On Thu, 27 Feb 2014 21:53:46 +0200 "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > The patch introduces new vm_ops callback ->map_pages() and uses it for > mapping easy accessible pages around fault address. > > On read page fault, if filesystem provides ->map_pages(), we try to map > up to FAULT_AROUND_PAGES pages around page fault address in hope to > reduce number of minor page faults. > > We call ->map_pages first and use ->fault() as fallback if page by the > offset is not ready to be mapped (cold page cache or something). > > ... > > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > > ... > > @@ -571,6 +576,9 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) > pte = pte_mkwrite(pte); > return pte; > } > + > +void do_set_pte(struct vm_area_struct *vma, unsigned long address, > + struct page *page, pte_t *pte, bool write, bool anon); > #endif > > /* lguest made a dubious naming decision: drivers/lguest/page_tables.c:890: error: conflicting types for 'do_set_pte' include/linux/mm.h:593: note: previous declaration of 'do_set_pte' was here I'll rename lguest's do_set_pte() to do_guest_set_pte() as a preparatory patch. btw, do_set_pte() could really do with some documentation. It's not a trivial function and it does a lot of stuff. It's exported to other compilation units and we should explain the what, the why and particularly the locking preconditions. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>