On Mon, 2 Apr 2007, Andi Kleen wrote: > > No no no. For the gazillions time: All of 1-1 mapped kernel memory on > > x86_64 needs a 2 MB page table entry. The virtual memmap uses the same. > > There are *no* additional TLBs used. > > But why do you reserve an own virtual area then if you claim to not use any > additional mappings?
The 1-1 area using mappings for 2MB pages right? So it uses a virtual 1-1 area. It already has a virtual mapping. What we do for virtual memmap here is also use 2MB pages but order the pages a bit different so that they provide a linear memory map. So the number of TLBs in use stays the same. There are a few additional higher level page table pages that are needed to provide the alternate view that generates the linear mapping but that is just a couple of pages. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
