Flexible mem= parameter

[Jan Engelhardt]

Hello,


mem= can be used to limit the amount of physical memory Linux uses. I 
presume that when specifying mem=256M only the memory from 0x0 to 
0x10000000 is used. Is there a way to tune mem= so that it will use
0x70000000 to 0x80000000? (A compile-time change would suffice.)


Background: I am trying to track down a nondeterministic (but 
reproducible) segfault while building big projects like gcc or glibc. I do 
not think it's a memory problem since it only showed up since I changed to 
gcc 4.1.0 and tweaked it to use -mcpu=ultrasparc (rather than -mcpu=v7) by 
default. I had been building gcc4 before with gcc3 a number of times w/o 
problems. I did ran a userspace memtester for approx 20 hours (`memtest` 
from debian).


Jan Engelhardt
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