On 06/15/2012 09:12 PM, Jeff Weber wrote:
> I occasionally run across net lore which recommends "pre-faulting" a stack.
> For example:
> https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO#A_Realtime_.22Hello_World.22_Example
>
> From my understanding of mlockall(MCL_CURRENT|MCL_FUTURE), all process
> memory is paged and locked in. Thus, a pre-faulting exercise appears
> useless.
> (I don't care about the main() thread.) Can you confirm?
Last time I checked, only the main thread stack was grown on demand, so
required pre-faulting the stack, which is why xenomai takes care of
pre-faulting the main thread stack.
To verify this, you have to check /proc/self/maps. If the thread stack
belongs to a mapping of a size you would not expect, try writing below
the limit, to see if you get a fault, or if the mapping grows in
/proc/self/maps.
--
Gilles.
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