* is VM_GROWSDOWN still useful
@ 2010-08-21 15:58 castet.matthieu
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From: castet.matthieu @ 2010-08-21 15:58 UTC (permalink / raw)
To: linux-kernel
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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