title: Can we modify limits.h? Would it render any effect?
body: <p>Let's say we want to change the value of maximum number of precesses each uid can execute contemporarily, what if we modify value CHILD_MAX in limits.h.
  Is the value in limits.h just set in order to let us know the 'limits', or we can actually manipulate our system with it?
  I think since kernel is not recompiled, there should be no reason that we can change the system behaviour in such way.</p>