Messages in this thread |  | | From | Michael Meskes <> | Subject | Re: the mmap() problem, a'la "grep x /dev/zero" | Date | Thu, 6 Jun 1996 14:26:21 +0200 (MET DST) |
| |
Linus Torvalds writes: > I suspect it's just the fact that Linux doesn't check for memory availability > when doing memory mappings. It _does_ check when increasing the bss, so it > was just a matter of doing that check in both places (the check should > probably be improved too). > > I'm including totally untested patches - I haven't even rebooted (or > compiled) this kernel yet, but the more testers, the merrier. The worst > that can happen is that nothing works, it eats your harddisk, and the > machine goes up in smoke.,. > > (most of this patch is actually just moving "sys_brk()" to where it > belongs) > > Please do tell if this makes a difference for you..
For me there's no different bahaviour at all. I killed the grep when it was clearly over the limit I set.
But for the following program there was a change:
#include <stdio.h> #define K 1024 #define M (1020*K) #define N 128 char a[N*M];
main() { long i;
for(i=0;i<(N*M);i++) a[i]=i%100; }
Instead of killing my machine it dumps core. Not exactly what it should do but better than killing the system :-)
BTW this program is the one my collegue uses to kill my machine from time to time.
Michael
-- Michael Meskes | _____ ________ __ ____ meskes@informatik.rwth-aachen.de | / ___// ____/ // / / __ \___ __________ meskes@sanet.de | \__ \/ /_ / // /_/ /_/ / _ \/ ___/ ___/ meskes@debian.org | ___/ / __/ /__ __/\__, / __/ / (__ ) Use Debian Linux! | /____/_/ /_/ /____/\___/_/ /____/
|  |