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 KXGtH4xj 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4:23 PM Anthony Yznaga >> wrote: >>> >>> From: Khalid Aziz >>> >>> Add a bit to vm_flags to indicate a vma shares PTEs with others. Add >>> a function to determine if a vma shares PTEs by checking this flag. >>> This is to be used to find the shared page table entries on page fault >>> for vmas sharing PTEs. >>> >>> Signed-off-by: Khalid Aziz >>> Signed-off-by: Matthew Wilcox (Oracle) >>> Signed-off-by: Anthony Yznaga >>> --- >>>   include/linux/mm.h             | 7 +++++++ >>>   include/trace/events/mmflags.h | 3 +++ >>>   mm/internal.h                  | 5 +++++ >>>   3 files changed, 15 insertions(+) >>> >>> diff --git a/include/linux/mm.h b/include/linux/mm.h >>> index 6549d0979b28..3aa0b3322284 100644 >>> --- a/include/linux/mm.h >>> +++ b/include/linux/mm.h >>> @@ -413,6 +413,13 @@ extern unsigned int kobjsize(const void *objp); >>>   #define VM_DROPPABLE           VM_NONE >>>   #endif >>> >>> +#ifdef CONFIG_64BIT >>> +#define VM_SHARED_PT_BIT       41 >>> +#define VM_SHARED_PT           BIT(VM_SHARED_PT_BIT) >>> +#else >>> +#define VM_SHARED_PT           VM_NONE >>> +#endif >>> + >>>   #ifdef CONFIG_64BIT >>>   /* VM is sealed, in vm_flags */ >>>   #define VM_SEALED      _BITUL(63) >>> diff --git a/include/trace/events/mmflags.h >>> b/include/trace/events/mmflags.h >>> index b63d211bd141..e1ae1e60d086 100644 >>> --- a/include/trace/events/mmflags.h >>> +++ b/include/trace/events/mmflags.h >>> @@ -167,8 +167,10 @@ IF_HAVE_PG_ARCH_X(arch_3) >>> >>>   #ifdef CONFIG_64BIT >>>   # define IF_HAVE_VM_DROPPABLE(flag, name) {flag, name}, >>> +# define IF_HAVE_VM_SHARED_PT(flag, name) {flag, name}, >>>   #else >>>   # define IF_HAVE_VM_DROPPABLE(flag, name) >>> +# define IF_HAVE_VM_SHARED_PT(flag, name) >>>   #endif >>> >>>   #define __def_vmaflag_names \ >>> @@ -204,6 +206,7 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, >>> "softdirty"     )               \ >>>          {VM_HUGEPAGE,                   "hugepage" },              \ >>>          {VM_NOHUGEPAGE,                 "nohugepage" },              \ >>>   IF_HAVE_VM_DROPPABLE(VM_DROPPABLE,     "droppable" )               \ >>> +IF_HAVE_VM_SHARED_PT(VM_SHARED_PT,     "sharedpt" )               \ >>>          {VM_MERGEABLE,                  "mergeable" }               \ >>> >>>   #define show_vma_flags(flags) \ >>> diff --git a/mm/internal.h b/mm/internal.h >>> index b4d86436565b..8005d5956b6e 100644 >>> --- a/mm/internal.h >>> +++ b/mm/internal.h >>> @@ -1578,4 +1578,9 @@ void unlink_file_vma_batch_init(struct >>> unlink_vma_file_batch *); >>>   void unlink_file_vma_batch_add(struct unlink_vma_file_batch *, >>> struct vm_area_struct *); >>>   void unlink_file_vma_batch_final(struct unlink_vma_file_batch *); >>> >> >> Hi Anthony, >> >> I'm really excited to see this series on the mailing list again! :) I >> won't have time to review this series in too much detail, but I hope >> something like it gets merged eventually. >> >>> +static inline bool vma_is_shared(const struct vm_area_struct *vma) >>> +{ >>> +       return VM_SHARED_PT && (vma->vm_flags & VM_SHARED_PT); >>> +} >> >> Tiny comment - I find vma_is_shared() to be a bit of a confusing name, >> especially given how vma_is_shared_maywrite() is defined. (Sorry if >> this has already been discussed before.) >> >> How about vma_is_shared_pt()? > > vma_is_mshare() ? ;) vma_is_vmas()? :-D > > The whole "shared PT / shared PTE" is a bit misleading IMHO and a bit > too dominant in the series. Yes, we're sharing PTEs/page tables, but > the main point is that a single mshare VMA might cover multiple > different VMAs (in a different process). > > I would describe mshare VMAs as being something that shares page > tables with another MM, BUT, also that the VMA is a container and what > exactly the *actual* VMAs in there are (including holes), only the > owner knows. > > E.g., is_vm_hugetlb_page() might be *false* for an mshare VMA, but > there might be hugetlb folios mapped into the page tables, described > by a is_vm_hugetlb_page() VMA in the owner MM. > > So again, it's not just "sharing page tables". Understood. I'm okay with something like vma_is_mshare() or some other shorthand for a "container" VMA. And I recognize that I need to identify which code paths need to be enlightened to container VMAs and which should expect to be operating on a real VMA or don't care. Anthony