lkml.org 
[lkml]   [2002]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] 1-2-3 GB
Date
On Sunday 13 January 2002 02:24 pm, H. Peter Anvin wrote:
> By the way, expect user programs to fail due to lack of address space
> if you only give them 1 GB of userspace. At 1 GB of userspace there
> is *no* address space which is compatible with the normal address
> space map available to the user process.


Actually, I think it will work for apps < `600MB since the mmap area is
automatically adjusted to begin at PAGE_OFFSET/3.

cat /proc/1/maps

CONFIG_1GB
08048000-0804e000 r-xp 00000000 03:41 58716 /sbin/init
0804e000-08050000 rw-p 00005000 03:41 58716 /sbin/init
08050000-08054000 rwxp 00000000 00:00 0
40000000-40016000 r-xp 00000000 03:41 73822 /lib/ld-2.2.4.so
40016000-40017000 rw-p 00015000 03:41 73822 /lib/ld-2.2.4.so
40017000-40018000 rw-p 00000000 00:00 0
4002c000-4015e000 r-xp 00000000 03:41 73816 /lib/i686/libc-2.2.4.so
4015e000-40164000 rw-p 00131000 03:41 73816 /lib/i686/libc-2.2.4.so
40164000-40168000 rw-p 00000000 00:00 0
bfffe000-c0000000 rwxp fffff000 00:00 0

CONFIG_3GB
08048000-0804e000 r-xp 00000000 03:41 58716 /sbin/init
0804e000-08050000 rw-p 00005000 03:41 58716 /sbin/init
08050000-08054000 rwxp 00000000 00:00 0
15556000-1556c000 r-xp 00000000 03:41 73822 /lib/ld-2.2.4.so
1556c000-1556d000 rw-p 00015000 03:41 73822 /lib/ld-2.2.4.so
1556d000-1556e000 rw-p 00000000 00:00 0
15582000-156b4000 r-xp 00000000 03:41 73816 /lib/i686/libc-2.2.4.so
156b4000-156ba000 rw-p 00131000 03:41 73816 /lib/i686/libc-2.2.4.so
156ba000-156be000 rw-p 00000000 00:00 0
3fffe000-40000000 rwxp fffff000 00:00 0

Then again, I agree the 3GB option doesn't make much sense for 99.99% of
cases.

-Marvin
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:15    [W:0.220 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site