On Fri, Mar 18, 2016 at 07:23:41PM +0530, Aneesh Kumar K.V wrote: > "Kirill A. Shutemov" <kirill.shute...@linux.intel.com> writes: > > > [ text/plain ] > > split_huge_pmd() for file mappings (and DAX too) is implemented by just > > clearing pmd entry as we can re-fill this area from page cache on pte > > level later. > > > > This means we don't need deposit page tables when file THP is mapped. > > Therefore we shouldn't try to withdraw a page table on zap_huge_pmd() > > file THP PMD. > > Archs like ppc64 use deposited page table to track the hardware page > table slot information. We probably may want to add hooks which arch can > use to achieve the same even with file THP
Could you describe more on what kind of information you're talking about? -- Kirill A. Shutemov
