On Thu, Jul 16, 2009 at 11:54:15AM +1000, Benjamin Herrenschmidt wrote: > On Wed, 2009-07-15 at 15:56 +0200, Nick Piggin wrote: > > Interesting arrangement. So are these last level ptes modifieable > > from userspace or something? If not, I wonder if you could manage > > them as another level of pointers with the existing pagetable > > functions? > > I don't understand what you mean. Basically, the TLB contains PMD's. Maybe I don't understand your description correctly. The TLB contains PMDs, but you say the HW still logically performs another translation step using entries in the PMD pages? If I understand that correctly, then generic mm does not actually care and would logically fit better if those entries were "linux ptes". The pte invalidation routines give the virtual address, which you could use to invalidate the TLB. > There's nothing to change to the existing page table layout :-) But > because they appear as large page TLB entries that cover the virtual > space covered by a PMD, they need to be invalidated using virtual > addresses when PMDs are removed. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
