This series introduces SKSM, a new page deduplication ABI, aiming to fix the limitations inherent to the KSM ABI. The implementation is simple enough: SKSM is implemented in about 100 LOC compared to 2.5k LOC for KSM (on top of the common KSM helpers). This is sent as a proof of concept. It applies on top of v6.13. Feedback is welcome! Mathieu Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> Cc: Olivier Dion <odion@xxxxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Mathieu Desnoyers (2): mm: Introduce SKSM: Synchronous Kernel Samepage Merging selftests/kskm: Introduce SKSM basic test include/linux/ksm.h | 4 + include/linux/mm_types.h | 7 + include/linux/page-flags.h | 42 ++++ include/linux/sksm.h | 27 +++ include/uapi/asm-generic/mman-common.h | 2 + mm/Kconfig | 5 + mm/Makefile | 1 + mm/ksm-common.h | 228 ++++++++++++++++++++++ mm/ksm.c | 219 +-------------------- mm/madvise.c | 6 + mm/memory.c | 2 + mm/page_alloc.c | 3 + mm/sksm.c | 190 ++++++++++++++++++ tools/testing/selftests/sksm/.gitignore | 2 + tools/testing/selftests/sksm/Makefile | 14 ++ tools/testing/selftests/sksm/basic_test.c | 217 ++++++++++++++++++++ 16 files changed, 751 insertions(+), 218 deletions(-) create mode 100644 include/linux/sksm.h create mode 100644 mm/ksm-common.h create mode 100644 mm/sksm.c create mode 100644 tools/testing/selftests/sksm/.gitignore create mode 100644 tools/testing/selftests/sksm/Makefile create mode 100644 tools/testing/selftests/sksm/basic_test.c -- 2.39.5
