Review request for 5049299

[Andrew Haley]

Martin Buchholz wrote:

> I confess to incomplete understanding of the situation on Linux, but...
> I agree that the limit is artificial,
> in that there is no doubling of actual  memory.
> It's a monitoring problem, whether internal to the linux kernel
> or perhaps some other external software "accounting" entity.
> Nevertheless, I believe this limit prevents a process currently using
> 75% of memory from starting a small subprocess and
> expect that clone() with CLONE_VM will fix that.

AFAIAA that should not happen.  I'd be interested to try a test case.

Andrew.