This is a follow-up to [1]: [PATCH v9 0/3] mm: process/cgroup ksm support
which is now in mm-stable. Ideally we'd get at least patch #1 into the same kernel release as [1], so the semantics of setting PR_SET_MEMORY_MERGE=0 are unchanged between kernel versions.
(1) Make PR_SET_MEMORY_MERGE=0 unmerge pages like setting MADV_UNMERGEABLE does, (2) add a selftest for it and (3) factor out disabling of KSM from s390/gmap code.
v1 -> v2: - "mm/ksm: unmerge and clear VM_MERGEABLE when setting PR_SET_MEMORY_MERGE=0" -> Cleanup one if/else -> Add doc for ksm_disable_merge_any() - Added ACKs
[1] https://lkml.kernel.org/r/20230418051342.1919757-1-shr@devkernel.io
Cc: Andrew Morton akpm@linux-foundation.org Cc: Stefan Roesch shr@devkernel.io Cc: Rik van Riel riel@surriel.com Cc: Johannes Weiner hannes@cmpxchg.org Cc: Michal Hocko mhocko@suse.com Cc: Christian Borntraeger borntraeger@linux.ibm.com Cc: Janosch Frank frankja@linux.ibm.com Cc: Claudio Imbrenda imbrenda@linux.ibm.com Cc: Heiko Carstens hca@linux.ibm.com Cc: Vasily Gorbik gor@linux.ibm.com Cc: Sven Schnelle svens@linux.ibm.com Cc: Shuah Khan shuah@kernel.org
David Hildenbrand (3): mm/ksm: unmerge and clear VM_MERGEABLE when setting PR_SET_MEMORY_MERGE=0 selftests/ksm: ksm_functional_tests: add prctl unmerge test mm/ksm: move disabling KSM from s390/gmap code to KSM code
arch/s390/mm/gmap.c | 20 +----- include/linux/ksm.h | 7 ++ kernel/sys.c | 12 +--- mm/ksm.c | 70 +++++++++++++++++++ .../selftests/mm/ksm_functional_tests.c | 46 ++++++++++-- 5 files changed, 121 insertions(+), 34 deletions(-)