is VM_GROWSDOWN still useful

[castet . matthieu]

Hi,

I am wondering if the flags GROWSDOWN/GROWSUP is still useful on linux today. It
is only used for the main thread stack.
Stack allocated by pthread doesn't use anymore GROWSDOWN because you can't
guaranty that a user mapping (via mmap) will collide with it.

Why not doing the same for the main thread : allocate a stack of the rlimit size
?

Linux memory allocation use over-commit, and physical memory will only be
allocated when the stack is really used.

Or are they real usage of GROWSDOWN ?

Matthieu
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