To implement this feature, a new function called "shrink_memory" has been added, which can recycle a specific amount of memory. This feature mainly supports the following two functions: 1) add periodical memory reclaim 2) add pagecache limit Above functionalities depend on CONFIG_PAGE_CACHE_LIMIT, and the interface and functionality tests have been successfully completed. ChangeLog: - Some minor changes about description and code, no functional changes - rename page_cache_shrink_memory to shrink_memory - move the declaration of the 'shrink_memory' function to 'internal.h', no functional changes - add description information for function "shrink_memory" - update documentation for using feature alerts Ze Zuo (2): mm: support periodical memory reclaim mm: support pagecache limit Documentation/admin-guide/sysctl/vm.rst | 43 +++++ mm/Kconfig | 13 ++ mm/Makefile | 1 + mm/internal.h | 4 + mm/page_cache_limit.c | 199 ++++++++++++++++++++++++ mm/vmscan.c | 39 +++++ 6 files changed, 299 insertions(+) create mode 100644 mm/page_cache_limit.c -- 2.25.1