> 
> Maybe it would be good to lower the default threads-max to 
> about 10% or less of physical memory ? 
>

And MIN_THREADS_FOR_ROOT should be reintroduced: the define is still
there, but the actual code is missing.

I've attached an older patch that:
* reintroduces MIN_THREADS_FOR_ROOT (or remove the define)
* adds lower and upper bounds for /proc/sys/kernel/threads-max.
* bugfixes for get_pid(). This is the longest part of the patch, but
it's only necessary if you have more than 10.000 threads running. If you
have enough memory: launch a forkbomb. If ~ 32760 thread are running the
kernel enters an endless loop in get_pid() (or around 11000 threads if
they intentionally create additional sessions and process groups)

I tested the patch with 2.4.0-test12, but not with newer kernels.

--
	Manfred