LRU

What mglru actually replaces The multi-generational LRU (mglru, also lru_gen in the kernel source) is the replacement page-reclaim algorithm merged in Linux 6.1 (commit c174c2cd0441, end of 2022, Yu Zhao’s 12-patch series). It sits next to the classic active/inactive LRU — both compile paths exist in mm/vmscan.c and you choose at boot with CONFIG_LRU_GEN_ENABLED. The... » read more

What the memory controller actually does The cgroup v2 memory controller enforces a per-cgroup memory budget that the page allocator checks at every allocation. When a cgroup exceeds its allowance, the kernel starts reclaiming its pages, slowing down its tasks under memory pressure, and — if the cgroup is at its hard limit and cannot... » read more