Messages in this thread |  | | Date | Thu, 9 Nov 2000 16:36:59 +0000 (GMT) | From | Tigran Aivazian <> | Subject | Re: is there a limit on bss size? |
| |
On Fri, 6 Oct 2000, Philipp Rumpf wrote:
> On Fri, Oct 06, 2000 at 12:32:35PM +0300, Petko Manolov wrote: > > It is not so difficult as it looks. > > I don't see it being difficult at all ... > > > The master pgd looking as: > > > > .org 0x1000 > > ENTRY(swapper_pg_dir) > > .long 0x00102007 > > .long 0x00103007 > > .fill BOOT_USER_PGD_PTRS-2,4,0 > > /* default: 766 entries */ > > .long 0x00102007 > > .long 0x00103007 > > /* default: 254 entries */ > > .fill BOOT_KERNEL_PGD_PTRS-2,4,0 > > > > > > should become: > > > > > > .org 0x1000 > > ENTRY(swapper_pg_dir) > > .long 0x00102007 > > .long 0x00103007 > > .... # every entry addresses 4 MB exactly > > .... # so add as much as you want > > .long 0x0010X007 > > .fill BOOT_USER_PGD_PTRS-X+2,4,0 > > I'm unconvinced we need to map more than 4 MB into low virtual addresses; > nothing seems to break with > > ENTRY(swapper_pg_dir) > .long 0x00102007 > .fill BOOT_USER_PGD_PTRS-1,4,0 >
Hi Phillip,
Ah, _now_ I understand what you are talking about (took me only slightly over a month ;) and so can answer -- try making a huge bzImage (a few megs) and boot with it. That was the main reason Werner added the extra stuff somewhere around 2.3.99-preX.
Having said that, I still don't see why we actually need a specific label (like pg1) for each successive page worth of pte's if we are filling them with data starting from pg0 until we hit empty_zero_page (as I asked in my other message).
Regards, Tigran
PS. I cc'd the guy who was looking to extend the page tables for booting with huge bss also...
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |