On Thu, 01 Mar 2018 19:49:07 -0800 Dan Williams <dan.j.willi...@intel.com> wrote:
> When device-dax is operating in huge-page mode we want it to behave like > hugetlbfs and report the MMU page mapping size that is being enforced by > the vma. Similar to commit 31383c6865a5 "mm, hugetlbfs: introduce > ->split() to vm_operations_struct" it would be messy to teach > vma_mmu_pagesize() about device-dax page mapping sizes in the same > (hstate) way that hugetlbfs communicates this attribute. Instead, these > patches introduce a new ->pagesize() vm operation. > > ... > > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -383,6 +383,7 @@ struct vm_operations_struct { > int (*huge_fault)(struct vm_fault *vmf, enum page_entry_size pe_size); > void (*map_pages)(struct vm_fault *vmf, > pgoff_t start_pgoff, pgoff_t end_pgoff); > + unsigned long (*pagesize)(struct vm_area_struct * area); fwiw, vm_operations_struct is documented in Documentation/filesystems/Locking. Some bitrotting has occurred :( _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm