On Wed, 2007-11-14 at 10:26 +0100, Martin Schwidefsky wrote: > That patch allows processes to have different number of page table > levels, 31 bit processes have 2 levels (2GB), normal 64 bit processes > have 3 levels (4TB) and really big 64 bit processes can have 4 levels > (8PB). The downgrade of a page table to use less levels than the > parent > process is done in arch_pick_mmap_layout. The upgrade is done by using > the arch_rebalance_pgtables call. I've considered using the > arch_get_unmapped_area but got scared by the indirection in > get_unmapped_area: > > get_area = current->mm->get_unmapped_area; > if (file && file->f_op && file->f_op->get_unmapped_area) > get_area = file->f_op->get_unmapped_area; > addr = get_area(file, addr, len, pgoff, flags); Don't be, it's really only hugetlb and other arch specific stuff that hook in here on platforms with an MMU (It's also used by /dev/mem etc... for mmu-less platforms but you don't care). Ben. - 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
