Limit RAM usage

Hi,

I want to limit the amount of actual RAM usage processes can use. The /
etc/security/limits.conf (or the ulimit command) offer several memory
limits: data, stack, as and rss.

"data" and "stack" seem not to be comprehensive enough, processes can
still use much more RAM even than the sum of both. On the other hand,
limiting "as" is sometimes too strict, as processes might use more
virtual than real memory (I suppose e.g. when using file mapping). So
"rss" seems the right setting, but that simply has no effect, which is
consistent with the comment in the man page: "Ignored in Linux 2.4.30
and higher"

So how can I actually implement a limit on the real amount of RAM (on
a 2.6 kernel of course...)?

Cheers and thanks in advance,
Martin
.

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