is there a limit on bss size?
A message that is not in the archive (sent off-list or not yet received): [email protected]
Quoted 31 lines · Philipp Rumpf
Quoted 1 line · Petko Manolov
It is not so difficult as it looks.
I don't see it being difficult at all ...
Quoted 17 lines
The master pgd looking as:
.org
0x1000ENTRY(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-2,4,0should become:
Quoted 8 lines
.org
0x1000ENTRY(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
Quoted 7 lines
I'm unconvinced we need to map more than 4 MB into low virtual addresses; nothing seems to break with
ENTRY(swapper_pg_dir)
.long0x00102007.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 [email protected]
Please read the FAQ at http://www.tux.org/lkml/