for the same kind of removal review as legacy hardware drivers.
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monthly commits · 2021-04-21 → 2026-04-21 · 33 total · active in 5/61 months
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codex reasoning notes (technical)
Not a driver directory: resctrl is a kernel resource-control/filesystem subsystem interface, not a standalone hardware device driver directory.