Add configuration options for multigenerational lru. Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx> --- mm/Kconfig | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/mm/Kconfig b/mm/Kconfig index 24c045b24b95..3a5bcc2d7a45 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -872,4 +872,33 @@ config MAPPING_DIRTY_HELPERS config KMAP_LOCAL bool +config LRU_GEN + bool "Multigenerational LRU" + depends on MMU + help + High performance multigenerational LRU to heavily overcommit workloads + that are not IO bound. See Documentation/vm/multigen_lru.rst for + details. + + Warning: do not enable this option unless you plan to use it because + it introduces a small per-process memory overhead. + +config NR_LRU_GENS + int "Max number of generations" + depends on LRU_GEN + range 4 63 + default 7 + help + This will use ilog2(N)+1 spare bits from page flags. + + Warning: do not use numbers larger than necessary because each + generation introduces a small per-node and per-memcg memory overhead. + +config LRU_GEN_ENABLED + bool "Turn on by default" + depends on LRU_GEN + help + The default value of /sys/kernel/mm/lru_gen/enabled is 0. This option + changes it to 1. + endmenu -- 2.31.0.rc2.261.g7f71774620-goog
