Add configuration options for multigenerational lru.
Signed-off-by: Yu Zhao <yuz...@google.com>
---
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
