On Tue, 2019-06-11 at 10:55 -0700, Dave Hansen wrote: > On 6/6/19 1:06 PM, Yu-cheng Yu wrote: > > --- a/mm/mmap.c > > +++ b/mm/mmap.c > > @@ -1703,6 +1703,9 @@ static inline int accountable_mapping(struct file > > *file, vm_flags_t vm_flags) > > if (file && is_file_hugepages(file)) > > return 0; > > > > + if (arch_copy_pte_mapping(vm_flags)) > > + return 1; > > + > > return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == > > VM_WRITE; > > } > > > > @@ -3319,6 +3322,8 @@ void vm_stat_account(struct mm_struct *mm, vm_flags_t > > flags, long npages) > > mm->stack_vm += npages; > > else if (is_data_mapping(flags)) > > mm->data_vm += npages; > > + else if (arch_copy_pte_mapping(flags)) > > + mm->data_vm += npages; > > } > > This classifies shadow stack as data instead of stack. That seems a wee > bit counterintuitive. Why did you make this choice?
I don't recall the reason; I will change it to stack and test it out. Yu-cheng
