In this commit:
commit fedc37448fb1be5d03e420ca7791d4286893d5ec
Author: SeongJae Park <sjpark@xxxxxxxxx>
Date: Tue Aug 10 16:55:51 2021 +1000
mm/idle_page_tracking: make PG_idle reusable
diff --git a/mm/Kconfig b/mm/Kconfig
index 504336de9a1e..d0b85dc12429 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -739,10 +739,18 @@ config DEFERRED_STRUCT_PAGE_INIT
lifetime of the system until these kthreads finish the
initialisation.
+config PAGE_IDLE_FLAG
+ bool "Add PG_idle and PG_young flags"
+ help
+ This feature adds PG_idle and PG_young flags in 'struct page'. PTE
+ Accessed bit writers can set the state of the bit in the flags to let
+ other PTE Accessed bit readers don't disturbed.
This needs to be converted to proper, or at least comprehensible, English....
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