On Wed, Oct 10, 2012 at 08:49:05AM -0700, Yinghai Lu wrote: > On Wed, Oct 10, 2012 at 7:17 AM, Konrad Rzeszutek Wilk > <kon...@kernel.org> wrote: > > On Tue, Oct 09, 2012 at 06:03:33PM -0700, Yinghai Lu wrote: > > >> good point, i add one line comment to the revised patch. > >> > >> +/* need 3 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */ > > > > Can you explain the math please? It sounds like this is based on > > the assumption that this you are using huge pages. But what if you > > are not? What if you can only do 4KB pages? > > yes that is some extreme case: > assume that 2M range is [2T-2M, 2T),
What is T in here? Terabyte? Is the '[' vs ')' a significance in your explanation? Should it be '[2T-2M, 2T]' ? > one page for PGD-[2T-512g, 2T), one for PUD - [2T-1G, 2T), and one for > PMD -: [2T-2M, 2T) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/