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Tue, 3 Sep 2024 23:58:10 +0000 Received: from MW6PR10MB7660.namprd10.prod.outlook.com ([fe80::41fa:92d3:28b9:2a15]) by MW6PR10MB7660.namprd10.prod.outlook.com ([fe80::41fa:92d3:28b9:2a15%4]) with mapi id 15.20.7918.024; Tue, 3 Sep 2024 23:58:10 +0000 Message-ID: Date: Tue, 3 Sep 2024 16:58:02 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v3 06/10] mm/mshare: Add vm flag for shared PTEs To: James Houghton Cc: akpm@linux-foundation.org, willy@infradead.org, markhemm@googlemail.com, viro@zeniv.linux.org.uk, david@redhat.com, khalid@kernel.org, andreyknvl@gmail.com, dave.hansen@intel.com, luto@kernel.org, brauner@kernel.org, arnd@arndb.de, ebiederm@xmission.com, catalin.marinas@arm.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhiramat@kernel.org, rostedt@goodmis.org, vasily.averin@linux.dev, xhao@linux.alibaba.com, pcc@google.com, neilb@suse.de, maz@kernel.org References: <20240903232241.43995-1-anthony.yznaga@oracle.com> <20240903232241.43995-7-anthony.yznaga@oracle.com> Content-Language: en-US From: Anthony Yznaga In-Reply-To: Content-Type: text/plain; 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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