On Tue, 2023-09-19 at 13:51 -0700, Stefan Roesch wrote: > A process can enable KSM with the prctl system call. When the process > is > forked the KSM flag is inherited by the child process. However if the > process is executing an exec system call directly after the fork, the > KSM setting is cleared. This patch addresses this problem. > > Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx> > Reported-by: Carl Klemm <carl@xxxxxxxx> > --- > include/linux/sched/coredump.h | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/include/linux/sched/coredump.h > b/include/linux/sched/coredump.h > index 0ee96ea7a0e9..205aa9917394 100644 > --- a/include/linux/sched/coredump.h > +++ b/include/linux/sched/coredump.h > @@ -87,8 +87,11 @@ static inline int get_dumpable(struct mm_struct > *mm) > > #define MMF_DISABLE_THP_MASK (1 << MMF_DISABLE_THP) > > +#define MMF_VM_MERGE_ANY 29 > +#define MMF_VM_MERGE_ANY_MASK (1 << MMF_VM_MERGE_ANY) > + > #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | > MMF_DUMP_FILTER_MASK |\ > - MMF_DISABLE_THP_MASK | > MMF_HAS_MDWE_MASK) > + MMF_DISABLE_THP_MASK | > MMF_HAS_MDWE_MASK |\ > + MMF_VM_MERGE_ANY_MASK) > > -#define MMF_VM_MERGE_ANY 29 > #endif /* _LINUX_SCHED_COREDUMP_H */ I can confirm that this patch works as intended for my usecase, you can have my: Tested-by: Carl Klemm <carl@xxxxxxxx>
