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 HAgOdbfn 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/3/24 4:40 PM, James Houghton wrote: > On Tue, Sep 3, 2024 at 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 James, > 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. Me, too. :-) > >> +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()? Good point. I'll make this change. Thanks for taking a look. Anthony