Re: [PATCH 4/5] Add a sysconf syscall
From: Andi Kleen
Date: Mon May 16 2011 - 12:08:15 EST
> You could also add a vsyscall function and have that function pull the
> values from vvar data. It would be very fast (i.e. almost as fast as
> mmaping some data) and it would be more portable.
vvar is a global. The variable data in sysconf is per thread
(and not even per mm)
Even if you ignore the semantic problem of thread versus mm, you would
need a new writable page per process and update it any time
the rlimits and other information is updated.
On the other hand my solution is dead simple and already solves
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