On 09/04/2015 01:34 PM, Florian Weimer wrote:
...>>> It will also be very painful to add additional bits.  We went through
>>> this with the CPU affinity mask, and it still hurts it.  Please use a
>>> more sensible interface from the start. :)
>>
>> Any suggestions?
> 
> It's difficult.  I don't know what kind of programming model you
> expect.  Could glibc use these bits for its own implementation?  Or
> OpenSSL?

Our expectation is that there will be a central "allocator" for these
bits for mixed-use, like when two libraries want to control a portion of
the address space for their purposes.

Applications will also be completely free to implement their own, like
with a language runtime.
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