On Wed, Jul 31, 2019 at 02:25:11AM -0600, William Kucharski wrote: > This set of patches is the first step towards a mechanism for automatically > mapping read-only text areas of appropriate size and alignment to THPs > whenever possible. > > For now, the central routine, filemap_huge_fault(), amd various support > routines are only included if the experimental kernel configuration option > > RO_EXEC_FILEMAP_HUGE_FAULT_THP > > is enabled. > > This is because filemap_huge_fault() is dependent upon the > address_space_operations vector readpage() pointing to a routine that will > read and fill an entire large page at a time without poulluting the page > cache with PAGESIZE entries
How is the readpage code supposed to stuff a THP page into a bio? i.e. Do bio's support huge pages, and if not, what is needed to stuff a huge page in a bio chain? Once you can answer that question, you should be able to easily convert the iomap_readpage/iomap_readpage_actor code to support THP pages without having to care about much else as iomap_readpage() is already coded in a way that will iterate IO over the entire THP for you.... Cheers, Dave. -- Dave Chinner [email protected]
