linux-kernel - [RFC PATCH 0/2] SKSM: Synchronous Kernel Samepage Merging

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Message-Id: <20250228023043.83726-1-mathieu.desnoyers@efficios.com>
Date: Thu, 27 Feb 2025 21:30:41 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Olivier Dion <odion@...icios.com>,
	linux-mm@...ck.org
Subject: [RFC PATCH 0/2] SKSM: Synchronous Kernel Samepage Merging

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@...ux-foundation.org>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Olivier Dion <odion@...icios.com>
Cc: linux-mm@...ck.org

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