Messages in this thread | | | From | Marvin Justice <> | Subject | Re: [PATCH] 1-2-3 GB | Date | Sun, 13 Jan 2002 17:11:58 -0600 |
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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.
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